So I’ve been wanting to build an eMTB for a while, and this is going to take a while. It’s still a concept in my head at this stage, and it’s going to take a while to settle on some designs for motor mounts, motor protection and an electronics enclosure. As well as to save up the cash for this MONSTEROUS build.
Anyway. The main feature of this build will be the augmented steering. What I plan to do is to incorporate the x-axis of the Nunchuck to augment the steering. Basically, when you angle the toggle left and right, you will get an appropriate amount of acceleration of the motors on the outside of the turn and a corresponding deceleration of the motors on the inside of the turn. This will compensate for the increased turning resistance that a 4wd implementation forces, as well as make for a far more stable and manueverable MTB, as the turning capability is already compromised in comparison to a street board based on the geometry. There will be a similar effect with braking. The ‘bias’ so to speak will be adjustable on the fly, so you will be able to reach down to the board to adjust the sensitivity based on the trail you’re on.
Gearing will be selected for a top speed of about 60km/h, but will be easily adjustable by switching out pulleys down to a 30km/h max for increased run time. Pulleys will be 15mm width HTD 5.
The idea behind this board will be to provide a long fast ride that will enable the user to ride mountain bike trails. Highest performance possible over the longest range possible. I want to start the sport of eMTB racing in South Africa with this board. People down here love outdoor sport and race culture, and I believe this to be the next big thing.
This will be a fully open source project, and I will be publishing all mechanical, electrical/electronic and software components for this build as I want to create a sport culture designed around the DIY experience. Because skate is punk like that.
And ideas/suggestions and collaborations welcome. All the financial help possible will be greatly appreciated and needed.
This is going to be extreme.