Mono with battery puffing problems

[enzo thecat]

That's a lot of prop to spin for any length of time at over 40k rpm.

After swapping out connectors Id try either propping down or lower voltage.

Your setup would make a solid 4s setup with that prob and would achieve a few things for you. It would allow you to work on your setup, cure the amp problem and be a lot of fun instead of a lot of frustration. No, it wont be a 60mph boat but it would be a great 40-50mph boat that handles well. You could possible push it to 5s but Id keep a close eye on temps.

Here's a vid of my pursuit with a similar setup running on 4s. One of my favorites builds and still running on the same equipment that it was in the video from years ago. I've had a lot of other guys smoke equipment trying to keep up with my little 4s setup. LOL

https://www.youtube.com/watch?v=c_0Nw_g5PDo

JMO I could be wrong.

Wow. My boat isnt much faster than that! So I'd think a 6S would run cooler than 4S under any circumstances. That isnt correct?

[stadiumyamaha]

No. Heat is generally a side effect of amp draw.

The pursuit in the vid is set up for 4s using the same dia prop as yours. If I were to run the same setup on 6s it would be faster because the prop would be spinning at a higher rpm but would draw way to many amps, over heat and damage electronics.

RPM is calculated by max volts times kv. General rule of thumb for sport running and for a lot of racing is 30-35k rpm. 6s which is 6 4.2 volt cells would put my boat at a dangerous 55k rpm.

Your setup is at around 43k rpm which is doable but not with that size of prop. Thats why you see the guys running big power (voltage) have very low kv motors swinging big props. You normally can get away with both high rpm and big props for very long.

Unfortunately people are getting sucked in by watching videos of guys getting very high speeds out of rtr boats and making it look easy. They do it by pushing the equipment to the max with no concern of damage, its not a bad thing just what they dig.
I personally like to tune a boat to run as fast and handle as well as possible with whatever system I'm using and, with longevity of equipment as one of the priorities .

I was at the national this week watching the racing and spoke to one of the top electric guy who was on his third season with the same dynamite motor running on 4s. His cat was running perfectly and was probably pushing 50mph.

Check out Properchopper's cheetah on 4s. I have the same boat built about the same way both with very robust motors swinging pretty good sized props.

https://www.youtube.com/watch?v=Cl5ebHR6wR4

Sorry for rambling

[Nevs]

I once tryed 1600 kv / 6s in a twin setup with 55-14-2 props. Peaks were 270 A each motor. (about 18 pound)
With 4s. peaks were 120 A.
I only tested the boat with 6s 2 or 3 times..Then the 5000 /60C started to pop..So my advice would be never to go over 50% of the rated max continious. In this case 150 A.

https://www.youtube.com/watch?v=iKkemL3Jg-w

[enzo thecat]

I once tryed 1600 kv / 6s in a twin setup with 55-14-2 props. Peaks were 270 A each motor. (about 18 pound)
With 4s. peaks were 120 A.
I only tested the boat with 6s 2 or 3 times..Then the 5000 /60C started to pop..So my advice would be never to go over 50% of the rated max continious. In this case 150 A.
https://www.youtube.com/watch?v=iKkemL3Jg-w

What is "pop"?