REFLECTOR: Fuel Consumption Performance more data
Scott Derrick
scott at tnstaafl.net
Tue Sep 8 17:28:53 CDT 2009
Sorry Brent I see you included that in your original message.
Scott
Brent Bourgeois wrote:
> 2 way average ground speed with GPS
>
> --- On *Tue, 9/8/09, Scott Derrick /<scott at tnstaafl.net>/* wrote:
>
>
> From: Scott Derrick <scott at tnstaafl.net>
> Subject: Re: REFLECTOR: Fuel Consumption Performance more data
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Date: Tuesday, September 8, 2009, 8:31 AM
>
> you didn't say if that 190mph was TAS, IAS, ground speed and how you
> measured it?
>
> Brent Bourgeois wrote:
> > These are the numbers from 9-3-09 for my Std RG IO-360 200Hp
> > Speed is a 2 way average from the gps.
> >
> > 9500 ALT
> > 2580/20.2
> > 40 deg LOP
> > 190 MPH
> > 9 GPH
> > 55 OAT
> >
> > Brent
> > N61VB
> > New Orleans La
> >
> >
> > --- On *Fri, 8/28/09, John Tvedte /<johnt at comp-sol.com
> <http://us.mc513.mail.yahoo.com/mc/compose?to=johnt@comp-sol.com>>/*
> wrote:
> >
> >
> > From: John Tvedte <johnt at comp-sol.com
> <http://us.mc513.mail.yahoo.com/mc/compose?to=johnt@comp-sol.com>>
> > Subject: Re: REFLECTOR: Fuel Consumption Performance
> > To: "Velocity Aircraft Owners and Builders list"
> <reflector at tvbf.org
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector@tvbf.org>>
> > Date: Friday, August 28, 2009, 11:29 PM
> >
> > Terry,
> >
> > I think Scott is saying... as you lean, the first cylinder
> to peak
> > is the leanest - the last to peak is the richest... if cruising
> > ROP, you lean by the leanest cylinder (first to peak), but if
> > cruising LOP, you lean by the richest cylinder (last to peak) -
> > because you are on the other side of the Red Box.
> >
> > www.eaa42.org/misc/gregs_show.ppt
> >
> > Note, I do not claim to have any practical experience.
> >
> > John
> >
> > ________________________________________
> > From: reflector-bounces at tvbf.org
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> >
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> > [reflector-bounces at tvbf.org
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> >
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>]
> > On Behalf Of Terry Miles [terrence_miles at hotmail.com
> <http://us.mc513.mail.yahoo.com/mc/compose?to=terrence_miles@hotmail.com>
> >
> <http://us.mc513.mail.yahoo.com/mc/compose?to=terrence_miles@hotmail.com>]
> > Sent: Friday, August 28, 2009 11:31 AM
> > To: 'Velocity Aircraft Owners and Builders list'
> > Subject: Re: REFLECTOR: Fuel Consumption Performance
> >
> > Well I appreciate your patience. I did read the below articles,
> > and several
> > books now on related engine operations and mixture settings
> and we
> > are in
> > full agreement on the concept. I am not running ROP. I am
> running 50
> > degrees LOP. The question between us is which cylinder
> should be the
> > reference cylinder. My choice in this is that I will use the
> > first cylinder
> > to peak.
> > Thanks again.
> > Terry
> >
> > -----Original Message-----
> > From: reflector-bounces at tvbf.org
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> >
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> > [mailto:reflector-bounces at tvbf.org
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>
> >
> <http://us.mc513.mail.yahoo.com/mc/compose?to=reflector-bounces@tvbf.org>]
> > On
> > Behalf Of Scott Derrick
> > Sent: Thursday, August 27, 2009 21:01
> > To: Velocity Aircraft Owners and Builders list
> > Subject: Re: REFLECTOR: Fuel Consumption Performance
> >
> > Terry,
> >
> > Below is my reply of a month ago when you indicated you were
> > leaning to 50
> > LOP on the first cylinder to peak. All the rest being richer.
> > Which as I
> > stated a month ago is BAD!
> >
> > Maybe I misunderstood and you are now running ROP? Leaning
> until
> > the first
> > cylinder reaches peak, and then enriching it until it is 50 ROP?
> > That would be the old school acceptable method. If you
> decide to
> > read the
> > articles below, you will read that GAMI recommends 75 ROP
> because
> > 50 ROP
> > may be stressful to some engines at high power settings and low
> > altitude.
> >
> > But, since you were running at 10K or above you can run at
> any mixture
> > setting and be fine, as far as detonation is concerned
> because the
> > engine
> > cannot produce more than 75% power at full throttle.
> >
> > I once again recommend the articles below by John Deacon
> about how to
> > safely operate these big bore aircraft engines. They are
> > expensive and
> > easy harm.
> >
> > Scott
> >
> >
> > **********************************************************
> >
> > Terry,
> >
> > running the first cylinder LOP can put some of the richer
> > cylinders right in
> > the BAD zone. Thats well... bad! Thats why you always lean
> to the
> > last
> > cylinder when running LOP. Thats also why you lean to the first
> > cylinder
> > when running ROP, so all the other cylinders are rich of
> that point.
> >
> > you said
> >
> > "I was afraid my coolest cyl could be 150 LOP before the
> last cly
> > peaked and
> > that I could burn that exhaust valve."
> >
> >
> > Thats exactly backwards. Once a cylinder reaches peak EGT
> and goes
> > on the
> > LOP side it will run cooler and cooler the leaner you run
> it. The
> > absoluter
> > worst mixture is about 25-50 degrees ROP in terms of detonation
> > and the
> > timing of peak power pulses. If your coolest cylinder was
> running
> > at 150
> > degrees leaner than the last cylinder to reach 75 LOP it would
> > probably not
> > be firing due to the too lean mixture.
> >
> > How to operate your engine is a complex topic. Here is a
> great set of
> > articles by John Deacon, I consider a must for any recip
> operator,
> > whether
> > you run LOP or ROP.
> >
> > part 1
> > http://www.avweb.com/news/pelican/182179-1.html
> > part 2
> > http://www.avweb.com/news/pelican/182176-1.html
> > part 3
> > http://www.avweb.com/news/pelican/182583-1.html
> > part 4
> > http://www.avweb.com/news/pelican/183094-1.html
> >
> >
> > Here's GAMI's lean test, a great thing for anybody to do,
> to see how
> > balanced their injectors are.
> >
> > http://www.gami.com/gamijectors/leantest.php
> >
> >
> > Scott
> >
> >
> >
> > >
> >
> >
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> >
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