Definition
Forced induction systems are engine components that compress the incoming air before it enters the cylinders, raising the air's pressure and density above what the engine could draw in on its own. The two main types used in aircraft are turbochargers (driven by exhaust gases) and superchargers (driven mechanically by the engine). By packing more air into each cylinder, these systems allow the engine to maintain sea-level power output at higher altitudes where the air is naturally thinner.
Plain English
A system that squeezes more air into the engine than it could pull in by itself, so the engine keeps making strong power even when flying high where the air is thin.
Context Anchor
Seen in engine and induction-system discussions, especially when learning how turbocharged or supercharged aircraft engines maintain power at altitude.
Derivation
Forced' because the air is pushed in under pressure rather than drawn in naturally, and 'induction' from the Latin inducere, meaning 'to lead in' — describing how air is led into the cylinders. The name simply contrasts these systems with normally aspirated engines, where the engine relies on the suction of its own pistons.
Why Pilots Care
They allow the engine to maintain rated power at higher altitudes, raising service ceiling and improving climb performance in normally aspirated aircraft.
Grounding Statement
As the airplane climbs into thinner air, a forced induction system helps pack more air into the engine so the engine can keep producing useful power.
Intuition Check
Forced does not mean an emergency or a forced landing here. It means the intake air is being pushed into the engine under pressure instead of only being drawn in naturally.
Example Sentence 1
Because the aircraft has a forced induction system, the pilot was able to maintain full rated power while cruising at 16,000 feet.
Example Sentence 2
Understanding forced induction systems explains why some training aircraft can operate efficiently at mountain airports while others cannot.