[JoeF]

Edit time ran out.
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Motivation resulting in Joe Cup comes from wanting to avoid clamps, holes in tube segments, shear-pins, shear-pin holes, cam-expanding devices, threads, swaging, and more. Some of these avoids reduce the tote-tiny-packing of telescopic tubing by stopping nesting of tube segments.

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CAUTION, THE FOLLOWING AI TEXT MIGHT HAVE ERRORS IN IT:

Can a group of 20 people train ChatGPT to do designing of tiny-packed hang gliders very well?
ChatGPT
No, a group of 20 people cannot train ChatGPT to do designing of tiny-packed hang gliders very well.

ChatGPT is a pre-trained language model that has been trained on a large corpus of text data, but it does not have the ability to learn new skills or perform specific tasks without additional training. Designing tiny-packed hang gliders requires expertise in engineering, physics, and aerodynamics, which is beyond the scope of what ChatGPT has been trained to do.

Moreover, even if the group of 20 people had the expertise to train ChatGPT in this domain, it would require a significant amount of specialized training data and a well-designed training process to achieve high levels of proficiency. Therefore, it would be more efficient and effective to hire or consult with a professional designer with experience in this specific area.

Some further fallible AI response to a question:

User
What are some ways to design a removable bushing that limits the overlap in two telescoping tubes that will be used under axial compression? Have it that the device is removable so that transport packing of the telescopic tubes can use full nesting of the telescoping tube segments.
ChatGPT
There are several ways to design a removable bushing that limits the overlap in two telescoping tubes that will be used under axial compression. Here are some possible approaches:

External bushing: One approach is to design an external bushing that fits over the smaller tube and prevents it from sliding too far into the larger tube. The bushing could be made of a strong and durable material such as metal or plastic, and could be secured to the smaller tube with screws or other fasteners. This design would allow the bushing to be easily removed when the tubes need to be packed for transport.

Internal bushing: Another approach is to design an internal bushing that fits inside the larger tube and limits the overlap of the smaller tube. The bushing could be made of a material that is strong enough to withstand the compressive forces, and could be secured to the larger tube with adhesive or other means. This design would also allow the bushing to be easily removed for transport.

Pin and groove: A third approach is to design a pin and groove system that limits the overlap of the two tubes. The smaller tube could have a groove or slot cut into it, and the larger tube could have a pin or protrusion that fits into the groove. This would prevent the smaller tube from sliding too far into the larger tube. The pin and groove system could be designed to be easily removable for transport.

Spring-loaded clip: A fourth approach is to design a spring-loaded clip that fits over the smaller tube and prevents it from sliding too far into the larger tube. The clip could be designed to apply pressure to the smaller tube, keeping it in place while under compression. The clip could be easily removed for transport.

These are just a few possible approaches to designing a removable bushing that limits the overlap in two telescoping tubes under axial compression. The final design would depend on various factors, such as the materials being used, the size and weight of the tubes, and the specific requirements for transport packing. It's important to thoroughly test and validate any design to ensure that it meets the necessary performance and safety requirements.

In further conversation with ChatGPT on the matter, see the fallible response to my question:

User
What about a Joe Cup that is a bushing that is external and internal at the same time; a bushing that is flanged out at the top and flanged in at the bottom; the external top flange is pressed against the external telescopic tube when the internal flange is pushed by the small telescopic tube end; this puts the bushing in tension when the two telescopic tube segments are in axial compression.

ChatGPT
The Joe Cup design you described could work as a removable bushing that limits the overlap in two telescoping tubes under axial compression, as long as it is designed and manufactured correctly.

The flanged-out top of the Joe Cup could be pressed against the external telescopic tube to limit the overlap, while the flanged-in bottom could fit inside the larger telescopic tube to provide additional support. When the smaller telescopic tube is inserted into the larger one, it would push against the internal flange of the Joe Cup, causing the external flange to be pressed against the external telescopic tube. This would create tension in the Joe Cup, which would help to keep the telescoping tubes in place under axial compression.

It's important to ensure that the materials used for the Joe Cup are strong and durable enough to withstand the compressive forces and any other stresses that may be placed on it. The design should also be thoroughly tested to ensure that it meets any necessary safety and performance requirements.

Overall, the Joe Cup design you described could be a viable solution for a removable bushing that limits the overlap in two telescoping tubes while still allowing for full nesting of the telescoping tube segments during transport packing.

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A retrace on same question to fallible AI:

User
What about a Joe Cup that is a bushing that is external and internal at the same time; a bushing that is flanged out at the top and flanged in at the bottom; the external top flange is pressed against the external telescopic tube when the internal flange is pushed by the small telescopic tube end; this puts the bushing in tension when the two telescopic tube segments are in axial compression.
ChatGPT

2 / 2

The Joe Cup design that you described sounds like a possible solution for limiting the overlap in two telescoping tubes under axial compression. By having an external flange at the top and an internal flange at the bottom, the Joe Cup bushing could effectively limit the overlap of the two tubes, while still allowing for easy removal for transport.

When the two telescoping tube segments are compressed, the internal flange of the Joe Cup would be pushed upward by the smaller telescopic tube end, which would in turn push the external top flange of the Joe Cup against the external telescopic tube. This would create tension in the Joe Cup bushing, which would help to prevent the smaller tube from sliding too far into the larger tube.

It's important to note that any design for a removable bushing in telescoping tubes should be thoroughly tested and validated to ensure that it meets the necessary performance and safety requirements. The Joe Cup design could work well in certain applications, but other factors such as the materials being used, the size and weight of the tubes, and the specific requirements for transport packing should also be taken into consideration when designing a bushing for telescoping tubes.

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Conversing with ChatGPT, I asked about Teflon sleeving:

User
Are there Teflon sleeves to fill the gaps that occur in the overlap of telescopic tubes?
ChatGPT
Yes, Teflon sleeves can be used to fill the gaps that occur in the overlap of telescopic tubes. These sleeves are typically made from a thin, flexible sheet of Teflon (a type of fluoropolymer) and are designed to be wrapped around the smaller tube before it is inserted into the larger tube.

The Teflon sleeve helps to fill any gaps or irregularities in the overlap between the two tubes, creating a smoother and more even surface for the tubes to slide against. This can help to reduce friction and wear between the tubes, as well as improve the overall stability and strength of the telescopic assembly.

Teflon sleeves are often used in applications where precise movement or positioning is required, such as in telescoping camera tripods or extension poles for painting and cleaning. They can also be used in other types of mechanical assemblies where two or more tubes need to slide smoothly against each other, such as in pneumatic cylinders or hydraulic rams.

[dhmartens]

Once compromised I found out how they do it.

[JoeF]

Option to make a Joe Cup from a flanged sleeve bearing: well bond a disk to the inside bottom of the COTS flanged sleeve bearing. might be that the bearing shaft is not long enough. First opinion: COTS won't supply well for targets wanted.
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Option: Start with a segment of tubing. Flange the top of the tubing by some method. Bond a plug to the inside bottom of the tubing segment. Presto: a Joe Cup. Test such DIY Joe Cup thoroughly for the target application. Note: a mod here could be a Joe Cup with a slit allowing some springy size changing to allow for some variation in fitting.
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NeedsModSinkStrainerPossibleJoeCup.jpg (31.07 KiB) Viewed 853 times

[JoeF]

Well, a night's sleep cut short with some advance over variation of a Joe Cup:
The following seems to face the challenge of wedging, variable tube sizes, upper flange-making ...
Here is the Joe Cup that awakened me this May 1, Monday morning:
Have a strip of ribbon steel or titanium in the hem of a sock. Stuff the sock into the cavity of the larger tube segment of a telescopic twosome before inserting the inner telescoping tube. Then handily press the hemmed steel or titanium ribbon on the outside upper edge of the tube; set the hemmed arrangement with a wrap of hook-and loop tape. Insert the small telescoping tube into the socked cavity of the larger or base telescopic tube. Put the macro spar into axial compression. The sock tightens in tension and tries to pull the top of the hemmed steel or titanium ribbon, but is resisted severely because of the wrap or strap and geometry of the metal ribbon's orientation; the pull tends to squeeze the top of the base tube's end which is a helpful matter helping to firm the limit position of the smaller tube's insertion. There is no wedging at the gap of the two tubes, but the opposite.... a tendency to bind. At disassembly, just put the telescopic tubes apart, release the hook-and-loop wrap, let the sock fill the short cavity of the ringed metal ribbon (or if ribbon is split and an opening in the hem of the sock is afforded, then ribbon can go fully flat with stock for highly efficient toted packing. Such a Joe Cup could meet variations of tube diameters. Instead of a metal hose clamp, have the hook-and-loop wrap strap. Maybe polycarbonate strip would do instead of ribbon steel or ribbon titanium. This Joe Cup mode needs to tested for failure modes. Again as posted earlier: a loose radiused-bottom-edge disk may be placed at the bottom of the sock to receive the inserted end of the smaller telescoped tube. Such repeated for a series of telescoping tubes could make up a one-way or doubly-tapered telescopic HG spar ready to face axial compression.

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A non-Joe-Cup alternative that brings full nesting of telescopic tubes during tote:
An alternative is to hose clamp a sock edge with a small wire at the extreme edge of the socks hem. The hemmed wire cannot creep beneath the hose clamp. Have the sock's edge hem saturated with silicon to advance grip as hose clamp is tightened. Test this variation thoroughly before using. For packing and tote: loosen clamp and remove sock with its hemmed wire; press all in packable wad.

Another alternative: External headed shear nub taped in place. Tape may be hook-and-loop wrap or sacrificial adhesive tape. Have matching holes in the two telescopic tubes; align the holes, place the headed shear nub; tape over the head of the shear nub so the nub does not fall out. Test this for failure mode under the intended axial compression of the macro spar made up of several telescopic tube segments. Part of the cons for this arrangement: holes in fiberglass or CFRP tube and precision matching of hole with shear nub. Shear pin into two holes is an alternative. Consider weights of the pins, wear at the holes, ...

[Chris McKeon]

I just got off the Phone, I called John to ask Him about being able to break down a Glider. I said to John I like just about about every other Pilot Who Flies XC routes. Well I would tend to Push it regarding Flying an XC route. Heck I recall getting so low that I could see Birds perched up on Tree Limbs. Yes I was somehow able to work a Thermal that I had stumbled across. Yes I have gotten quite low while Flying XC. But I always was able to by Hook or by Crook, I always was able to land By a road. John pouinte4d out to Me that in Breaking down a Predator. That Tube lengths would be a Problem.

But I said before in a previous post. The Idea that a Pilot could Break Down His or Hers Predator, then Back-Pack it out of NO-Man's land sounds interesting.

The way I see it is like this: The Day will come when I will not be able to scratch My way back up. There I will be not being able to Climb, I will be forced to do that horrible Four letter Word. I will have to land.

Bob OK, I realize that I used a Foul Four letter Cuss Word; LAND. But please do not Ban Me.

[JoeF]

Chris, yes, length of spars and their packing challenge is a high focus regarding tiny packing of HGs.
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May 2, 2023, 4:11 a.m. awakened to:
Simple Joe Cup: two loops: one is a ring, one is a loop of ribbon. The two parts tote loose and separate from one another. To use in assembly of telescopic tube segments: put the ring at cross and inside the ribbon loop; then invaginate the ribbon on one side so the ribbon meets the opposite side of the ribbon; this captures the ring. Set the captured ring on the end of the large segment of spar tube; let the ribbon that is now double walled droop inside the large tube segment. Insert the telescoping smaller tube segment, perhaps with two gap-filling flat strips of Teflon sheets lightly sacrificially taped to the smaller tube.

The two gap filling Teflon strips will tote flat and separate from other parts. The tube gaps will freely allow tote nesting-of efficiency for many of the telescopic tube segments that make up macro spars.

Notice that the ribbon loop that droops to double-wall allows wear to be shared from session to session; simply let the ribbon randomly rotate to a different fold position from flight session to flight session. A mark could even be used to assure change so that wear on the ribbon occurs eventually over all the ribbon.

The ribbon loop might be made of flattish Dyneema, perhaps a flattish collection of threads or strings of Dyneema; the main working parts of the ribbon are the longitudinal fibers. Maybe light silicon bonding of Dyneema strings side-by-side would do. COTS ribbons for strapping might do. Take long flat ribbon; cut a segment. Sew closed to a loop. But this method puts a double walling in one small area of the ribbon. To avoid the lump one might use two segments forming two loops and sew or bond the full length of the two married loops. Or one might wrap a loop using one very long string to form one ribbon; bind the wrap with embedding silicon perhaps. The challenge of avoiding a portion of the loop that is with overlap bump occurs as one wants to avoid a bump in the tube gap which would cause problems. The ability to rotate the ribbon for sharing wear is challenged if one has a bump in the ribbon loop. Ribbon loop part could be replaced if wear is too much.

.... exploring Dyneema strapping, Dyneema chaffing sleeve, Dyneema string, Dyneema ribbon, Dyneema webbing, polypropylene webbing...
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The following is distinct from the above:
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In some instances the following, perhaps most simple single-walled Joe Cup mod could be used (test, test, test): take a segment of Dyneema webbing or ribbon (or the like). At each end of the ribbon or strip: fold the end over once or twice of three times to get an end bump; sew and saturate with silicon (perhaps) that little end roll. Presto: a mod Joe Cup. Let the mid part of the strip dip into the large of two telescoping tubes and keep the two end bumps outside the end of the tube segment; insert the smaller of the telescoping tub segments into the large tube segment pressing the mod Joe Cup strip inward. The mod Joe Cup will limit the distance of the insertion. Design lengths of the mod Joe Cup so that the desired insertion limit is obtained. 0=================0 might be a representation in typed characters of the simple mod Joe Cup for use in handling the series of joined telescoping tubes to make up a macro spar for a tiny-packed hang glider that has the spar in axial compression. Two such mod Joe Cups could be used at one station; place the second one at 90 degrees from the first one. Upon use, the overlap crossing of the two mod Joe Cups at the deep inside point does not bother anything during assembled posture and flight. Gap fillers may not be needed when two mod Joe Cups are used. In some instances three mod Joe Cups could be used at one station, or four. Note that this mod has a single wall to the mod Joe Cup; the ribbon or webbing does not overlap itself in the inserted large section.

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If there is insufficient gap in the meshing telescoping tubes then clamping or expansive tactics or shear pins could firm positions of telescoping tubes. An interest in the tiny-packing realm is the keeping of tube segments during tote able to well nest.

[JoeF]

Suggestive of simple Joe Cup via prior post

EndstopSingleRibbonBase001.jpg (12.32 KiB) Viewed 822 times

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A chat with ChatGPT, a language model AI:

User
what might be a good term in mechanical engineering for the following: ribbon segment having the two ends where the ends are folded over some and sewn to keep the end folds. Thus, the ends of the ribbon segment are thicker than the mid long part of the ribbon. Thanks.

ChatGPT
One possible term that might describe the ribbon segment you are referring to is "folded and sewn ribbon end," or simply "folded ribbon end." This term accurately describes the physical characteristics of the ribbon, with the two ends being thicker than the midsection due to the folds and sewing. Another possible term could be "reinforced ribbon end," as the folded and sewn ends provide additional strength and durability to the ribbon.

User
One use of such a part: thick ends of the ribbon stay outside of a base telescopic tube while the midsection of the ribbon goes inside the base telescopic tube to provide a limiting device for a smaller telescopic tube insertion; the ribbon midsection fills the gap between the inside of the base tube and the outside of the inserted telescopic tube.

ChatGPT
Based on your description, a possible term for the ribbon segment you are referring to could be a "telescopic tube limit strap," "limiting strap," or "telescopic tube stopper." These terms describe the function of the ribbon segment in limiting the insertion of a smaller telescopic tube into the base tube. The folded and sewn ends of the ribbon also provide a means for securely attaching the strap to the base tube, while the midsection of the ribbon fills the gap and provides a snug fit for the inserted telescopic tube.
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User
The thickened ends of the ribbon part will not fit into the gap between the inserted tube and the base tube; so, the special limiting strap or telescopic tube stopper need not be connected to the base tube; the thickened part of telescopic tube stopper will stay outside of the small tube's surface and atop the end of the base tube when the overall resulting beam of two telescopic tubes are in axial compression.

ChatGPT
Thank you for the additional clarification. Based on your updated description, a possible term for the ribbon segment you are referring to could be a "telescopic tube end cap" or "tube end stopper." These terms accurately describe the function of the ribbon segment as a cap or stopper for the end of the base tube, preventing the smaller telescopic tube from being inserted too far. The folded and sewn ends of the ribbon provide additional thickness and rigidity to the end cap/stopper, allowing it to withstand the compressive forces between the two telescopic tubes.

User
Buckminster Fuller described a building construction that had some similarity to this special ribbon part acting to tensionally hold back a section. Tension lines would go from the top of one cylinder to bottom of the next cylinder. Continuing such he build a tower that was given some special name.

ChatGPT
It sounds like you may be referring to Buckminster Fuller's concept of a tensegrity structure. Tensegrity, short for "tensional integrity," is a structural principle in which a system of compression members (such as struts or cylinders) are suspended within a network of tension members (such as cables or ribbons) in a way that creates a stable, self-supporting structure.

Fuller applied the tensegrity principle to a variety of structures, including buildings, bridges, and towers. One example of a tensegrity tower that Fuller designed is the "Fly's Eye Dome," a spherical structure made up of interconnected tension and compression elements. Another example is the "Geodesic Dome," a complex three-dimensional structure made up of interconnected triangular panels.

It's possible that the special ribbon part you are describing could be used as a tension member in a tensegrity structure, helping to distribute tension forces and provide stability to the overall structure. However, without further information, it's difficult to say for certain how the ribbon part might be used in this context.

User
It is like the top rim of the base telescopic tube is spanned by drooping lines; then on top of those line or cables or ribbons, place another circular cylinder with the circle facing the drooping lines; then at the top of the second cylinder have another set of drooping line spanning across the cylinder top; then on top of that cylinder repeat the pattern. My special ribbon part with the thickened ends (which ends can be seen as anchors) seems to be playing such function as one of Fuller's towers.

ChatGPT
Thank you for the additional information. Based on your description, it sounds like the special ribbon part you are referring to could indeed function as a tension member in a tensegrity tower similar to those designed by Buckminster Fuller. The thickened ends of the ribbon could act as anchor points or attachment points for the drooping lines, while the midsection of the ribbon could help distribute tension forces across the surface of the cylinder.

In a tensegrity tower, the tension members and compression members work together to create a stable, self-supporting structure. The drooping lines that you mentioned would likely function as tension members, while the circular cylinders would function as compression members. By alternating layers of tension and compression members, a tensegrity tower can be built that is strong and stable, yet lightweight and efficient.

It's always fascinating to see how principles of engineering and design can be applied across different fields and contexts. Thank you for sharing your observations and insights!

User
Since the ribbon with thickened ends droops somewhat like a cupping path and is used to hold back the inner telescopic tube, I am called the part "Joe Cup".

ChatGPT
"Joe Cup" is a creative and descriptive name for the ribbon segment you have described. It captures the cupping shape of the ribbon with its thickened ends acting as anchor points, while also referencing the function of the part in holding back the inner telescopic tube. Naming engineering components and parts is a common practice and can help with communication and identification among engineers and designers. Thank you for sharing your naming convention!

User
There is a similarity with the sling of a slingshot. The ribbon of rubber tensionally holds back the shot; the ribbon of rubber is anchored at two points usually. Further, there is a similarity with bow and arrow; the bowstring is equivalent to Joe Cub; the arrow is similar to inner smaller tube of a set of two telescopic tubes.

ChatGPT
Yes, the similarities you've identified between the "Joe Cup" and the tension elements in a slingshot or a bowstring are quite apt. In both cases, a tensioned element is used to hold back a projectile or an object that is being launched, with the tensioned element anchored at two points. The use of tensioned elements in engineering is a common practice and can be seen in a variety of applications, from the cables that support suspension bridges to the springs that cushion the wheels of a car.

Drawing analogies between different engineering concepts and systems is a useful way to gain insight and inspiration for new designs or solutions to problems. Thank you for sharing your observations!

User
One more: Let the Joe Cup be seen as a kite system of two spread anchors; let the ribbon midsection of a Joe Cup be seen the wing of ribbon kite; let the held-back inner telescopic tube be seen as the wind of the kiting involved. Let the base telescopic tube end be seen as Earth participating in the anchoring means of the kite system where the thickened end of the Joe Cup anchor at the end of the base telescopic tube when the telescopic tube pair are in axial compression.

ChatGPT
I think that is another interesting analogy you've drawn there! Seeing the "Joe Cup" as a kite system with the ribbon midsection acting as the wing and the held-back inner telescopic tube as the wind gives us a new perspective on how the part is functioning in the larger system. The analogy of the base telescopic tube end as Earth participating in the anchoring means of the kite system is also a nice touch, as it highlights the importance of having a stable anchor point to keep the entire system in place.

Drawing analogies between different engineering systems can be a powerful tool for understanding and problem-solving, as it allows us to apply concepts and principles from one system to another. Thank you for sharing your insights and for the creative analogies!

[JoeF]

Firming some progress on the "Joe Cup telescopic-tube joining insertion limiter straps":
Have two such devices have strap thickening to just fill the gaps surrounding the inner wall of the base telescopic tube and the outer wall of the inserted telescopic tube. The arrangement functions then as an axial-compression station keeper and gap-filler for great fitting of two telescoping tubes. Using such device assumes that the two telescopic tubes will have a positive gap that can be filled by the Joe Cup position-keeping double-knobbed straps.
Have the Joe Cup mod be clean (absent dirt, sand, dust) and perhaps surfaced for low-friction sliding to facilitate insertion and extraction during assembly and disassembly. Note that field mod could find applying some Teflon adhesive tape to a side of the knobbed straps might solve some challenge. However, Dyneema strapping may have enough low friction that there may not be any need for further lubrication or low-friction making.
===========================Caution: AI ChatGPT to give notes:

To surface the Joe-Cup straps for low friction, you can consider the following options:

Material selection: Choose a material for the straps that has low friction properties, such as Teflon, nylon, or silicone. These materials have smooth surfaces that can reduce friction during sliding.

Lubrication: Apply a lubricant to the straps to reduce friction. Silicone-based lubricants or dry lubricants like graphite powder can be used to create a slippery surface.

Coating: Apply a low-friction coating to the straps. There are various coatings available, such as polytetrafluoroethylene (PTFE), which can be sprayed or dipped onto the straps to provide a low-friction surface.

Polishing: Polish the surface of the straps to make them smoother. This can be done using fine-grit sandpaper or polishing compounds to remove any roughness and create a smoother surface.

Surface texturing: Add small grooves or patterns to the surface of the straps to reduce contact area and friction. These textured surfaces can help in creating a low-friction sliding motion.

It's important to note that the specific method you choose will depend on the materials used for the Joe Cup straps and the level of precision required for the application. Experimentation and testing may be necessary to determine the most effective approach for achieving low-friction sliding.

JoeAsksChatGPT: Could Teflon adhesive tape applied to the Joe-Cup strap help give lubrication to the base tube and the inserted telescoping tube, assuming there is some positive gap to fill to result in a snug coupling?
ChatGPT answers:
Yes, applying Teflon adhesive tape to the Joe-Cup strap can provide lubrication and help reduce friction between the base tube and the inserted telescoping tube. Teflon (PTFE) is known for its low friction properties, and using adhesive tape made of this material can create a smooth, slippery surface.

By wrapping the Teflon adhesive tape around the Joe-Cup strap, you can introduce a lubricating layer that facilitates the sliding motion during assembly and disassembly. The tape will act as a barrier between the contacting surfaces of the base tube and the inserted telescoping tube, reducing friction and allowing for smoother insertion and extraction.

Make sure to properly apply the Teflon adhesive tape to ensure good coverage on the Joe-Cup strap. It's also recommended to clean the surfaces of the base tube and the inserted telescoping tube before applying the tape to ensure optimal adhesion and performance.

Remember to test the setup and make any necessary adjustments to achieve the desired snug coupling while maintaining smooth sliding action.
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User
Could Teflon adhesive tape applied to the Joe-Cup strap help give lubrication to the base tube and the inserted telescoping tube, assuming there is some positive gap to fill to result in a snug coupling?
ChatGPT
Yes, applying Teflon adhesive tape to the Joe-Cup strap can provide lubrication and help reduce friction between the base tube and the inserted telescoping tube. Teflon (PTFE) is known for its low friction properties, and using adhesive tape made of this material can create a smooth, slippery surface.

By wrapping the Teflon adhesive tape around the Joe-Cup strap, you can introduce a lubricating layer that facilitates the sliding motion during assembly and disassembly. The tape will act as a barrier between the contacting surfaces of the base tube and the inserted telescoping tube, reducing friction and allowing for smoother insertion and extraction.

Make sure to properly apply the Teflon adhesive tape to ensure good coverage on the Joe-Cup strap. It's also recommended to clean the surfaces of the base tube and the inserted telescoping tube before applying the tape to ensure optimal adhesion and performance.

Remember to test the setup and make any necessary adjustments to achieve the desired snug coupling while maintaining smooth sliding action.

User
We are assuming that there will be a gap between the base tube and the inserted tube. That gap will be intended so that the Joe Cup strap thickness can fill the gap.
ChatGPT
Apologies for the confusion. If the intention is to have a positive gap between the base tube and the inserted telescoping tube, and the Joe-Cup strap thickness is designed to fill that gap, applying Teflon adhesive tape directly to the Joe-Cup strap may not be the most effective solution.

In this case, the Teflon adhesive tape on the Joe-Cup strap could potentially interfere with the desired snug coupling, as it would add additional thickness to the strap. Instead, you could consider applying the Teflon adhesive tape directly to the inner wall of the base tube or the outer wall of the inserted telescoping tube.

By applying the Teflon adhesive tape to the inner wall of the base tube or the outer wall of the inserted telescoping tube, you can create a low-friction surface that allows for smoother sliding and insertion of the telescoping tubes. This would eliminate any interference from the Joe-Cup strap and ensure that the gap is filled snugly by the strap.

Remember to clean the surfaces of the base tube and the inserted telescoping tube before applying the tape to ensure good adhesion. Test the assembly and make any necessary adjustments to achieve the desired fit and smooth sliding action.

User
An option: Plan ahead: Have the strong Joe-Cup strap be sided on both sides of strap with Teflon adhesive tape. The pile then is tape, strap, tape to fill half gap'; the the other side is similar: tape, strap, tape to finish the gap filling. The structure of the Joe-Cup sided with tape segments would be packed for tote as a separate part; this all leaves the base tube and inserted tube free from any applied material so that nesting of all tubes during tote is carefree.
ChatGPT
I apologize for any misunderstanding. If your intention is to use Teflon adhesive tape on both sides of the Joe-Cup strap to fill the gap between the base tube and the inserted telescoping tube, your proposed approach can work. By sandwiching the strap between two Teflon adhesive tape segments on each side, you can create a low-friction surface that fills the half-gap on one side and completes the gap filling on the other side.

By packing the Joe-Cup with the Teflon adhesive tape segments as a separate part, you can ensure that the base tube and inserted tube remain free from any applied material. This allows for easy nesting of all tubes during transport without any concerns.

Please ensure that the Teflon adhesive tape segments are securely attached to the Joe-Cup strap to prevent any shifting or detachment during assembly or disassembly. Additionally, testing and adjusting the dimensions of the tape segments and strap thickness may be necessary to achieve the desired snug coupling and smooth sliding action.

Remember to clean the surfaces of the base tube and inserted telescoping tube before assembly to ensure optimal performance.
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User
If the Joe-cup strap is made of Dyneema webbing, would use of Boron Nitride spray-on powder work?

ChatGPT
Using Boron Nitride spray-on powder on a Dyneema webbing Joe-Cup strap can potentially help reduce friction and facilitate smooth sliding. Boron Nitride is known for its excellent lubricating properties and high-temperature stability, making it suitable for applications where low friction is desired.

However, there are a few factors to consider:

Adhesion: Dyneema webbing has a low surface energy, which may affect the adhesion of the spray-on powder. Ensuring proper surface preparation, such as cleaning the webbing thoroughly, can help improve adhesion.

Compatibility: It's important to ensure that the Boron Nitride spray-on powder is compatible with Dyneema and does not cause any degradation or damage to the webbing material. It's recommended to consult the manufacturer or supplier of the spray-on powder to confirm its suitability for use with Dyneema.

Application: Follow the instructions provided with the Boron Nitride spray-on powder for proper application. Ensure an even and thorough coating of the powder on the Dyneema webbing to achieve the desired low-friction effect.

Testing: Before implementing the solution in your specific application, it's advisable to conduct testing to assess the effectiveness and durability of the Boron Nitride-coated Dyneema webbing strap. Test the assembly, sliding action, and overall performance to ensure it meets your requirements.

It's worth noting that Dyneema already has relatively low friction properties, and adding a lubricating coating like Boron Nitride may further enhance its performance. However, individual results may vary, and experimentation and testing are essential to confirm the effectiveness of the solution in your particular application.
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User
Does BN (boron nitride) degrade polyethylene?
ChatGPT
Boron Nitride (BN) is generally considered to be chemically inert and does not react with most materials, including polyethylene. It is often used as a lubricant or coating material precisely because of its non-reactive nature and high-temperature stability.

Polyethylene is a thermoplastic polymer that is known for its chemical resistance. BN is unlikely to degrade or react with polyethylene under normal conditions. However, it's always advisable to conduct compatibility testing or consult the manufacturer of both the BN and polyethylene materials to confirm their compatibility in your specific application.

Keep in mind that factors such as concentration, temperature, and specific formulations of BN or polyethylene could potentially affect their compatibility. If you have any concerns about potential interactions between BN and polyethylene, it's best to consult with experts or perform small-scale tests to ensure compatibility before applying BN to polyethylene surfaces.

User
Is Dyneema line simply a form of polyethylene?
ChatGPT
Yes, Dyneema line is a form of polyethylene. Specifically, it is made from an ultra-high molecular weight polyethylene (UHMWPE) fiber. UHMWPE is a type of polyethylene with a very high molecular weight, resulting in exceptional strength, high abrasion resistance, and low stretch properties. Dyneema is a well-known brand of UHMWPE fiber used in various applications, including ropes, lines, and other high-performance products.

[JoeF]

Some spars in some tiny-packed HGs will want to face resistance to axial compression at different amounts. Aiming for optimal designing of the spars involves attention for snugness of the overlap of tube segments or angle segments. And also the amount of overlap involved at the overlap regions.

Note: A HG spar might be in axial compression might be with a benefit from being singly tapered; in other cases doubly-tapered may serve better. When doubly-tapered via use of telescopic tube segments, note that a common result is to tote with two sets of nested tubes, one nested set having an even count of nested segments with the other having an odd count of nested segments; thus a 3-segment doubly-tapered spar could tote with the two sets' counts of 2 and 1, while a 5-segmented doubly-tapered spar could tote with the two nest sets of count 2 and 3; and a 7-segmented doubly-tapered spar with toted nests of counts 3 and 4.

ChatGPT weighs in on the general question:

User prompter
Is there a recommended amount of overlap for telescopic tubes that form a doubly-tapered spar?
ChatGPT
The recommended amount of overlap for telescopic tubes forming a doubly-tapered spar can vary depending on several factors, including the specific application, materials used, desired strength and stiffness, and the design requirements of the structure.

In general, the overlap length is determined by considering the desired structural integrity and load-carrying capacity of the spar. The overlap provides additional contact area between the tubes, allowing for better load transfer and increased overall strength.

Typically, the overlap length is chosen to ensure a sufficient bonding or mechanical connection between the tubes while also minimizing the weight and complexity of the structure. A longer overlap generally provides better load transfer and strength, but it may increase the weight and cost of the spar. Conversely, a shorter overlap may reduce weight but could compromise the structural integrity.

To determine the recommended amount of overlap for a specific design, it is advisable to consult with a structural engineer or a specialist in the field. They can evaluate the specific requirements of your application and perform detailed calculations to determine the optimal overlap length that balances the desired strength, weight, and other design considerations.

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Chatting with ChatGPT:

User, prompter:
Once tiny-packing (packs at 1 meter long and less than 1 sq. ft base) of hang gliders is achieved, there may be a new market for hang gliders. Will such compete with the paraglider packs?
ChatGPT
If the development of tiny-packing hang gliders becomes a reality, it could potentially open up new opportunities and markets for hang gliders. The compact size and portability of such hang gliders could make them appealing to individuals who value ease of transportation and storage.

Whether these compact hang gliders would compete with paraglider packs would depend on various factors, including personal preferences, practicality, and the specific advantages of each type of glider.

Hang gliders and paragliders have some fundamental differences in design and flying characteristics. Hang gliders typically offer a more rigid structure and a faster, more dynamic flying experience, whereas paragliders are known for their ease of use, slower speeds, and simpler setup. These characteristics attract different types of pilots with varying preferences.

While the compact hang glider packs might appeal to individuals looking for the advantages of hang gliding in a more convenient and portable package, paragliders would likely still have their own market due to their distinct flying characteristics and established popularity.

Ultimately, the success and competition between hang gliders and paragliders would depend on the preferences and demands of the flying community, as well as the technological advancements and market trends in the industry.

[JoeF]

One tiny-packed HG might be meta-described as an instance of a hexagonal bipyramid.
Let the two vertices of valence 6-edge be variously the nose and tail end of the HG's keel. Let the hexagon normal to that keel be called the rigging plane holding exterior points of two queen posts and two kingposts and spanwise spar(s) (total of six).