---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 03/24/15: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:45 AM - Re: Z12 vs Z13-8 (user9253) 2. 02:55 PM - Re: Re: Z12 vs Z13-8 (Robert L. Nuckolls, III) 3. 05:38 PM - Re: Re: Z12 vs Z13-8 (Larry Rosen) ________________________________ Message 1 _____________________________________ Time: 06:45:01 AM PST US Subject: AeroElectric-List: Re: Z12 vs Z13-8 From: "user9253" Choosing the size of the backup alternator is a matter of personal preference. There is no right or wrong answer. My preference is to keep weight down. If a PC680 will crank your engine, then how about installing that instead of the PC925, along with the larger backup alternator? There was a discussion about batteries for the RV-10 on VansAirforce: http://www.vansairforce.com/community/showthread.php?t=76315 and on the Matronics AeroElectric List: http://forums.matronics.com/viewforum.php?f=3&topicdays=0&start=2250 and http://forums.matronics.com/viewforum.php?f=3&topicdays=0&start=2175 Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=439824#439824 ________________________________ Message 2 _____________________________________ Time: 02:55:10 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Z12 vs Z13-8 At 08:43 2015-03-24, you wrote: > >Choosing the size of the backup alternator is a matter of personal >preference. There is no right or wrong answer. But I think there is an 'elegant' answer . . . based on design goals and numbers to guide and validate the final decision. I missed the 925 selection. THAT IS a beefy battery. The rough numbers offered suggested that design goals call for the battery to carry a lot more loads than I would have expected. Hence, my suggestion that he back up and sort the numbers against anticipated flight configurations. For it is those numbers that show the adequacy of alternators and batteries being considered. I'd bet that the stock SD-8 and a PC-680 would get the job done . . . but that's my perception of 'the job' which may differ markedly from his. Until we have the numbers, we're all blow'n smoke. Bob . . . ________________________________ Message 3 _____________________________________ Time: 05:38:10 PM PST US From: Larry Rosen Subject: Re: AeroElectric-List: Re: Z12 vs Z13-8 I have gone through a complete analysis of every electric component and looked at the loads for different flight configurations. For simplicity I only showed a range for my normal loads and what I had for an endurance mode. I was looking for a review of my analysis and everyone has helped me with that. The endurance design I have is a 'keep the coffee pot warm' design and not a 'safe for flight' design. My struggle is wanting to make the alternator out situation a 'non event' with all or most of the conveniences I will have in the plane. Making the endurance mode a 'safe for flight' mode would drastically cut that loads. Designing for 'non-event' vs 'safe for flight' is drastically different. I will need to go back and determine what my design goal is. Larry On 3/24/2015 5:53 PM, Robert L. Nuckolls, III wrote: > > > At 08:43 2015-03-24, you wrote: >> >> Choosing the size of the backup alternator is a matter of personal >> preference. There is no right or wrong answer. > > But I think there is an 'elegant' answer . . . based > on design goals and numbers to guide and validate > the final decision. > > I missed the 925 selection. THAT IS a beefy battery. > The rough numbers offered suggested that design > goals call for the battery to carry a lot more > loads than I would have expected. > > Hence, my suggestion that he back up and sort the > numbers against anticipated flight configurations. > For it is those numbers that show the adequacy of > alternators and batteries being considered. > > I'd bet that the stock SD-8 and a PC-680 would get > the job done . . . but that's my perception of 'the > job' which may differ markedly from his. Until > we have the numbers, we're all blow'n smoke. > > > Bob . . . > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-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/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-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.