Today's Message Index:
----------------------
1. 07:39 AM - Capacitor (george.mueller@aurora.org)
2. 01:41 PM - Re: Capacitor (Dave)
3. 05:00 PM - Re: Capacitor (Jack Kuehn)
4. 06:43 PM - Re: Capacitor (Thilo Kind)
5. 06:55 PM - Re: Capacitor (NYTerminat@aol.com)
Message 1
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I am installing a Rotax 912 in a Zenith 701. I see some installations
with a capacitor and some without. Recent posts have indicated a downside
to the capacitor in that it can cause some problems if the alt switch is
shut off with the engine running. What are the pros and cons of the
capacitor?
George in Milwaukee
Zenith 701 912
Message 2
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I've had no problems with my installation; although, my capacitor is
slightly smaller than the one specified by Rotax. I also added an
over-voltage protection circuit to my system as recommended by Bob at
Aeroelectric. I purchased both from him.
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com]On Behalf Of
george.mueller@aurora.org
Sent: Wednesday, February 14, 2007 9:38 AM
To: rotaxengines-list@matronics.com
Subject: RotaxEngines-List: Capacitor
I am installing a Rotax 912 in a Zenith 701. I see some installations
with a capacitor and some without. Recent posts have indicated a downside
to the capacitor in that it can cause some problems if the alt switch is
shut off with the engine running. What are the pros and cons of the
capacitor?
George in Milwaukee
Zenith 701 912
Message 3
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I also installed components from Bob at AeroElectric, including the over
voltage protector and the capacitor. As I understood it, without the
capacitor, if for some reason the battery was disconnected from the
system while the engine was running, with no capacitor, the engine will
quit, while with it, it will keep running. I was basically so impressed
by Bob's design approach, which is essentially: "if it can break,
eventually it will, so either design a backup or make the system
inessential for continued flight." I have no problems with any of this
stuff, and running the engine on BATT only is no problem as far as I
know. Bob would be the guy to ask about this!
Jack
Dave wrote:
> I've had no problems with my installation; although, my capacitor is
> slightly smaller than the one specified by Rotax. I also added an
> over-voltage protection circuit to my system as recommended by Bob at
> Aeroelectric. I purchased both from him.
>
> -----Original Message-----
> *From:* owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com]*On Behalf Of
> *george.mueller@aurora.org
> *Sent:* Wednesday, February 14, 2007 9:38 AM
> *To:* rotaxengines-list@matronics.com
> *Subject:* RotaxEngines-List: Capacitor
>
>
> I am installing a Rotax 912 in a Zenith 701. I see some
> installations with a capacitor and some without. Recent posts
> have indicated a downside to the capacitor in that it can cause
> some problems if the alt switch is shut off with the engine
> running. What are the pros and cons of the capacitor?
>
>
> George in Milwaukee
> Zenith 701 912
>
>*
>
>href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.matronics.com/Navigator?RotaxEngines-List
>href="http://forums.matronics.com">http://forums.matronics.com
>
>*
>
>*
>
>
>*
>
--
Jack Kuehn
5565 Brady Lane
Lolo, MT 59847
(406) 273-6801
(406) 546-1086 (cell)
(406) 273-2563 (fax)
Message 4
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Hi there,
I have the standard capacitor installed as per Rotax recommendation. 5 years with
no problem so far.
I don't understand why the engine should quit, when the battery is disconnected.
The ignition system of the Rotax is totally independend of the electrical system.
The engine will keep running with the master switch off (which essentially
disconnects the battery).
The capacitor is required to smoothen out any waviness in the current coming from
the alternator, which might cause problems with the avionics and introduce
funny sounds in the headsets.
Thilo Kind
-------- Original-Nachricht --------
Datum: Wed, 14 Feb 2007 17:59:49 -0700
Von: Jack Kuehn <jkuehn@mountaintime.myrf.net>
An: rotaxengines-list@matronics.com
CC:
Betreff: Re: RotaxEngines-List: Capacitor
> <jkuehn@mountaintime.myrf.net>
>
> I also installed components from Bob at AeroElectric, including the over
> voltage protector and the capacitor. As I understood it, without the
> capacitor, if for some reason the battery was disconnected from the
> system while the engine was running, with no capacitor, the engine will
> quit, while with it, it will keep running. I was basically so impressed
> by Bob's design approach, which is essentially: "if it can break,
> eventually it will, so either design a backup or make the system
> inessential for continued flight." I have no problems with any of this
> stuff, and running the engine on BATT only is no problem as far as I
> know. Bob would be the guy to ask about this!
>
> Jack
>
> Dave wrote:
>
> > I've had no problems with my installation; although, my capacitor is
> > slightly smaller than the one specified by Rotax. I also added an
> > over-voltage protection circuit to my system as recommended by Bob at
> > Aeroelectric. I purchased both from him.
> >
> > -----Original Message-----
> > *From:* owner-rotaxengines-list-server@matronics.com
> > [mailto:owner-rotaxengines-list-server@matronics.com]*On Behalf Of
> > *george.mueller@aurora.org
> > *Sent:* Wednesday, February 14, 2007 9:38 AM
> > *To:* rotaxengines-list@matronics.com
> > *Subject:* RotaxEngines-List: Capacitor
> >
> >
> > I am installing a Rotax 912 in a Zenith 701. I see some
> > installations with a capacitor and some without. Recent posts
> > have indicated a downside to the capacitor in that it can cause
> > some problems if the alt switch is shut off with the engine
> > running. What are the pros and cons of the capacitor?
> >
> >
> >
> >
> > George in Milwaukee
> > Zenith 701 912
> >
> >*
> >
> >href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.matronics.com/Navigator?RotaxEngines-List
> >href="http://forums.matronics.com">http://forums.matronics.com
> >
> >*
> >
> >*
> >
> >
> >*
> >
>
> --
> Jack Kuehn
> 5565 Brady Lane
> Lolo, MT 59847
>
> (406) 273-6801
> (406) 546-1086 (cell)
> (406) 273-2563 (fax)
>
>
>
>
--
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Message 5
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In a message dated 2/14/2007 9:44:02 P.M. Eastern Standard Time,
thilo.kind@gmx.net writes:
Betreff: Re: RotaxEngines-List: Capacitor
> --> RotaxEngines-List message posted by: Jack Kuehn
> <jkuehn@mountaintime.myrf.net>
>
As I understood it, without the
> capacitor, if for some reason the battery was disconnected from the
> system while the engine was running, with no capacitor, the engine will
> quit, while with it, it will keep running.
The charging circuit is independent of the ignition. It has nothing to do
with keeping the engine running. The capacitor is there to alleviate any
spikes from the charging dynamo.
I was basically so impressed
> by Bob's design approach, which is essentially: "if it can break,
> eventually it will, so either design a backup or make the system
> inessential for continued flight." I have no problems with any of this
> stuff, and running the engine on BATT only is no problem as far as I
> know. Bob would be the guy to ask about this!
The battery is not needed to keep the engine running.
>
> Jack
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