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Old 10-17-2002, 06:30 AM
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Default airfoil difference guestion?

Thanks guys for your responses.
The fact is that flattened NACA provides softer center aileron control. What is also interesting is that with this airfoil the increase in aileron deflection from 25 to 45 deg has rather minor effect on roll rate. Both models have Hitec 945, 10kg servos to operate separataly each aileron, therefore deflections are rather true even at higher speeds.
Model with modified NACA is slightly slower than other one. What is also unusual is that in very tight loops at high speed the loops become of fairly regular poligon shape instead of circular, behaving like the laminar airflow on the wing was disturbed with kind of regular pace. This is really funny effect, especially that in the other model to achieve this I should really work hard on the elevator.
Otherwise both models behave very similarly.

Robert