The Revolve Team have been carrying out more development work on the hydrogen powered Cheetah Marine catamaran, converting one of the Honda 135HP outboard engine to run on hydrogen (and still run on petrol if required). The 9.95m Cheetah vessel is believed to be the first marine example where a Hydrogen Internal Combustion Engine (H2ICE), producing only water and no carbon dioxide, is used for propulsion.
The recent work culminated in the engine successfully powering the boat for a full 55-mile non-stop lap around the Isle of Wight. By optimising efficiency at low speed and high load, the engine was nearly twice as efficient on hydrogen than it is on petrol, and the boat arrived back at Cheetah Marine's Ventnor base with the tanks just under half full of hydrogen after the 8-hr trip.
This story was also featured on the BBC.