Definition
A supercharger configuration that uses one impeller to compress the induction air before it enters the engine's intake manifold. The air passes through a single compression step, raising its pressure once before reaching the cylinders.
Plain English
The engine has one fan-like wheel that squeezes the incoming air a single time before it gets to the cylinders.
Context Anchor
Seen in discussions of aircraft engine induction systems, especially superchargers and how they help an engine make power at altitude.
Derivation
Stage comes from the Latin 'stare,' meaning to stand. In machinery, a stage is one step in a process. 'Single stage' simply means one step of compression, as opposed to two or more steps in series.
Why Pilots Care
Determines how much boost the engine receives and how well power is maintained as altitude increases.
Analogy
Think of using one pump to push air harder one time. A single stage induction system gives the air one pressure increase before it reaches the engine.
Intuition Check
Single stage does not mean one cylinder, one speed, or one part of the flight. Here, stage means one pressure-raising step in the path of air going into the engine.
Example Sentence 1
The aircraft's engine uses a single stage supercharger, so manifold pressure falls off more quickly at high altitude than it would with a two-stage system.
Example Sentence 2
Before a high-altitude flight, the pilot confirmed the induction system was single stage and planned power settings accordingly.