Hello! I found a very affordable gearbox and built an e-foil on it.
This gearbox is designed for installing a motor from a gas trimmer on a bicycle.
I used it with a SSS 56104 motor (500 kV) and a 7 1/4 x 5 inch propeller.
I used 3D printed supports to mount the motor and gearbox onto the fuselage.
To connect the motor shaft to the gearbox shaft, I used a coupling that was machined to order. To connect the output shaft of the gearbox with the propeller, an adapter was machined according to my order.
I assembled a 12s lithium-ion battery from flat soft cells and used VESC 75200.
The assembly turned out to be quite powerful.
I made the hydrofoil and stabilizer from plywood and laminated it with fiberglass and epoxy resin.
Unfortunately, the summer was cold at first and my build took a long time, leaving me little time to properly master riding. I’ve only been on the water about 10 times. Only the last time I managed to ride a little while standing on the board. Before this I trained lying down and on my knees.
I don’t know English well and I use machine translation, so please excuse me.
I spent a lot of time trying to find the 3D printing parameters to create waterproof parts. However, over time, water still penetrated into the gearbox and motor. The gearbox did not have a gasket between the two halves of the housing. But there are seals on the shafts. I watched a video of this gearbox and they used to have a gasket in them. But then, apparently, they decided to reduce the cost of production. I tried to make a gasket myself, but it didn’t work out and I had to use silicone sealant.
It also looks like my bearings are a little worn out. The gearbox has some play on the shafts. Overall I don’t think my design was very successful, but I had a good experience. I believe that beginners can use a similar design. It’s probably not suitable for salt water, but in fresh water my motor and gearbox did not suffer any noticeable internal damage.
I’m currently working on improving my design. I’m going to use a different gearbox - now it will be a planetary gearbox from a car starter, this idea was proposed several years ago by a member of this forum ArtemkaMax. I also want to try to make my own motor with a direct drive. I want to try using a stator from an asynchronous motor for this. I don’t know yet whether I will succeed or not.
I thank the creators and participants of this forum, especially the living legend Pacificmeister and my compatriot Anatoly (thread “Build from Moscow!”).