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Maximum continuous N1
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   P210 Silver Eagle -> EngineMessage format
 
lmamane
Posted 2019-02-08 12:31 PM (#2217)
Subject: Maximum continuous N1


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Posts: 35
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Location: ELLX

Rereading my POH, I noticed that it specifies on page 2-3, a maximum continuous N1 of "85% - 94%".

  1. This is not marked on our N1 instrument! On page 2-6, the POH specifies a "green arc normal" of 60 to 105%. This is not coherent. If the range 94% to 105% is "takeoff maximum (5 min)" it should be yellow.
  2. Thinking what the yellow range should be, I'm not even sure. Is the maximum 85% or 94%? Or something in between that depends on temperature, pressure altitude, ISA deviation, phase of the moon, or whatnot?
Anybody has something to say about this?


Edited by lmamane 2019-02-08 12:31 PM
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Georg Kraus
Posted 2019-02-09 6:00 AM (#2219 - in reply to #2217)
Subject: Re: Maximum continuous N1



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I have 94-96 depending on altitude. I never heard that there is a limitation below 105. I will ask Bob...
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lmamane
Posted 2019-02-11 9:44 PM (#2220 - in reply to #2219)
Subject: Re: Maximum continuous N1


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Posts: 35
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Location: ELLX
I asked Griggs. They say the Rolls Royce manuals for the engine don't contain any limitation on time at 105% N1 and "really don't know what why that max continuous number from 85-94 is in the POH or where it came from". So it looks like we can disregard this 85-94 from page 2-3.
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Georg Kraus
Posted 2019-02-12 2:30 PM (#2221 - in reply to #2220)
Subject: Re: Maximum continuous N1



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Location: EDRY
yes, that is correct. In fact you can't influence N1. Typically the value is between 94 and 96. But there are also engines with 100 or 105%. The tighter the engine...the higher N1...the more power you have :-)
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