X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mtiwmhc11.worldnet.att.net ([204.127.131.115] verified) by logan.com (CommuniGate Pro SMTP 5.0c6) with ESMTP id 782942 for flyrotary@lancaironline.net; Tue, 25 Oct 2005 10:29:16 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.131.115; envelope-from=keltro@att.net Received: from 204.127.135.40 ([204.127.135.40]) by worldnet.att.net (mtiwmhc11) with SMTP id <2005102514283211100n8r9re>; Tue, 25 Oct 2005 14:28:32 +0000 Received: from [172.138.180.125] by 204.127.135.40; Tue, 25 Oct 2005 14:28:31 +0000 From: keltro@att.net (Kelly Troyer) To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Its a start! Date: Tue, 25 Oct 2005 14:28:31 +0000 Message-Id: <102520051428.1777.435E410D0009797D000006F12160280748019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Feb 14 2005) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_1777_1130250511_0" --NextPart_Webmail_9m3u9jl4l_1777_1130250511_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Ed, Well said and good advice !! Are we going to see you at the "Roundup"?? -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from "Ed Anderson" : -------------- > Bill, I believe its because there is less load with the PSRU than with the > automobile configuration. We use the automatic flex plate which in the > automobile has all the damping/load of the automatic transmission fluid. The > manual transmission flywheel probably weights close to 35 lbs, so has lots > of inertia that slows down the engine acceleration a bit. Also, I suspect > that some of our home made manifolds may have a bit more air leakage than > the stock throttle body/manifold - it does not take much of an air leak at > all to really rev the engine. > > I am personally aware of two incidents where a 13B was fired up without a > prop load and the throttle got advanced. One ended up with the bearings > melting because the engine rev faster than the oil supply could supply > pressure. The second incident ended up with the PSRU disintegrating and > embedding bolts in the wall of the garage - it was estimated that the engine > hit approx 13,000 rpm. > > Whether you accept the rationale for the high RPMs with no load or not, > Please do not disregard these cautions - it will rev faster than you can > react. > > My 1600 idle rpm throttle setting with the prop will give me 4500 rpm > without the prop - that's the idle setting. So you can imagine just opening > the throttle a little bit past idle would do without load > > Ed A > > > ----- Original Message ----- > From: > To: "Rotary motors in aircraft" > Sent: Tuesday, October 25, 2005 8:44 AM > Subject: [FlyRotary] Re: Its a start! > > > > Snip! > > Running without a prop is a bit risky - overrev can happen suddenly. > > Snip! > > > > I don't understand how this is true...The engine has everything attached > > that it has when it is installed in a car. It should run fine with just > > the > > flywheel...adding the PSRU would be similar to turning the clutch and > > front > > half of the tranny...???? > > > > Please explain. > > > > Bill Bradburry > > > > > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ --NextPart_Webmail_9m3u9jl4l_1777_1130250511_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Ed,

Well said and good advice !! Are we going to see you at the "Roundup"??

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

-------------- Original message from "Ed Anderson" <eanderson@carolina.rr.com>: --------------

> Bill, I believe its because there is less load with the PSRU than with the
> automobile configuration. We use the automatic flex plate which in the
> automobile has all the damping/load of the automatic transmission fluid. The
> manual transmission flywheel probably weights close to 35 lbs, so has lots
> of inertia that slows down the engine acceleration a bit. Also, I suspect
> that some of our home made manifolds may have a bit more air leakage than
> the stock throttle body/manifold - it does not take much of an air leak at
> all to really rev the engine.
>
> I am personally aware of two incidents where a 13B was fired up without a
> prop load and the throttle got advanced. One ended up with the bearings
> melting because the engine rev faster than the oil supply could supply
> pressure. The second incident ended up with the PSRU disintegrating and
> embedding bolts in the wall of the garage - it was estimated that the engine
> hit approx 13,000 rpm.
>
> Whether you accept the rationale for the high RPMs with no load or not,
> Please do not disregard these cautions - it will rev faster than you can
> react.
>
> My 1600 idle rpm throttle setting with the prop will give me 4500 rpm
> without the prop - that's the idle setting. So you can imagine just opening
> the throttle a little bit past idle would do without load
>
> Ed A
>
>
> ----- Original Message -----
> From:
> To: "Rotary motors in aircraft"
> Sent: Tuesday, October 25, 2005 8:44 AM
> Subject: [FlyRotary] Re: Its a start!
>
>
> > Snip!
> > Running without a prop is a bit risky - overrev can happen suddenly.
> > Snip!
> >
> > I don't understand how this is true...The engine has everything attached
> > that it has when it is installed in a car. It should run fine with just
> > the
> > flywheel...adding the PSRU would be similar to turning the clutch and
> > front
> > half of the tranny...????
> >
> > Please explain.
> >
> > Bill Bradburry
> >
> >
> > --
> > Homepage: http://www.flyrotary.com/
> > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
>
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/

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