|02-03-2013, 11:28 PM||#1|
RCC Junior Contributor
I am: wilf h
Join Date: Dec 2012
Location: saskatoon saskatchewan
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okay to power a lt-40 size plane. Could a guy use cordless tool type batterys nicads or lithium.
I realize they may ne heaver than r/c batteries but I have a ton of the already in different voltages and amp hrs.
the other thing with NiCad is I can run them empty and not worry about harming them.
|02-04-2013, 03:53 AM||#2|
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I am: David C
Join Date: Jul 2010
Location: Morewood, ON
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MC-20 MX-20 X9D+ X12S
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Sure you can.
You will not get any where near the run time that you can get with a LiPo of the same weight. power to weight ratio of a LiPo is like four times or better. You also will not be able to draw any where near the same amount of current from a NiCad of the same weight. You would have to make a battery pack weighing like four times as much to get the same current capability out of a NiCad.
With the Low Voltage Cut-Off feature of a speed controller there should be no issue with draining a LiPo down too much. Use a speed controller that has adjustable LVC and set it at 3.2 volts per cell or higher and you should never harm your batteries.
The NiCad reqd to power a 40 size airplane with decent power and run time will be absolutely huge.
MC-20 MX-20 Taranis X9DPlus HORUS
Friends don't let friends fly Spektrum!
Electric flying is pretty much seeing how close to a dead short you can run without setting it on fire.
|02-04-2013, 12:39 PM||#3|
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I am: Gord C
Join Date: Sep 2002
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I Have some of the li-ion power tool cells that work not bad. They don't have quite the power of the lipos so it takes 4 cells of li-ion to equal the power of the lipos. A little heavier but work very well Some are the Canadian made Emoli cells made out in BC.
Tried for my kamikazi pilots licence. Flunked the test.
|02-04-2013, 12:43 PM||#4|
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I am: David
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Most nicd drill batteries are 1300mah - 1700mah and can output maybe 5-10 amps. The quality is low and not like the cadnica cells used for rc cars years back.
The li-ion cells you get from the drill packs (non dewalt 30V LiFe) are good for 10-25 amps depending on who make them. Capasity ranges from about 1000mah - 1500mah.
I have a bunch myself but the power to weight is low. When I ran rc cars I use the cells out of a 3.0ah makita pack where weight wasn't an issue and they ran fine setup as a 2S4P.
If you're planning on way-overpowering your plane and "flying like a maniac", you might consider gluing the tail feathers down to avoid flutter.
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