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Multi Motor help

Old 01-15-2012, 05:52 PM
  #1  
hiflyerk
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Default Multi Motor help

I have this foam B29 that was given to me, it has 4 motors that currently use differental power to control the plane. I want to modify the equipment, add a new esc's. What is best way to determine the esc capicity needed. Should I go with 1 esc or 2?
What type of battey power? Should I change to motors out to brushless?
Span is aprox 42" overall weight is 11oz
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Last edited by hiflyerk; 01-16-2012 at 03:32 PM.
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Old 01-16-2012, 01:58 PM
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Walt Thyng
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Why do you need a new esc in order to go to 2.4? As long as the rx plug fits, frequency shouldn't make any difference.
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Old 01-16-2012, 06:10 PM
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cliffh
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I didn't see anything about changing to 2.4

Anyhow, with BRUSHED motors, you only need one esc. With BRUSHLESS you need a separate esc for each motor. Disclaimer: some people can sometimes get away with a single esc for 2 brushless motors, but it is not recommended and usually will not work correctly.

The best way to determine the correct size esc is to use a wattmeter and briefly power the motors up to determine the power draw. Actually though, those are small motors and I'm sure a single brushed 10 amp esc will be fine.

Wire the motors in parallel, not series.

Cliff
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Old 01-16-2012, 06:50 PM
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hiflyerk
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Any suggestion as to size of ESC needed.
4 motors
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Old 01-16-2012, 07:32 PM
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cliffh
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I'm sure a 10amp esc would work fine for those small motors in the photo....all 4 of them. A larger esc could also be used with just a penalty in weight.

But that is just an educated quess. My GWS 4 motor C130 draws 8 amps with a 2S lipo. My 2 motor GWS BN2 Islander with much larger motors draws 10 amps with a 2S lipo.

Your motors look very small. To be safe, you should beg or borrow a Wattmeter to check the current draw or just purchase a 25 amp esc to be absolutely safe.

At any rate, with brushed motors, one esc is fine.

Cliff
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Old 01-16-2012, 09:45 PM
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cliffh
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Here is a 20 amp brushed esc for less than $5 .... unfortunatly they are backordered right now. Are you in a hurry?

http://www.hobbyking.com/hobbyking/s...idProduct=9090
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Old 01-17-2012, 03:20 PM
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I'm going to guess that this is the airplane you have. Here is a link to lots of information and tips for you.

http://www.rcgroups.com/forums/showthread.php?t=284067

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