Hi

I am building a Graupner kit wiesel with three 6V Jumbo 2000 and need a battery that will last at least ten minutes at full throttle(10-20km/h) and is light and will not take long to charge.

Thanks

I think a large capacity LiPo battery is what you will need to satisfy your power requirements and be light weight as well.

Check these out
http://www.batteries.com/index.asp?N...atchpartialmax

The Wiesel will probably need the weight to sit at the proper water line.
It is a coastal patrol boat, not an off shore racer.[&:]
I would go with a couple of 6v 4ah wired in parallel or one 6v 7ah gel cell.
Those should get you about 20-40 minutes of running time at a proper speed.

Hi

How many do you think I should use and how would i wire the batterys so all three engines get the same amount of power. And I have got one sealed lead acid battery (6V4.5Ah) with no charger and it needs to be charged but I do not have one so how would I get it to charge?

Thanks.

I would look for a supplier of Gel Cel or Sealed Lead Acid batteries in the local phone directory. The batteries are used in emergency lighting, computer power backUPS, and even hospital equipment. The suppliers of these batteries can set you up with a nice little charger.

The ESC would be run in parallel.
The leads from the battery would be split three ways.
pPsitive and negative leads each split three ways. One lead to each Speed control, and
then each ESC will run one motor.

From the Reciever, the Throttle lead would be split three ways to the three ESC.

If you are running only the ESCs and steering,
Be sure to leave only one BEC connected, or, Disconnect all the BEC(switches on the ESC)
and use a seperate battery pack.

If you are running alot of accessories from the reciever, disconnect all the BEC and run
a separte battery pack. BEC are not rated to run much more than two servos under load.

Thanks But the only problem is that it has only one ESC that supplies all three motors, is that gona damage any thing?The reason why I ask this is because the modle was supplied with only one ESC.

You don't say how many amps a "6v jumbo 2000" draws, and you haven't mentioned what kind of ESC you have, so I can not say whether the combination will or will not work.

Any more information on the parts?

Well This modle is very old, Because my dad bought it for my grandpa and my grandpa gave it to one of his freinds to build, but the guy only got half way, and ever since then it has been lying in a storeroom untuched for 15-20 years. So i decided to take up the task of finishing it up. The only info that I have on the motors is what is on the box and all it says is 6V Jumbo 2000 and as for the ESC it never came with a box so that is all the info I can give you.

Thanks.

A good multi meter can tell you how many amps each of the motors draw.

Just hook up the motor to a battery, put the multimeter between the motor and the positive connection. Let the motor run, and read the amp draw. This will give you the unloaded amp draw. Then pinch, or otherwise slow or stall the motor shaft as best as you can. As you do this read the meter and it will tell you the loaded or stalled amp draw. Stalled will be the maximum amps the motor will demand.

That will help determine what kind of rating the ESC needs.

Being handed down over so many years, is it an Electronic Speed Control (ESC) or
is it a wire wound resistor with a mechanical wiper contact? Any pictures?

I had got the pictures but i am new to this putting pictures on the web so can you please give me a few pointers.

Thanks.

First, click on the button on the bottom left corner of the last posted message.
A new window should pop up.

After you type in your text, underneath the text window there is a link that says,

"Click here to upload images and files! "

Again, a new window should pop up and you can select your images from your hard drive.
Make sure your images are not too large. Max. 6000KB; gif/txt/jpg are supported ...
Make the images smaller if they are too big, otherwise they will not be
uploaded to the server. Larger images can take forever to upload also.

When you have your images selected, click OK, and wait for the confirmation that
they have successfully been uploaded.

Finish your message, and click OK to post

Here are the pictures of the ESC:

Gawd I hate the posting time limit,

let me try to retype this...

That is not an ESC, Electronic Speed Control.

It is a mechanical speed control.

If it came with the kit, it will most likely work alright with the boat.
I would hope the instructions came along through the generations also.
If I had to guess, I would imagine that all the motors are hooked up in
parallel, all the black wires together and all the red wires together.


As for that mechanical speed control, It looks lke there should be a wire coming from the bottom of the wiper, and wire coming from the top of the wiper. That is how it switches the polarity from the batteries to the motors.

I can't tell you which ones to hook into, because it is difficult to see the power input leads verses the output leads. And where the wires are being run and connected.

But do you think that the speed controller is fine for conecting all three motors to it to allow me to have all the engines going forward and reverse with out damaging the motors or the speed controller?

Since the setup was probably bought that way, I would give it a try in the tub, the pool, or at the bank of the pond. The set up needs to be tested under load, pushing water.

Hold on to the boat, and run it up. After a few minutes, if the wiring only gets warm you should be ok.

If the wiring and gets hot, you might consider buying updated electronic speed controls.
Smallest hazard, the wiring gets hot enough to desolder any connections... Seen that happen. Worst hazard is that the wiring over heats burns the insulation and possibly some of the components or the hull.

Edit]
See how "Electricalgod" has used three blue Proboat style Electronic Speed controls here?
http://www.rcuniverse.com/forum/m_6085599/tm.htm
One for each motor. However his motors may draw more than yours.
Testing for checking for heat or the amp draw using a multimeter the best way to verify your set up

Without placing a multimeter on the motors and testing the amp draw, it is difficult to give you any better advice or recommendations.[]

Ok I have done the water test, but I have found a few problems with the wiring the main one is that I can only work with only one speed going forward and that is fast, not slow, not medium but fast.

But other than that none of the wires got to hot after doing the test for about 5-10 minutes.
I am thinking of upgrading the speed controller just like Electricalgod has done by puting three ESC in or do you think I can fix the problem with the speed controlleror if not, have you got any good ESC's that you recomend me to use?

Dang it , I look up all these links for you, and the posting time limit deletes all my work

Simple version

Electricalgod is using Proboat good for slow med fast
http://www.horizonhobby.com/Search/D...oat+esc&CatId=

Mtroniks- good for very slow, slow, med, fast.
http://www.mtroniks.net/mtroniks_SC_...ubCategoryID=3

Again we need to know the amp draw on the motors.
Should be able to look up Graupner 6v jumbo 2000 and get a rating, but if I take the time to do that, the posting time limit will kick in AGAIN, and delete what little I retyped.


To Mods.....
GAWD I hate this time limit on this board.[:@]

I have already made a good search but I only get ebay with nothing to do with the motors, so if you want to have a search you are welcom to.

Yeah, lots of vague text referances, but no actual motors or specs.

If you know anyone that know electronics, and has a multimeter, they can check the motors, and end the question.

Without that information, the only suggestion I can make is to over rate your selection of ESC. Buy something that handles 30-50 amps, and hope they are rated higher than the motors need.

Do you thimk the ESC's in Electricalgod's boat is good enought?

It is worth a try.

If either the Pro Boat, or the Mtroniks get over heated they have an electronic cut out.
It saves the unit from damage, I haven't heard of anyone losing one yet, due to over work.

Today I had a go with the water test again, this time with a battery out of a UPS and put in the water and put the powre on while I was holding it, 10seconds later(round about) smoke started to come from the speed controller, so I shut every thing off and tought it and burn my pow little finger.

The one good thing is that I emailed Graupner about the motors and they said that the are very out of date and Know have been replaced by the speed 500 E or the speed 600 the only differance is that the amp draw is a little bit less by not that much, so I am going with that just to give us a good start.

The Pro boat ESC will certainly handle a 500 series motor. A mid rated Mtroniks ought to do well also. I would consider using heavy guage wiring to handle the loads, and if you have the where with all, add water cooling for the motors.

[8D]

Thanks you have realy helped me with boat problem and have given me some good edvise but I have just one more question, the battery that I told you about earlyer the 6V(4.5amp) would that be ok for the and if yes want run time are we looking at?