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Old May 29, 2004, 11:57 PM
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seabee's Avatar
Shelton Wa. USA
Joined Feb 2000
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Yippee!
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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Old May 30, 2004, 04:28 AM
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reaper's Avatar
Joined Feb 2004
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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!.
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Old May 30, 2004, 08:55 AM
Useful Idiot
Asturias, Spain
Joined Mar 2001
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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.
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Old May 30, 2004, 11:19 AM
Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
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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.
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Old May 30, 2004, 11:55 PM
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Shelton Wa. USA
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thanks for all the info
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Old Sep 04, 2004, 03:21 PM
genastro
Lilburn, GA
Joined Sep 2004
11 Posts
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.
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Old Sep 07, 2004, 10:33 AM
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Salt Lake City Utah
Joined Aug 2004
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Jan,
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.

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

Seabee,
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.

genastro,
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.
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Old Sep 07, 2004, 12:33 PM
Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
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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.
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Old Sep 07, 2004, 08:08 PM
That's a funny word
NE Ohio
Joined Apr 2003
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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.
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Old Oct 03, 2004, 02:21 AM
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NE Ohio
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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......
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Old Oct 03, 2004, 08:34 PM
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NE Ohio
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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
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Old Nov 30, 2004, 12:49 PM
That's a funny word
NE Ohio
Joined Apr 2003
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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.
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Old Nov 30, 2004, 12:51 PM
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NE Ohio
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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
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Old Dec 06, 2004, 06:13 PM
That's a funny word
NE Ohio
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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.
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Old Dec 06, 2004, 06:14 PM
That's a funny word
NE Ohio
Joined Apr 2003
3,686 Posts
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.


Sincerely,

John T.
Product Support Technician
Great Planes Model Distributors
boatsupport@hobbico.com
"no autoresponder"
www.greatplanes.com


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