Definition
A condition of flight in which the aircraft maintains a constant airspeed and a constant flight path, with no change in direction or speed, so that the only load acting on the airframe and occupants is normal gravity — a load factor of 1G.
Plain English
Flying straight, level, and steady, with no turning, climbing acceleration, or pulling up — so the airplane and everyone in it feel their normal weight, nothing more.
Context Anchor
Seen in stall discussions when comparing the normal stall speed to stall speeds in turns, pull-ups, or other higher-load situations.
Derivation
‘Unaccelerated’ literally means ‘not accelerating.’ In physics, acceleration includes any change in speed or direction, not just speeding up. So unaccelerated flight means the aircraft is neither speeding up, slowing down, nor changing direction. ‘1G’ refers to one unit of normal Earth gravity — the everyday weight you feel standing still.
Why Pilots Care
Sets the baseline stall speed; any turn or pull-up raises stall speed by increasing load factor.
Grounding Statement
Picture straight, steady flight where you feel your normal weight in the seat, not pressed down harder and not floating lighter.
Intuition Check
Do not read “unaccelerated” as only “not speeding up.” In aviation, a turn is accelerated flight because the airplane’s direction is changing, even if the airspeed stays the same.
Example Sentence 1
The published stall speed in the POH assumes unaccelerated flight at a 1G load factor, so expect a higher stall speed in a steep turn.
Example Sentence 2
The pilot maintained unaccelerated flight by holding altitude and airspeed constant before practicing a power-off stall.