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Old Feb 09, 2013, 02:36 AM
ieyasu is offline
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USA, CO, Fort Collins
Joined Sep 2010
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In case it's not too late, here are some numbers. Carbon fiber is something like 20-30x stronger than spruce or basswood for an equal size, but it's also heavier. If you use solid 1/8x3/8 carbon caps, I'd bet everything else in the wing will break before those caps. Some quick math shows each 48" cap would weigh about 2 ounces, while a wood cap of the same size would be more like 0.6~0.7 ounce.

If this page is still authoritative, you just might squeak by with a solid carbon spar, depending on the CD.
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