Table 9: Effect of lift equilibrium on pitch trim strategies.
Strategy |
I |
II |
VI |
||
Concept |
Equal deflection of all control surfaces |
Deflection of elevator only |
Equal contribuition to lift from each control surface |
||
Cruise lift equilibrium |
No |
Yes |
No |
Yes |
Yes |
CL α CM (δ = 0º) |
0.10588 0.71789° 0.02441 |
0.10588 1.8406° 0.04971 |
0.10588 0.71789° 0.02441 |
0.10588 2.0727° 0.05601 |
0.10588 2.27940° 0.05968 |
δ1 δ2 δ3 δ4 δ5 |
4.46780° 4.46780° 4.46780° 4.46780° 4.46780° |
1.7200° 1.7200° 1.7200° 1.7200° 1.7200° |
8.7977° 0.0° 0.0° 0.0° 0.0° |
10.367° 0.0° 0.0° 0.0° 0.0° |
6.6990° 7.6277° 2.7478° 14.971° 5.3920° |
CD ΔCD ΔCD/CD (%) |
0.00659 +89 +15.6 |
0.00766 +197 +34.5 |
0.00553 -16 -2.8 |
0.00551 -18 -3.2 |
0.01089 +520 +91.4 |