- Jul 29, 2005
- Orange County, California
The issue here is gravity. In a turn, the acceleration is obvious, because there is no constant force imposing an acceleration in the horizontal plane. Vertically, it's a different story. An airplane is, in level flight, already accelerating at 32 ft/sec^2. While we call that "unaccelerated" in the pilot community, that's yet another case where we and the FAA get the facts completely wrong: the acceleration is not zero, it's actually 1g. In a climb - even a constant-rate one - the aircraft is accelerating vertically at a higher rate. If that weren't true, it wouldn't be climbing. The "g" loading is therefore higher than 1g, and that's the very definition of accelerated flight, even on the FAA's substandard terms.Sure it is, if you're climbing at a constant airspeed and constant climb rate. But yes, it takes more thrust (power) to offset the fact that the gravity vector is no longer perpendicular to the direction of flight. But that's not the same thing as acceleration, which is defined as a change in velocity.