Thanks for the info on spar wood guys. For those interested, I do need a
center spar length that is 2 feet longer than normal. The 18% chord AS
airfoil will improve the strength and load bearing necessary for my project.
The
Taller spar is about 20% stronger than the stock spar which wi
Bill:
That makes sense as the momentof inertia goes up to the 3rd power of the depth
of
section
(b x h cubed)/12. 8 cubed is 512 vs 7 cubed which which is only 343 so the
spar is
much stronger so in can probably handle the added bending moment. I know the
basics
but it would take a good aero
It might be time to elaborate on what Steve Eberhart eluded to earlier.
After either tunnel tests or analysis (I forget which), Ashok decided there
was something he didn't like about the characteristics of the AS5048 near
stall...some sort of burble or separation, or something, which is when he
Bill:
The Formula I used was for a solid beam not a KR2 Spar because the Spar
is a
"Composite build of (2) solid beams(plywood skins) and the spar caps
separated by a
distance and the "Crippling" can be ignored.
Primarily the added strength comes from the added depth section which is
taken to
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