Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Navy - Military - Battleships: => Topic started by: Martin (Admin) on April 03, 2007, 02:57:56 pm
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Via email to Mayhem....
Hi there Martin,
I hope you can help, I am presently building a 9 foot 1:144 scale USS Enterprise aircraft carrier, and I need 4 motors to power it, 2 motors each running off Electronize FR15 speed controllers and a 12volt battery, what do you suggest, its my first attempt at model building. I have 4 x 540 in at present and it is VERY slow and takes a long while to start moving and the motors get VERY hot.
What about golf trolley motors BUT they spin at 150rpm is that too slow?
Thanks,
Melville
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Hi there,
I would suggest getting some car fan motors
I have seen a 1/96th scale Nimitz ran on these
and it performed well. If you look in the link below
some people are discussing the best motors to use
http://www.modelboatmayhem.co.uk/forum/index.php?topic=3460.0
hope this helps
Colin
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What size props you running on her?
Bob
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Melville,
I'm working on a CV-6 USS Enterprise of about the same size. I just ordered 4 of the motors found in the following link:
http://www.allelectronics.com/cgi-bin/item/DCM-266/400200/DC_MOTOR,_3-24_VDC_.html
They seem to be Graupner Speed 700 in size and performance. Seem a good deal at $3.50 each, that's a bit less than 2# each (I don't know how to make the UK Pounds sign on my computer).
A couple of reviewers used them to replace the motors in the children's toy "Power Wheels". That's the "Barbie Jeep" sized toy that children ride in.
Hope this helps.
Mike
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9 feet at 1/144th scale?, its closer to seven and a bit surely, I used 4 Buhlers in mine when I did scratch building in the old days on 6 Volts, the medium Buhlers and before anyone starts, YES, I have probably splet boolers wrong!
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Paul,
Where do you get Buhlers from now?
Bob
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Melville-- What does your great beast of a model weigh? I'm wondering how much ballast I need to scrounge up.
Mike
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Paul,
Where do you get Buhlers from now?
Bob
How about here Bob.
http://www.buehlermotor.com/cgi-bin/sr.exe/standardmotorstartus
Richard ;)
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No prices Richard.
Scoonies used to sell them reasonably priced.
Bob
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I can source them now, but, they used to be 25 quid, now they are comming in at about 50 "OUCH"
Worth it though.
Paul...
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Model motors direct do Buhlers
Ian
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But what size props is she running?
Bob
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The four motors arrived yesterday. I'll try to make time to test them this weekend and post the results. I have a handfull of props from 45mm to 60mm. I'll run the test at 12v direct drive.
Mike
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As always, a possible alternative solution.
Go with the car fan motors (or similar), but only drive 2 props and let the other 2 freewheel. You won't see any difference in performance and slow speed handling could be better. BY
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For those size props a 2:1 or 3:1 gearbox on a 550 motor will drive her well and with the 550 motors you have the option of using 6 or 12 volts.
Bob
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A quick note to follow up on the motors I ordered: They arrived a few weeks back and I wasn't happy with the low speed performance of the motors with any of the esc's that I have. I've found that the Astro Flight 208D Marine esc is a very, very nice unit. I was lucky enough to find a brand new pair on ebay for a very nice price. I haven't tested them with the Astro Wattmeter under load yet but the lowest speed on the Astro's is very slow tick-over of the prop. One of my favorite things to do is to have the throttle set for just a few clicks of power and see if I can maintain control with the prop just ticking over. When I get couplings and prop shafts sorted I'll test and post the results.
Mike