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Hacker Brushless with LiPo Battery

Hacker Brushless with LiPo Battery

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Old 10-13-2004, 02:12 AM
  #16  
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Try getting this. It charges just 'bout anything...Nicd, NiMh, LiPo, Lion.....

Bryan

Last edited by tornado; 10-13-2004 at 02:22 AM.
 
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Old 10-13-2004, 02:31 AM
  #17  
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Most Li-Po can give out sustained amperage of at least five times capacity, meaning 2000 mAh cells can give 10 amps and a bit more for very short time. Should you need more power just buy battery with more capacity, 8000 mAh pack should give you at least 40 amps.
If you handle Li-Po packs with care: Do not short circuit. Do not use regular charger. Do not overheat them. Then it's very unlikely that they'll explode.
The Triton charger from Great Planes (Towerhobbies) can charge any cells, including Li-Po.
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Old 10-13-2004, 03:38 AM
  #18  
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Default Higher volts equals higher speeds

Originally posted by ziggy12345
Yo! Thanks guys. Thats what I was thinking. Higher volts less amps for the same speed. so for same amps higher speed!!

Problem now is the ESC. I have been told a Schulze ESC is the only one capable of handling the power. Bit pricy, any alternatives out there?

I will also need a LiPo charger as ordinary chargers dont work with LiPo correct?

Cheers
Yes, 11.1volts is the way to go for high speed. Not sure which ESC's can handle that. In micro, the Mamba ESC easily handles it but a Mamba 25 ESC would not last long powering a larger motor.

If you are going for speed, and not racing control, you might look into a plane ESC. They have been around longer and are cheaper. For example, this Kontronik controller is only $45 and can handle 12 cells. Not sure if the 45amps it can handle would be enough, though.

Also, I second the Triton recommendation.

Kontronik at Tower

Last edited by Disaster; 10-13-2004 at 03:54 AM.
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Old 10-13-2004, 05:53 AM
  #19  
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You need around 75A to get a stock motor off the mark. While running it would draw say 30A
Where did you get this info from???? Not even close.....
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Old 10-13-2004, 07:28 AM
  #20  
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One problem I see with the LiPo cells is that if you drop the voltage below 3v they are fooked!! You can get a warning light for them that flashes at 4v
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Old 10-13-2004, 07:36 AM
  #21  
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Default Mamba 25 speed control has Li/Ion protection.

Originally posted by ziggy12345
One problem I see with the LiPo cells is that if you drop the voltage below 3v they are fooked!! You can get a warning light for them that flashes at 4v
I suspect some others do as well. You can set the shutoff voltage of the Mamba 25....think it defaults to around 4 volts.
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Old 10-13-2004, 02:36 PM
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Default AMPs draw??

Originally posted by vtl1180ny
Where did you get this info from???? Not even close.....
Read it in a magazine... What do you think is more accurate?
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Old 10-13-2004, 03:30 PM
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The peak current draw while getting a sensorless motor off the line will be quite high, could easily hit 200% of running current. I always overrate my controller for a given motor. I run a Schulze U-Force 75 (75A cont., 100 Peak) on a lehner basic 4200 motor (45A cont., 60ish peak). Keeping the peak current of the motor at or below the continuous rating of the controller seeems to give good results.
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Old 10-13-2004, 03:33 PM
  #24  
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Originally posted by kufman
The peak current draw while getting a sensorless motor off the line will be quite high, could easily hit 200% of running current. I always overrate my controller for a given motor. I run a Schulze U-Force 75 (75A cont., 100 Peak) on a lehner basic 4200 motor (45A cont., 60ish peak). Keeping the peak current of the motor at or below the continuous rating of the controller seeems to give good results.
Are you using LiPo cells?

Cheers
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