(a) Why do most small helicopters have a rotor on their tail (Fig. Q9.17)? (b) Many large...

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(a) Why do most small helicopters have a rotor on their tail (Fig. Q9.17)? (b) Many large helicopters have two large rotors. Why do these helicopters not need a tail rotor? Do you think the two large propellers rotate in the same direction? Explain.


Figure Q9.17

CHARGERS NAVY

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