The use of a bicycle power train in conjunction with a large air propeller also became the favored mode of power transfer in the record setting Decavitator hydrofoils. The photograph and diagram show ...

Back in the early 90s, MIT's Prof. Mark Drela created a motor-less hydrofoil known as the Decavitator. Using nothing but his own leg power to turn the craft's 10-foot (3-m) air propeller, he got it up ...