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Motor with reverse

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Old 04-03-2012, 01:16 PM
  #1
nitro bry
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Default Motor with reverse

Hi All
I have the Tug Amsterdam 40" and dont know what motor size to fit.
I just want something standard but i would like a reverse motor.

Any suggestions on motor and speed controller.
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Old 04-03-2012, 02:45 PM
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Default RE: Motor with reverse

Bry,

Reverse is normally handled by the ESC you use so make sure you buy one tht has reverse capabilities.  Most, not all, marine ESC have reverse.

Bob
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Old 04-03-2012, 02:51 PM
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Default RE: Motor with reverse

Bry,

Motor size is another bag of worms. Direct drive calls for a high torque lower RPM motor; The higher RPM motor require either a belt drive, gear reduction or a mechanical gear reduction of 2:1, 2.5:1 or even 3:1, all depending on the motor you are using.

Now that I have you properly confused, or afraid (you choose), I'm going to et some of the other, more informed guru's tell you how to achieve the better power train.

Personally, I would use a large, high torque, lower RPM motor.

Let's see what the great ones have to say.

Bob
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Old 04-04-2012, 01:45 AM
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Default RE: Motor with reverse

A visit to a car scrapyard might be in order.  Or search the web for parts.  I would be looking for a window winder motor from something big.  Ideally something with a larger case diameter than the prop, and more poles than the prop has blades.  Then find out what current it pulls under load from the battery you intend to use (with a boat that size, look for 12 volt SLA batteries to power the 12 volt motor) to help pick an ESC.
Or give Westbourne Models a ring.  They have a reputation for being helpful.
A quick google for "tug amsterdam rc model" should find links with enough clues.
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Old 04-04-2012, 09:58 AM
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Default RE: Motor with reverse

Thanks for the responses

Like the sound of a window motor.

had a search on ebay and found a few like these.

Motor
http://www.ebay.co.uk/itm/2808459636...84.m1423.l2649

12 volt SLA batterie
http://www.ebay.co.uk/itm/12V-1-2AH-...item2eb51f26bb

If i was to use the window motor with the 12 volt SLA batterie, what speed controller would i need.

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Old 04-04-2012, 01:58 PM
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Default RE: Motor with reverse

Bry,

I would look for a 12V 7Ah battery.  Better to have too much then not enough. More Ah just means longer run times.

Bob
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Old 04-05-2012, 01:39 AM
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Default RE: Motor with reverse


Quote:
ORIGINAL: rblubaugh

Bry,

I would look for a 12V 7Ah battery. Better to have too much then not enough. More Ah just means longer run times.

Bob
Agreed - in a hull this size, the increase in weight should be no problem since it will probably still need plenty of ballast to bring it down to a stable watyerline. I was watching one of those auction king type programs a few days ago where they got, and played with, a model tug. Looked very wobbly sailing as it was floating on rather than in the water.

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Old 04-05-2012, 08:51 AM
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Default RE: Motor with reverse

Now i'm confused

I have done a search on ebay and found the below, If i was to buy one of those Which one would be best for my boat.

Voltage: 12V DC
RPM: 500RPM
Diameter: 37mm
Shaft length: 21mm
Length (excl. shaft): 59mm
Shaft diameter: 6mm
Weight: 192g
http://www.ebay.co.uk/itm/37mm-12V-D...item2561013830


12V DC
4RPM
Diameter: 37mm
Length (excluding shaft): 77mm
Shaft length: 21mm
Total length: 98mm
Shaft diameter: 5.5mm
Weight: 245g
http://www.ebay.co.uk/itm/12V-DC-500...item2c629fcaaf
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Old 04-05-2012, 09:11 AM
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Default RE: Motor with reverse

Bry,

Neither one
would work, the RPM's are far too low. You want something in the neighborhood of 10,000 RPM. Look for something like this the High Torque Panasonic 12V, 14.4V or 18V DC motor such as available here:
http://www.ebay.com/itm/360406973045...84.m1438.l2649

This motor has High Torque, moderate RPM and best of all a low current drain. I think you could run this motor direct drive with little problem on a 12V battery like the one I suggested or one with a higher Ah rating.

Bob

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Old 04-05-2012, 11:01 AM
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Default RE: Motor with reverse

Thanks
I'll do a search
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Old 04-05-2012, 11:48 AM
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Default RE: Motor with reverse

You could also look here

Browse around his site, a good guy to talk to if rung during business hours.  He can also point you at a GOOD ESC.  Mtronics are good, too.  Both are UK manufacturers and you get UK consumer protection.

Also, a 12 volt 545 would be adequate, quite cheap, a 15 amp ESC will do the job.
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Old 04-05-2012, 11:58 AM
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Default RE: Motor with reverse

Mfr02,

How large a prop can you run with the 545 motor? 35 - 40mm diameter? I really don't know. What about pitch?

Bob
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Old 04-05-2012, 12:00 PM
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Default RE: Motor with reverse

You might go to a 600 or MAYBE 700 size can.
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Old 04-05-2012, 12:17 PM
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Default RE: Motor with reverse

I'm thinking of the cheaper option.

Now im looking at this http://www.ebay.co.uk/itm/Graupner-S...item5d2f018dd2

This one http://www.ebay.co.uk/itm/Graupner-7...item3cc495ea11

This one http://www.ebay.co.uk/itm/13000RPM-O...item5d32ac8e7a

What size ESC with that motor and as rblubaugh mentioned what size prop with that 600 motor.
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Old 04-06-2012, 01:40 AM
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Default RE: Motor with reverse

40mm sounds about right.  The larger motors should be OK with 45mm.  You dont usually get much choice on pitch with scale props, I've always been happy with what came out of the shop.
For any particular boat, I would try to google for images and see what others have done.  A 540/600 size should be fine for cruising the boat.  If you want to do serious towing, use the bigger motor.  A mate of mine likes tugs and did competitive towing.  He would habitually, in a tug of that size, put a pair of 700 size motors in if it was a twin prop boat.
To figure the ESC, take the claimed normal running under load figure, multiply by two, get an ESC that will handle at least that.  Remember that Hong Kong Amps are much smaller, and the placing of the decimal point in the claimed rating tends to be a bit casual.  Fuse the positive lead between battery and ESC between the anticipated motor demand and the max rating of the ESC.
Like I said before, a google for "artesania latina amsterdam" will find you lots of links, including build logs by people who have built this particular model.   With a build this size, I don't think that there are going to be many cheap options that will work.   Consensus of the links I have looked at point to it weighing in at about 35lb.
Since it is a scale model, once you have googled for the information, you should know the horse power of the original.  Scale this down add 50% for model inefficiencies, and you will have a wattage figure for your motor so you will have an idea about the needed current draw at the voltage you intend to use.
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Old 04-07-2012, 01:16 AM
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Default RE: Motor with reverse

Hi All
A friend has sold me a Graupner Speed 700 Turbo C 9.6V http://www.cornwallmodelboats.co.uk/...pner_7307.html for £5 new, I,m still confused on which ESC to use with it.
I have also purchased a 12v 7Ah Ultramax Lead Acid Battery.

My speps are
Graupner Speed 700 Turbo C 9.6V
12v 7Ah Ultramax Lead Acid Battery
What ESC to use with them
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Old 04-07-2012, 02:22 AM
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Default RE: Motor with reverse

motor 9.6 volt.  Battery 12 volt.  You have just bought an overheating problem.
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Old 04-07-2012, 07:58 AM
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Default RE: Motor with reverse

The motor is rated Operating voltage range 7,2 ... 14,4 V

So my 12v 7Ah Ultramax Lead Acid Battery will be no good then.

But if I fitted my 2 x 7.2v battery packs which is 14.4v is ok but not a 12v battery, now I am totally confused.
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Old 04-07-2012, 09:56 AM
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Default RE: Motor with reverse

12v is still within its 7.2-14.4v rated range
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Old 04-07-2012, 01:02 PM
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Default RE: Motor with reverse

Thanks for all the help.

What esc would i need, I have done a lot of searching and think i need a 25 to 30 amp is this correct.
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Old 04-07-2012, 04:25 PM
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Default RE: Motor with reverse

Have a look at this page:

http://www.action-electronics.co.uk/speed.php

Scroll down to the bottom one, their P98, I believe this will work for you.

Near the top of the page along the left, click on the "Contact Us" button. Either call them and talk to Dave or click on his email link, and ask Dave about the P98 and he will get you sorted on that.

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Old 04-08-2012, 03:42 AM
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Default RE: Motor with reverse

I'll take a look Thanks
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