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capedavis(at)yahoo.com
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 Posted: Mon May 27, 2013 6:46 am Post subject: free air rotax |
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kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
[quote][b]
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williamtsullivan(at)att.n
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| Posted: Mon May 27, 2013 7:04 am Post subject: free air rotax |
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Chris- Did you check Jack Hart's web site?
do not archive
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: | kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
| Quote: | http://www.matronics.com/Navigator?Kolb-ofollow" target="_blank" href="http://www.matronics.com/contribution">h
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[quote][b]
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capedavis(at)yahoo.com
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| Posted: Mon May 27, 2013 8:42 am Post subject: free air rotax |
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William , No but I will . thanx
Chris DavisKXP 503 492 hrsGlider PilotDisabled from crash building Firefly
[quote]
From: william sullivan <williamtsullivan(at)att.net>
To: kolb-list(at)matronics.com
Sent: Monday, May 27, 2013 11:04 AM
Subject: Re: free air rotax
Chris- Did you check Jack Hart's web site?
do not archive
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: | kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris DavisKXP 503 492 hrsGlider PilotDisabled from crash building Firefly
| Quote: | http://www.matronics.com/Navigator?Kolb-ofollow" target="_blank" href="http://www.matronics.com/contribution">h
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| Quote: |
=nofollow target=_blank>http://www.matronics.com/Navigator?Kolb-List
et=_blank>http://forums.matronics.com/
llow target=_blank>http://www.matronics.com/contribution
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[b]
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williamtsullivan(at)att.n
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| Posted: Mon May 27, 2013 8:44 am Post subject: free air rotax |
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Found it. Bookmark it. http://jackbhart.com/firefly/firefly.html
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: |
From: chris davis <capedavis(at)yahoo.com>
Subject: Re: Kolb-List: free air rotax
To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com>
Date: Monday, May 27, 2013, 12:42 PM
William , No but I will . thanx
Chris Davis KXP 503 492 hrs Glider Pilot Disabled from crash building Firefly
| Quote: |
From: william sullivan <williamtsullivan(at)att.net>
To: kolb-list(at)matronics.com
Sent: Monday, May 27, 2013 11:04 AM
Subject: Re: free air rotax
Chris- Did you check Jack Hart's web site?
do not archive
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: | kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis KXP 503 492 hrs Glider Pilot Disabled from crash building Firefly
| Quote: | http://www.matronics.com/Navigator?Kolb-ofollow" target="_blank" href="http://www.matronics.com/contribution">h
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| Quote: |
=nofollow target=_blank>http://www.matronics.com/Navigator?Kolb-List
et=_blank>http://forums.matronics.com/
llow target=_blank>http://www.matronics.com/contribution
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http://www.matronics.com/con================
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[quote][b]
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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williamtsullivan(at)att.n
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| Posted: Mon May 27, 2013 8:44 am Post subject: free air rotax |
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Found it. Bookmark it. http://jackbhart.com/firefly/firefly.html
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: |
From: chris davis <capedavis(at)yahoo.com>
Subject: Re: Kolb-List: free air rotax
To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com>
Date: Monday, May 27, 2013, 12:42 PM
William , No but I will . thanx
Chris Davis KXP 503 492 hrs Glider Pilot Disabled from crash building Firefly
| Quote: |
From: william sullivan <williamtsullivan(at)att.net>
To: kolb-list(at)matronics.com
Sent: Monday, May 27, 2013 11:04 AM
Subject: Re: free air rotax
Chris- Did you check Jack Hart's web site?
do not archive
--- On Mon, 5/27/13, chris davis <capedavis(at)yahoo.com> wrote:
| Quote: | kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis KXP 503 492 hrs Glider Pilot Disabled from crash building Firefly
| Quote: | http://www.matronics.com/Navigator?Kolb-ofollow" target="_blank" href="http://www.matronics.com/contribution">h
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| Quote: |
=nofollow target=_blank>http://www.matronics.com/Navigator?Kolb-List
et=_blank>http://forums.matronics.com/
llow target=_blank>http://www.matronics.com/contribution
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http://www.matronics.com/con================
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[quote][b]
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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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| Posted: Mon May 27, 2013 9:25 am Post subject: free air rotax |
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Don't do it, you'd just be asking for trouble. All three rotax fan cooled engines will overheat even in tractor applications without a good free air scoop and that's with the prop blowing right on them.
Put a fan cooled engine on your Kolb and you'll have no issues.
Dennis "Skid" RoweMk3, 690L-70, Leechburg, PA
PS:
I designed and used to sell Free Air scoops for Rotax engines and I would never have sold one for a pusher application.
On May 27, 2013, at 10:46 AM, chris davis <capedavis(at)yahoo.com (capedavis(at)yahoo.com)> wrote:
[quote]kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
| Quote: |
===================================
://www.matronics.com/Navigator?Kolb-List
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cs.com
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matronics.com/contribution
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[b]
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capedavis(at)yahoo.com
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| Posted: Mon May 27, 2013 10:55 am Post subject: free air rotax |
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Skid,Gotya I never had a problem with my 503 but will have to buy fan and shrouds for the 377 .The mech I bought it from said he never ran shrouds but it was a tractor any body got shrouds and a fan?
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
[quote] From: Dennis Rowe <rowedenny(at)windstream.net>
To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com>
Sent: Monday, May 27, 2013 1:24 PM
Subject: Re: free air rotax
Don't do it, you'd just be asking for trouble. All three rotax fan cooled engines will overheat even in tractor applications without a good free air scoop and that's with the prop blowing right on them.
Put a fan cooled engine on your Kolb and you'll have no issues.
Dennis "Skid" RoweMk3, 690L-70, Leechburg, PA
PS:
I designed and used to sell Free Air scoops for Rotax engines and I would never have sold one for a pusher application.
On May 27, 2013, at 10:46 AM, chris davis <capedavis(at)yahoo.com (capedavis(at)yahoo.com)> wrote:
| Quote: | kolbers, Anyone ever run a free air rotax on a KOLB aircraft?
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
| Quote: |
==========
://www.matronics.com/Navigator?Kolb-List
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cs.com
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matronics.com/contribution
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http://w="nofollow" target="_blank" href="http://forums.matronics.com/">http:/www.matronics.com/contribution">http://www.matronics.com/contribution============
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[b]
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wakataka
Joined: 11 Aug 2012
Posts: 48
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| Posted: Mon May 27, 2013 6:06 pm Post subject: Re: free air rotax |
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I run a free air 277 as a pusher, but I've had to dink with it a lot to make it happy. Melted two pistons before I figured out how to make it work. It's running richer than spec, but with synthetic oil the carbon build up is manageable. The 277 is easy to decarbon, so I just do it often. I don't think I'd try to run any of the two cylinder Rotax engines as a free-air pusher. On the 277, the fins on the head are aligned with the slipstream. On the others, I believe they are crosswise to the silpstream, which would not make for good cooling airflow.
You might consider getting the fan and shroud off a snowmobile engine. SkiDoo had 377's in their sleds from the mid eighties until the early 90's and maybe beyond. Most of the parts are interchangeable with the 377UL. I have a 377 from a 1992 Skandic. There is vent hose coming out of the cooling shroud that was routed to the exhaust pipe in the sled. When you remove it, you're left with a silver-dollar sized hole in the shroud that can be easily patched with a bit of sheet metal, like the lid from a soup can, for example. I bought the whole sled for $150 and sold parts off it to make back most of my investment, keeping just the engine, which I plan to build up as a spare for my Firestar.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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wakataka
Joined: 11 Aug 2012
Posts: 48
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capedavis(at)yahoo.com
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| Posted: Mon May 27, 2013 7:51 pm Post subject: free air rotax |
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Wakataka,I think thats what ill do ebay has a lot of 377 snow machine parts do they ever have tha Aluminum shrouds ? I found a complete fan assembly for $24
, so ill keep lookin Im not in a big hurry as I havent covered her yet probably take another year before I ll need an engine . thanks for your input sounds like you have been there
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
[quote]
From: wakataka <wakataka(at)charter.net>
To: kolb-list(at)matronics.com
Sent: Monday, May 27, 2013 11:12 PM
Subject: Re: free air rotax
--> Kolb-List message posted by: "wakataka" <wakataka(at)charter.net (wakataka(at)charter.net)>
There's a 377 shroud listed on E-bay. It's off a sled motor. You can see the hole I mentioned in my previous post.
http://www.ebay.com/itm/377-447-Rotax-Engine-Tins-/140985842083?pt=Motors_Aviation_Parts_Gear&hash=item20d36939a3&vxp=mtr
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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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=401455#401455
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[b]
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wakataka
Joined: 11 Aug 2012
Posts: 48
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| Posted: Mon May 27, 2013 8:05 pm Post subject: Re: free air rotax |
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Chris - I'm not a snowmobile expert, but I don't believe the aluminum shrouds were ever used on sleds. Weight is not a big issue there and aluminum is more expensive and not as durable as steel. I think many if not most of the newer Rotax UL engines use the steel shrouds. I've only seen aluminum ones on the older UL engines.
Keep in mind that sleds often used dual carburetors, so the shrouds on the carb side might need some modification if you went with the single carb UL set up. I'm not sure if there was ever a single carb sled motor or not.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Mark Twain |
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