There is quite a bit of alternate engine discussion on the so-cal RV List.  Mostly the "no you can't"s vs. the "Yes I can"s  (me included).  Dan is the local 200hp IO-360 RV-7 champ, while Robert flys a Supercharged 4-cyl Subie powered RV-7. 

 

Because of my current surge problem, and ongoing cooling limitations I can't keep up these guys.  Besides my RV-6 would have a slight disadvantage, we need another RV-7 or an RV-4...  Hint hint Tracy  :-)

 

Dave

---------- Forwarded message ----------
From: Dan Checkoway <dan@rvproject.com>
Date: Jul 25, 2005 8:11 AM
Subject: Re: [SoCAL-RVlist] Re: Sube vs. Lycoming
To: SoCAL-RVlist@yahoogroups.com

Guys, as a moderator on this list, I'm obligated to ask you to keep the back
and forth to a minimum.

For what it's worth...

At some point after Robert gets back from OSH, we plan to do some serious
data collection.  The intention is to fly at several different airspeeds at
each altitude from sea level up to maybe 15,000' and produce a table chock
full of performance comparison data (specifically fuel flow data for each
data point).  Hopefully this will provide an honest to goodness
"spreadsheet" that highlights roughly what to expect out of an RV-7 if you
go with (a) or (b).  Neither Robert nor I are professional test pilots, so
you will have to take everything with a grain of salt, but I think this
upcoming quantification will be enlightening.

The other day when we flew side by side, I didn't even look at my fuel flow,
and I can't speak for Robert there either.  We were just having fun.  And,
to be honest, I have never done a really thorough "analysis" of my own
plane's performance -- to the level of detail that I hope to acquire in this
upcoming test.  The new tables that we'll come up with will hopefully answer
all of your questions.

)_( Dan
RV-7 N714D
http://www.rvproject.com

----- Original Message -----
From: "yukon11111111" <jragz@hotmail.com>
To: < SoCAL-RVlist@yahoogroups.com>
Sent: Monday, July 25, 2005 6:43 AM
Subject: [SoCAL-RVlist] Re: Sube vs. Lycoming


> Robert,
>
> Both of my posts ask the simple, unambiguous question, "what is your
> rated horsepower?". Just like the Egg site, you seem to be unwilling
> to provide even the most straight-forward of quantitative
> measurements.
>
> As my RV-9 project continues to progress, I remain interested in
> alternative engines, especially those whose benefits can be measured
> numerically, not just emotionally.
>
> Once again, Dan's airplane is cruising at about 150 hp.  What were
> you producing in this flyoff, and what was your fuel flow?
>
> John
> RV-9 QB
>
>
>
>
>
>
>
>
>
>
>
>
> --- In SoCAL-RVlist@yahoogroups.com , "Robert Paisley" <robert@p...>
> wrote:
>> I see no question in your previous post, just an uninformed
>> presumption and poke. I belive I answered your question anyhow. If
>> you are interested in these motors I am happy to communicate with
>> you. If you are not interested (which seems more the case), I'm
> sure
>> we both we have better things to do than argue about it.
>> Robert
>> P.S. The six cylinder motor is very close in weight to my current
>> setup.
>>
>>
>> --- In SoCAL-RVlist@yahoogroups.com , "yukon11111111" <jragz@h...>
>> wrote:
>> > Robert,
>> > Again, I ask the simple question, what is your rated power at
>> > 8500'????
>> >
>> > John
>> >
>> >
>> >
>> >
>> >
>> > --- In SoCAL-RVlist@yahoogroups.com, "Robert Paisley"
>> <robert@p...>
>> > wrote:
>> > > John,
>> > > Horsepower is horsepower, it doesn't matter what brand pistons
>> are
>> > > making it. My plane is only making a little more power than
>> Dan's,
>> > > hence the small speed advantage.
>> > > Stop by at Osh:)
>> > > Robert
>> > >
>> > >
>> > >
>> > > --- In SoCAL-RVlist@yahoogroups.com, "yukon11111111"
>> <jragz@h...>
>> > > wrote:
>> > > > Saw posting on Egg site that said Robert Paisley's airplane
>> was
>> > a
>> > > > couple of knots faster than Dan's plane.
>> > > >
>> > > > I believe a normally aspirated 0-360 is producing about 150
> hp
>> > at
>> > > > 8500'.  Isn't the supercharged Sube producing rated power
>> (200+)
>> > > under
>> > > > those conditions? Is this really a benchmark?
>> > > >
>> > > > John
>> > > > RV-9
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>




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--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html