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free air

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capedavis(at)yahoo.com
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Posted: Sun May 05, 2013 9:49 am Post subject: free air

Hi Kolbers , Just a question , has anyone ever tried a free air 377 on a Kolb ? or a 477  or 503 free air ? I have a chance to buy on I am also wondering if the fan cooling shrouds and fan off a Ski Doo will fit an aircraft 377 or are they the same engine ? Thanks Chrfis



 

Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly



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wakataka

Joined: 11 Aug 2012
Posts: 48

Posted: Sun May 05, 2013 3:44 pm Post subject: Re: free air

Chris - 

I have a fan cooled 377 from a 1992 Ski-Do and it has shrouds very similar to my UL-377 except they are made of steel rather than aluminum. Also, there is hole about 1.5" in diameter where a  tube was connected to the shroud to deliver fresh cooling into the muffler on the sled. It would be relatively easy to rivet some sheet metal over this hole and then you could use the shroud on the UL engine.  The fan and all the mounting holes in the castings are the same. The Ski-Do engine has the same internals, cylinders, and block as my UL engine but the PTO end of the block is not machined to accept a gearbox. It has the provision 8 bolt holes, which aren't tapped. I've read that this case can be machined to fit a gearbox, but of course it is verboten by Rotax.

 

I'd be a little skeptical about running free air but you might get away with it. I see CHT of 350 degrees on climb out with fan cooled 377. I think you'd be pushing red line with free air. The other drawback to free air is that it cools down more during descent, so you have more risk of cold seizure. With fan cooling, the engine stays warmer on a rapid descent at idle, such as when doing touch and go practice. If you are careful about the way you fly it, you might be able to get away with it. The 377 has a reputation of running cooler than the other engines.



Martin B.

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_________________
There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.

Mark Twain

aoldman(at)xtra.co.nz
Guest

Posted: Mon May 06, 2013 12:18 am Post subject: free air

I flew behind a free air 503 for about 200 hours . The engine always  performed well. It did at one time suffer a reduction in power. That problem  proved to be a broken head stud. At that point I removed the engine and replaced  all the engine bearings and re ringed the engine as it did not have any  maintenance history . I sold the microlight about 150 hours after the overhaul.  The new owner run it to 800 hrs. then replaced it with a 582 . So in the right  application free air works fine. It did have a ram air system  to the rear  cylinder .

  

 Regards

              Tony

                Downunder

               MK111 503

    

  From: chris davis (capedavis(at)yahoo.com) 

 Sent: Monday, May 06, 2013 5:48 AM

 To: kolb-list(at)matronics.com (kolb-list(at)matronics.com) 

 Subject: free air

  



   Hi Kolbers , Just a question , has anyone ever tried a  free air 377 on a Kolb ? or a 477  or 503 free air ? I have a chance to buy  on I am also wondering if the fan cooling shrouds and fan off a Ski  Doo will fit an aircraft 377 or are they the same engine ? Thanks  Chrfis

 

  

 Chris  Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building  Firefly



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wakataka

Joined: 11 Aug 2012
Posts: 48

Posted: Mon May 06, 2013 7:15 am Post subject: Re: free air

Tony - Just curious, was that in a tractor or pusher configuration? In other words, did the engine have the benefit of the prop blast for cooling? 



Martin B.

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aoldman(at)xtra.co.nz
Guest

Posted: Tue May 07, 2013 2:16 am Post subject: free air

It was a tractor



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