---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 08/22/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:48 AM - Re: Adding an electrical system (Robert L. Nuckolls, III) 2. 12:28 PM - Re: Re: Recording a NMEA GPS stream (Peter Pengilly) ________________________________ Message 1 _____________________________________ Time: 05:48:38 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Adding an electrical system At 11:14 PM 8/21/2012, you wrote: I am adding an electrical system to a PT-22 per a customer's request. It will consist of an overhauled Eclipse Y-150 starter, a RG battery, starter switch and contactor, a switched bus to power a Becker radio and transponder, a wind driven generator, and associated wiring. Does anyone have experience with adding electrical to a PT-22? Any gotchas? I can't find any generator or alternator that is approved for the PT engine, that's the reason for the wind generator. It will only produce about 5 amps, so it will barely power the transponder and slowly recharge the battery and allow occasional radio transmission. Since I'm doing a form 337 for the change, I should be able to use any battery. So, we're considering a PC-680 or a lithium ion battery such as the Aerovoltz. Otherwise, we'll us a RG-35AXC. What are your design goals for the installation and how do you envision it will be used operationally? Will this airplane be used for cross-country flight? Is it parked in a location serviced by AC mains power? Keep in mind that cranking an engine from the typical battery takes only 5% or so of that battery's capacity. Transponders take typically 2 amps to operate when generating lots of replies. If I recall correctly, the Becker was designed for battery only ops in gliders. It's power demans are: Standby" reception mode =A3 70 mA Reception mode =A3 500 mA Transmission mode =A3 2.5 A Energy demands for this instance are trivial. Further, it has a low voltage warning built in set to trigger at 10.5 volts. http://tinyurl.com/9upvqxg An RG-35 is a beast of a battery . . . 30+ pounds as I recall. B&C did some cranking tests on the SMALLER cousin to the PC-680 and found that it would do a 10-blade crank of a high compression engine (aerobatic aircraft), 5 times in a row (with about a minute cool down between events). The PC-680 should do better yet. How about NO generator, a PC-680 as the only battery and a Battery Minder plugged in while the airplane is parked? Li-FePOH batteries are low risk because you're not going to charge it at a high rate while airborne . . . and it can be recharged at a benign rate while hangared. But take care also that you do not heavily discharge it between flights as they're more sensitive to deep cycle damage than their SVLA cousins. Bob . . . ________________________________ Message 2 _____________________________________ Time: 12:28:17 PM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: Re: Recording a NMEA GPS stream Cool, thanks! On 22/08/2012 00:11, Brantel wrote: > > I made one of these a while back. Works great! > > http://www.vansairforce.com/community/showthread.php?t=84045 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=381485#381485 > > ------------------------------------------------------------------------------------- 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.