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Jul
13
Written by:
Jeff O'Brien
7/13/2010 10:16 AM
Moyes weighs in with an advisory (7.13.10): LINK HERE
After perusing forums, there seems to be little debate - 2mm sidewires aren't worth the performance advantage.
Several of the intimate players in previous incidents have weighed in via comment on the Wills Wing blog:
Image from the Wills Wing website
Dave Shields:
"My sidewire failure was just out of the nicopressing on a wire with just around 100 hours airtime very little of which included aerobatics (maybe 2 days at Stanwell park in January). At the time the wire failed I was pulling 122kph (taken from vario) to build speed and was flying with straight arms but was not pushing out! The glider was rounding out at the bottom of the dive. Eye witnesses reported a dusty or thermal in the field moments after my incident. Maybe this caused a shock loading? Who can say!
What i do know is that the wires on my replacement glider will be slightly thicker.. maybe the 7x7 type for greater flexibility too!
I can send pics of the failed wire if it helps..."
Thanks much Dave! Photos would be instructive. Best at the Europeans.
Adam Parer:
"My sidewire also failed at the nico but it was obvious the tang was kinked at the time of failure. This greatly reduces the performance of the wire. There is no doubt the sidewire kinked during the tumbles as it had definitely been checked during preflight, and by the launch marshal only seconds before towing out of the airfield. A thicker sidewire in my case most likely would have failed also. Point being, a stronger sidewire also needs the correct 'never-kink' size, it requires the same amount of care, checking and maintenance. No redundancy here. What we launch with is what we rely on. Glad Dave is OK."
Thanks Adam!
Mitch McAleer:
"turn your head sideways for 5 seconds and you've lost all the performance gained from skinny wires for the entire flight.
Or any number of blunders that results in an aerodynamic disruption, at what cost? breaking your glider in flight, that's what.
The glider breaks positive at max lift, around 20-25º AoA to the relative airflow. Skinny wires tested to failure around 450-575 #, stock wires 890-1250# in my experience, your results may vary.
How much performance do you think you're getting from a reduction in the diameter of the side wires?
you're winning..... "
Thanks Mitch!
Image from Hanggliding.org
Is this safety concern serious enough to attempt to ban 2mm sidewires in competition? Regardless of policy, it has always been the pilot in command who makes the final determination on safety whether it's gear or conditions related. As I mentioned before, all US team members flying Wills Wing will be flying with 3/32 (thicker) wires in upcoming competitions.
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8 comment(s) so far...
Re: Sidewire Safety Progression
thoughts on aerodynamic stabilization? I don't want to add much drag and have it end up farther behind though. I'm also not a modeler, so fashioning a wing to put it in seems difficult.
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