[JoeF]

HPHG

Happy-Packed Hang Gliders
are dedicated to finding hang glider pack designs that bring smiles to all.
Join the designing group and be part of history.
Smile when the pack is acceptable on city buses.
Smile when the pack is easily toted as a towed wagon when trekking the packed hang glider.

In the realm of the sky, where dreams take flight,
"Happy-Packed Hang Gliders" shine so bright,
Dedicated to designs that bring joy and cheer,
We craft the future with smiles, crystal clear.

Join our group of creators, visionaries at heart,
Be part of a legacy, where smiles play a part,
For when the city buses accept our compact grace,
We celebrate the journey, with a smiling face.

Easily toted like a wagon, when trekking anew,
Our packed hang glider follows, a loyal, trusted crew,
In the adventure of life, where the horizon's wide,
"Happy-Packed Hang Gliders" make us glide with pride.

[JoeF]

Is the pack a happy scene for you?
What makes you happy about the pack?

A packed hang glider is a "happy packed HG" for me when people next to me while riding the city bus with my pack(s) are not disturbed, when I can tow the pack easily when trekking to and from a launch site. Packs of 5-ft or less tend to be happier deals. Packs of 30 lb or less seem to tease a kind of special pleasant smile. Oh happy packed hang glider! What are your secrets?
.
======================
"short pack" in hang gliding is distinct from "ultra-short" .... beware.
"Short" may well be too long and might not rise to "happy-packed" ... depends, right? So measure for a design movement: 5-ft or less ... and also otherwise "happy."

[JoeF]

One day there may be factions within HPHG (Happy Packed Hang Gliders) distinguish by the focus of exploration:
Getting a happy pack for:
Bow-based HG
Bowsprit SS HG
Bowsprit DS HG
Delta SS HG
Quicksilver Mod SS HG
Quicksilver Mod DS HG
Rogallo Mod SS HG
Flying Wing SS HG
Flying Wing DS HG
Princeton Sailwing HG
Biplane HG
Disc HG
Tensairity Cantilever Monoplane SS HG
Tensairity Cantilever Monoplane DS HG
Miller Conduit Condor Mod HG
Inflatable HG
Bamboo-based framing
Fiberglass-based framing
CFRP-based framing
Telescopic spars
Coilable spars
Spinted-airbeam spars
etc.
The factions might gather in various ways to share models, plans, experiences with their special foci.

[JoeF]

An option in rib-batten formation:
Two CFRP tubes of one meter each. Bond a coupler of aluminum tube to one end of just one of the two CFRP tubes. Upon assembly of HG: let the tension on sail compress the coupled tubes. Upon happy packing: uncouple the two tubes to one-meter approximately stacking.

TwoPartRib.jpg (7.38 KiB) Viewed 733 times

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[[Saving a note ... and sharing...;:
Lash overlap plus kited s_____s with "s" as stop; two stops tethered limit overlapping.

StopperLashingCoupling.jpg (7.38 KiB) Viewed 725 times

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[dhmartens]

Update:
I have completed the prototype telescopic hang glider just now with a 28 inch leading edge and a packing length of 8.5 inches.
I have some photos of the process unfortunetly the prototype is damaged and repaired 3 times.
The keel pocket needs to be movable as a way to trim the glider (duct tape/velcro).
If I can build one of these I can build 100 of these.

[JoeF]

Doug:
Congratulations! Will be appreciating and studying whatever you show!
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Teasing:

CFRPtelescopicroundtubing.png (104.54 KiB) Viewed 711 times

[JoeF]

In one project with a 16" diameter inflated bladdered main spar, a sail sock will be tauten by stand-off struts, the sock will be position-firmed by a line of hook-and-loop. Wing twist will be governed partially by upper and lower rigging. Packing options: accordion fold spar case or wrap on crutch; accordion fold sock or wrap on crutch format. Spar case will be pinched to provide a spanwise pocket for segmented compression member. Case will be secured firmly at the wingtips. Compression member packing option: coils of rod.
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[JoeF]

Of former note: Error correction. Not 16" inflated diameter, but 14.6" diameter.
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[dhmartens]

My telescopic 28 inch hangglider made 3 test flights today but it is nose heavy (the nature of telescopic tube is heavier at the base.)
So I either alter the design or add ballast at the back of the keel.

[JoeF]

This note aims to suggest that "telescopic" based HG frames need not necessarily be "heavier at the base" when various tactics are employed.

but it is nose heavy (the nature of telescopic tube is heavier at the base.

===
What tactics might keep a telescopically-based HG frame from loading the nose region too much?
Consider HGs with spreaders; consider having the central section of left or right leading edge spar be the holder of more mass per span-foot than the section of telescopic tubing supplying the nose region. The telescopy would have the larger diameter and massive tube section at the center section of the left or right leading edge. Let A be larger diameter section, B fitting inside A, and C fitting inside B and D fitting inside C. Note that wall thickness can bring mass; sections need not all be the same wall thickness. So, e.g., have the left LE spar be CAB; the B could be even less wall thickness if such still fulfills safety needs; the A could take the bending beating and the connecting with spreader. Buckling resistance from compression can arrive from a combination of wall thickness and outside diameter. In a CAB left or right LE spar, the A section plays a different role than the B section.