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  1. #1
    nitro bry's Avatar
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    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.
    Bry

  2. #2

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    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

  3. #3

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    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

  4. #4

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    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.

  5. #5
    nitro bry's Avatar
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    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.

    Bry

  6. #6

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    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

  7. #7

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    RE: Motor with reverse


    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.


  8. #8
    nitro bry's Avatar
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    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
    Bry

  9. #9

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    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


  10. #10
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    RE: Motor with reverse

    Thanks
    I'll do a search
    Bry

  11. #11

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    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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    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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    RE: Motor with reverse

    You might go to a 600 or MAYBE 700 size can.

  14. #14
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    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.
    Bry

  15. #15

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    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.

  16. #16
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    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
    Bry

  17. #17

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    RE: Motor with reverse

    motor 9.6 volt.  Battery 12 volt.  You have just bought an overheating problem.

  18. #18
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    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.
    Bry

  19. #19

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    RE: Motor with reverse

    12v is still within its 7.2-14.4v rated range

  20. #20
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    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.
    Bry

  21. #21
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    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.

    John KaBang

  22. #22
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    RE: Motor with reverse

    I'll take a look Thanks
    Bry


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