Helicopter Definition and 205 Threads

Can a helicoptor, considering its primary and secondary rotors, ever generate exactly zero torque, i. e., while hovering? The secondary compensates for the primary's torque, but what compensates for the secondary's torque? Is there such a thing as or a need for a tertiary rotor?

Is there any website or reference for a beginner guide to Helicopter Aerodynamics?

We have a helicopter flying and use the power "P" to keep it in equilibrium. But if the scale was greater n times, what would be the power to keep it there?

can someone give me the formula needed to work this problem? A 4655-kg helicopter accelerated upward at 8 m/s2. What lift force is exerted by the air on the propellers?

Helicopter "Attacks" Wiltshire, England: Earthfiles.com http://www.earthfiles.com/news/news.cfm?ID=575&category=Environment