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High KV in a boat?

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Old 06-19-2017, 07:47 AM
  #1
OutlawRC
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Red face High KV in a boat?

I have been on 2 and 4 wheels since the 80's but would consider myself a noob with brushless boats.
I've got the 29" Rio EP (owned for maybe 5-6 years) and runs the stock brushed set up. Now I've got the itch to make it a little faster and ordered a way overkill esc (150a).
The reason I ordered one this big is because my LHS said I could stick a car motor in it without issue, and I've got a few laying around, seriously debating on the Viper 4.5r 4500kv.
Sticking with 2s due to lack of room.

So, my question is this...Since I see mostly lower KV and higher torque motors in boats will a higher KV motor work ok in a set up such as this? It's already plumbed to cool the esc and the motor.
My other options that I know I have laying around is a stock 17 turn, a Novak Ballistic 5.5, and sure I have a few others but nothing in the 3700-3800 range which is what I would like to try.
Thoughts on the 4500?

Anyway, during the process of soothing my upgrade itch I went ahead and ordered a 37" Inception and should be here tomorrow. Already got the batteries and everything I need for it I think.
Still thinking about making the Rio brushless.
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Old 06-19-2017, 07:49 AM
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I also have the thought of placing the 150a esc into the inception (since they evidently have heat issues with the stock 90a on 6s) and putting the 90a into the Rio.

Last edited by OutlawRC; 06-20-2017 at 05:57 AM.
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Old 06-20-2017, 12:11 PM
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I believe I also have a Leopard 1900KV 550 can size. Would prefer to leave it open in case 1 of the 1/8 scale monsters need a replacement, but could consider it if my other options are not suitable.
Any motor I have on hand would use the stock wrap around water sleeve for cooling since technically they're not boat motors.

Sooooo...what do ya'll think about installing the Viper?
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Old 06-20-2017, 03:35 PM
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The Viper motor will work fine with the right prop. Try a 38mm diameter prop to start. We run motors with that Kv successfully in 27-30" boats, just watch your heat on summer days. You'll need a 120 amp ESC at a minimum, the 150 is better.




.

Last edited by Got RPM; 06-20-2017 at 04:04 PM.
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Old 06-21-2017, 04:40 AM
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Great feedback, thank you for the reply. Makes me feel better about getting the 150a esc then. That think looks huge for that little boat...
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