---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 02/13/11: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:07 AM - Re: Re: regulators (Richard Girard) 2. 02:46 PM - drop of rpm on take off (georg.stiller@arcor.de) 3. 09:46 PM - Re: drop of rpm on take off (Thilo Kind) ________________________________ Message 1 _____________________________________ Time: 06:07:23 AM PST US Subject: Re: RotaxEngines-List: Re: regulators From: Richard Girard Ross, Pay special attention to the capacitor. It's the protection for the regulator. The proper size can be had from B & C Specialties, Mouser, Allied, or others but you really should upgrade to the 25000 mfd min. size. Rick On Sat, Feb 12, 2011 at 8:12 PM, dashwood wrote: > dashwoodlock@hotmail.com> > > thanks. i was not able to find the pages i needed before. i think the fuse > i have blown is the 25A after the reg terminals. the capacitor is in place > and should have protected the reg as/per manual. when you close 16(master) > then 19 relay pulls on the battery supply to fuse bus. i have an endurance > fuse bus as well. somehow an alternator disconnect that draws minimal power > only from battery to supply minimal flight requirements. i assume to guard > against over voltage (failed reg). i don't see this in the diagram. not sure > if master has to be shut off first to stop feedback( blowing the 25A fuse). > i just want to understand what is happening so i can fix or not have happen > in flight again. > > -------- > Ross Aalexander: CH701 driver 912ul 450tt > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=330827#330827 > > -- Zulu Delta Mk IIIC Thanks, Homer GBYM It isn't necessary to have relatives in Kansas City in order to be unhappy. - Groucho Marx ________________________________ Message 2 _____________________________________ Time: 02:46:12 PM PST US From: georg.stiller@arcor.de Subject: RotaxEngines-List: 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@arcor.de An: rotaxengines-list@matronics.com Datum: 23.01.2011 17:23 Betreff: RotaxEngines-List: 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 ________________________________ Message 3 _____________________________________ Time: 09:46:50 PM PST US From: "Thilo Kind" Subject: RE: RotaxEngines-List: 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@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of georg.stiller@arcor.de Sent: Sonntag, 13. Februar 2011 23:43 Subject: RotaxEngines-List: 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@arcor.de An: rotaxengines-list@matronics.com Datum: 23.01.2011 17:23 Betreff: RotaxEngines-List: 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 _____ eMail ist virenfrei. 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