| 摘要 |
A radio controlled helicopter is provided which eliminates or simplifies forward/reverse flight control for safe and easy indoor operation. Embodiments include a helicopter having a pair of counter rotating rotors which are driven at the same speed, a vertically aligned tail rotor driven by a reversible motor for controlling yaw, and a mass, such as a power supply battery, mounted for changing the center of gravity of the helicopter to adjust the tendency of the helicopter to move in a forward or reverse direction. The mass is either rigidly mounted, so that the helicopter is always moving forward during flight, or adjustably mounted so that the helicopter's forward or reverse direction can be adjusted prior to or during flight. A protective cage is provided to protect persons from injury from the rotors and to prevent damage to the rotors due to contact with objects during flight.
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