An airfoil wind-tunnel specimen is a small wing that spans the width of a $2^{?} X 2^{?}$ tunnel section and has a chord of 6 inches. It develops a reaction force $R$ with a magnitude of $6.83 lbs$ , located $30%$ of the chord behind the leading edge and inclined 8.5 degrees forward from the direction normal to the chord. Calculate $c_{1}, c, c_{me}$ , if the airfoil was operating at an angle of attack of 10.1 degrees and a freestream velocity of $90.9 fps$ at a standard density altitude of $2, 000 ft$ ..

Question

An airfoil wind-tunnel specimen is a small wing that spans the width of a

2^{?} X 2^{?}

tunnel section and has a chord of 6 inches. It develops a reaction force

R

with a magnitude of

6.83 lbs

, located

30%

of the chord behind the leading edge and inclined 8.5 degrees forward from the direction normal to the chord. Calculate

c_{1}, c, c_{me}

, if the airfoil was operating at an angle of attack of 10.1 degrees and a freestream velocity of

90.9 fps

at a standard density altitude of

2, 000 ft

..

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