herky400M Posted January 7, 2016 Share Posted January 7, 2016 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 installation effect? measurements? other influences? weather, wind, humidity ...... thx for coop, bob Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted January 7, 2016 Share Posted January 7, 2016 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 Quote Link to comment Share on other sites More sharing options...
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