Definition
A reciprocating aircraft engine fitted with a supercharger or turbocharger that produces more than standard sea-level manifold pressure on takeoff. The forced induction system raises intake pressure above ambient atmospheric pressure even at ground level, allowing the engine to develop more power than it could on naturally aspirated intake alone.
Plain English
An engine that uses a pump to push extra air into the cylinders so it makes more power than usual, even when sitting on the ground at sea level.
Context Anchor
Seen in aircraft engine and performance discussions, especially when comparing normally aspirated, supercharged, and turbocharged engines.
Derivation
‘Ground-boosted’ describes where the boost takes effect. ‘Boost’ in engine terminology means intake pressure raised above the surrounding atmosphere by a supercharger or turbocharger. ‘Ground’ here means the engine is already being boosted while still on the ground — not waiting until altitude — which distinguishes it from engines that only use forced induction to recover sea-level power as they climb.
Why Pilots Care
Provides increased takeoff power and improved initial climb performance, allowing higher gross weights or shorter runway requirements while still respecting engine limits.
Grounding Statement
Picture the engine getting a stronger push of air for takeoff, but not being built mainly to keep that same advantage as the airplane climbs high.
Intuition Check
Ground-boosted does not mean the engine is boosted by ground equipment. It means the engine’s intake air is boosted for added power near the ground or at low altitude.
Example Sentence 1
The aircraft’s ground-boosted engine produced 40 inches of manifold pressure on takeoff, well above the 29.92 inches available to a naturally aspirated engine at sea level.
Example Sentence 2
Because the engine was ground-boosted, full power was available even at sea level without waiting for ram effect in flight.