Re: Electric for large Planes

Glenn Jacobs wrote:
> On Fri, 23 May 2008 08:45:38 +0100, The Natural Philosopher wrote:
> 
>> Its surely possible.
>>
>> Is this a prop hanging Pitts or Ultimate, or a WWI scale plane tho?
> 
> A WW2 Trainer

Well shoot for about 60 efficient brushless watts per lb AUW then and 
you will have a sensible flight envelope.I've gor a tiger moth that is 
well overpowered on that figure..but it is smaller and flies slower. If 
you sort of think in terms of around a KW capable components..so 
something like a 6s pack at 20V running at around 50A peak..50A speed 
controller and at that sort of level a switching BEC or sperate 
receiver/servo pack..

So you are probably looking at a 6s or 2 3s 5000mAh packs or so, a 50A 
SC and a motor that can handle the best part of a kilowatt..theres a lot 
more now than there used to be. www.maxamps.com or 
www.cheapbatterypacks.com sell no nonsense stuff that will do 10C 
delivery reliably, and I wouldn't attempt to squeeze more out. Besides 
being conservative means you can throttle back and get 40 minute flights..

I've been testing out some of the smaller Turngy's from United hobbies, 
they go well

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=2101&Product_Name=TR_50-65B_350kv_Brushless_Outrunner_(Eq:_4030_AXi)

looks suitable, but I dunno on the bigger sizes..or you can play safe 
and get an AXI - 4130 series is probably about the right size..

Looks like an AXI 4130/12 on 6s and 18x12 is not far of the sort of 
power you need.

http://www.modelmotors.cz/index.php?page=61&product=4130&serie=20&line=GOLD