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Old 07-15-2016, 01:52 PM   #1
Francois Barbeau
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overweight speed boat


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Hi guys, me again with another type of problem : an overweight ''speed boat''.
the boat is 31 inches long on the hull and 36 inches at end of rudder.
The total weight including both 7,2v batteries is approx 9 pounds (very heavy..)
I installed a 36-56, 2030 KV from aquacraft (brushless) with the associated esc from aquacraft too.

With this setup, impossible to take the boat out of the water, it does not pick-up speed at all.

I am planning to modify the setup as follows :
- use two motors 540 brushed with flexible shafts.
- run on 6 volts using 2 nimh batteries in parallel.
please comment and propose new ideas, everything is welcome.
Note : I am trying to keep a low budget on this project....just in case !
I did this boat from scratch, fiberglass with epoxy resin.
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Last edited by Francois Barbeau; 07-15-2016 at 02:09 PM. Reason: add photos
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Old 07-15-2016, 02:10 PM   #2
twistedge
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Re: overweight speed boat

Are you running your batteries in Parallel or Series? (Series would be the equivalent of 4S)

If you're currently running in Parallel (2S).. that would be the bare minimum power for that motor (rated up to 5S)... Before trying 4S, you'd need to check what voltage your ESC can handle (or post the model number if unsure).
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Old 07-15-2016, 03:54 PM   #3
Francois Barbeau
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Re: overweight speed boat

the batteries are connected in series for 14,4 volts as required by the esc and motor.
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Old 07-15-2016, 03:56 PM   #4
Francois Barbeau
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Re: overweight speed boat

the esc is wired from the company to run 2 7,2 volts batteries in series
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Old 07-19-2016, 02:12 PM   #5
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Re: overweight speed boat

How much does the bare hull weigh?? What prop are you running?
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Old 07-20-2016, 12:02 AM   #6
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Re: overweight speed boat

It looks great and by the sound of things it's very solid. Any way you can remove some weight from the hull like sanding it thinner. Also I would be inclined to make the rudder etc out of aluminum instead of brass that will knock some weight off. If you shorten the rudder and add to its length that will produce less drag plus sharpen the rudder that will help too. What does the bottom of the boat look like? You may have too much drag that prevent the boat from getting on a good plane.
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