View Full Version : What size batteries?
Just tried to get my cub in the air - it fly's like a brick!!
I think the batteries I used might be just too heavy - I had them lying around so thought I'd give them a go, but now I think I should buy something more suitable, so what do you reckon?
It's a 48 inch balsa built cub with a direct drive 6v speed 400. Not bothered about flight times, as long as they are more than 5 minutes, as long as it does not continue to act like concrete with momentum!
tried a 8 cell AA 1300mah Nimh size pack - not dissimilar to a TX pack but with higher discharge /ubbthreads/images/graemlins/tongue.gif weighs in a t 213 g's - quite heavy when the whole craft with pack weighs 600 g's..... :o
Bit daft, I know, but you know what it's like, sometimes enthusiasm out-weighs sensibility!!
I'm not exactly sure what out there for this sort of size plane. But people I know fly a lot of them - they use 800 mah or 1100 mah 8-10 cell packs, I think the cells are 500ar size - I Don't know what the weight is like, they might weigh the same/more.
Is the motor geared or direct drive? & what prop - might be useful to know the required current draw.
Just had a look at some battery pack's - there are some AR sizes that weigh about 120g's - suppose that is a considerable weight saving!
At the moment it has a 6v speed 400, direct drive with a 6x4 prop.
If I could ony find the bloomin instructions I could see what they recommended!!
What make is the plane? I just found about 20 different cub models.
It's the Wattage balsa built one -I've found a couple of places that say 800mah batteries should be used, but not in what cell size/numbers - obviously could make a huge difference to the weight!
I found this:
[ QUOTE ]
Specifications: Wing span (46.5”) - Length 28”) - Wing area 330 sq.in. - Weight (22.4oz) - Motor included 400 type direct drive - Radio required 3 channel with micro servos - Electronic speed controller and 7.8 cell 500-800 mAh battery also required
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That should give you plenty of info/different setups - hope it gets you sorted :D
Cheers for your help soundman - Good bit of investigative skills!!
dongle, I would go with the 500ARs all the speed 400- models I have ever used have always used these cells. If you want high discharge NiMh that are the same size/weight you could try the KAN950's they will give you twice the flight time of the 500ARs'. www.onlycells.com (http://www.onlycells.com) or is it co.uk?????
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