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PostPosted: Tue Feb 25, 2014 1:36 pm 
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In tandem helicopter, wt is the most appropriate attachment point for the sling load and what is the optimal length of the cable? Also, how lift is generated by 2 rotors and hows it depends on CG position?

I have been looking at these in internet, but really cant find much information. Could any one can help me? Thanks a lotttt



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PostPosted: Wed Feb 26, 2014 11:18 pm 
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Sling load is always at the aircraft center of gravity.

The optimal length of cable depends on how tall the trees are. The cable must be longer.

The rotors produce lift same as any other helicopter. Collective up increases the pitch on each rotor system, and you go up. Cyclic fore and aft tilts the rotor disc in the direction you want to go, and the airframe gets dragged along for the ride. (I believe on the Vertol, only the rear disc tilts, but I could be wrong. Haven't worked on one.)

The rotors spin in opposite directions to offset each other's torque, so you don't need a tail rotor.



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