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#2
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Dudley Henriques wrote:
There is a special case where you can unload the airplane in roll to increase the roll rate. It's done in fighters all the time in ACM. You can experience it in your everyday light aerobatic airplane by doing an aileron roll from a nose high roll set position, then as the airplane goes past the first knife edge position, go forward on the pole to unload the wings but not enough to go negative. Keeping the aileron in hard while you do this increases the roll rate and as a side effect flattens the roll in pitch at the same time making it prettier :-) Why does this work? Matt |
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Matt Whiting wrote:
Dudley Henriques wrote: There is a special case where you can unload the airplane in roll to increase the roll rate. It's done in fighters all the time in ACM. You can experience it in your everyday light aerobatic airplane by doing an aileron roll from a nose high roll set position, then as the airplane goes past the first knife edge position, go forward on the pole to unload the wings but not enough to go negative. Keeping the aileron in hard while you do this increases the roll rate and as a side effect flattens the roll in pitch at the same time making it prettier :-) Why does this work? Matt Several factors effect roll rate, roll acceleration and roll inertia. Basically why this works is that unloading the airplane while rolling (aileron roll basically, not a slow roll) minimizes much of the effectiveness issues experienced by the ailerons especially at low airspeeds and high load factors when the wings are generating a fair amount of lift. Anytime you want to maximize the roll rate, unloading will achieve this. The exact point where the rate is maximized by unloading will vary from aircraft to aircraft but basically the rule still applies. Dudley Henriques |
#4
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Dudley Henriques wrote:
Matt Whiting wrote: Dudley Henriques wrote: There is a special case where you can unload the airplane in roll to increase the roll rate. It's done in fighters all the time in ACM. You can experience it in your everyday light aerobatic airplane by doing an aileron roll from a nose high roll set position, then as the airplane goes past the first knife edge position, go forward on the pole to unload the wings but not enough to go negative. Keeping the aileron in hard while you do this increases the roll rate and as a side effect flattens the roll in pitch at the same time making it prettier :-) Why does this work? Matt Several factors effect roll rate, roll acceleration and roll inertia. Basically why this works is that unloading the airplane while rolling (aileron roll basically, not a slow roll) minimizes much of the effectiveness issues experienced by the ailerons especially at low airspeeds and high load factors when the wings are generating a fair amount of lift. Anytime you want to maximize the roll rate, unloading will achieve this. The exact point where the rate is maximized by unloading will vary from aircraft to aircraft but basically the rule still applies. Dudley Henriques Thanks! |
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