Piston engine · Question 9 of 12
In an aeroplane with a fixed-pitch propeller you pull the carburettor heat; there is no ice. What does the tachometer show?
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Answer
- C The RPM drops slightly and stays lower
Explanation
Warm air has a lower density, the engine receives less air mass, and the mixture becomes richer. Power and thus RPM drop slightly. Without ice the RPM stays at the lower value until the carburettor heat is closed again.