Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 100209 for flyrotary@lancaironline.net; Tue, 01 Jun 2004 22:30:29 -0400 Received: from TOSHIBAjhr ([209.214.14.92]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with SMTP id <20040602022955.LNXG24541.imf23aec.mail.bellsouth.net@TOSHIBAjhr> for ; Tue, 1 Jun 2004 22:29:55 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Power loss diagnostics Date: Tue, 1 Jun 2004 22:29:53 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C44827.F5C920E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-reply-to: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C44827.F5C920E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit 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 ------=_NextPart_000_001A_01C44827.F5C920E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
> Boy, John after reading your = offer of free=20 fuel, room and beer - I started packing - then  
> I remembered my gearbox is at = Tracy's for=20 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=20 the way back :)
Tell you what - if this goes on too much longer I'd spring for = a=20 commercial flight.
 
> Now if you have a lot of prop = that of=20 course could be part of the answer why your rpm is lower  
Yep. I=20 have a LOT of prop.
 
 > so unless its some = problems with=20 fouled plugs 
The plugs were as foul as I've seen, and I've = seen=20 FOUL.
 
>I use SCATT tube and have never = had it=20 collapse, you do have the type with the wire in it?   
Yes. I think it may be a bit restrictive, but = it=20 probably didn't collapse
 
> had coasted down and landed = (giving the=20 engine some time to cool off in descent) I believe  
> you found you had regained your=20 power. 
The response was immediate when I adjusted = the mixture=20 during the return taxi. I think toward rich.
 
> could not find any place where = you=20 indicated you had checked your fuel pressure (I might have just missed=20 it).   
So=20 might I. I don't recall it. It's in my scan, but....
 
> Could the heat generated by the = climbout=20 have caused something like that  [vapor = lock]
I'm thinking heat too. The power loss = happened about 35=20 mins into the flight during mid power cruise. I doubt it was vapor lock, = though=20 I've never experienced it I would expect more fluctuation in rpm. This = was as if=20 someone switched off half the engine. (or maybe = 1/3)
 
>  Could have been mixture.  = I sort of=20 discount this one as if you are flying and everything is stable engine = wise, the=20 fuel  
> requirements (and therefore = mixture ) does=20 not usually change abruptly enough to cause that kind of power = loss. 
but if=20 the ignition isn't there, the mixture is automatically off - right. It = WAS a=20 mixture adjustment that brought the power back.
 
> If you want to discuss this = further off=20 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=20 help someone else - like maybe Buly 6 years from now, when he's going = through=20 the same stuff. :)
 
Thanks for the input, = Ed.
John
 
 
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