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Airfoil Thickness

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mikemill757

Well-Known Member
Joined
Feb 29, 2008
Messages
50
Location
Portland metro, Oregon
I'm planning to use the AS5046 airfoil for my bird. I'm planning for the root foil to be 16% (42" chord) and the tip to be 18.7% (30" chord) to eliminate washout, cruise about 180-200 kts and stall 56 kts (Raymer). Using a thicker airfoil lets me build a strong and light spar and a higher Cl (split flaps) and more room for the retracts.
My question - what are the disadvantages of a relatively thick airfoil other than a little more frontal area/drag? How thick is too thick?

Mike
 
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