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9th November 2007 | 20:28

#4 (permalink)

carholme

Joined: Oct 2004

Posts: 186

Likes: 0

From: By a river

N is the symbol for speed

N1 compressor speeds also Ng
N2 free turbine speeds also Nf

Nr Rotor Speed as in helicopters

etc., etc.

Regards

carholme

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