N speeds

NF free turbine speed
NG gas generator speed
NP power turbine speed
NR rotor speed

N1, N2, N3

Spool speed expressed in percent rpm. N1 on a turboprop is the gas producer speed. N1 on a turbofan or turbojet engine is the fan speed or low pressure spool speed. N2 is the high pressure spool speed on engine with 2 spools and medium pressure spool on engines with 3 spools with N3 being the high pressure spool.

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One response to “N speeds”

  1. gav
    gav
    October 16, 2009 at 10:34 am |

    I would like to know what the N stands for in the N speeds, why was N specifically used for the prefix?

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