Hammer aquacraft - RC Groups
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May 30, 2004, 12:57 AM
Registered User
seabee's Avatar

Hammer aquacraft

does any one know if I can run 8 cells with this boat it says 6 to 7 cells on the box it has a 550 motor I think the motor would take it but I dont know about the ESC thanks for any help
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May 30, 2004, 05:28 AM
Registered User
reaper's Avatar
I would not reccomend running it on 8 cells,most common 540/550 sized motors will run best with 6 or 7 cells.The factory speed control is
designed for
a light/medium duty application.By adding an extra cell it may malfunction or burn up.You could replace the stock motor with a modified motor,but you would have to upgrade the speed control.Cheers!.
May 30, 2004, 09:55 AM
Useful Idiot
If you do decide to risk it, reduce the prop a size or two. That will go some way towards turning the prop at the higher speed without drawing so many amps. However, as reaper says, 550 motors aren't very happy with 8 cells. The 600 motors are better for 8 cells.
May 30, 2004, 12:19 PM
Boaters are nice people.
In addition: if the ESC isn't yet watercooled, make it so!
You just may draw a few more Amps before it shuts down.

Regards, Jan.
May 31, 2004, 12:55 AM
Registered User
seabee's Avatar
thanks for all the info
Sep 04, 2004, 04:21 PM

Fast hammer

My Hammer out of the box ran very slow on the lake, until a fellow skipper removed the motor, filed a flat spot on its shaft, reconnected the set screw.
With a 6-cell 3000MHa, NiMH battery it flew across the water.
Sep 07, 2004, 11:33 AM
Registered User
Bash_N_Thrash's Avatar
I dont think the stock ESC in a Hammer can be water cooled. It looks like this.

Notice that its shrink wrapped and epoxied (or something) and all sealed up. Pobably better to just buy a new one vs. trying to modify it.

Good Call on downsizing the prop. I didnt think of that.

To downsize the prop the easiest cheapest thing (IMO) to do would be buy a new one and file it down to size. There arent alot of props that fit great on the stock EP Hammer. If you dont mind being the guiney pig, I'm sure the rest of us with stock Hammers would be interested in knowing the results of adding an 8th cell to stock motor and ESC.

Are you saying that the coupler was slipping or something? The stock motor and prop shaft should have had a flat spot on them already for the set screw to grab against. Or is it something different? Please elaborate. I'm always looking for cheap speed.
Sep 07, 2004, 01:33 PM
Boaters are nice people.
Hi Bash,

I agree it's not easy, but everything can be watercooled if you set your mind to it and be a bit inventive, and aren't we all inventive, being boaters?

If you remove the shrinking tube, establish on which side the power fets are and glue on a copper platelet with a copper pipe soldered onto it (previous to the glueing!), re-shrink the esc and connect it into the cooling loop first, then continue to the motorcoil, you're in business.

Regards, Jan.
Sep 07, 2004, 09:08 PM
That's a funny word
I also had the trouble with the shaft coupler slipping. My prop moved back and stranded my boat on it's second run..... I did grind a flat in the motor shaft, the other end had one. Now they are sending me a plastic coupling to eliminate the glitching.

As soon as I get my new prop then I'll let you'all know about running on 8 cells as I already have the batt mounted in there. All else will be stock for now.
Oct 03, 2004, 03:21 AM
That's a funny word
Here is the update, after having to replace a cell, I've got about 6 runs on 8 cells, no other changes. Runs good, with more speed and pickup.

Most trouble I'm having is broken props and finding a good spot to run the boat......
Oct 03, 2004, 09:34 PM
That's a funny word
I just tested the hammer with 12 cells on the bench. Time to hit water with 10 or 12. I'm wondering where I want the extra weight? There is plenty of room in the back would that be good?

ps a 27 turn motor with 0 timing should do just fine on 12 cells
Nov 30, 2004, 01:49 PM
That's a funny word
I'm trying to find out what specs are the stock 550 motor in hammer

Anyone know for sure? Don't know if this number means anything

851627B4E it's stamped in ink on the flux ring

I originally thought it was 27 turn, but someone said they unwound one and was 16 turns
I know for sure the timing is advanced a little bit and is 550 size mabuchi type.
Nov 30, 2004, 01:51 PM
That's a funny word
Update on the 8 cell hammer is doing just fine. It has proven to be a good hop-up without changing any thing else. My kinda hop-up I have to put a battery in it antways haha
Dec 06, 2004, 07:13 PM
That's a funny word
Here's what I e-mailed Aquacraft

Hi, I was wondering if you can tell me what the specs on the ep hammer
motor and esc are?

I'm interested to find out the number of turns of the motor and

the turns and amp limit of the ESC.

All I can find is the part number of both and it says it is the same as
the bristol bay boat, but don't list the specs or limits. Thanks a lot.
Dec 06, 2004, 07:14 PM
That's a funny word
Here's what the answer was.

Thank you for your recent email. The ESC that is in EP Hammer can
only handle 27-turn stock motors. I have no information on the motor
exept that it is a 27-turn stock motor.

I hope you find this information helpful. Should you have any further
questions or concerns, please do not hesitate to contact us at this
email address. (Please be sure to copy all previous e-mails into any
future questions.) You can also reach our product support technical
team at 217-398-8970, or via fax at 217-398-7721.

DID YOU KNOW that our web pages now all contain FAQs? (Frequently asked
questions) Please drop by and take a look! We hope you'll find the
information helpful and valuable to you.


John T.
Product Support Technician
Great Planes Model Distributors
"no autoresponder"

Time to go to work bench........

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