Hi everyone,
I’m building an esk8 with a friend who’s really skilled in mechanics and electronics. I want it to be very powerful, and the configuration I’ve chosen is 4WD with 6395 motors at 205 KV, all running on a 20s8p setup. I know it’s extremely powerful, but I’m the kind of person who loves having powerful vehicles, even if I end up riding calmly.
Has anyone built a similar setup? Do you think the belts will hold up, or would it be better to switch to chains or gears? I plan to use 25mm wide belts for each motor. I’ll be using Spintend controllers (85V, 250A).
I do not recommend using belts in powerful units. They slip, heat up, wear out quickly and start to crackle very quickly. And if you still want to use them, I advise you to use the upper and lower tensioners with a 16-tooth motor pulley in the htd5m profile, and it is better to use reinforced belts
Thank you for your opinion. Do you mean it’s crazy because I will encounter problems? Will the motor overheat? Or do you mean crazy because the skate will go too fast?
Do longer belts help? Better tooth engagement and less sharp bends. I’m on 520mm belts atm.
Also, on the post rather than the comment 205kv is very high for 20S, less so if you are wanting insane speeds. Casual riding and a large gear reduction will have you losing lots of power just spinning the motor.
you’re gonna run into a lot of heating issues. on 20s 205kv. i was running 18s 205kv and had heating issues on the warmer days even when i wasn’t pushing it. if you’re gonna use this board for cruising, i’d highly recommend going 173 or even 150kv to improve your thermals if you’re staying on 20s
i don’t even know if people make pulleys compatible with 25mm wide belts. i’d personally go with gear drives (all metal) or chains.
i’d also recommend getting smaller motors in the front (6465’s or 6455’s) cause otherwise, you’ll be spinning out your tires because of the power and yes you could tune them down but that’s just unnecessary weight atp. the 55’s still have enough power to spin the fronts with enough amps
95s in the front are way too overkill. I run 85 in the front 95 in the rear.
You have to turn down power a lot in the front with these motors.
The only benefit you’d get from going to a larger size is that you can put down more power for braking.
I think 20S 205KV might be a bit too much. I am running 21S 175KV at 200A acceleration in the rear and 200A braking in the front per motor. And below 100A each in the front for acceleration and in the rear for braking. No heating issues with that. But, with this much torque you gotta gear for high speeds, otherwise the motors spinning so fast will generate a lot of heat during prolonged high speed runs and then you’d have heating issues.
That said, my board is a raceboard and is pretty much never used off track. For prolonged high speed use it might have heating issues.
As everyone has already stated, 205kv at 20S is a LOT of motor rpm. You’re gonna be running those motors very hot doing that. I was pushing my motors temps quite a bit at 18S 205kv. Drop the kv, theres no real reason to need that much.
Also there’s no way you wouldn’t be getting belt slippage at that torque. You have to go steel on steel gear drive I am afraid. It will be pretty loud.
Chains are also an option, but you have to go iso 6b which are fairly large so they limit the maximum gear ratio you can have. At that voltage and KV, you’d end up gearing for a top speed you could never reach unless you have a closed off runway… And they are also loud and I prefer the sound of gears personally.
And regarding the ESCs - I am not sure how durable the recent spintends are, but I’ve seen quite a lot of spintends blow up in the past, so I wouldn’t necessarily recommend going that way.
Like @Dinnye wrote. For chain 06b You have dimensional limits. For 8inch I would recommend around 41t. And for motor sprocket is better more tooths also to avoid polygon effect. 9t is most smallest for easy fit to motor. So basically You should calculate with most biggest ratio 41/9 gear. Lower kV motor needed.
Steel gear drive and chain drive is definitely recommend at that power. I’m currently running 21s 170kv Flipshit and so far no thermal issue yet, granted it’s winter here so temperature is around 40-45F usually.
I would suggest maybe building a 2wd first if this is your first build. You can do a 2wd build and leave room for a 4wd setup. Make sure the 2wd works reliably and figure out all the issues first, will be less work to do in the beginning vs a 4wd build.
Edit: My favorite phrase to describe esk8 is “It’s always something”. There will be problems after problems when figuring out a build.
