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Jul
9
Written by:
Jeff O'Brien
7/9/2010 6:48 AM
There's been significant buzz regarding 2mm sidewires over the past 24, with most coming to the conclusion it's not worth the negligible performance advantage to have bottom sidewires as the weakest link in the structural system. I received an e-mail from Dustin Martin this morning and it seems there's consensus from the Wills Wing team that everyone will be running 3/32 wires for free flying and cross country competitions from now on. Keep reading for a further explanation on bottom sidewires and perhaps try one of the following drag reducing tactics in lieu of 2mm sidewires:
A further explanation on Wills Wing sidewires:
The normal bottom side wires on a T2C are 3/32 1x19 uncoated.
These are thicker than the "competition type" side wires, which are 5/64 1x19 uncoated.
They are less thick in total diameter (though stronger) than 3/32 7x7 coated wires, which are about 1/8" total diameter.
Then there are the 1/8" 7x7 coated, which are larger diameter wires, with a much larger total diameter (about 5/32")
The stock 3/32 1x19 uncoated are what we recommend, and they are plenty strong enough for the application.
The 3/32 7x7 coated wires are a reasonable alternate option, though they are weaker, and have more drag. Some pilot prefer coated wires for other reasons, such as the idea that perhaps they are less likely to cause injury in a crash (though you don't often hit the side wires) or that they are less likely to cut or burn through a parachute bridle during a deployment.
The 1/8" coated wires are probably not a good idea. Pilots often request these because they think it gives them an additional safety margin, but in reality this probably isn't true. A properly maintained 3/32" wire will not be the first item to fail in a structural overload - that would most likely be the downtube. An improperly maintained wire, regardless of diameter, will eventually become the weakest element on the glider, and at worst could fail under a normal flight load of less than two G's. The additional safety margin provided by a larger diameter wire, if the wire is compromised by lack of maintenance, is inconsequential - the only difference is that it would take slightly longer for the larger diameter wire to have its strength reduced to the same level. However, the root cause of the loss of strength - which is most commonly a severe kink in the wire - is more likely on a larger diameter wire, so this likely offsets any advantage.
Back to your regularly scheduled programming. Wolfgang Siess super skimming.
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Re: Further Sidewire Information
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Re: Further Sidewire Information
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