@lowGuido Yeah, being complicated and expensive are definitely downsides, but it doesn’t necessarily mean it’s a bad idea. I’ve only heard of CVT’s in small vehicles: small fuel efficient cars, scooters, and go karts as @Pantologist also mentioned, so what smaller vehicles do we have than our e-boards? lol
@Pantologist The only thing I’ve found on a small cvt is this video from 2008
Even with it being that small, the amount of space between the center of the trucks to the start of the wheels is very limited. Putting a cvt system inplace of essentially the belt and pulley system we have now would be very hard.
…Not saying you shouldn’t do it, you just reminded me of @lowGuido’s build. As far as I know, he’s the only one to try an uneven kv dual drive.
haha yeah been there done that.
you want a list of what I have tried and my thoughts on them??
single wheel drive pros: light weight, economical, long range, simple. cons: low on torque, not so great on loose surfaces, hard carving on the offside can lose traction.
Dual rear drive pros: awesome torque, good hill climber, good for heavier riders. no traction problems. cons: heavy, uses more battery, need wider trucks, more expensive.
Dual diagonal drive if you set it up heelside rear and toeside front this makes the ultimate carving machine! pros: same as dual rear except you can use narrow trucks. cons: same as dual rear.
uneven dual drive this involves the combination of a big motor and a small motor (in power not size) this is like a twin turbo high speed boost super fast! pros: low end torque combined with high end speed, super fast!! cons: expensive, heavy, still only roughly equivalent to single drive torque.
direct hub drive as far as I can tell so far these are king!! pros: loads of torque, no belts to skip or snap, and looks a bit more normal cons: High voltage required, large diameter is starting to get a bit too big for my liking.
I don’t trust hub motors because my riding style involves riding off curbs, staircases, and eventually boardslides. I don’t believe a hub motor is strong enough to outlast my satellite motor, and belts are still cheap.
I am wondering about using something like THIS as a 90 degree friction drive system. It could be mounted flat on top of the truck with a simple clamp and quad drive would cut the amps way down. My list of science TODOs goes on and on. Too bad money is still a thing. @lowGuido your stack is inspiring!
I dunno… im currently testing Jacobs hub motors and I have a set of hummies on the way, the things are solid!
But direct drive motors don’t really have a gear ratio right? I’ve only seen one direct drive with a planetary gear system, but just looking at that thing screams hard to maintain because
the ones im testing have a 1:1 ratio being direct drive. but they are like 70kv or something… actually that the only downs side… you need to run like 10S or 12S to get any decent speed out of them… I like my small 6S systems.
Ok…uneven dual drive…
So like offset KVs?
yeah man. cmon pay attention. Crickey! Strewth!
Ok saw he other thread from Aug 15’ … I guess some bathroom reading is in order👍🏻
hey PS. @claudiofiore88 I don’t want to poo poo the idea… its a great Idea, and I hope someone builds it! mini CVT would be awesome.
hah, I think @nowind could be one of the first ones to try this out (by making it)…
There just needs to be enough influential figure to impact this decision… I hope something does come along one day what would make @nowind to make this crazy mini-scale transmission for eboards.
From what I’ve seen, @nowind from machining perspective should be up for this job with no problems 
Once it would be built some calculations could be made, such as: does it outweight the cost / use of sensored system vs transmission system (cost, max speed, energy usage etc)
Cvts seem ideal for combustion engines where the torque is limited to a smaller range of the possible rpms than electric motors are. With an electric motor you can get decent torque from almost a standstill and at much higher speeds, not so with a combustion engine without a variable gearbox or a cvt. They’re pretty efficient but seem an unnecessary complication with electric. Except if u have an electric motor that’s really small then I can imagine it would be a benefit. Seems simpler to get a bigger motor, but cvts are cool and love to see one on a board
If anyone would know the basics of CVT -_- CVT transimssion have very poor efficiency at low RPM’s, so for esk8 it’s useless. You should achive higher top speed but when it comes to launch and hills it would be quiet poor
How much higher RPM would that be?
isnt 4000-8000 rpm high enough? Most petrol engines mostly work in 2-4 range anyway, I think
Probably you don’t know but cars CVT are more advanced they’ve got additional electrohydraulic system which allows them to set proper gear even if they don’t have such high rpms. This also would be hard to fit (for sure new design of trucks). You need to design CVT specially for the engine(torque) which is another problem. Another thing is that you will have to use high rpms more often and this will probably lower lifecycle of your motor but i’m not sure.
Sorry for me English.
Your english is quite okay! I can understand everything!
Thanks for educating us, as it turns out you are more advanced in this fields than the rest of us (at least for the ones joining this discussion…)
Too bad that they are not effective in low rpm range… I assume a 2 different motor or 2 different gearing system would work better then!