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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Thu Sep 04, 2008 6:02 am Post subject: Mixture control for Bing |
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Morning Gang:
Got a bc from Jerry Olenik reference his in flight adustable carb set up.
Give Jerry a call if interested.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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jvanlaak(at)aol.com
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| Posted: Thu Sep 04, 2008 7:06 am Post subject: Mixture control for Bing |
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I have a pair of these carburetors that I do not need. Essentially new condition. Email off list if interested.
Jim
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Ricochet
Joined: 29 May 2008
Posts: 36
Location: Fresno, CA
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| Posted: Thu Sep 04, 2008 11:06 am Post subject: Mixture control for Bing |
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Guys,
Some of our local pilots used these adjustable needles, but none are now, perhaps because we don't hear about them anymore. One pilot had an engine-out and off-field landing because he adjusted the carb at altitude and forgot to readjust when he later descended. Two cycles don't tolerate lean conditions all that well. I found with them that when jetted for sea level I could fly to any altitude, including 10 to 12k without problem, though likely greater fuel burn and slightly less power at higher altitudes.
My .02.
Jerry
Fresno
[quote][b]
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Thu Sep 04, 2008 12:45 pm Post subject: Re: Mixture control for Bing |
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I have the Arctic Sparrow adjustable needles in the carbs on a 503. I find that I don't make adjustments in flight any more.
The reason I installed them was to richen the mid rage (3000-4800 RPM) to keep EGT within limits on descents with partial power. It does increase pilot work load and is easy to turn one the wrong way, get confused, then turn the wrong carb needle, forget which way you turned it, and end up with a rough running engine.
It takes too much attention watching the EGT...it lags a few seconds behind the needle adjustment...to make sure you adjusted correctly when you should have your head up looking outside the airplane.
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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