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From: <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: P Porting template?
Date: Fri, 10 Nov 2006 9:37:54 -0500
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> 
> From: "Richard Sohn" <unicorn@gdsys.net>
> Date: 2006/11/10 Fri AM 11:25:55 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: P Porting template?
> 
> 
> ----- Original Message ----- 
> From: "Bulent Aliev" <atlasyts@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, November 09, 2006 5:40 PM
> Subject: [FlyRotary] Re: P Porting template?
> 
> 
> >
> >
> > On Nov 9, 2006, at 10:21 PM, Richard Sohn wrote:
> >
> >> Have been running the one rotor on p-port for a while. Aiming for  115hp 
> >> per rotor on 12A housings at 7500RPM(be happy with 100hp in  the end). 
> >> These estimates should give 150hp for 13B housings, more  likely 130, 
> >> making 260 for a 13B. I know this is worse than other p- port proponents 
> >> predict, but this is what I am working toward. If  more power (over 
> >> stock) is the issue, p-port is the solution, also  simplicity. I have not 
> >> found any real negatives, for air craft use,  in it.
> >>
> >> Richard Sohn
> >> N-2071U
> >
> > Sounds tempting, Richard. There was a big discussion about the  throttle 
> > control with PP. What is the best way to control it?
> > I'm working on a heat shield on my new muffled exhaust. The other  night 
> > at full throttle, it was spitting a 3' long flame like a jet.
> > Scarry. For some reason my EGT went to 1800+ and the mixture bar 
> > disappeared from the display? Richened the mixture and it came back.
> > Looks like I had a severe lean situation?
> > Buly
> >
> > Buly,
> 
> I think you are referring to the idle issue, which may be influenced with 
> the throttle location. This depends on what idle speed you need. The single 
> rotor idles at about 1200RPM sort of ruff. If I have a good idle at 1600RPM, 
> it is good for my airplane. That is because my prop is running at 2000RPM 
> max-600RPM at idle at this time with the SOOB. With the single, it will run 
> at 500RPM at 1600 idle, or even less if I get the right gear ratio.
> On a fast airplane it is a different story. However, what are you fast 
> drivers idling at now?
> 
> Richard Sohn
> N-2071U
> 
> 

With my electric Ivo Prop and 2.17 redrive I can idle at 1500-1600 fine. With the 2.81 will be even better.
Buly