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power performances T56-A-15 LFE (Serie III)


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first of all I wish the whole community a nice and healthy 2016 ;)

A question,

related to the power performance; what is the difference between

  • a bare engine on a test stand
  • an engine in a nacelle on a test stand
  • an engine on wing
  1. installation effect?
  2. measurements?
  3. other influences? weather, wind, humidity
  4. ......

thx for coop, bob

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Hi Bob, prosperous 2016 to you also.

 

Engine (power package) on test stand or aircraft match up within 1%, i.e. 98% on test stand will be around 97% on

the wing.

 

As to running on a dynamometer, we had some engines from RollsRoyce that came with dyno sheets. I was

pleasantly surprized when the performances came in within 2%

 

As to atmospheric effects: engines on cold wet days may be awesome, but the same older worn compressor

on a hot humid day looks like it has emphysema

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