This doesn’t respond directly to the point, but one data point I have from the dyno runs on my 20B is 5100 rpm; 100 – 125 lean of peak, not WOT – about 23.5 MAP gave a BSFC of 0.49.  It was putting out about 150 hp at that point. I was trying to guess cruise conditions, but didn’t know what they would be.

 

My typical altitude cruise is about 5500 rpm, 19 - 20” MAP, about 100 lean of peak, about 125 hp and 10 GPH. That’s right about the .49 BSFC; and that’s kool cuz at 10,000 ft that gives me 165+ KTAS in a comfortable 4- place airplane.

 

Al

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ernest Christley
Sent: Friday, July 09, 2010 11:53 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dyno

 

Ed Anderson wrote:

> 

> There is no question that if you vary the Air/fuel ratio by using the

> mixture control for a set air flow - you will vary power being produced.

> 

 

The question that really interests me, and the one that could only really be answered on a dyno, is "Could you get the

174 Hp generated by this engine at 5500 RPM, but with a BSFC closer to .40, by controlling power in this way?"

 

--

Homepage:  http://www.flyrotary.com/

Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html