Interesting question. I am looking at the feasibility of an electric powered glider, either sustainer or launch.
There are a number of electric powered aircraft flying now and a lot of cars on the road. Plus very large numbers of model airplanes, cars etc. While I would not deny that battery fires can occur, and have occurred, the number seem to be remarkably few, especially given that a lot of model flyers push their batteries very hard. Improvements in charging technology most likely has been a factor. Overcharging seems to be a very bad thing to do. I think that the risk of a fire can be managed. I hope that the GFA agrees. On Tue, Sep 2, 2014 at 11:11 AM, Mike Borgelt < mborg...@borgeltinstruments.com> wrote: > Adam, > > It looks to be a motorcycle/race car starting battery. Different duty > cycle from glider batteries. > > The lithium technology is unmentioned. Anything that isn't LiFePO4 > (lithium iron phosphate) probably shouldn't be used in aircraft. Ask > Boeing. The subcontractor for the 787 battery management system managed to > burn down their building during testing. > > Even with LiFePO4 you'll need the right charger and a monitoring system. > > I've got a couple of 4 cell packs of these: > http://www.all-battery.com/Tenergy3.2V15Ah40152SLiFePO4EnergyCellRechargeableBattery-30078.aspx > for 30 A-h at 13 volts for 4KG mass. > > Diode connected MOSFETS to put the packs in parallel (I have some spare > circuit boards to make those. Only 3 components per board). That way if you > lose or have a weak cell in one pack that pack will go offline > automatically. > > Underwriter Labs tested - the test schedule is on the website if you look > around. Quite impressive > > A friend of mine is successfully using a pack of four for starting a half > VW engine in an ultralight. > > Mike > > > > > > > At 10:48 AM 2/09/2014, you wrote: > > Hello All, > > Found these while looking for replacement batteries. Pictured here is a G7 > (7ah), but they have it in G9 too. > > The sales person tells me that the G9 is equivalent to a 6AH regular > glider battery. Weight only 0.9kg! > > What are peoples thoughts that are in the know? > > $399 + a $217 charger. An expensive investment, but would go ahead with it > if I knew it was the goods I was looking for. > > Info here: > http://www.braillebattery.com/index.php/braille/product_batteries/g9 > > > > > > Cheers, > WPP > > Found at shop: www.allstarbatteries.com.au ; Brendale, QLD > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > *Borgelt Instruments* - > *design & manufacture of quality soaring instrumentation since 1978 * > www.borgeltinstruments.com > tel: 07 4635 5784 overseas: int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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