Return-Path: Received: from smtp110.mail.sc5.yahoo.com ([66.163.170.8] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with SMTP id 555925 for flyrotary@lancaironline.net; Sat, 04 Dec 2004 13:05:41 -0500 Received-SPF: none receiver=logan.com; client-ip=66.163.170.8; envelope-from=prvt_pilot@yahoo.com Received: from unknown (HELO stevehome) (prvt?pilot@24.136.229.34 with login) by smtp110.mail.sc5.yahoo.com with SMTP; 4 Dec 2004 18:05:10 -0000 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: power sag Date: Sat, 4 Dec 2004 13:04:57 -0500 Message-ID: <001401c4da2b$c4602260$6b01a8c0@workgroup.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01C4DA01.DB8A1A60" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.6604 (9.0.2911.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C4DA01.DB8A1A60 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit That's possible. I'm not sure how much it sagged, but it seemed significant. May have only been a couple hundred RPM's though. At least while still on the ground, it didn't have the same pucker effect that it would have a little later. I was really impressed with the engine performance, just before it sagged. It really put me back in the seat on the takeoff roll. If I had pushed it to full throttle, I'd probably been really impressed. Of course, I'd been airborne earlier, so it's a good thing that I didn't Steve -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Perry Mick Sent: Saturday, December 04, 2004 11:22 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: power sag I get the spark plug sag after about 50-100 hours on a set of leading plugs. It usually happens the first time after takeoff and I'm a few hundred feet in the air, but it's never that "drastic", just 100-200 RPM drop. It does get your attention! Kelly Troyer wrote: 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 abo ut 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_000_0015_01C4DA01.DB8A1A60 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
That's=20 possible.  I'm not sure how much it sagged, but it seemed=20 significant.  May have only been a couple hundred RPM's = though.  At=20 least while still on the ground, it didn't have the same pucker effect = that it=20 would have a little later.
 
I was=20 really impressed with the engine performance, just before it = sagged.  It=20 really put me back in the seat on the takeoff roll.  If I had = pushed it to=20 full throttle, I'd probably been really impressed.  Of course, I'd = been=20 airborne earlier, so it's a good thing that I didn't
 
 
Steve
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Perry=20 Mick
Sent: Saturday, December 04, 2004 11:22 = AM
To: Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: power=20 sag

I get the spark plug sag after about 50-100 = hours on a=20 set of leading plugs. It usually happens the first time after takeoff = and I'm=20 a few hundred feet in the air, but it's never that "drastic", just = 100-200 RPM=20 drop. It does get your attention!

Kelly Troyer wrote:
Steve,
   May be the famous "Spark Plug Sag" as reported by = Tracy=20 and Ed !!
--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2




--------------=20 Original message from "Steve Brooks" <prvt_pilot@yahoo.com>:=20 --------------


> I went to South Carolina Thursday = to=20 replace the fuel regulator, and do some
> flying. I = replaced the=20 regulator, and ran the engine some on Thursday, but
> no = flying=20 because it was getting dark.
>
> On Saturday, I went = to fly,=20 and had some trouble getting it to stay running
> due to = the cold=20 temperatures. I probably didn't keep it rich enough, long
> = enough.=20 I taxied out to the far end of the runway (5000'), and took the =
>=20 runway for take off.
>
> As I accelerated to about = 90 kts, I=20 was just rotating when to power dropped
> substantially. I = cut the=20 throttle, and aborted the takeoff.
>
> I don't know = exactly=20 what caused the sag. I pulled the throttle all the way
> = back=20 during the aborted takeoff, and the engine died. I have my idle = stop=20
> set a little low (400 RPM's), and usually don't pull it = all the=20 way off, but
> even when I do, it has never died.
> =
>=20 I restarted it, and ran the power up to about 4000, and it seemed = OK.=20
>
> Another issue with my right main wheel bearing = prevented=20 me from making any
> more high speed runs. The right wheel = has been=20 making noise, and I was
> trying to resolve it with the = mfg, but=20 during the aborted take off, it
> really made allot of = noise, and=20 also vibrated pretty good at one speed, so I
> decided that = I=20 better get that fixed before doing any more flying.
> =
> I=20 changed the fuel regulator, so I guess that it could have been = some air=20
> still in the fuel line, but the engine had probably run = for at=20 least 10
> minutes prior to the take off roll. It also = could have=20 been some water,
> though I've never found any to date = during=20 preflight. The engine was
> running at 5 lbs of boost and = abo ut=20 5000 RPM's. It was about 45 degrees,
> and the plane was=20 accelerating very strong prior to the power loss. I don't
> = know if=20 it would have picked back up, but I was glad that it didn't happen = 5=20
> seconds later.
>
> Steve Brooks
> =
>=20
> >> Homepage: http://www.flyrotary.com/ =
>=20 >> Archive: http://lancai= ronline.net/lists/flyrotary/List.html=20

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