Here's a DIY electric skateboard: The Banana Board! This board is an electric motorized skateboard which can reach speeds of 35km/h, it has a max range of 15km per charge, and can be charged in under an hour. It weighs about 11 pounds, which makes it perfect for commuting to school or work, and places where a bike would not be portable enough. This Instrcutable will show you how to build the fourth version of my electric skateboard. The instructions for the previous prototypes are available in the next step of this Instructable.
The board is controlled by a Bluetooth smartphone controller, which serves as a replacement for the bulky 2.4Ghz controller that is usually used for electric skateboards. The board also uses a series charging circuit, so you can charge the battery all in one go. This fourth prototype is more refined than the previous ones, and is comparable to commercial electric skateboards. The deck was a new custom design made on a CNC mill, and the case for the electronics was also custom made from fiberglass.
In this version I've also used a new chain drive. This new chain drive provides better stability when starting from a stand-still, and is much more durable than a belt drive. It can also deliver much more torque than a belt drive. The best part about this new drive system is that it is compatible with the old ones, so you can build a belt drive if you want (belt drives are quieter).
Version 1.0 is a very simple approach to making an electric skateboard, while version 2.0 has some more advanced features; and the video also explains a lot more about the belt drive.