Today's Message Index:
----------------------
1. 02:43 AM - Re: Rotax 914 (jetboy)
2. 04:22 AM - Re: carb ice revisited (Thom Riddle)
3. 07:40 AM - Re: carb ice revisited (Roger Lee)
4. 07:56 AM - Re: Rotax 914 (Gilles Thesee)
5. 01:18 PM - Re: carb ice revisited (Thom Riddle)
6. 02:28 PM - Re: Re: carb ice revisited (Noel Loveys)
Message 1
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I would be cautious about grounding both ends of the cable shields because of what
can occur to components of the ignition system when operating the starter
motor.
Depending where the battery is located and how it is grounded and connected to
the starter motor frame there can be 1 or 2 volts appearing between parts of the
engine casing and the rest of the airframe. During cranking there is a large
current available here, certainly enough to vaporise any electronic parts that
might be in the way. The point about earth straps across 2 or more lord mounts
is a valid one too, I once had starting troubles on a C150 and discovered
neither of the straps were present, meaning the entire 2-300 amps was going thru
the throttle , mixture and maybe carb ht. controls!
Ralph
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5239#205239
Message 2
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| Subject: | Re: carb ice revisited |
Roger,
You are not a smart ass. You just live in a place where 50% humidity seems like
a steam bath. Back east, where we have enough rain to allow trees to grow, 50%
humidity seems down right arid.
I've been flying since 1966 and I know the symptoms of carb ice. That is how I
know I've had it. It is true that the Bing carbs are LESS LIKELY to ice up but
they can and do under high humidity conditions. I've had it happen to me on two
separate occasions, both of which were in conditions highly conducive to carb
ice. Although it is rare enough that I don't bother with a carb heat system,
it does happen here in the land of "normal" humidity :-).
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N1208P RANS S6S, Tailwheel, 912UL
N197BG FS1/447
--------------------
Scratch any cynic, he said, and youll find a disappointed idealist.
George Carlin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5244#205244
Message 3
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| Subject: | Re: carb ice revisited |
Hi Thom,
If you ever make it down to the Tucson, Az. area give me a call. I'll be happy
to take you and whom ever up in my Flight Design CT for a flight around the area
in some of that dry air. :D
I have a friend that lives in New York that I'm sure he would be happy to take
you for a cruise in his CT.
Invites good any time.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5278#205278
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Fergus Kyle a crit :
> Hello,
> I am assembling the wiring for the above model engine. In the
> process, I wired the dynamo module wires to coaxial cable which runs to the
> ignition switches, ensuring that the coax braid is exclusively connected to
> nearby engine ground at one end and one pole of each switch at the other.
> The switches are enclosed in small alum boxes attached to the panel for
> interference protection.
> I see, by Installation manual, page 75 [electric circuit, d/1996 05
> 10] that there seems to be an electrical ground connection to the switch
> frame and thus to the metal panel on which it is fixed. If that is so, then
> the engine frame ground extends into the cockpit via the coax.
> Is this the intent?
>
Fergus,
FWIW, I wired one 914 and one 912S engines as per the Rotax installation
manual with good results.
At the time I too was a bit puzzled by the Rotax suggestion to ground
the shield at both ends, but after much reflexion decided to wire the
ignition by the book.
Worked flawlessly.
Some info here
http://contrails.free.fr/engine_rotax_mag_connect_en.php
Best regards,
--
Gilles
http://contrails.free.fr
Message 5
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| Subject: | Re: carb ice revisited |
Thanks for the offer, Roger. If I get down your way again, I'll look you up.
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N1208P RANS S6S, Tailwheel, 912UL
N197BG FS1/447
--------------------
Scratch any cynic, he said, and youll find a disappointed idealist.
George Carlin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5303#205303
Message 6
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| Subject: | Re: carb ice revisited |
So true. But sho0rt of landing immediately and pulling off the air screens
there is no other way to verify ice in the carb other than through symptoms.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: Friday, September 19, 2008 10:18 PM
Subject: RotaxEngines-List: Re: carb ice revisited
Hi Guys,
Please don't take my next comment as being a smart ass, but how do you guys
know if it was really icing without any confirmation and have you ruled out
all other possibilities? Without confirmation it still is speculation. These
are not standard carbs like the ones we were raised with during our life,
but quite different. These are variable venturi carbs. That in itself makes
them less prone to standard icing effects.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5184#205184
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