Post by Br. Marius on Apr 10, 2015 17:40:19 GMT
Justify the following:
(a) Let us feel the "tennis racquet effect" on the tennis ball. To give a counterclockwise spin to the deflected ball, how should the racquet be tilted?
(b) A lag frequency of .8 to 1.4/rev is avoided.
(c) During the wind tunnel testing, one pitch link broke and there was a lot of shaking of the model. If you were the test engineer, what would you do immediately?
(d) If the pitch axis lies on the cg axis, there is no structural coupling between flap and pitch motions, but in reality, these motions are coupled.
(e) A small offset of cg from feather axis may have a negligible influence on flap mode, but that may not be the case with torsion mode.
(f) A fan diagram shows a narrow range of operating speed (rotation).
(g) δ3 can be beneficial from gust point of view.
(h) Generally it is possible to achieve matched stiffness condition only with soft lag rotors.
(a) Let us feel the "tennis racquet effect" on the tennis ball. To give a counterclockwise spin to the deflected ball, how should the racquet be tilted?
(b) A lag frequency of .8 to 1.4/rev is avoided.
(c) During the wind tunnel testing, one pitch link broke and there was a lot of shaking of the model. If you were the test engineer, what would you do immediately?
(d) If the pitch axis lies on the cg axis, there is no structural coupling between flap and pitch motions, but in reality, these motions are coupled.
(e) A small offset of cg from feather axis may have a negligible influence on flap mode, but that may not be the case with torsion mode.
(f) A fan diagram shows a narrow range of operating speed (rotation).
(g) δ3 can be beneficial from gust point of view.
(h) Generally it is possible to achieve matched stiffness condition only with soft lag rotors.