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Re: Safe-Splat

Postby JoeF » Wed Sep 12, 2018 12:46 pm

they do not contribute anything to a good pilot's stand-up landing

OK; but what about a good pilot's perhaps-rare landing challenge where gouging basebar parts meet ground? Such happens.
One day ... :) ,,, I hope to design and build or have someone else do such: pop-up wheels or pop-up rollers or pop-up spoon skis or ____
that would allow full streamlining nude basebar for flight, but be an available alternative when good flare or good run out is missed.

===========================
Just saving some not-baked flashes:
== basebar streamlined complex having rotatable parts becoming two skis.
== string spokes for CO2-cannister-inflated wheels or rollers otherwise embedded in the streamlined shape of basebar.
== skid gloves
== pilot-body forward-limit line
==
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Re: Safe-Splat

Postby Rick Masters » Wed Sep 12, 2018 1:51 pm

OK; but what about a good pilot's perhaps-rare landing challenge where gouging basebar parts meet ground? Such happens.

It does. But in most instances where I've damaged my glider, wheels would not have helped.
Wheels and skids are useful over a narrow speed range - what I call "tripping speed" - and a particular direction - what you call "straight."
Ground loops, collisions with brush or terrain, and losing control at touchdown - such as a wing being lifted by a thermal and the ensuing hard landing - are rarely helped by wheels or skids.
You are into advanced crash management in those situations.
Knowing how to position your body to avoid injury, and allowing the air frame to take the blow instead, are key survival techniques.
So you want to know if I would sacrifice the potential small safety advantages of wheels or skids for the decreased drag and weight and simplicity of having only the triangular control frame?
In a word, yes. Easily.
But it is each pilot's individual decision.
I am not criticising those who choose to fly with landing aids.
They're just not for me.
Rick Masters: Dangerous Thoughts    USHGA #30816    View my rating at: US Hang Gliding Rating System
A lot of foolish people think they're hang gliding with parachutes - but nobody ever thinks they're parachuting with hang gliders.
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Re: Safe-Splat

Postby JoeF » Wed Sep 12, 2018 2:01 pm

Understood. Sales team with future product will call you later, Rick :)
======================================================================
First solo and sand landing:
SandWhatNextFirstSolo.JPG
SandWhatNextFirstSolo.JPG (27.81 KiB) Viewed 64 times

SandWhatNextFirstSolo02.JPG
SandWhatNextFirstSolo02.JPG (24.08 KiB) Viewed 64 times

SandWhatNextFirstSolo03TCFgouge.JPG
SandWhatNextFirstSolo03TCFgouge.JPG (29.36 KiB) Viewed 64 times
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Re: Safe-Splat

Postby JoeF » Wed Sep 12, 2018 7:34 pm

This for suggestive design purposes only:
morph-collapsible-foam-roller
Play with iterations of streamlined basebared axial structures that may morph at pilot command to a long large-diameter roller. If the landing seems not to need the roller, then the material stays in its streamlined format. If the pilot wants the streamlined basebared assembly to deploy to round roller format, then some trigger presto-change-o pops up the roller. Thus, not just two gouging wheels, but a long fat-diameter roller.

And video:


=================================
Paper Technical, PDF Structural Behavior of Inflatable, Reinforced, Braided, Tubular Members
Joshua Clapp
University of Maine

=====================================
Two unbaked flashes archived here:
== Side-stored flat expands to roller
== Accordion-collapse to streamlined form over basetube of TCF; inflate to expand the accordioned skin to full roller when wanted. Radial string interior spokes.
== Study all bellows
====================================
PDF technical paper: Review of Inflatable Booms for Deployable Space
Structures: Packing and Rigidization

=============================================
Bellows

=========================================
AccordionSkinnedRadialSpokesInflatableBasebarBasedDeployableRoller.JPG
Clip from video:
AccordionSkinnedRadialSpokesInflatableBasebarBasedDeployableRoller.JPG (48.1 KiB) Viewed 59 times

=========================================


============================================================
Something posted in this topic thread six years ago is repeated here:
Image
Roller hidden streamlined; deployment has basebar as axle for long roller.
============================================================
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Re: Safe-Splat

Postby JoeF » Tue Sep 18, 2018 8:51 pm

DaveKilbourneLargeDiameterWheels.JPG
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The beginning of Hanggliding / Playground in the Sky Full Movie
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