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From: Steve Brooks <prvt_pilot@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Remove Turbo
Date: Wed, 14 Jun 2006 12:23:17 -0400
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On Wednesday 14 June 2006 11:32 am, David Leonard wrote:
Hi Dave,

I can relate to the cooling issue.  I have the same problem under high boost, 
being that thing can heat up pretty quickly.  Especially if it is 90+ degrees 
outside.

While it doesn't make sense to try to have sufficient cooling for climb, I 
think that I can still make some air flow improvements and get a little 
better cooling.  Everything is great when the OAT is less than 70 degrees 
everything is fine.  As temperatures go into the 80's and 90's though, 
cooling becomes much more of an issue still.

Steve

> Steve, you are right - the turbine wheel had broken off already so I just
> removed it, disconnected the oil and water lines, re-routed the intake to
> avoid the compressor section, and then I went flying.  The entire
> conversion took 2 hours in someone else's hangar.
>
> But I was just doing a temporary fix until I could upgrade the turbo.  I
> flew in that configuration for about 50 hrs and had very few problems
> except for that my power was not up to par.  I guess I was only making
> 130-140 h.p. The issues were:
> 1)low compression rotors
> 2)exhaust back pressure because of the turbo manifold and turbine housing
> 3)poor compression in one of the rotors that I never really appreciated
> until I installed a re-build.
> 3)intake resistance (peak MAP at WOT was just over 27") because the intake
> was not optimized nor did it have a proper pressure recovery plenum.
> 4)Because of all that I now had too much prop, max RPM at WOT (in
> flight) was about 5500, I only had 4500 for take off.  I basically put it
> to full throttle on take off, and it never changed it.  Level TAS at WOT
> was about 145 kts at 5K'.
>
> I have about 40 hrs on the new turbo (TO4 in a stock turbine housing) and
> it still looks pristine.  I try to keep it under 38" but have had it up to
> 45.
>
>
> I can only cool about 28" continuously so that is a sort of normalization
> if you want to look at it that way.
>
> Dave Leonard
>
> On 6/14/06, Steve Brooks <prvt_pilot@yahoo.com> wrote:
> > Buly,
> > With your engine, removing the turbo makes sense.  You can probably get
> > enough
> > horsepower with the NA setup.
> >
> > In my case, with a lower compression turbo engine, I'll have to stick
> > with the
> > turbo to get enough power.
> >
> > I have about 42 hours now on my already used stock turbo, with no
> > problems.  I
> > have been nursing it along though, and don't exceed 5-6 lbs of boost on
> > takeoff, and usually fly at 0-2 lbs of boost max.  Sometimes I cruise
> > around
> > at less power than that to conserve fuel, if I'm just flying around.
> >
> > I do think that the stock turbo is going to fail, and I have all  of the
> > parts
> > to convert to a T04 turbo, which appears to be the best long term turbo
> > solution.
> >
> > As I recall, when Dave had his turbo trouble, he gutted the turbo, and
> > still
> > used his same exhaust system.  Is that what you did, or did you redo your
> > exhaust ?
> >
> > Steve Brooks
> >
> > On Tuesday 13 June 2006 11:21 pm, Bulent Aliev wrote:
> > > On Jun 13, 2006, at 10:13 PM, John Slade wrote:
> > > > Joe, Buly
> > > > I think the bottom line on my "escapades" is that the stock turbo
> > > > just isn't up to the task. So far I have about 25 hours on my T04
> > > > Turbonetics + external wastegate setup with zero problems. The
> > > > engine is purring very smoothly these days. Just a matter of using
> > > > the right tools for the job.
> > > > John
> > >
> > > Just came from the hangar. Managed to convert the engine to NA in 3
> > > hours. Didn't run it since it was almost 11PM and I was missing one
> > > plug for the cooling port for the turbo.
> > > While doing it, I opened up John's old stock turbo that he imported
> > > from NZ. Many of the turbine blades were missing chunks.
> > > That convinced me that it was the right thing to do. At the moment
> > > I'm not up-to spending another 2G's for a T4 turbo after I just spent
> > > $2,400 for a prop. Hope I'm able to spin the prop to the static RPM
> > > needed? The good part is I can convert it to a 2 blade fast :)
> > > Buly
> > >
> > > --
> > > Homepage:  http://www.flyrotary.com/
> > > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >
> > --
> > Homepage:  http://www.flyrotary.com/
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