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4 stroke in a kolb

 
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mshimei(at)bellsouth.net
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PostPosted: Thu May 22, 2008 4:07 am    Post subject: 4 stroke in a kolb Reply with quote
I have been working on a Generac conversion for my Ultrastar for several months now. I had to rebuild the cage and am working on a motor mount to use a direct drive version that hand props to start. There is one currently flying in a thunder gull in Illinois with 30+ hours now. The engine will weigh the same as the Cuyuna that was removed with 5 more Hp. I would have more progress,but I am taking care of a sick parent(who wants to see my lawnmower engine plane fly). Mark in Florida.
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Dana



Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
PostPosted: Thu May 22, 2008 5:34 pm    Post subject: 4 stroke in a kolb Reply with quote
At 08:06 AM 5/22/2008, Mark wrote:

Quote:
I have been working on a Generac conversion for my Ultrastar for several months now. I had to rebuild the cage and am working on a motor mount to use a direct drive version that hand props to start. There is one currently flying in a thunder gull in Illinois with 30+ hours now. The engine will weigh the same as the Cuyuna that was removed with 5 more Hp....

Same weight as the Cuyuna? I though the Generac conversion was around 120 lbs, isn't it? The Cuyuna is 69 without the redrive. If it's really that light it could be a great engine for that class of aircraft.

Any pictures?

-Dana

--
"A government that robs Peter to pay Paul can always depend upon the support of Paul."-- George Bernard Shaw [quote][b]

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ulflyer(at)verizon.net
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PostPosted: Thu May 22, 2008 5:40 pm    Post subject: 4 stroke in a kolb Reply with quote
Hi Mark,
Interesting project. Question - did your Cuyuna have any type of reduction drive - belt, gear box, etc.
Problem is to get the HP your have to turn RPM - turning a prop that fast normally reduces its efficiency. Like to hear more, good or bad as you progress. I hope this works for you. I used to have a FireFly, now I presently have a Hawk flying and Gull under slooow construction. Looking for more fuel efficient engine.
jerb

At 07:06 AM 5/22/2008, you wrote:
[quote]I have been working on a Generac conversion for my Ultrastar for several months now. I had to rebuild the cage and am working on a motor mount to use a direct drive version that hand props to start. There is one currently flying in a thunder gull in Illinois with 30+ hours now. The engine will weigh the same as the Cuyuna that was removed with 5 more Hp. I would have more progress,but I am taking care of a sick parent(who wants to see my lawnmower engine plane fly). Mark in Florida.

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customersupport(at)tnkolb
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PostPosted: Fri May 23, 2008 4:52 am    Post subject: 4 stroke in a kolb Reply with quote
MARK PLEASE KEEP US POSTED ,SOUNDS INTERESTING, TRAVIS.
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jb92563



Joined: 23 Mar 2007
Posts: 314
Location: Southern California
PostPosted: Fri May 23, 2008 7:14 am    Post subject: Re: 4 stroke in a kolb Reply with quote
The Cuyuna UL-202 weighs 58 lbs and the Cuyuna 430 weighs 65 lbs without the prop/redrive

I would be very interested in this conversion if it was in the under 100 lbs category for my own UltraStar.

I think that puts it outside the Part 103 Ultralight category.

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Ray

Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
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mshimei(at)bellsouth.net
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PostPosted: Mon May 26, 2008 6:59 pm    Post subject: 4 stroke in a kolb Reply with quote
MARK PLEASE KEEP US POSTED ,SOUNDS INTERESTING,  TRAVIS.
 
  I have been working on a Generac conversion for my Ultrastar for
several months now. I had to rebuild the cage and am working on a motor
mount to use a direct drive version that hand props to start. There is
one currently flying in a thunder gull in Illinois with 30+ hours now.
The engine will weigh the same as the Cuyuna that was removed with 5
more Hp. I would have more progress, but I am taking care of a sick
parent (who wants to see my lawnmower engine plane fly). Mark in Florida.

The Cuyuna has a 2;1 belt reduction,exhaust,intake ,pullstart,and carb.No prop. Total weight is 81lbs.

 Valley engineering has a prototype that is down to 78lbs with prop, and 200# thrust. But their ignition is run on a battery. I am trying to use the existing mag setup AND make a hub with a thrust bearing as to not wear out the case. We are also thinking of putting it on my friends Firefly that has 630hrs on the 447(1 decarb) and is looking for something else to try besides the ˝ VW.

Did a lot of work on the airframe today,lot of TIG welding….Mark
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