Which statement about helicopter fuel use is correct?

Which statement about helicopter fuel use is correct?

• A. Ground taxiing uses less fuel than hover taxiing
• B. Ground taxiing uses more fuel than hover taxiing
• C. Hover taxiing uses less fuel than ground taxiing
• D. Both use equal fuel

Answer: (A)

The key idea is that fuel use follows the power required from the rotor. In hover taxiing, the rotor must produce lift equal to the helicopter’s weight to keep it in the air, plus thrust to move, which demands a lot of engine power. In ground taxiing, the helicopter is supported by the landing gear, so the rotor doesn’t have to generate as much lift; the engine mainly powers the rotor to keep it turning at a safe speed and to overcome drag and wheel friction. That reduced power need means lower fuel consumption, making ground taxiing use less fuel than hover taxiing.

The key idea is that fuel use follows the power required from the rotor. In hover taxiing, the rotor must produce lift equal to the helicopter’s weight to keep it in the air, plus thrust to move, which demands a lot of engine power. In ground taxiing, the helicopter is supported by the landing gear, so the rotor doesn’t have to generate as much lift; the engine mainly powers the rotor to keep it turning at a safe speed and to overcome drag and wheel friction. That reduced power need means lower fuel consumption, making ground taxiing use less fuel than hover taxiing.