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Good call, Chris.
Give me a call when you get ready after
settling down from the move.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of candtmallory@cebridge.net
Sent: Friday, June 26, 2009 3:01
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Fwd: Re:
Engine problem/ I need help
After a
good night sleep, and talking to the wive, I've decided to pull the wings and
finish fixing the engine once I get to Fayetteville.
Every
time in the past when anyone would ask "When will you fly?" I would
answer that it will be done when it is done, and I was enjoying the
building. By putting a deadline on myself, it had stopped being fun, and
was too much like work. My wife reminded me of this while I was pissing
and moaning.
Fayetteville
puts me about 1 hour from Bruce Terrentine, and also pretty close to Ed.
With the wings off, the plane is much more transportable, and I will be able to
bring it to the experts to get help if needed.
It's disappointing, but I know that it is the right decision in the long
run. When I get to Fayetteville,
and resume work, I'll let you all know what I find as the problem.
Thanks
again for the encouragement,
Chris
On Fri Jun 26 12:23 , wrjjrs@aol.com
sent:
Chris,
One other possibility is an exhaust obstruction. Very often people
underestimate the effects of the near 1700°F exhaust of the rotary. Even
Mistral who are very aware, made the mistake of running an exhaust from an
outside manufacturer and it failed. You were making your first high-power WOT
runs and therefore hittin the super high temps for the first time. Check your
exhaust carefully give it the tap test to check for loose parts.
Bill Jepson
-----Original Message-----
From: Richard Sohn <res12@fairpoint.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Fri, Jun 26, 2009 6:58 am
Subject: [FlyRotary] Re: Fwd: Re: Engine problem/ I need help
the flames in the exhaust could also be caused by late
ignition timing. I had that a couple of years ago on the single rotor.
The engine was running fine and really smooth at about 40%
power. Suddenly, the exhaust started glowing red about 10" long. After
realizing it was the first run with a new ignition setup, I investigated and
surely found an increasing late ignition timing with increasing RPM.
After this was corrected, the problem was gone.
----- Original Message -----
Sent: Friday, June 26,
2009 7:44 AM
Subject: [FlyRotary] Fwd:
Re: Engine problem/ I need help
----- Original Message -----
From: <candtmallory@cebridge.net>
To: 'Ed Anderson' <eanderson@carolina.rr.com>
Sent: Fri Jun 26 0:07
Subject: Fwd: Re: Engine problem?
Thanks all for the quick responses!
I was reluctant to run the engine again, but it sounds like that is
what I need to do to get more data points. I'll go out tomorrow and do
some lower power runs and see what I get.
To answer some of the questions:
I have about 1.5 hours total on the engine right now. I've done
the mode 3,2,1 and 9 (auto=2 0tune). Everything looked good. With
about 1 hour engine time, I started teh high power runs. I was at about
30 min total high power time when this happened.
RD1C (2.85:1) PSRU with a huge CATO prop.
Standard Renesis Red and Blue injectors, I'll have to measure the
throttle body, the exhaust is short. It comes out and faces fron,
then turns 180 down and aft to the Hushpower II muffler, then 90 down and out
the cowl. I'll take a pic tomorrow.
I stopped the high power runs when H2O got to 200*, oil was always
about 10* cooler.
I also had to do the short runs to fill the radiator. I checked
it for full by feeling heat at the top.
I'll give the oil pressure another look tomorrow, and get exact numbers at
different rpms.
No noticable clank, bang, etc. The rpm just dropped off 200.
Need some more particularizes about your installation.
So its really hard to decide what might be the problem without
more data. I presume as best you could tell nothing happened (clank,
bang, backfire) when this unexpected reduction in rpm occurred?
One thing you might want to check is your ignition timing
static timing alignment. IF the clamp bolt on the distributor or I
believe the Renesis use a pulley ignition timing sensor becomes loose during
the run and the timing shifted that could cause such a sudden change.
Just another thing to check.
The first thing is to determine whether you really have a
problem or did something change, fuel flow, air flow, muffler? Another
possibility is if the heat stress caused your muffler to partially collapse,
that could cut your power.
Rv-6A N494BW Rotary Powered
0D
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