Can anyone tell me why this quad-rotor needs to have 3 gyroscopes?
Conventional helicopters (main rotor and tail) need only 1.

Why this needs three?
All quadrotors need 3 gyros?

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Conventional Helicopters have a 2 dimensional gyroscope directly mounted to the main rotor. Called a flybar, or main rotor, it spins, has weight, and contributes to in-flight stability.

Quad-rotors get very little inherent stability from their spinning parts. - so they make up with 2 additional dimensions of electronic gyroscopes.

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