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Charlie and Ernest,
The attached plot is from Doug Dempsey's presentation at Paducah in 2010. There was no wideband O2 sensor instrumentation in the system.
Steve
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From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Ernest Christley [echristley@att.net]
Sent: Wednesday, May 16, 2012 9:15 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Why Apha N?? : [FlyRotary] Re: With great power comes...the ability to muck things up
The most efficient mixture with half throttle will produce about half the power of the most efficient mixture with full throttle. The mixture is no more powerful, but there is more of it. There is more fuel being injected...twice as much, but there is also twice as much air.
The target AFR up to full throttle is not just about efficiency. Keeping the EGT low, noise down and exhaust clean are also considerations.
That said, I too would be interested in any data Steve has. Adjusting the target AFR is fairly easy once I have a running system.
>Hi Earnest,
>
>I don't want to (mis)quote Steve Boese, but I think he did some research
>on the most efficient point to run the mixture, & I think it was
>something near 50 degrees lean of peak. Leaner meant less fuel
>efficiency. (Steve?) Does that conflict with what you're planning? It
>sounds like you could be running at much leaner than that in some
>situations, and there doesn't seem to be a provision to vary rpm while
>maintaining the most efficient mixture point.
>
>Am I missing something?
>
>Charlie
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