A helicopter is loaded near its forward center-of-gravity limit. What flight condition is this loading most likely to adversely affect?
- AThe ability to maintain level flight at high cruise airspeed, due to insufficient forward cyclic authority
- BThe amount of tail rotor thrust available for anti-torque control at high power settings
- CThe ability to achieve a nose-high attitude during hovering autorotation or a landing flare, due to insufficient aft cyclic authority
- DLateral control during sideward flight, due to insufficient left cyclic authority
Show answer & explanationAnswer & explanation
Correct answer: C. The ability to achieve a nose-high attitude during hovering autorotation or a landing flare, due to insufficient aft cyclic authority
With a forward CG, the nose tends to pitch down, requiring the pilot to hold more aft cyclic just to maintain a level attitude or hover. This uses up available aft cyclic travel, so less remains for maneuvers that require additional aft cyclic, such as flaring during autorotation landing, potentially resulting in a nose-low, high-speed touchdown.
Why the other options are wrong
- A. An aft CG condition, not forward, restricts forward cyclic and high-speed flight capability.
- B. CG position along the fore-aft axis does not directly limit tail rotor thrust availability.
- D. Lateral CG issues affect left/right cyclic authority, unrelated to a fore-aft CG limit.
Forward CG Flight Effects
A forward center-of-gravity loading requires more aft cyclic to maintain attitude, reducing the aft cyclic reserve available for maneuvers like the autorotation flare.
- Forward CG causes a nose-low tendency
- Pilot must hold more aft cyclic to compensate
- Less aft cyclic remains available for flare/hover
- Aft CG has the opposite effect, limiting forward cyclic and high-speed flight
Memory trick: Forward CG eats your aft cyclic 'savings account' before you need it to flare.