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