Fins and fin mounts (compatible with commercially available fins) were hastily 3D printed from ABS. Fins were reinforced with aluminum rods but the fins were actually very strong without them. The weakest point of the fin is by far the point where it is held by the mount. The fin mounts were attached to the board with epoxy/microballoon slurry, where balloons were added until the mixture had the consistency of yogurt.
|The aluminum bits are where the screws contact the fin and push inward/up to hold it in place.|
|Attempt at foam with kitchen sponges. This did not work.|
Next was the motor mount, which involved very very drippy microballoon epoxy and an aluminum plate with holes for 80/20 to be attached. It looks like crap and I know it.
|It's a surfboard?|
Sometime in October, a few friends and I headed out to test. It wasn't a sunny day but the weather wasn't bad. I had a wetsuit so I stayed pretty warm throughout the trip. Huge thanks to Tommy, Calvin, Dan, Rodrigo, and Andrew for helping out!
|Everything was tied down with twine, especially the motor and GoPro.|
By the way, the battery is in my backpack along with a whole bunch of foam for buoyancy in case it falls off.
|It floats... but lower|
|I went about 1/3 of the way across before turning back.|
There is footage of the trip but it's 30 minutes long and I haven't edited it yet. Overall, the trip was a success. The motor didn't push me nearly fast enough to stand up. This was partially due to the motor's power being fairly lacking (it is the smallest of its class) and also because when I was just sitting or laying on the board, I was mostly underwater, providing more resistance and making it more difficult to gain speed. I topped out at about 5 mph, which was still quite a lot of fun. Also I haven't grown any extra limbs since being in the river, so I've got that going for me, which is nice.