Elementary holicopter question

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In a helicopter without a tail rotor, the main rotor's rotation would cause the body of the helicopter to spin in the opposite direction due to torque. This effect is similar to how a power drill operates when its bit is stuck, causing the entire drill to rotate in the opposite direction. While the helicopter is on the ground, friction prevents the body from spinning until it lifts off. If the engine continues to provide energy, the body will eventually rotate in the same direction as the rotor. The discussion highlights the principles of torque and friction in helicopter mechanics.
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If there's no tail rotor, Will the body of helicopter naturally turn along with the main rotor (in the same direction) or spin toward the opposite direction. Thanks! $15 bet with my friend ><
 
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zyenge said:
If there's no tail rotor, Will the body of helicopter naturally turn along with the main rotor (in the same direction) or spin toward the opposite direction. Thanks! $15 bet with my friend ><

What do you think will happen and why? We have no way to know if this is a homework problem or not. The answer is pretty easy to figure out, and even to demonstrate (without a helicopter).
 
My friend think that----
the engine will turn the helicopter blade in one direction and the body of the helicopter in the opposite direction. The body will not rotate until it has left the ground, because it has friction with the floor. Also the body will spin with a rotational speed proportional to the mass of the body to the blades.I think if there's no engine which is no energy input, he may be right. But with continuing energy input, it's not a closed balanced system, energy makes blade spin, then while blade is spinning, the body of helicopter should rotate along with the rotor (same direction).
 
zyenge said:
My friend think that----
the engine will turn the helicopter blade in one direction and the body of the helicopter in the opposite direction. The body will not rotate until it has left the ground, because it has friction with the floor. Also the body will spin with a rotational speed proportional to the mass of the body to the blades.


I think if there's no engine which is no energy input, he may be right. But with continuing energy input, it's not a closed balanced system, energy makes blade spin, then while blade is spinning, the body of helicopter should rotate along with the rotor (same direction).

Sorry buddy. Ask your friend if he has a preference of bill denominations that he'd like his reward in.:-p
 
DaveC426913 said:
Sorry buddy. Ask your friend if he has a preference of bill denominations that he'd like his reward in.:-p

Agreed.
 
I'll elaborate.

The engine's torque drives the propellor and the fuselage in opposite directions; the engine does not care which end is the fuselage and which end is the rotor, its purpose is only to rotate its axle relative to its body.


Try firing up a power drill when its bit is embedded in something. Instead of the drill bit turning clockwise, the whole drill turns counterclockwise, and might twist your arm off.
 
In the same direction of course because of friction dragging the heilo body along. I think:confused:
 

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