---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sat 10/12/13: 4 ---------------------------------------------------------- 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 _____________________________________ Time: 01:12:51 AM PST US From: "David Joyce" Subject: Re: Europa-List: 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" wrote: > > > 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 _____________________________________ Time: 02:30:04 AM PST US From: "craig" Subject: RE: Europa-List: 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 _____________________________________ Time: 08:23:38 AM PST US From: "Carl Pattinson" Subject: RE: Europa-List: 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 --> 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" wrote: > > > 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 _____________________________________ Time: 10:41:10 AM PST US Subject: Europa-List: Re: Battery questions From: "Alan Carter" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.