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drop of rpm on take off

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georg.stiller(at)arcor.de
Guest

Posted: Sun Feb 13, 2011 2:46 pm Post subject: drop of rpm on take off

Hi all,

bad news! Another flight today: minus 10 centigrade, very dry. RMP on take off run 4900 (100-200 low), initial climb with 5100-5200. After 20 seconds or so, sudden rpm drop by 5 - 700. I reduced power, flew for a minute with 4000 rpm, slowly increased to full power, some seconds later again drastic drop of rpm. Landed the aircraft with no problem.

Flight was done with full carb heat all the time - quite ineffective, however.

The engine was not running rough or coughing, just a sudden loss of power.

Next I will change the spark plungs.

Any good ideas left?

Regards, Georg

Kitfox, Germany



----- Original Nachricht ----

Von:     georg.stiller(at)arcor.de

An:      rotaxengines-list(at)matronics.com

Datum:   23.01.2011 17:23

Betreff: drop of rpm on take off



Hi,

I started this thread on January, 4. I should like to thank for the advise and report on my findings:

I changed the needle in the carb from pos. 3 to 4 and made some testflights at 5 - 6 centigrade below zero with carb heat pulled. There was no trouble, no rpm drop anymore. Power output is okay. Carb heat is nearly ineffective, however, as I checked the temperature in the air box with a digital thermometer and there was virtually no difference with or without carb heat.

So the needle position obviously fixed the problem.

I have now a little problem with the warm start of the engine. Seems to be running somewhat rich, a little bit of grey smoke from the exaust when the engine catches.

Thanks again!

Regards, Georg

Kitfox, Rotax 912

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thilo.kind(at)gmx.net
Guest

Posted: Sun Feb 13, 2011 9:46 pm Post subject: drop of rpm on take off

Hi Georg,

 

had the same a while back with my Zodiac Ch 601 HDS / Rotax 912 UL. Turned out, that the choke on one of the carbs would open only so slightly, causing a drop in RPM.

 

Cheers

 

Thilo

 

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of georg.stiller(at)arcor.de

Sent: Sonntag, 13. Februar 2011 23:43

To: rotaxengines-list(at)matronics.com

Subject: drop of rpm on take off

 

--> RotaxEngines-List message posted by: georg.stiller(at)arcor.de (georg.stiller(at)arcor.de)



Hi all,

bad news! Another flight today: minus 10 centigrade, very dry. RMP on take off run 4900 (100-200 low), initial climb with 5100-5200. After 20 seconds or so, sudden rpm drop by 5 - 700. I reduced power, flew for a minute with 4000 rpm, slowly increased to full power, some seconds later again drastic drop of rpm. Landed the aircraft with no problem.

Flight was done with full carb heat all the time - quite ineffective, however.

The engine was not running rough or coughing, just a sudden loss of power.

Next I will change the spark plungs.

Any good ideas left?

Regards, Georg

Kitfox, Germany



----- Original Nachricht ----

Von:     georg.stiller(at)arcor.de

An:      rotaxengines-list(at)matronics.com

Datum:   23.01.2011 17:23

Betreff: drop of rpm on take off



Hi,

I started this thread on January, 4. I should like to thank for the advise and report on my findings:

I changed the needle in the carb from pos. 3 to 4 and made some testflights at 5 - 6 centigrade below zero with carb heat pulled. There was no trouble, no rpm drop anymore. Power output is okay. Carb heat is nearly ineffective, however, as I checked the temperature in the air box with a digital thermometer and there was virtually no difference with or without carb heat.

So the needle position obviously fixed the problem.

I have now a little problem with the warm start of the engine. Seems to be running somewhat rich, a little bit of grey smoke from the exaust when the engine catches.

Thanks again!

Regards, Georg

Kitfox, Rotax nbsp;      - The RotaxEngines-List Email Forum href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.Same great content also available via the Web href="http://forums.matronics.com">http://forums.matronics.com

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