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
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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 <dashwoodlock@hotmail.com> 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
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| 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@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
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| 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@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
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