Today's Message Index:
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1. 04:18 AM - Re: Re: batteries (Hugh)
2. 11:56 AM - Re: Re: batteries (David Joyce)
Message 1
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I keep hearing about the poor service life of the standard regulator that is
provided by Rotax on their 912s. What is "poor service life" (i.e how long
does it last)?
Hugh McKay
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Gilles
Thesee
Sent: Friday, February 15, 2008 9:45 PM
Subject: Re: RotaxEngines-List: Re: batteries
<Gilles.Thesee@ac-grenoble.fr>
> The Hawker SBS-8 and the PC310 are made by the same company I believe. The
SBS-8 is a little hard to come by and both batteries cost about $140.
Roger,
Interesting data about those two batteries.
> Be careful when talking about the 914 and the 912 as they do have some
different requirements and needs. I am not sure if the battery is one of
those items.
The alternator and charging system are the same in the 912 and the 914.
Some info on regulator tests here :
http://contrails.free.fr/elec_ducati_en.php
The 914 needs dual power sources in order to achieve redundancy, as
both pumps are electrical, making the engine "electrically dependent".
> You would need to consult the Rotax manual.
Better yet, the proposed architectures on http://www.aerolectric.com.
The diagram shown on the Rotax 914 manual do not provide real electrical
redundancy, considering the regulator poor service life record.
Best regards,
--
Gilles
http://contrails.free.fr
Message 2
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Gilles There is a form of redundancy in the 914 with a single battery. If
wired the Europa recommended way, one fuel pump is powered by the
alternator, with take off between the alternator and the alternator switch,
and the other is powered by battery power, downstream from the main
electrical switch. This means that with both main and alternator switch off
the engine keeps working. With the alternator shot or the regulator failed,
the other will work as long as battery life allows. Clearly you could be
struck by lightning and every wire burnt out but I suspect for most purposes
and eventualities one or other pump will continue to function
Regards, David Joyce, G-XSDJ
----- Original Message -----
From: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Sent: Saturday, February 16, 2008 2:45 AM
Subject: Re: RotaxEngines-List: Re: batteries
<Gilles.Thesee@ac-grenoble.fr>
>
> > The Hawker SBS-8 and the PC310 are made by the same company I believe.
The SBS-8 is a little hard to come by and both batteries cost about $140.
>
> Roger,
>
> Interesting data about those two batteries.
>
> > Be careful when talking about the 914 and the 912 as they do have some
different requirements and needs. I am not sure if the battery is one of
those items.
>
> The alternator and charging system are the same in the 912 and the 914.
> Some info on regulator tests here :
> http://contrails.free.fr/elec_ducati_en.php
> The 914 needs dual power sources in order to achieve redundancy, as
> both pumps are electrical, making the engine "electrically dependent".
>
> > You would need to consult the Rotax manual.
>
> Better yet, the proposed architectures on http://www.aerolectric.com.
> The diagram shown on the Rotax 914 manual do not provide real electrical
> redundancy, considering the regulator poor service life record.
>
> Best regards,
> --
> Gilles
> http://contrails.free.fr
>
>
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