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Hi Bobby, I understand you have considerable time with your engine. I'm surprised at the A/F ratio. I'm passing along the info I have received from the original Powersport guys. Of course you are supercharged right? Or did you convert to turbo? The Powersport (original) guys were always NA. Steve told me that rich of peak was just rich of stoichiometric at about 13:1. Lean of peak could go to 16:1 or more. It of course isn't an apples to apples comparison with the engine supercharged. Just an FYI comment. With the intake air heated it would certainly skew the reading.
Bill
Bill,
These setting worked best for me. I did my 8-10 hour days between Texas, Delaware, Ohio, etc with a lot of time to experiment. Of course takeoff F/A was in the 12’s and water injection at 38-40” MP unless it was really cold. No heat exchanger for the super charger. EGT under 1600F and intake temp under 140F were my targets. 93 octane usually with alcohol or 100LL.
Bobby Sent from my iPad Bobby, unless you have too much timing lead or exceptionally crappy gas it is unusual to detonate. That air/fuel ratio is rather bad place. Lean more or run rich of peak. Bill My preferred cruise economy settings 30” MP, 4800-5200 rpm. F/A 15:8 lean. Or 30-34” MP, 5200-5400 rpm F/A 14:0 or whatever was need to keep EGT below 1600F and intake air temp below 140F. Bobby From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, July 17, 2020 7:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] over square and detonation of a rotary for my pilot friend Hi people.
My test pilot friend and I are continuing our journey of extending the phase#1 envelope and now experimenting with engine settings.
With a flight adjustable prop he is asking questions about 'over square' and detonation.
Can anyone give me an answer for him?
Thanks
Steve Izett
Glasaie Super IIRG Renesis 4 port RD1C variable pitch prop.
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