The Murphy Builders Site

There is a fellow here with the 9 cylinder version (not on a Rebel)
which I think is 150 hp but that's a lot of spark plugs and a lot of
cylinders to maintain!
Ken

apoulsen wrote:

Just picked this up from the EAA e-hotline. They certainly have my attention.

MURPHY REBEL TO LAUNCH RADIAL OPTION AT OSHKOSH
Murphy Aircraft will unveil a radial-equipped Rebel at EAA AirVenture Oshkosh 2006. The Radial Rebel features a seven-cylinder 110-hp Rotec 2800 that gives builders the option of that classic radial look, without a performance enhancement over the opposed-cylinder engines. The Radial Rebel, like its predecessors the O-235 and Rotax-powered Rebels, is eligible to be built under as a light sport aircraft, to be flown by those holding a type-endorsed sport pilot certificate. For more information visit www.murphyair.com.

Allen Poulsen
786R

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Ken-

I'd love to see that 9 cylinder radial hanging off the front of my Elite!




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And at 102 kg (224 lbs) with starter, carb, and alternator, that's a lot
of weight.

Ken wrote:

There is a fellow here with the 9 cylinder version (not on a Rebel)
which I think is 150 hp but that's a lot of spark plugs and a lot of
cylinders to maintain!
Ken

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...referring to the 7 cyl. 110 HP model, per
http://www.rotecradialengines.com/specs.htm

Ron Shannon wrote:

And at 102 kg (224 lbs) with starter, carb, and alternator, that's a lot
of weight.

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wow he must have got one of the very first ones. I thought they just
started shipping them in the spring. If I had any idea how much work I have
had to do to change my engine I might have gone for one too.

At 11:00 PM 6/16/2006 -0400, you wrote:

There is a fellow here with the 9 cylinder version (not on a Rebel)
which I think is 150 hp but that's a lot of spark plugs and a lot of
cylinders to maintain!
Ken

apoulsen wrote:

Just picked this up from the EAA e-hotline. They certainly have my

attention.

MURPHY REBEL TO LAUNCH RADIAL OPTION AT OSHKOSH
Murphy Aircraft will unveil a radial-equipped Rebel at EAA AirVenture

Oshkosh 2006. The Radial Rebel features a seven-cylinder 110-hp Rotec 2800
that gives builders the option of that classic radial look, without a
performance enhancement over the opposed-cylinder engines. The Radial
Rebel, like its predecessors the O-235 and Rotax-powered Rebels, is
eligible to be built under as a light sport aircraft, to be flown by those
holding a type-endorsed sport pilot certificate. For more information visit
www.murphyair.com.

Allen Poulsen
786R

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Drew



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No I still think you made the right choice Drew for a great many
reasons.The Rotec is not technically advanced. For example I'll take
forged parts over billet machined parts every time. It has the risk of
only one part source and I'd predict higher maintanance. And it has no
fuel consumption or weight advantage from what I can see. It should be a
smooth engine but you'd have to want the radial look. The diesels are
far more intriguing to me if one wants to get adventurous.
Ken

Drew Dalgleish wrote:

wow he must have got one of the very first ones. I thought they just
started shipping them in the spring. If I had any idea how much work I have
had to do to change my engine I might have gone for one too.

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I'm nor really regretting my choice but I do like the radial look. I hadn't
considered the single source for parts aspect thats a good point. I also
like the thought of a diesel engine. I phoned mikael zoche about 10 years
ago and offered my airframe as a test bed to show off his engine around
north america. He wasn't even a little interested and it looks like he's
accomplished nothing since then.

At 09:30 AM 6/17/2006 -0400, you wrote:

No I still think you made the right choice Drew for a great many
reasons.The Rotec is not technically advanced. For example I'll take
forged parts over billet machined parts every time. It has the risk of
only one part source and I'd predict higher maintanance. And it has no
fuel consumption or weight advantage from what I can see. It should be a
smooth engine but you'd have to want the radial look. The diesels are
far more intriguing to me if one wants to get adventurous.
Ken

Drew Dalgleish wrote:

wow he must have got one of the very first ones. I thought they just
started shipping them in the spring. If I had any idea how much work I have
had to do to change my engine I might have gone for one too.

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Drew



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Considering an 0320 150-160 HP is 260 lbs... plus or minus, I would find 224 lbs for the 9 cyl. rotec hard to believe. Thanks for clearing that up Ron.

Bruce

-----Original Message-----

From: Ron Shannon <rshannon@cruzcom.com>
Sent: Jun 17, 2006 12:12 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Radial Rebel

...referring to the 7 cyl. 110 HP model, per
http://www.rotecradialengines.com/specs.htm

Ron Shannon wrote:

And at 102 kg (224 lbs) with starter, carb, and alternator, that's a lot
of weight.

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________________________________________
PeoplePC Online
A better way to Internet
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I wouldn't straight off doubt the weight spec. Rotec has been around, is
successful with the 7 cyl, and successful in getting the 9 cyl to market. I
doubt if that kind of thing is possible with faking something as simple as
weight. As well, although lots of cylinders -- mostly aluminum -- the crank,
case, and cams are short. (i don't know how cams are done in radials)

The real story on the Rotec IMO is the low end torque. Notice the BIG prop
they are turning -- something like 95" IIRC, and at ~2000rpm, 150 horses.
Big prop disk, great rpm, low weight, and that bugger is going to launch a
Rebel like nobody's business. I recently emailed Rotec with a couple
questions and they had said a 2-blade 80" would be possible, although I don't
know how well it would be pitch wise for a Rebel. I imagined 80" was closer
to the max diameter possible for the Rebel, and/or that particular engine
might require a 3 blade.

BTW, I'm still hoping Gesoco is still working on the 125hp R-263. No update
on their web site in almost a year.
-Ben



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I concluded that the installed weight of an 0-320 was going to be more
like 300 lbs. and I think that did not include the prop.

The numbers quoted by Rotec don't seem to include the exhaust collector
ring, oil tank and plumbing, recommended aux electric scavenge pump,
etc. The prop gearing helps them get the weight per hp. down. That's the
major reason that a Rotax 912 is so light. However weight per hp tends
to go up with the number of cylinders. Billet machining guarantees that
some parts will be a bit heavier.

Another gentleman had me scratching my head for a bit. While looking at
the 9 cylinder engine which has a normal firing order of
1-3-5-7-9-2-4-6-8, he said "too bad that 5 cylinders fire on the first
crankshaft rotation but only 4 fire on the second crankshaft rotation" ;)

Ken

Bruce Georgen wrote:

Considering an 0320 150-160 HP is 260 lbs... plus or minus, I would find 224 lbs for the 9 cyl. rotec hard to believe. Thanks for clearing that up Ron.

Bruce

-----Original Message-----

From: Ron Shannon <rshannon@cruzcom.com>
Sent: Jun 17, 2006 12:12 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Radial Rebel

...referring to the 7 cyl. 110 HP model, per
http://www.rotecradialengines.com/specs.htm

Ron Shannon wrote:

And at 102 kg (224 lbs) with starter, carb, and alternator, that's a lot
of weight.

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The nose looks too long. Is that because the 115hp(?) is light? I wonder if
the 150hp version will be mounted closer to the firewall.

From: John Kramer <369R@kramers.org>
Reply-To: <rebel-builders@dcsol.com>
To: <rebel-builders@dcsol.com>
Subject: [rebel-builders] Radial Rebel
Date: Fri, 23 Jun 2006 21:16:02 -0500

It seems the word is getting out.

http://www.aero-news.net/index.cfm?Cont ... 2b83a8dcd1





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NO ! ! ! ! ! ! !! ! ! ! !


----- Original Message ----
From: Dale Fultz <dfultz17086@earthlink.net>
To: rebel-builders@dcsol.com
Sent: Monday, July 31, 2006 11:06:10 AM
Subject: [rebel-builders] Radial Rebel


Did the radial Rebel ever make it to Oshkosh??? Dale SR-033



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I left Friday am and it wasn't there that i could see.

Steve W

From: "Dale Fultz" <dfultz17086@earthlink.net>
Reply-To: <rebel-builders@dcsol.com>
To: <rebel-builders@dcsol.com>
Subject: [rebel-builders] Radial Rebel
Date: Mon, 31 Jul 2006 12:06:10 -0400

Did the radial Rebel ever make it to Oshkosh??? Dale SR-033



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I talked to DM at Osh and he said it wouldn't be
making it. I think he stated cooling issues.
Keith

--- Dale Fultz <dfultz17086@earthlink.net> wrote:

Did the radial Rebel ever make it to Oshkosh???
Dale SR-033

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As a matter of fact, it hadn't accumulated its 25 hrs, and had developed
an oil leak.

Al






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