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Getting the "Wright" Pitch
Activity 1

Using the data from the "Alpha" and "CM" columns of the chart, complete the graph on the next page. Follow the steps listed below.

First, plot the points for only "Run #1" from the "Alpha" and the "CM" columns. During this wind tunnel test, the elevator was set at 0 degrees angle of attack. The angle of attack is indicated by the data in last column which is the delta sub "e" (elevator deflection angle). Connect these points with a black line.

Second, plot the points for "Run #2" from the "Alpha" and the "CM" columns. During this wind tunnel test, the elevator was set at a positive pitch of +10 degrees. The angle of attack is indicated by the data in the column which is the delta sub "e" (elevator deflection angle). Connect these points with a blue line.

Third, plot the points for "Run #3" from the "Alpha" and the "CM" columns. During this wind tunnel test, the elevator was set at a negative pitch of -10 degrees. The angle of attack is indicated by the data in last column which is the delta sub "e" (elevator deflection angle). Connect these points with a red line.

Fourth, label point (0, 2) with the letter "A". This is the point at which the aircraft encounters turbulence. The nose pitches up. The pilot takes no action.

Fifth, label point (-0.002, 6) with the letter "B". The aircraft responds to the turbulence by pitching the nose back to its original position, so the airplane returns to point "A".

Coeffiecient of Pitch Moment vs. Alpha


 
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