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willie.harrison(at)tinyon
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 Posted: Wed Jan 18, 2006 6:20 am Post subject: Carb heat mod |
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What experience does anyone else have of carb icing on Rotax powered
Europas? I had thought that the standard set up was supposed to be
largely immune but I encountered some serious icing yesterday. In the
cruise at 5,200 rpm, 5000 feet, outside air temp approx zero, in clear
air above broken cloud. First of all there was a steady loss of rpm to
4.800 at the same throttle setting and then when full power was applied
for 30 seconds there were two "kerthumps", presumably as the two carbs
lobbed their two ice cubes into the engine. Fuel is 100% avgas. Coolant
and oil were both running at approx 80C.
The only thing I can think of which is non standard with the way mine is
built is that the inlet air filter has been re-positioned to be directly
in line with the NACA inlet so there is no chance for the inlet air to
swirl around under the cowlings to pick up some heat. Has anyone else
heard of this mod?
What is anyone's experience with carb heaters on this engine?
Cheers
Willie Harrison
G-BZNY - now piling on the hours after some grim teething troubles....
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j.heijboer(at)vmij.nl
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| Posted: Wed Jan 18, 2006 7:49 am Post subject: Carb heat mod |
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Willie,
Would be nice to know which type of rotax you are refering too.
Regards jack H
-----Oorspronkelijk bericht-----
Van: owner-europa-list-server(at)matronics.com
[mailto:owner-europa-list-server(at)matronics.com]Namens willie harrison
Verzonden: woensdag 18 januari 2006 15:18
Aan: europa-list(at)matronics.com
Onderwerp: RE: Carb heat mod
What experience does anyone else have of carb icing on Rotax powered
Europas? I had thought that the standard set up was supposed to be
largely immune but I encountered some serious icing yesterday. In the
cruise at 5,200 rpm, 5000 feet, outside air temp approx zero, in clear
air above broken cloud. First of all there was a steady loss of rpm to
4.800 at the same throttle setting and then when full power was applied
for 30 seconds there were two "kerthumps", presumably as the two carbs
lobbed their two ice cubes into the engine. Fuel is 100% avgas. Coolant
and oil were both running at approx 80C.
The only thing I can think of which is non standard with the way mine is
built is that the inlet air filter has been re-positioned to be directly
in line with the NACA inlet so there is no chance for the inlet air to
swirl around under the cowlings to pick up some heat. Has anyone else
heard of this mod?
What is anyone's experience with carb heaters on this engine?
Cheers
Willie Harrison
G-BZNY - now piling on the hours after some grim teething troubles....
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rholder(at)avnet.co.uk
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| Posted: Wed Jan 18, 2006 8:58 am Post subject: Carb heat mod |
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Jeremy Davey wrote:
| Quote: | It's my understanding that carb icing is not a problem
on Rotaxes _with_heated_carbs_. I've certainly heard of
problems on Rotaxes with no carb heat. There are two
ways I know of of doing this - one is sold over here in
the UK by the Rotax agents Skydrive and uses the engine
coolant to heat the carb body, the other uses
electrical heating of the carb body (I think a recent
issue of Popular Flying had details).
|
The one in Popular Flying has not been approved as a Mod yet !
My 912S with the carb heaters still gave some symptoms of
carb ice when the water temperature wasn't high enough.
| Quote: | Note that neither uses heating of the induction air!
Hence there is no power loss and they are usually
permanently engaged.
|
There is a third way. On the Polish AT3 visible at North
Weald, which I had some dealings with, the 912S has a full
carb air heat system installed along with a cabin heater
(using the exhaust silencer [muffler] warmth).
Now that I woud like on a brrrrr freezing day up there !
Richard
Tri-gear G-OWWW High Cross
WIth oil thermostat fitted waiting fro a flyable day to test !
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terrys(at)cisco.com
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| Posted: Wed Jan 18, 2006 10:02 am Post subject: Carb heat mod |
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Hi,
We have a mono-wheel XS with 912S and Skydrive carb heaters. We
initially left the carb heat on all the time, but found it can cause hot
starting problems if left on prior to shutdown. We then installed a
water valve to the heaters, turning the carb heat on only when needed.
Since then we have had carb ice on the ground and in the air. In all
cases, the carb ice went away immediately after turning the heat back
on.
We also found, through careful testing, that there is indeed no loss
of power with the carb heat on.
Regards,
Terry Seaver
A135 / N135TD
--
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SPurpura(at)AOL.COM
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| Posted: Wed Jan 18, 2006 6:30 pm Post subject: Carb heat mod |
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912 or 914 power?
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rholder(at)avnet.co.uk
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| Posted: Thu Jan 19, 2006 1:25 am Post subject: Carb heat mod |
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As I understand it the 914 doesn't need one because of the
forced induction.
So carb heaters on 912 and 912S only.
Richard
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willie.harrison(at)tinyon
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| Posted: Sat Jan 21, 2006 7:19 am Post subject: Carb heat mod |
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912uls
--
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