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Author Topic: DECAPERM  (Read 18957 times)

ajb68

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DECAPERM
« on: August 27, 2009, 03:34:05 pm »

DOES ANYBODY KNOW THE RPM OF A 6 VOLT DECAPERM AND IF IT WOULD BE SUITABLE FOR A 33 " FISHING BOAT WITH A 3 " 4 BLADED PROP ? CHEERS GUYS , ANDY
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snowwolflair

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Re: DECAPERM
« Reply #1 on: August 27, 2009, 03:38:13 pm »

No, but it would be suitable. :-))
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rob

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Re: DECAPERM
« Reply #2 on: August 27, 2009, 04:17:28 pm »

Ive got a 6 volt Decaperm in a "danny boy" with a 2" prop and it very nearly planes !
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dreadnought72

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Re: DECAPERM
« Reply #3 on: August 27, 2009, 04:33:32 pm »

I can't answer the revs question, but I've got one of these in the attic - and I've just seen the price of a new one!!!!!  :o

How did that happen?
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Enjoying every minute sailing W9465 Mertensia

ajb68

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Re: DECAPERM
« Reply #4 on: August 27, 2009, 04:47:57 pm »

They aint cheap thats why i wanted to be fairly certain it would be ok for what i need  :-) after i recover from the expense i will start on the build  O0
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Shipmate60

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Re: DECAPERM
« Reply #5 on: August 27, 2009, 05:06:53 pm »

Deccaperms, 6 and 12 volt run about 2750 rpm at the geared outlet shaft.

Bob
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ajb68

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Re: DECAPERM
« Reply #6 on: August 27, 2009, 05:26:58 pm »

cheers bob  :-) should do the job nicely  :}
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Shipmate60

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Re: DECAPERM
« Reply #7 on: August 27, 2009, 05:34:06 pm »

ajb68,

If you don't have  DECCAPERMS the 550 geared motors sold by Model Slipway or a 550 on a 2:1 reduction gearbox will be a better and cheaper solution.

Bob
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ajb68

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Re: DECAPERM
« Reply #8 on: August 27, 2009, 05:39:16 pm »

in what way are they better ? i thought decaperms were top notch motors , but then i dont know much about motors ,  {:-{
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Shipmate60

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Re: DECAPERM
« Reply #9 on: August 27, 2009, 05:47:49 pm »

Deccaperms are large motors geared down to give the torque.
They are electrically very "dirty".
And very expensive.

The geared 550 is relatively cheaper and gives you the option of using 6 or 12 volts, (or any in between), on the same motor so far more flexible.
These motors pull about 1 amp in air and only 2 (aprox) in use so less power hungry.
These give similar torque.
In the event of a burn out just replace a 550 motor, yes Deccaperms do have problems too.

If I buy a boat with Deccaperms in it I usually sell them and replace with Geared 550's.

Some people swear by them, I swear at them!!!

Bob
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Colin Bishop

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Re: DECAPERM
« Reply #10 on: August 27, 2009, 06:06:16 pm »

Bob is right, Decaperms are old fashioned and overpriced. A modern motor will do a better job at a much lower price.

They were the business once - back in the 1970s!

Colin
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ajb68

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Re: DECAPERM
« Reply #11 on: August 27, 2009, 06:28:04 pm »

would a geared 550 run a 3 " 4 blade prop ? {:-{
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Shipmate60

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Re: DECAPERM
« Reply #12 on: August 27, 2009, 06:58:06 pm »

Up to about a 3 inch diameter, My own tug has this set up.

Bob
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Shipmate60

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Re: DECAPERM
« Reply #13 on: August 27, 2009, 06:59:55 pm »

Or if you want a bigger prop go for the 3:1 reduction. Or even to slow the output speed down.

What model are you wanting it for and what size prop?

Bob
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stallspeed

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Re: DECAPERM
« Reply #14 on: August 27, 2009, 07:29:38 pm »

would a geared 550 run a 3 " 4 blade prop ? {:-{
A motor or geared motor can run a prop if the torque load of the propellor is less than half the motor stall torque.
If you have a large prop,don't concern yourself or get confused with any other data or number of poles or high drain/low drain
RS775 STALL TORQUE 431 mNm on 12 v
Torpedo 800 STALL TORQUE 480 mNm on 12 v
Graupner speed 900bb STALL TORQUE 1000 mNm on 12 v
Graupner Speed 720BB Torque STALL TORQUE dunno but large on 12 v

What Bob says about the 550 is true going by the data.
It is more of a 6 volt motor while the data here is at 12 volts.
My pick would be a 775 on 12 volt.
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craftysod

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Re: DECAPERM
« Reply #15 on: August 27, 2009, 07:57:42 pm »

I have a fishing boat 28" long,running on a 2" 4 blade prop on a maplins mfa motor with 2.1 gearbox,
good turn of speed and motor barely gets warm
Hope that helps
Mark
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ajb68

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Re: DECAPERM
« Reply #16 on: August 27, 2009, 08:04:22 pm »

Or if you want a bigger prop go for the 3:1 reduction. Or even to slow the output speed down.

What model are you wanting it for and what size prop?

Bob
Its for a cygnus sf 33 from models by design the prop will be 3 " 4 blade
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stallspeed

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Re: DECAPERM
« Reply #17 on: August 27, 2009, 08:14:09 pm »

Scratch the 775,800 or decaperm idea.
Graupner speed 900bb or air conditioning blower motor out a scrapped car.
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Marks Model Bits

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Re: DECAPERM
« Reply #18 on: August 27, 2009, 08:23:44 pm »

Or one of my 900 motors will power it no problems....... :-)) :-)) :-))
http://www.modelboatmayhem.co.uk/forum/index.php?topic=19292.0

Mark.
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ray123

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Re: DECAPERM
« Reply #19 on: August 27, 2009, 09:17:13 pm »

i run  robbe navys 540 geared 5:1 on  12volt  turning a  4inch prop 6mm shaft  ''no problems'' in my tug   with the cost of decaperms you could but 2 navys & still have change left O0  (you could take the other 'half out for lunch on the change :-)) :D

as it happens i to am building a 33inch  gm33    (can you guess the motor thats in it ;)) a 70mm prop for this one!!!

regards ray
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Tankerman

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Re: DECAPERM
« Reply #20 on: August 30, 2009, 11:37:56 am »


 I am running a 26 year old Decaperm in a model 54" long with a 4 blade, 80mm.propeller. I can sail all day on a 6Volt - 8Ah battery and to judge by the time it takes to recharge the battery after each session the motor cannot be drawing much more than 0.5Amp.
 I have no experience of any other motors but I'm happy with the Decaperm.
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stallspeed

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Re: DECAPERM
« Reply #21 on: August 30, 2009, 12:01:06 pm »

The way to measure current is with an ammeter.
It will debunk your conclusion,Tankerman. %)
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ajb68

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Re: DECAPERM
« Reply #22 on: August 30, 2009, 12:20:49 pm »

Or if you want a bigger prop go for the 3:1 reduction. Or even to slow the output speed down.

What model are you wanting it for and what size prop?

Bob
iTS FOR A MODELS BY DESIGN CYGNUS SF 33 1/12 SCALE , WILL BE USING A 3 " 4 BLADE PROP ,
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stallspeed

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Re: DECAPERM
« Reply #23 on: August 30, 2009, 12:25:14 pm »

Can you picture the prop reaching the rpm on the decaperm box?

Deccaperms, 6 and 12 volt run about 2750 rpm at the geared outlet shaft.

Bob
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Shipmate60

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Re: DECAPERM
« Reply #24 on: August 30, 2009, 12:35:21 pm »

ajb68,
Look at the MMB 900 motor on here in the traders section.
It will be direct drive and on 12 volts will push her along nicely.
The price of a Deccaperm will pay for the motor, coupling and ESC.

http://www.modelboatmayhem.co.uk/forum/index.php?topic=19292.0

Bob
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