Skids

A discussion restricted to the topic of hang gliding.
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The Oz Report
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Skids

Post by The Oz Report »

<div id="1546954096"><i>For many different gliders</i><br><p>Web site <a target="_blank" href="http://www.fluggeraete-zubehoer.com/?fb ... .</p><p><a target="_blank" href="http://www.fluggeraete-zubehoer.com/?fb ... _H6E"><img border="0" src="../pub/images/carbonskids.jpg" width="505" height="674"></a></p><p>In English <a target="_blank" href="http://www.fluggeraete-zubehoer.com/htm ... .</p></div>
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Aeropilot
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Re: Skids

Post by Aeropilot »

The Oz Report wrote:<div id="1546954096"><i>For many different gliders</i><br><p>Web site <a target="_blank" href="http://www.fluggeraete-zubehoer.com/?fb ... .</p><p><a target="_blank" href="http://www.fluggeraete-zubehoer.com/?fb ... _H6E"><img border="0" src="../pub/images/carbonskids.jpg" width="505" height="674"></a></p><p>In English <a target="_blank" href="http://www.fluggeraete-zubehoer.com/htm ... .</p></div>
Great aesthetics on these skids. However, resin composites don't slide very well and are easily damaged. UHMWPE works much better IMO.
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Davis
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Post by Davis »

Link to source?
Fly Florida
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Skids

Post by Fly Florida »

These skids worked well for "flying speed" (normal) skid landings. If one drops-in vertically with initial contact on one skid with even partial body weight on the strap or down tubes, a carbon bar is likely to break at the loaded skid point.
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DougM
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Re: Skids

Post by DougM »

Fly Florida wrote:These skids worked well for "flying speed" (normal) skid landings. If one drops-in vertically with initial contact on one skid with even partial body weight on the strap or down tubes, a carbon bar is likely to break at the loaded skid point.
Perhaps internal reinforcement of the CF bar could help prevent excessive surface deflection and laminate rupture? Something like a low-density epoxy filler within the bar towards the inner sections, and a higher-density epoxy filler applied against the former filler, and directly adjacent to the skid attachment. The aluminum corner bracket then would then be forced into the filler and reattached.
Or some combination of the above with a shaped wood plug making up much of the reinforcement's volume.
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NMERider
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Re: Skids

Post by NMERider »

DougM wrote:
Fly Florida wrote:These skids worked well for "flying speed" (normal) skid landings. If one drops-in vertically with initial contact on one skid with even partial body weight on the strap or down tubes, a carbon bar is likely to break at the loaded skid point.
Perhaps internal reinforcement of the CF bar could help prevent excessive surface deflection and laminate rupture? Something like a low-density epoxy filler within the bar towards the inner sections, and a higher-density epoxy filler applied against the former filler, and directly adjacent to the skid attachment. The aluminum corner bracket then would then be forced into the filler and reattached.
Or some combination of the above with a shaped wood plug making up much of the reinforcement's volume.
There is no reason those skids can't be rotationally molded from polyethylene or better yet, press-molded from weldable UHMWPE in two halves then welded together.
The natural slipperiness and impact absorbing qualities of PE should transfer less shock to the brittle carbon speedbar.
Alternately, the molded carbon design needs to be modified so that a thick enough layer of low durometer polyurethane can be installed to cushion the speedbar from impact.
I use an aluminum speedbar with solid UHMWPE skids which avoids the fracture issue altogether.
I have since modified one of my streamlined aluminum speedbars to accept the Finsterwalder 200mm x 50mm pneumatic wheels which I consider a safer alternative to skids with only a modest drag penalty.
Did I mention that getting old kid of sucks? But then I'd be preaching to choir in the world of hang gliding.
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