only if the plane was on a conveyer with a rope attached to the helicopter

 

are you in the airforce or something?

 

Then he should know this h:

 

i am actually thinking LT may be helpful, if he knows this

can the rear rotors only, as in no lift at all, can they overcome the friction of the body with the ground and rotate the helicoptor at a standstill?

if the body rotates the top rotor at X rpm relative to the body
the record rotates both the body and the top rotor at -X rpm relative to the ground
then the top rotor will rotate at 0 rpm relative to the ground

if the rear rotor can overcome the friction of the body and the record then it can slow the rotation of the body and top rotor
thus the top rotor would have a positive rotation and would create lift and takeoff

 

if this was a serious scenario the helicoptor will take off. the wind velocity the propeller creates is independent of the speed at which the disc is spinning.

 

THANK YOU!

sheesh someone gets it.

 

I'm not always dumb.

 

wrong h:

they are not independent

the record moves the body of the heli at X rpm
this also moves the blade at X rpm
they are connnected by a driveshaft, it isnt free floating like a wheel on a plane

the rotor moves in relation to the body of the heli, if this rotation is the same as the rotation of the record player on the body then the rotor moves 0 rpm in relation to the ground

the difference here is that the rotor is affected by the record player, whereas with the plane the conveyor didnt affect the engine at all just the wheels

 

let me elaborate/correct myself, the disc do affect it, but even if the disc is spinning at the same rpm as the propellers, the propellers creates a wind velocity that still will cause it to lift off.

 

if the record moves the helicoptor at a rate of -X rpm
then the helicoptor moves the rotor at -X rpm
and if the engine moves the rotors at a rate of X rpm
then in relation to the ground the rotors are moving at 0 rpm

thus no airflow and no lift
something has to slow down the rotation of the body on the record player for it to gain any rotation relative to the ground to create lift