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In a message dated 1/10/2003 7:37:33 AM Central Standard Time, IIP@hawaii.rr.com writes:
And what is the relationship (if any) to the fact that
the 98 sq.ft. Lancair IV wing sustained 12,000 lbs. during a static
test?
Oops, I forgot to finish,
Static G-loading: Lancair is very conservative. In a type certificated airplane, the max G-load is 1.5 x (POH value) x max gross weight. Lancair typically uses 2 x (POH value) x max gross weight. This means that the P wings were probably tested to 2 x 4.4 x 3200 = 28160 or about 14000 pound per wing. If it was 12000 pounds, the safety factor would be 24000/3200=7.5/4.4=1.7, still greater than FAA requirements of 1.5.
So what?
At gross weight-
Max structural cruising speed (Vno, top of green arc) is that speed at which max G-loading would occur if vertical gusts of a certain speed hit the wing (turbulence).
Maneuvering Speed (Va) is the speed at which full deflection of the control surfaces (usually the elevator) would result in the max G-loading.
Scott Krueger
N92EX
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