Re: [COUPERS-TECH] What RPM is 75% power?

[Scott Morgan]

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Thanks to all for the quick replies. GEEEZ, I feel like such a dope. I should have referred to the POH before

asking the question. This proves how much I know!! I have always felt real good about flying if I had oil pressure, the prop was turning, I have engine noise and the plane is not vibrating out of control and beyond that I am pretty dumb.  Thanks all.  Scott

Scott Morgan <[EMAIL PROTECTED]> wrote:

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Coupers, I have a McCauley CM 7150, IB 90 prop mounted on a C-90 with 100+ hours

 since major overhaul. 2400 to 2450 Rpm seems to be the max I can get out of this setup.

This is all mounted on a 1967 A2-A. When people refer to fuel consumption as being so many

gallons per hour at 75% power , what do they mean?

 

If I take 75% of 2400, I get about 1800 RPM. If I flew at 1800 rpm my fuel consumption

would be about 4 gph or less.  However, this would not do the engine any favors, I'm sure.

 

So, my question is what do they mean, 75% power???

 

Scott

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