Help With #3420 Novak Crawler Motors/ESCs

[sunworksco]

I need to pick an expert's brain about Novak #3420 Crawler motors.
I want to use 2 of the motors independently to move a 94.5" long x 8.5" wide rc submarine with two 3" props.These motors are 1,800KV and I will be using 6volt A123 batteries.I can use a belt-drive gear-reduction system all the way down to 6 to 1.I am also planning to use the ESC fan output for a cooling pump to cool the ESCs/motors.The submarine will need a speed of 0 to 10 mph for scale speeds.
Everyone at the submarine forums are mostly "old school" and want every good submariner to get by on brushed motors but there must be a way to use these brushless motors.:idea:

 

[EeePee]

What's the question?

You'll need two speed controllers to control the motors.

Two motors cannot be run by one controller.

 

[sunworksco]

Novak #3420 Submarine Help

Know that.
Just want to know what gear ratio is needed and what kind of heat will be developed at low speeds.If the forum can't give me guidance,I might as well go back to brushed motors.

 

[EeePee]

What size and type and wind brushed motor are they typically using?

What gear reduction do they use with the brushed motors?

With the literal thousands of choices of brushless motors, how did you settle on the Novaks?

 

[sunworksco]

Novaks

The #3420 motors are the slowest since the KV is 1800.
The brushed motor used would be as below with a 2.75:1 belt-drive reduction.
Decaperm 6v, 8500 RPM, 5-pole motor with built in 2.75:1 belt-drive gear-reduction. Very high torque, medium RPM, low current motor. Ideal for large tugs and trawlers.

 

[NovakTwo]

I need to pick an expert's brain about Novak #3420 Crawler motors.
I want to use 2 of the motors independently to move a 94.5" long x 8.5" wide rc submarine with two 3" props.These motors are 1,800KV and I will be using 6volt A123 batteries.I can use a belt-drive gear-reduction system all the way down to 6 to 1.I am also planning to use the ESC fan output for a cooling pump to cool the ESCs/motors.The submarine will need a speed of 0 to 10 mph for scale speeds.
Everyone at the submarine forums are mostly "old school" and want every good submariner to get by on brushed motors but there must be a way to use these brushless motors.:idea:

You should probably contact tech@teamnovak.com. Explain your desired set-up and everything you want to use.

 

[sunworksco]

Submariner's Dream

Been there,done that.Talked with tech dept. twice.
Have not been able to speak with anyone at your tech dept. that is thinking or engineering out of the Crawler box !
I am a member on the www.subcommittee.com forum but only Germany seems to be using brushless motors in their submarines,so no help there.
It would be an advantage for your company to break throgh the waves,so to speak,by introducing your self on our forum and explaining the geat benefits of your slow revving brushless crawler motors for large scale (94.5" length) submarines.Most brushed motor combos that the Subcommittee members are using are 100 year-old technology and are costing close to what your #3420 motor/ESC combo is costing and if there is a way to eliminate the gear reduction system the better.Please help me out here.anxious to get the drive-train installed.

 

[sunworksco]

Batteries

In large submarine hulls we have the benefit of using low voltage high amperage batteries.I can use 4.8-7.2 volts.

 

[NovakTwo]

Been there,done that.Talked with tech dept. twice.
Have not been able to speak with anyone at your tech dept. that is thinking or engineering out of the Crawler box !
I am a member on the www.subcommittee.com forum but only Germany seems to be using brushless motors in their submarines,so no help there.
It would be an advantage for your company to break throgh the waves,so to speak,by introducing your self on our forum and explaining the geat benefits of your slow revving brushless crawler motors for large scale (94.5" length) submarines.Most brushed motor combos that the Subcommittee members are using are 100 year-old technology and are costing close to what your #3420 motor/ESC combo is costing and if there is a way to eliminate the gear reduction system the better.Please help me out here.anxious to get the drive-train installed.

Thanks for this input. Bob Novak will be back from vacation next week end and I will have both Bob and the Engineering group take a look at your comments. We have a new dual brush speed control ready to announce that may be something of interest. There has been discussion of the use of this new dual system in boat applications.

Our brush products are way newer than 100 years old.....

 

[sunworksco]

Brushed ?

What is wrong with using brushless for my sub ?
They are used often in Germany with subs.

 

[NovakTwo]

What is wrong with using brushless for my sub ?
They are used often in Germany with subs.

Nothing. My comments were not meant to promote one technology over the other. But, I am not a part of Novak's engineering group so I suggested that someone from that department would be better experienced to offer advice.