Today's Message Index:
----------------------
1. 01:12 AM - Re: Re: Battery questions (David Joyce)
2. 02:30 AM - Re: Re: Battery questions (craig)
3. 08:23 AM - Re: Re: Battery questions (Carl Pattinson)
4. 10:41 AM - Re: Battery questions (Alan Carter)
Message 1
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| Subject: | Re: Battery questions |
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
On Fri, 11 Oct 2013 15:18:14 -0700
"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
>
>
>
>
>
>
>
>Un/Subscription,
>Forums!
>Admin.
>
>
>
Message 2
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| Subject: | Re: Battery questions |
Please keep in mind also that most fully wound type alternators will continue to
charge
As long as their speed is above about 800 rpm, even if the battery is completely
removed
>From the system, so on a permanent magnet alternator the result would be the same,
so as long
As the electric fuel pump and ignition (for the non magneto users) feed directly
from the alternator which I believe someone Said is the case then you should
be able to turn off the master and keep flying, shouldnt you?
Message 3
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| Subject: | Re: Battery questions |
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
On Fri, 11 Oct 2013 15:18:14 -0700
"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
>
>
>
>
>
>
>
>Un/Subscription,
>Forums!
>Admin.
>
>
>
Message 4
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| Subject: | Re: Battery questions |
Hi Carl.
If you look back a few post Frans gave an explanation of why the 914 has electric
pump,
No David not trying to invent the wheel, but its as I thought in the first place
the Master switch has no part to play in keeping the engine running,
It all started from why is there no Mechanical Pump on the 914 , Rotax opted for
a Dual electrical system, Personally I like Alternative system, ie
Air, hydraulic, Mechanical, Vacuum, so I think the 912 has a better system, My
Choice is, Alternative systems,
Regards.
Alan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=410402#410402
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