Return-Path: Received: from mtiwmhc13.worldnet.att.net ([204.127.131.117] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 555834 for flyrotary@lancaironline.net; Sat, 04 Dec 2004 10:54:48 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.131.117; envelope-from=keltro@att.net Received: from 204.127.135.42 ([204.127.135.42]) by worldnet.att.net (mtiwmhc13) with SMTP id <2004120415541111300d78i6e>; Sat, 4 Dec 2004 15:54:16 +0000 Received: from [209.247.222.94] by 204.127.135.42; Sat, 04 Dec 2004 15:54:10 +0000 From: keltro@att.net (Kelly Troyer) To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] power sag Date: Sat, 04 Dec 2004 15:54:10 +0000 Message-Id: <120420041554.9471.41B1DDA200027E95000024FF2160281302019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 18 2004) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_9471_1102175650_0" --NextPart_Webmail_9m3u9jl4l_9471_1102175650_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Steve, May be the famous "Spark Plug Sag" as reported by Tracy and Ed !! -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from "Steve Brooks" : -------------- > I went to South Carolina Thursday to replace the fuel regulator, and do some > flying. I replaced the regulator, and ran the engine some on Thursday, but > no flying because it was getting dark. > > On Saturday, I went to fly, and had some trouble getting it to stay running > due to the cold temperatures. I probably didn't keep it rich enough, long > enough. I taxied out to the far end of the runway (5000'), and took the > runway for take off. > > As I accelerated to about 90 kts, I was just rotating when to power dropped > substantially. I cut the throttle, and aborted the takeoff. > > I don't know exactly what caused the sag. I pulled the throttle all the way > back during the aborted takeoff, and the engine died. I have my idle stop > set a little low (400 RPM's), and usually don't pull it all the way off, but > even when I do, it has never died. > > I restarted it, and ran the power up to about 4000, and it seemed OK. > > Another issue with my right main wheel bearing prevented me from making any > more high speed runs. The right wheel has been making noise, and I was > trying to resolve it with the mfg, but during the aborted take off, it > really made allot of noise, and also vibrated pretty good at one speed, so I > decided that I better get that fixed before doing any more flying. > > I changed the fuel regulator, so I guess that it could have been some air > still in the fuel line, but the engine had probably run for at least 10 > minutes prior to the take off roll. It also could have been some water, > though I've never found any to date during preflight. The engine was > running at 5 lbs of boost and about 5000 RPM's. It was about 45 degrees, > and the plane was accelerating very strong prior to the power loss. I don't > know if it would have picked back up, but I was glad that it didn't happen 5 > seconds later. > > Steve Brooks > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_9471_1102175650_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Steve,

May be the famous "Spark Plug Sag" as reported by Tracy and Ed !!

--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2

-------------- Original message from "Steve Brooks" <prvt_pilot@yahoo.com>: --------------

> I went to South Carolina Thursday to replace the fuel regulator, and do some
> flying. I replaced the regulator, and ran the engine some on Thursday, but
> no flying because it was getting dark.
>
> On Saturday, I went to fly, and had some trouble getting it to stay running
> due to the cold temperatures. I probably didn't keep it rich enough, long
> enough. I taxied out to the far end of the runway (5000'), and took the
> runway for take off.
>
> As I accelerated to about 90 kts, I was just rotating when to power dropped
> substantially. I cut the throttle, and aborted the takeoff.
>
> I don't know exactly what caused the sag. I pulled the throttle all the way
> back during the aborted takeoff, and the engine died. I have my idle stop
> set a little low (400 RPM's), and usually don't pull it all the way off, but
> even when I do, it has never died.
>
> I restarted it, and ran the power up to about 4000, and it seemed OK.
>
> Another issue with my right main wheel bearing prevented me from making any
> more high speed runs. The right wheel has been making noise, and I was
> trying to resolve it with the mfg, but during the aborted take off, it
> really made allot of noise, and also vibrated pretty good at one speed, so I
> decided that I better get that fixed before doing any more flying.
>
> I changed the fuel regulator, so I guess that it could have been some air
> still in the fuel line, but the engine had probably run for at least 10
> minutes prior to the take off roll. It also could have been some water,
> though I've never found any to date during preflight. The engine was
> running at 5 lbs of boost and about 5000 RPM's. It was about 45 degrees,
> and the plane was accelerating very strong prior to the power loss. I don't
> know if it would have picked back up, but I was glad that it didn't happen 5
> seconds later.
>
> Steve Brooks
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html

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