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Author Topic: buggy pack in series  (Read 858 times)

Ted_H

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buggy pack in series
« on: July 19, 2013, 09:54:45 PM »

ive just test sailed my frigate powered by a 7.6v buggy pack through a elecrtronize 43x speed contrler with a BEC , however the speed seem somewhat slow.. would ther be any detrement to wiring in another buggy pack in series , efctively pringing the voltge up to 14+ volts ..
Unfortunately i cant give details of the motor nor remove it and im not in a position to change the prop either.
Thanks
Ted :police: 
 
 
 
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Stavros

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Re: buggy pack in series
« Reply #1 on: July 19, 2013, 10:21:28 PM »

Cant see a problem as long as your speed controller can take the voltage ,let alone the motor


Dave
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Shipmate60

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Re: buggy pack in series
« Reply #2 on: July 19, 2013, 10:30:09 PM »

What size is she?
What size props?
And
What motors are you using.


Bob
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Ted_H

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Re: buggy pack in series
« Reply #3 on: July 19, 2013, 10:42:06 PM »

shes around 4ft , a frigate so long and slender, prop is around 35mm. motor unknown but direct drive ( no gearbox)
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Martin [Admin]

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Re: buggy pack in series
« Reply #4 on: July 20, 2013, 01:40:11 AM »


 Does the motor sound like it's labouring or is it screaming?
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Ted_H

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Re: buggy pack in series
« Reply #5 on: July 20, 2013, 07:23:02 AM »

neither .. just running slow .. as if underpowered
 
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john44

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Re: buggy pack in series
« Reply #6 on: July 20, 2013, 09:37:50 AM »

Cant see a problem as long as your speed controller can take the voltage ,let alone the motor


Dave
Electronise are usually o/k up to 24v, but check motor max voltage.

john
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Martin [Admin]

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Re: buggy pack in series
« Reply #7 on: July 20, 2013, 09:45:07 AM »

 
no stiffness in the drive chain?
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Ted_H

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Re: buggy pack in series
« Reply #8 on: July 20, 2013, 09:50:31 AM »

no its all free turning .. I think ive fit the wrong motor all those years ago, I dont think is  a 6v one as its too slow on 7.2v
 
 
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malcolmfrary

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Re: buggy pack in series
« Reply #9 on: July 20, 2013, 09:52:44 AM »

What size is the motor can?  This gives a starting point for guesswork.  Can you measure what current is being taken?
If its a 12 volt motor, it will be a bit calm on 7.2 volts.  I say 12 volts because that is a very common value, what with almost every car in the world having 12 volt electrics and each being loaded with small electric motors.
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Ted_H

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Re: buggy pack in series
« Reply #10 on: July 20, 2013, 10:06:19 AM »

unfortunately i cant measure the current  i don't have the boat to hand as i type this.... but all i can say its a common sized can for a boat of its size ,certainly not a fan motor size... sorry i cant add any more info. :(( 
edit .... following a call home the motor is around a 40mm dia
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malcolmfrary

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Re: buggy pack in series
« Reply #11 on: July 20, 2013, 05:21:54 PM »

A 540 is 54mm long, dia 36mm.  If running anemically on 7.2 volts (540s and 6 cells being sort of standard for buggys a while back) either its likely to be a 12 volt one, or it could be a dud.  One trick to help figure something about it is to rotate the prop by hand - you should be able to feel "compressions" as the armature poles pass the magnet poles.  Count them for a full rotation, divide by 2, you have the number of poles.
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