3 ms·

you are describing the sailrocket. The designer intended to outfit larger ships with the technology. http://sailrocket.com/ http://sailrocket.com/

• googlryas 9y ago
  Where does the funding come from for something like this?
• CodeCube 9y ago
  That is extremely cool, but no, it's not the one I was thinking of ... this one was explicitly targeting the application of ferries in SF bay.