----- Original Message -----
From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, August 17, 2004 2:06 PM
Subject: [FlyRotary] Re: P-P Surprise


> Richard wrote:
>
> > In developing the intake system for the one-rotor, I got some
> > surprise. When I got to the point of running both ports, side and P-P,
> > on one carb each, I tried to coordinate the cup(close-up butterfly)
> > with the carbs, there was no impact from the cup at idle or anywhere
> > else up to 3500RPM. Starting the engine with the cup full open was
> > normal. Naturally, I removed the  cup and the engine is just running
> > fine. Throttle response with the P-P carb alone is very smooth and
> > solid. Idle speed is now at 1500RPM with the mixture not optimized yet.
> > So much for the cup in my case only.
> > I what I observed here holds up, the combo port idea may be dead
> > making the one rotor a more simple and better engine.
> > This also reminded me of the NSU Wankel Spider, which did not have a
> > cup and was running very fine.
> >
> > Richard Sohn
> > N-2071U
> > unicorn@gdsys.net <mailto:unicorn@gdsys.net>
>
> As the Laugh-In Nazi used to say,"Veeelly interesting."
>
> I've been asking people since long before I got booted off the other
> list if they knew of anyone who had run a PP with electronic injection
> instead of carbs to prove that it was the PP itself causing the idle
> problem & not bad mixture & mixture distribution due to the low flow
> rate & bad tuning issues of carbs at idle. (Top *that* for a run-on
> sentence.) I always got the answer that the problem was due to overlap
> between the adjacent chambers in each rotor but no one ever said that EI
> had been tried on a PP 2rotor.
>
> Ken Powell needs stop his world traveling &  get his PP running so it
> can be proven whether it's overlap or bad induction causing bad idle.
>
> Charlie
>
I have observed in earlier tests an influence of mixture on P-P running at
low RPM and transition throttle opening. I hope I have more definite results
at S-B in October. The only thing I dare to speculate on at this time is the
posibility of 2-Stroke like behavior at idle and low RPM as far as mixture
is concerned.

Richard Sohn
N-2071U
unicorn@gdsys.net

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