Kroker Engineering & Development Stuff - RC Groups
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Aug 16, 2007, 01:06 PM
woodybob's Avatar

Kroker Engineering & Development Stuff

Hi All,
Just wanted to share my new acquisition. WooHoo!
Last edited by woodybob; Aug 03, 2008 at 03:28 PM. Reason: Changed Title
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Aug 16, 2007, 01:55 PM
3 Blades to the Wind
Shaun Hendricks's Avatar
If these motors are so popular, why doesn't someone mill up a knock-off and make bank off of them? A few minor changes and patents wouldn't be an issue...

What was the going price of this style? $50-$200? I smell opportunity...

It looks like here are the requirements:

1. Built in motor mounts
2. Open brush set
3. Easy serviceability
4. Solid construction
5. Built in watercooling
6. Hex end shaft

If I were building this motor I'd add:

A. Angled, cylindrical brushes - easy to maintain and slide. Watercool them.
B. Fully watercooled case, molded/milled right into the system, efficient path. Possible water cooled shaft as well.
C. Fan on the shaft to force air down the winding path.
D. Switch hex end for torx style with central tapping for custom CVD style joints to be added onto the end with popular driveline sizes available for the other side of the CVD.
E. Mill it out of aircraft grade aluminum and fully anodize it with water repellants also.
F. Offer screw on terminals for optional screw on Waterproof ESC.
G. Same screw on battery terminal block also would have options for all the popular power connectors (PowerPole, Deans, etc.). Plug and play.
H. Make various hull shape mount blocks out of styrene or other easy to glue plastic. Offer different angles for V hulls, flats for cat style, and even some universal mounts for odd connections- make them all with vibration dampening blocks molded in for the motor to bolt on to.
I. Offer multiple armature windings and types of windings, just slide in.
J. Design in gearbox options or attachement points.
K. Offer high end models with super precision components. Sell the components separately so a 'basic' motor can be upgraded over time to the best model.
L. Make several sizes of motor cases to match current 300, 400, 500, 600, 700, 900 series motors and make a 'goliath' version that is rated at 3+hp for those super large models.

Those of us with small pocketbooks can still get by with the normal motors. Those with the desire for this 'super' model can buy and upgrade as they like....

What do you all think? Add your own ideas! Let's design the perfect boat motor instead of adapting car, plane and generic motors!
Aug 16, 2007, 04:59 PM
Grumpa Tom
Kmot's Avatar
Well, it still wouldn't be a Kroker.

Aug 16, 2007, 05:28 PM
Give the dog a bone
Boatfox's Avatar
Originally Posted by Shaun Hendricks
What do you all think? Add your own ideas! Let's design the perfect boat motor instead of adapting car, plane and generic motors!
Skewed armature
Hand wound armature
epoxy ballanced
Ball bearings

I think 3 flavors to start...1 high 15K RPM for the Hydros (like they'd venture away from brushless), 1 mid range RPM (8000), and one torquey monster turning (4000) and drawing 5 amps or less with a 4" prop
Aug 16, 2007, 05:41 PM
Grumpa Tom
Kmot's Avatar
Poor woodybob. Didn't even get one reply before his thread was hijacked.
Aug 16, 2007, 05:57 PM
"day ain't over yet-"
der kapitan's Avatar
Originally Posted by woodybob
Hi All,
Just wanted to share my new acquisition. WooHoo!
Looks like you have both a Sea Pup and a Sea Wasp.

Now that you have them are you going to run the things or start a museum?

Nice precision pieces, aren't they?
Aug 16, 2007, 07:07 PM
woodybob's Avatar
Runners. I hope to put the SeaPup in a Dumas Barrel Back. This is where the SeaWasp lives. Dumas 24' Chris Craft. Oh, and you're right, they are nice precision pieces. As far as I know, the only motor made specifically for model boats.
Last edited by woodybob; Sep 06, 2008 at 05:43 PM.
Aug 16, 2007, 08:28 PM
Boats on the brain!!
green-boat's Avatar
You BUM!!!!

For years I've wanted a Kroker. I remember seeing them spec'd on many boat plans when I was a kid.
Aug 17, 2007, 11:22 AM
3 Blades to the Wind
Shaun Hendricks's Avatar
Kmot's right, I did hi-jack the thread... sorry about that woodybob.

I understand there is some historic allure to the motors, so congratulations on the acquisitions.

If anyone is interested, perhaps we could start a motor design thread...
Aug 17, 2007, 11:47 AM
woodybob's Avatar
No problem Shaun. These motors were built to mil-spec tolerances. I think they look cool and perform wonderfully for my needs. I plan on putting one into a Dumas Barrel Back. Look at the difference. Will this be neat or what?
Last edited by woodybob; Aug 17, 2007 at 03:21 PM.
Aug 17, 2007, 11:53 AM
Boats on the brain!!
green-boat's Avatar
Jun 19, 2008, 09:46 PM
Mmm, tugs...
patmat2350's Avatar
Found this ad in a 1972 British magazine...
Jun 19, 2008, 10:25 PM
woodybob's Avatar
Nice Pat.

Old school fer sure. Put the pix in my Kroker file. Got more? Thanks...

I know of other Kroker literature out there, wish I could get a hold of it.

Who's got it?
Last edited by woodybob; Aug 04, 2008 at 10:20 AM.
Jun 19, 2008, 11:08 PM
Grumpa Tom
Kmot's Avatar
Into my file as well. Yes, anyone have more lit pics they can upload?
Jun 20, 2008, 01:17 PM
Registered User
Here are the scans of the Kroker catalog. Ray at one time had considered coming to the PNW with his manufacturing. Jerry J.

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