As stated by others the charging/ electrical power coils are separate from the
ignition coils - basically as long as the engine is turning there will be power
to the ignition circuit.
We had an instance not so long ago where the ignition switch failed to short out
the ignition circuit and the engine continued to run even though we had switched
everything off. This is the normal arrangement for the majority of aircraft
systems (ie: ignition will function even if the switch fails). The only way
to stop the engine is to shut off the fuel.
I'm a little puzzled though as to why the Rotax 914 has electric fuel pumps
instead
of the mechanical pump used on the 912 - anyone know the reason for this
- or is a mechanical fuel pump optional.
I had a look at the Rotax brochure on the 914 and the photo would suggest that
a mechanical pump could be fitted if desired.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of David Joyce
Sent: 12 October 2013 09:12
Subject: Re: Europa-List: Re: Battery questions
--> <davidjoyce@doctors.org.uk>
Alan, I get the impression that you are doing your very best to reinvent the
wheel
here. It ain't bust! Why try and fix it? David Joyce
"Alan Carter" <alancarteresq@onetel.net> wrote:
><alancarteresq@onetel.net>
>
> Hi David.
> You have flown to some wonderful places, Im UK only no longer have
>that confidence, when i was in my 20s yes I would have.
> Im no expert on the plane never looked into it, but all the planes I
>have flown the engine is entirely separate from the aircrafts electrics
>and you have just confirmed that with Master off and Alternator off and
>the a pump and spark keeps the engine going, or should do.
> So the spark is not influenced by either switch, and the pump get it
>power from either a separate circuit within the Alternator or the
>battery which will slowly run down.
> Rotax must say somewhere how long you have on battery and pump only.
> or maybe not?
> We know with the Master and Alternator off the engine will run OK.
> But with a serviceable system how do I check its failure capabilities
>??
>
> Regards
> Alan
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=410354#410354
>
>
>
>
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