---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sat 02/16/08: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:18 AM - Re: Re: batteries (Hugh) 2. 11:56 AM - Re: Re: batteries (David Joyce) ________________________________ Message 1 _____________________________________ Time: 04:18:44 AM PST US From: "Hugh" Subject: RE: RotaxEngines-List: Re: batteries 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 > 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 _____________________________________ Time: 11:56:23 AM PST US From: "David Joyce" Subject: Re: RotaxEngines-List: Re: batteries 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" Sent: Saturday, February 16, 2008 2:45 AM Subject: Re: RotaxEngines-List: Re: batteries > > > 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 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.