Adam
using a 100' 4000 hp, 55 tonne bollard pull tug as a start point
a 14' model will have
beam 4.5ft
displacement 2250lbs
scale speed 4.8knots - this is very near hull speed so even a lot more power wont get you much faster
2 of 4 blade props 12*4.3" pitch (in schottel ducts) or one 4 blader of 22" x 4.3" - in the end one 12 incher will probably get you moving
turning at 2050 rpm
will require 2 motors of 2hp each and 34ft/bs torque each
One will proabbly give you 4.8 knots and let you tow 14 dighy full of spectators
Refer to the google god for the details of the items you mention
The Advanced DC Motor #A00-4009 replaces the #A89-4001 they are are 36 volt motor 63 rpm/v, rated for 80 amps continuous & 300 peaks and 6hp-28hp, 6.7" diameter about 10" long, weighing 46lbs (for scale it has too much hp and not enought torque if thats important) A lower rpm/v figure at a higher voltage will give you the same rpm, draw fewer amps and make more torque per amp.
The controller is a metal box as big as a few housebricks full of electronics which will cope with the power the motor might draw (it has some redundancy) and some safety sensors as well.
For your model to work and move, tow a 20 dinghy full of people no problem you will have plenty of power - but to go faster - the question is why. The hull will be generating a huge bow wave, which will easily consume the power peak any practical batteries can supply, once you get much over 5 knots. The handling may be getting interesting too.
Best thing is to find retailers who have this type of equipment not hard and talk to them
Andrew Gilchrist
www.fastelectrics.com
Australia
Adam,
Radio shack used to sell an electronics learning kit for basic electronics. Seeing is believing. I am not trying to brush off your questions, but it sounds like this type of thing could help you understand what you are looking at without using expensive parts. If Radio Shack is not in your part of the woods look online for an experimenters kit to learn about motor control. All the principals will be the same with only minor changes in equipment.
You will likely get all the information you need here but like I said seeing is believing.
Kevin Pemberton
On 07/16/2012 06:21 PM, adam.riso wrote:
Hello,
I am new to the group. There seems to be a lot of great information on the group available but way over my head. I am in the planning stage of building a wooden 14' mini tug boat powered by an electric (golf cart) motor. The plans that I have go into motors, controllers, solenoids, etc. and I was hoping that someone would be able to simplify it and point me in the right direction as to what exactly are the components I need to purchase. One person who built a similar boat used: Advanced DC #A89-4001 Motor, 6HP/36-72VDC and a Curtis-PMC #1205-201 Motor Controller, 36-48VDC/350A but I really don't understand what that all means. I also have questions about what you use to give it more power (to increase the speed) or but it in reverse, etc. I appreciate any insight. Thank you! Adam
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