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Why do we monitor N2 speed rather than N1, when starting jet engine?

All correct answers here, N1 is the large fan at the front and suffers the same effects as turbo lag in a car. N2 does the main compression of the air before it enters the multistage combustion ...
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2 votes

Why do we monitor N2 speed rather than N1, when starting jet engine?

The N2 shaft is the actual jet engine proper, which has one job: turn fuel into thrust directly. It is akin to the crankshaft on a gas/diesel engine. The N1 shaft is an extra turbine put in the ...
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18 votes

Why do we monitor N2 speed rather than N1, when starting jet engine?

If it's a turbofan, N2 represents the core engine compressor/turbine spool that is creating the compress/burn/expand energy that drives the fan, and is exposed to the most energy, that is, velocity ...
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How does the F-16 engine startup work?

The START switch routes pressurized hydraulic fluid inside two canisters to the HSM (hydraulic start motor). This motor begins to spin up the JFS (Jet Fuel Starter, a small turboshaft engine) through ...
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