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speed controler

Old 11-20-2009, 06:54 AM
  #1  
nino007
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Default speed controler

Hi , i have built speedboat it is 76 cm long , and i wont to put 2 brushed motors inside, so so i need 2 speed controlers or just 1?
thx
Old 11-20-2009, 07:39 AM
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brodjack
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Default RE: speed controler

One should be fine,wire the motor leads in parallel.
Just make sure its a big amp speedcontroller that can handle the drain of both motors together.
Brod..
Old 11-20-2009, 08:24 AM
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nino007
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Default RE: speed controler

which one is better
http://www.cornwallmodelboats.co.uk/...pner-7191.html
or
http://www.cornwallmodelboats.co.uk/...pner_2880.html
Old 11-20-2009, 10:21 AM
  #4  
mfr02
 
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Default RE: speed controler

A lot depends on the type of motors you intend to use, and the voltage of the battery that you intend to run it on. Once you know the likely current draw (and this will also be affected by the props fitted) you can figure the ESCs that will do the job for you.
Old 11-20-2009, 11:10 AM
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nino007
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Default RE: speed controler

The batery is 9.6v 3000 mAh and i have 2 not so powerfull motors 550
Old 11-20-2009, 11:57 AM
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brodjack
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Default RE: speed controler

The first esc you listed is only designed for 6-7 cells,yours is an eight cell pack.
The second one listed isnt enough amp rated for 2 motors hooked together.
This is a 90 amp one which will work with the 2 motors.
ESC Car SPC 90 Amp brushed..
http://www.overlanderbatteries.co.uk...mart&Itemid=70

Brod.
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Old 11-20-2009, 12:51 PM
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nino007
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Default RE: speed controler

How about i buy the first i listed and 8.4v battery 3600 mAh with 7 cells ?
Old 11-20-2009, 02:38 PM
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brodjack
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Default RE: speed controler

At only 23amps continuous it possibly wont be able to handle the 2 motors at full throttle in a boat,it is more for a car where it wont be running flat out most of the time.
You could buy two and wire each motor to each esc,but would be more money.The 90 amp one would be a much safer bet,motors wired together.
Which boat is it? submerged prop,surface drive?
Brod..
Old 11-20-2009, 02:45 PM
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nino007
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Default RE: speed controler

its submerged prop
Old 12-11-2009, 04:16 PM
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Ghost in the shell
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Default RE: speed controler

if you have two esc's you can control each motor independently by either a 4ch radio or if you have a 2ch radio, use a V-tail mixer as used by the aircraft guys.
Old 12-12-2009, 07:33 AM
  #11  
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Default RE: speed controler

It's quite possible that two ESCs, each good for one motor, might be cheaper than one big knobbly one.
Old 12-12-2009, 08:24 AM
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pompebled
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Default RE: speed controler

ORIGINAL: mfr02
It's quite possible that two ESCs, each good for one motor, might be cheaper than one big knobbly one.
Two of these will do the job, provided you don't overprop the motors:
http://www.cornwallmodelboats.co.uk/...pner_2880.html

Make sure to pull the red lead on one of the ESC's, to avoid double BEC trouble.

Regards, Jan.
Old 12-12-2009, 11:01 AM
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Ghost in the shell
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Default RE: speed controler

twin esc options
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Old 12-13-2009, 12:39 PM
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Default RE: speed controler

Or get 2 of these....if you want to go on a budget.
They dont have reverse though. :-)

http://www.hobbycity.com/hobbycity/s...0A_BRUSHED_ESC
Old 12-13-2009, 03:50 PM
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Default RE: speed controler

I'm curious about the vtail thing
Old 12-14-2009, 01:35 PM
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nino007
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Default RE: speed controler

1 more silly questiion . if i put 1 motor inside whic side do i put ruder?
Old 12-14-2009, 07:06 PM
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Default RE: speed controler

on a subsurface drive, it's best to go right behind the prop(s)

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