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From: Steve Brooks <prvt_pilot@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine rpm was  [FlyRotary] Life without a turbo....
Date: Fri, 16 Jun 2006 09:03:39 -0400
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On Friday 16 June 2006 08:35 am, Bulent Aliev wrote:
Buly,

The static seems a bit low, if you are set for the finest pitch.  I have a 72" 
IVO Magnum high pitch, but without the electric adjustment.  And yes, I think 
that 72" is too big, but I haven't had the nerve to cut it down.

I get about 5100 static with the pitch set to about mid range.  I have set 
mine to fine pitch and seen 6000 static.  

I think that I'd try a little tuning to see if you can get the RPMs up some 
before attempting a flight.  Try turning your mixture control more rich, and 
and then more lean to see what it does to your your RPM. 

If you still have the turbo fuel injectors, you may need to narrow the 
injector pulse to lean it with the absence of the turbo.

FWIT

Steve Brooks


> On Jun 16, 2006, at 8:25 AM, Ed Anderson wrote:
> > ----- Original Message ----- From: "Bulent Aliev"
> > <atlasyts@bellsouth.net>
> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > Sent: Thursday, June 15, 2006 10:14 PM
> > Subject: [FlyRotary] Life without a turbo....
> >
> >> After working for a week on all the details I did tonight my
> >> first  run in NA mode.
> >> Prop is  3 blade IVO Magnum 68" electric set for take off (fine
> >> pitch)
> >> OAT 90F
> >> Right off the box without any tuning made 4900 static (2260 prop)
> >> I'm pleased, since the prop was ordered for my turbo setup. My
> >> turbo/ muffler does a very good job. The noise was very close to
> >> the one I  had with the turbo. I basically gutted the turbo and
> >> left only the  empty hot section on. Makes very compact and sturdy
> >> muffler, with  exhaust pointed exactly where I want it without
> >> modifications.
> >> John Slade tells me this static RPM is sufficient for flight. I
> >> wander what other people think? I can trim the prop also and get
> >> a  bit higher RPM. John is running 64" (same prop) with his turbo
> >> application.
> >> Buly
> >> Buly
> >
> > Buly, I have no experience with an IVO, but I do want to remind you
> > that maximum static rpm does not NECESSARILY mean you are getting
> > adequate thrust.  I recall one individual who concluded that
> > maximum engine rpm = max thrust.  He reduce the pitch until he had
> > maximum rpm, unfortunately the thrust was just enough to get him
> > airborne, but not enough to accelerate to a safe speed.  He never
> > gained altitude and  impacted a  cactus with fatal results.
> >
> > If your prop is set up similar to John's then you have a comparison
> > and assuming your bird is similar in weight, etc, then is probably
> > Ok to fly. I'd do a few taxi test and if your acceleration feels
> > strong then you are probably  generating good thrust.
> >
> > Any other "prop" guys want to advise Buly.
> >
> >
> > Ed
>
> Ed, last night I found information on another Cozy with 6 cylinder
> Subaru 230 HP, same reduction ratio and the same prop.
> At fine pitch like me, he was getting 4400 rpm and was able to get
> 2000 fpm at 80K on take-off.
> I fully intend to do fast taxi tests before flying.
> Buly
>
>
>
> --
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