Anthony Brock's Electric Surfboard Project

The project goal was to design and build an electric motorized surfboard. The electric motor and propeller fit into a standard
longboard fin box. The propeller is in place to replace paddling.
The board will propel itself out to the line-up and into a wave. Once riding a wave, the board uses the forward motion produced from the wave to continue to spin the propeller and produce energy from the electric motor. This energy is stored to recharge the batteries. The board is essentially a miniature wave energy power plant. The board uses a small commercially available electric trolling motor and a 12V 7.2amp-hr battery. Wires run along the deck of the board under the glass next to the stringer from the battery housing back to the motor.

As this board was a prototype there were some problems. It was difficult to keep the battery compartment on the top deck of the board waterproof. It was flooded with water several times. Somehow the motor continued to work even when flooded, but I was shocked a few times when trying to take the battery out of the flooded compartment back on shore. The board itself was huge. It turned out to be overbuilt and did not need to be quite that large. It is a 10'8" x 30" x 5.5" SUP. I first tried the board out at the Santa Ana River jetties just because it was close and I wanted to get it into the water right when it was finished. The board powered through the crashing waves and quickly got me to the line-up, but it was very
difficult to actually ride a wave because of the size of the board.
It does not turn easily and it tends to pearl. I was able to catch a few waves there, but I had much more success at SanO. The problem at SanO, though, was that the seaweed floating around in the water kept getting caught on the propeller.

Work is still being done on this project as a hobby. Future developments will have everything housed in a single attachment that can fit into a standard longboard fin box. This way any longboard can be modified with this device. We won't have to worry about running wired to a battery housing on the top deck anymore. I am also working on incorporating a flow sensor that will detect the speed of the board while riding a wave and adjust the speed of the motor to counteract the drag caused by the motor. A wireless motor controller that you can wear around a wrist is also being developed.

That's a brief overview of the project. If you have any questions feel free to ask.