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From: "Steve Brooks" <prvt_pilot@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Two blade Ivo
Date: Sat, 15 Jul 2006 08:08:31 -0400
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Importance: Normal

Buly,
I know that the turbo is pretty restrictive, and you're right about the
casting.  I think that it weighs about 30 lbs, as I recall.

The way you are doing it though, is faster, because you don't have to modify
your exhaust.

There are some SS T04 manifolds available that could just be used to replace
the stock manifold, and bolt a muffler to it.  I have one for my T04
conversion, if I end up going to it.  I may just do away with the turbo,
depending on how your tests go.  It would be nice to shed 30 lbs or so back
there, and not have to worry about the turbo failing, or getting rid of the
extra heat.

Steve Brooks
Cozy MKIV
Turbo 13B - 42.8 hours


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Bulent Aliev
Sent: Friday, July 14, 2006 4:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Two blade Ivo


I did some more static engine testing today. Mounted an electric leaf
blower in front of my P-51 style scoop to force air in the radiator
and oil cooler. Warmed up the engine to 125F and did the "auto tune
magic". I'm not quite sure if i was doing it right, But the high-
power test later gave me 5750 rpm static (2650 prop) That's 250 rpm
more than last night before the tuning.
During the test I had a visitor. The guy that rebuilt my engine came
buy and said that my turbo-exhaust is very restrictive and I should
go in to 2 in one pipes and get rid of the heavy turbo castings. Took
me to his race 12-B that's set up for 9-10,000 rpm. It is across the
street in a aircraft muffler shop and showed me his race manifold.
Looks like there are couple of hundred rpm to be gained from the
exhaust change?
I remembered George Graham uses straight out flexible SS tubes
without a muffler and his engine does not sound bad. Also it is 8
feet behind me and points away from the cabin. this weekend may try
to get it airborne again?
Buly

On Jul 13, 2006, at 9:28 PM, Bulent Aliev wrote:

> Today I had a chance to test my 2 blade 68" diameter Ivo Magnum
> electric prop at fine pitch about 50". With 3 blades I was getting
> 4700 (2160 prop) rpm static (2.17 drive). Two blade gave me 5500
> static. About 2500 at the prop.
> For some reason today, at low rpm the engine was surging up and
> down, but it was getting dark and I did not do any trouble shooting.
> Bulent "Buly" Aliev
> FXE Ft lauderdale, FL
> http://tinyurl.com/s5xw8
>
>
>
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
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