Just a quick post with some build notes.
The ESC does get quite hot. I’ve added a fan to hep cool it down. It needs to be a good quality fan though because if it’s cheap and flimsy the plastic may crack due to the vibrations.
The bearings in the NTM motor won’t last long because of the vibrations and debris. They’ll need to be upgraded to ceramic bearings and I would also recommend some kind of shield to stop dust and grit getting into the motor.
Use and ABS case for your batteries. I’ve used an angled one to make it easier going over driveways. I’ve hit trees with RC planes and seen exactly what can happen when a LiPo battery takes a knock to they need to be well protected.
If you make your own motor mount, get a metal pulley for your motor. Mine was mounted so it looked straight to me but it must have been marginally off axis because the belt was putting pressure on the pulley and the outer flange popped off one day and could not be found. I’ve now replaced mine with a metal one.
Again, if making your own motor mount, have it adjustable like the alien mounts. Don’t make the same mistake as me and make your motor mount adjustable at the motor (I’m in the middle of fixing this).
Use loctite for all screws and grub screws. Don’t assume that the factory that made the motor used good stuff. So many motors I’ve used have had rubbish stuff used and screws have come loose.
Don’t put a flat spot on your shaft, drill a shallow hole for the grub screw to grab. I put a flat spot on mine and no matter how tight and what loctite I used it still managed to rotate around. This defies logic but it must be under a fair amount of pressure. That combined with the vibrations must be enough for it to loosen just enough to rotate on the shaft. What then happens is because it’s a steel shaft and an aluminium pulley is they will seize.
Use a switch. I see a lot of people just using connectors to plug and unplug their longboard. Personally, I don’t think a deans connector has a strong enough hold and an XT90 is tough to get off quickly. If you’re longboarding to work or the shops the last thing you want to have to do is waste time wrestling with a stiff connector. Just flicking an off switch is so handy.
Use a low voltage alarm. WIth LiPo batteries, you don’t want them dropping much below 3.3V/cell. If you drain a LiPo below 3V/cell they can become unstable and most chargers won’t charge them. Low voltage alarms can be purchased for around $2 on eBay so it’s not much cost for a lot of protection.
I’m just doing a bit more work on my motor mount, will post a heap of photos once I’ve sorted it out.