Decaperm 12v Motor

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Decaperm 12v Motor

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24 May 2008 at 23:47 #13862
SCOOW2
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@scoow2
In the last few months I’ve restored my old plywood built Perkasa model which I built about 26 years ago whilst a young spotty teenager. I bought new gel cell batteries and replaced the old mechanical speed controller with an ESC. I retained the original motor which is a Decaperm 12V motor, and after years of sitting in my Dad’s loft gathering dust, it ran perfectly. It has been running really well until the other day when it just stopped. The batteries are fine, the ESC appears to be ok but the motor just doesn’t run when power is added to it. It doesn’t appear to have burnt out and it hasn’t seized. Have I had it? Do I need to replace it, or is there anything I can do to revive it? I know to replace it like for like is going to be very expensive, so if I have to go down this route has anyone got any motor recommendations that won’t break the bank? Many thanks.

Dave
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25 May 2008 at 09:29 #13864
ashley needham
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@ashleyneedham69188
Scoo. I will pre-empt the next forum post on this subject by saying that the size of the beast will need to be known for the correct advice to be given! I have not built one of these craft, but it seems to me one of the Torpedo 800 or 850 motor is a popular choice? I have always thought they were overpriced and offered no appreciable advantage over other types…HOWEVER they have been available for a long time, and so this must say something..it may be that they are a quality motor, the likes of which wasnt around 20 years ago, but nowadays??? Ashley.
25 May 2008 at 09:30 #13865
ashley needham
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@ashleyneedham69188
Whoops.. decaperms overpriced, thats meant to read!
25 May 2008 at 21:27 #13887
SCOOW2
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@scoow2
Ashley,

Thanks for your help, that’s great. The boat itself is about 40" LOA and if I remember rightly, it was a Precedent (or President) Kit. One other thing, I’ve looked at the Torpedo 850 motor as you suggested and was wondering if:

a. Does it need water cooling? and

b. Do I need to add capacitors?

Thanks again,

Dave (SCOOW2)
25 May 2008 at 23:47 #13888
60watt
Participant
@60watt
– or is there anything I can do to revive it?-

First things I would do is continuity test while rotating the full 360….Then,regardless of the result,couple the ungeared shaft to a working motor and run it for a minute in the opposite direction it would normally run.There is a very slight chance it will work ,a while and at least, and prove the armature is ok.You could also hook it up to a bulb while doing this.

If you can dismantle the motor you could do a continuity check directly on the armature and be able to see if the brushes are worn or simply not making contact.
26 May 2008 at 08:58 #13890
Manxman
Participant
@manxman
Hi Dave,

Regards the Torpedo 850 motors, I’ve just bought 2 x 800 Torpedo’s for my Imara tug boat and they are suppressed INSIDE.

the 800s are lower revving versions of the 850. and do not require water cooling, however the faster 850 may do

Cheers – Ken
26 May 2008 at 09:39 #13893
ashley needham
Participant
@ashleyneedham69188
Dave. I would be tempted just to fit an 850 and have done with it. It seems to be the motor of choice for your model nowadays . You can get water cooling coils for the 850, so from the point of view that you dont want to be fiddling after fitting, it may make sense to fit water cooling anyway, the cost is minimal. If at the end of the day you dont need it,then fine, but if you do, its all ready in place. Ashley
26 May 2008 at 10:31 #13894
neil hp
Participant
@neilhp
I ran a 42" fast pilot boat(12"beam ) with 4 blade 50mm brass props on 2 x 850’s not so long ago on 12 volt and although the motors got "warm" I didn’t feel the need for cooling coils, but each to his /her choice I suppose.
28 July 2008 at 01:11 #14905
Bjorn Ivar Jakobsen
Participant
@bjornivarjakobsen24104
Hi.

i have buildt a model scale boat.

about 42" long… have ordered a torpedo 850 for this, but i don’t know what ESC to use….
Can somebody please help me here.

Also what prop is recomended to use.
28 July 2008 at 08:21 #14906
neil hp
Participant
@neilhp
I used Electronize 30 amp ESC’s with inline 20amp fuses.worked a treat on 850 torpedoes.
28 July 2008 at 14:32 #14920
Bjorn Ivar Jakobsen
Participant
@bjornivarjakobsen24104
Thanks

but what type of ESC can i use on a 12v lead battery.
(i’m new in model boat )
28 July 2008 at 16:05 #14924
neil hp
Participant
@neilhp
you can use those that I have quoted above, made by a company called ELECTRONIZE.they make a full range of ESC to suit 6 and 12 volt and the one with a 30 amp rating will take 12 volts.hope this helps.neil.
28 July 2008 at 17:27 #14926
Bjorn Ivar Jakobsen
Participant
@bjornivarjakobsen24104
Thanks for that.

I have asked many people before, but no answer on this.
So this forum and you is the first to answer
28 July 2008 at 18:38 #14929
neil hp
Participant
@neilhp
no problems bjorn. we’re here to help.neil.
9 January 2009 at 19:20 #4958
SCOOW2
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@scoow2
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