The physics of a foiling AC75 are as simple as they are complex, but envision a large windsurfing board with towering sails; there is no heavy keel to help keep it upright like a traditional sailboat.

A motor is added to the foil to reach speeds of 25 mph. Here's how the eFoil is built. Lift Foils starts with a high-performance board. A foil is added. Then a silent, electric motor is attached ...

In the video, Breen is balancing on his wing foil board in the water when suddenly, a giant whale breaches the surface and collides with Breen. As the clip continues, Breen gives a surprised yelp ...