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John,
Another question or two.........Does your TO4 have anything exotic
such as inconel exhaust turbine or ceramic bearings , etc ??.........
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Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from John Slade <sladerj@sbcglobal.net>: --------------
I'm here, Kelly. I'm not doing a lot of flying lately, but the T04 turbo seems unchanged in 50 hours, other than the pretty ceramic coating that came off in the first 2 hours. Its a Turbonetics T04E-50 big shaft tangential with P trim, wet housing (i.e it has coolant galleries), an aspect ratio of 0.96 and a TiAL Sport 46mm vacuum controlled wastegate. I have to fly on the coolant gauge until I get up to speed and cooler air, but that's fine with me. I'd rather have it that way than have a draggy airplane. Even holding back on the throttle I have much better performance that an I0360.
I flew her for an hour last weekend. No problems.
John
Kelly Troyer wrote:
Dave and All,
Have not heard from John Slade lately about his new turbo
but if I were a guessing man I would guess that it is going to take
a full blooded TO4 (like his) or equivalent to stand up to the
Rotary's hot breath for the TBO that we would like........ Jump in
here John and bring us up to date on your turbo and run the spec's
on yours cross here again.........
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "David Leonard" <wdleonard@gmail.com>: --------------
yup on both counts.
Dave
On Fri, Jun 20, 2008 at 9:14 PM, Mike Wills < rv-4mike@cox.net> wrote:
Dave,
Stating the obvious, that sucks. I assume you run synthetic oil? Is the center housing water cooled?
Mike Wills
RV-4 N144MW
----- Original Message -----
Sent: Friday, June 20, 2008 8:47 PM
Subject: [FlyRotary] Another Turbo Bites the dust
Today I flew from San Diego to Brownville Texas to attend a formation flying clinic. After 6 hours of WOT flight I was descending through 5000' (down from 15.5k) an just a few miles from the airport when I had a sudden and sickening drop in manifold pressure. The engine was still running fine, and I had plenty of altitude to make the runway, so I continued on debating weather or not to flip the turbo oil shutoff switch. I had grown to respect this turbo so much that I finally decided that I had just blown out a fitting somewhere in the intake system downstream of the turbo. I even continued on to a low pass for show rather than just landing. When I eventually had time to take off the cowl I was dissapointed to find that all the fitting were in place and that the compressor wheel turns only with significant resistance.
So the turbo is dead, and I am out of the formation clinic and will have to decide tomorrow about flying home with a dead turbo. Will maybe be able to take a look in the hot side and see what I see.
This turbo was the TO4 hybrid with a fixed wide open waste gate. It had 130 hrs of mostly hard duty. Sigh.
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David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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