Table 7: Comparison of four pitch trim strategies.
|
Strategy |
A |
B |
C |
D |
|
|
Lift constant |
No |
No |
Yes |
Yes |
|
|
Principle |
Deflection of elevator only |
Optimal |
Elevator and outer flap only |
Modification of optimal* |
|
|
Deflections |
δ1 |
8.9798 ° |
7.4047 ° |
-2.1173° |
7.6° |
|
δ2 |
0.0° |
7.5882° |
0.0° |
7.6° |
|
|
δ3 |
0.0° |
-0.60480° |
0.0° |
-7.6° |
|
|
δ4 |
0.0° |
-1.4860° |
2.8215° |
0.0° |
|
|
δ5 |
0.0° |
-7.2529° |
0.0° |
-7.6° |
|
|
Trim drag |
Counts |
-16 |
-8 |
-103 |
+31 |
|
Penalty |
-2.8% |
-1.4% |
-18.1% |
5.4% |
|
|
Total drag |
0.00553 |
0.00561 |
0.00466 |
0.00600 |
|
*all deflections not exceeding 7.6°