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Join Date: Aug 2000
Location: S Warwickshire
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You're right in suspecting that it is not very meaningful.
Early in the design process they set a nominal design point for the fan (3900 rpm for an RB211-22/524).
This allows instruments to be standardised with % values, but the actual limits in % terms can vary even among variants of the same engine (e.g. RB211-535c to -535E4)
Early in the design process they set a nominal design point for the fan (3900 rpm for an RB211-22/524).
This allows instruments to be standardised with % values, but the actual limits in % terms can vary even among variants of the same engine (e.g. RB211-535c to -535E4)