Torque tube
From RC Helicopter Wiki
An alternate means of driving a tail rotor from the heilcopter's main motor. Rather than a tail belt, a torque tube equipped helicopter uses a carbon fibre tube or wire drive mounted on the inside of the tail boom with gear sets on each end to drive the tail rotor. Torque tubes generate less drag on the motor than a belt and is more durable in normal operation. A torque tube system is less tolerant of boom strikes or anything that stops the tail rotor from spinning, and tends to strip gears in a crash.
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