Mailing List flyrotary@lancaironline.net Message #8784
From: John Slade <sladerj@bellsouth.net>
Subject: RE: [FlyRotary] Re: Power loss diagnostics
Date: Tue, 1 Jun 2004 22:29:53 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message
Boy, John after reading your offer of free fuel, room and beer - I started packing - then  
> I remembered my gearbox is at Tracy's for the retrofit of the 2.85 {:<( and I am not inclined to drive, sorry. 
No problem, Ed. I'll come and get you in the Cozy. We can diagnose it on the way back :)
Tell you what - if this goes on too much longer I'd spring for a commercial flight.
 
Now if you have a lot of prop that of course could be part of the answer why your rpm is lower  
Yep. I have a LOT of prop.
 
 > so unless its some problems with fouled plugs 
The plugs were as foul as I've seen, and I've seen FOUL.
 
>I use SCATT tube and have never had it collapse, you do have the type with the wire in it?   
Yes. I think it may be a bit restrictive, but it probably didn't collapse
 
had coasted down and landed (giving the engine some time to cool off in descent) I believe  
> you found you had regained your power. 
The response was immediate when I adjusted the mixture during the return taxi. I think toward rich.
 
could not find any place where you indicated you had checked your fuel pressure (I might have just missed it).   
So might I. I don't recall it. It's in my scan, but....
 
Could the heat generated by the climbout have caused something like that  [vapor lock]
I'm thinking heat too. The power loss happened about 35 mins into the flight during mid power cruise. I doubt it was vapor lock, though I've never experienced it I would expect more fluctuation in rpm. This was as if someone switched off half the engine. (or maybe 1/3)
 
>  Could have been mixture.  I sort of discount this one as if you are flying and everything is stable engine wise, the fuel  
requirements (and therefore mixture ) does not usually change abruptly enough to cause that kind of power loss. 
but if the ignition isn't there, the mixture is automatically off - right. It WAS a mixture adjustment that brought the power back.
 
> If you want to discuss this further off line, just drop me a line or give me a call 704-821-7595. 
Thanks. I'm happy to discuss it in public. Maybe it'll help someone else - like maybe Buly 6 years from now, when he's going through the same stuff. :)
 
Thanks for the input, Ed.
John
 
 
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