A RC helicopter is placed on a circular platform that can rotate freely about it

Question

A RC helicopter is placed on a circular platform that can rotate freely about its center axis. i) Explain with a diagram what forces are acting on the helicopter as it is sitting on the platform ii) The helicopter has two helices, a large one mounted on its top with a vertical axis, and a smaller one mounted on its tail with a horizontal axis. The large helix is turned on to some low speed, describe what happens and why the helicopter is still sitting on the platform iii) The small helix is then turned on, why? Explain with a diagram what forces are involved iv) What do you do to lift the helicopter up, explain what is the agent that lifts it up, what Newton

Explanation / Answer

Part i:

Vertical axis (+y) Vertical axis (-y)

Normal Force Weight Force (air force is minimal)

Part ii:

The buoyancy force is not enough to raise the helicopter, because of helicopter's weight.

Part iii:

It is to keep the helicopter stable in the air. It allows to the helicopter to rotate about its vertical axis, providing steering control.

Part iv:

Apply force to accelerate the helice. Using Newton's third law, you can understand how to get a helicopter its buoyancy. The helice are keyed to force down the air particles (action) and the air force to turn the helice up (reaction)

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