multiple sealed batteries

[Tom]

I am getting ready to build my Dumas Donzi Z-65. I am going to run
electric power. I was told that the Astro 25 is a great motor for
this boat. I was also told that they use 10amp hr each, so I would
need multiple batteries. How do I go about wiring this and what would
be a good speed control. The tech I spoke with at Dumas was a bit
vauge with this, I think I caught him at a bad time. He said I should
run multiple 12v sealed batteries that amount to alteast 20 amps hr.
He also told me that the boat takes about 16lbs inside so it sits
right in the water so weight is a factor at some point. Any help will
be great, this is my first boat like this. I have built primarilly
tunnels and fast electric Vs before this, so they were all 6&7 cell
battery packs.

Thanks
Tom

[Rob]

Your choices are hugemongous nicads or hugemongous lead-acid, right?

The people at M.A.C.K. products make a lot of their living providing
aftermarket stuff for Dumas boats, and will be able to point you in a
direction, at least. 16 pounds is a good deal of weight. I think I'd
truck over to the local hobby shop with a fish scale and weigh their
starter-box batteries. Sealed gel-cells are nice little batteries -
place 'em in any position, for instance. Once the boat is built, you
can plop it into the home test tank and shuffle them around till the
boat sits right.

Wiring 'em is a matter of putting 'em in parallel - positive to
positive, negative to negative, then to the speed controller and
thence to the motor.

[Tom]

Thanks Ill look into M.A.C.K. I just need to find a place to float
this pig. Its bigger than my bath tub!

[George Pfeifer]

Do you have a Batteries Plus store near you? They have sealed gel cell batteries in numerous Amp Hour variities and physical sizes. Gel cells work great becasue you can position them in any way that fits best. I purchased an 80 Amp hour unit from them that I use in my 1/96th scale USS Missouri. ( Just under 10 feet long) That battery powers 4 motors for over 3 hours of run time.

George

[Umi_Ryuzuki]

I used to run a 24" deep V, scarab style go fast, on an old 480T Lemans RC car motor, electronic speed control and a 6cell ni-cad pack.

The running time was about 10 minutes
If you start loading up the boat with batteries you will have a hard time getting it up out of the water.

If speed is not an issue then Gel Cells will work.
If you can find some surplus 12- 24 volt "Pittman" motors they will cost around 10-20 bucks a piece.

My 78", 1/72nd scale, Light cruiser gets plenty of speed on two of these motors. They are direct drive, no gears, and the boat moves so fast that in choppy water the wake will break over the bow. The weight of the boat is 30 pounds or more. Running time, ALL day.

(2) 24 volt pittman motors
1 Electronic speed control
1 reject 12v-7ah battery from the hospital maintainece shop...

Total cost $80 dollars

result.... :cool: