Just had a brief look at http://www.boatdesign.net/Directory/Propulsion/Electric/
20 knots cruising, on the ocean, what sort of springs does it have?
Manufacturer of the Africat 420 power catamaran, a luxury, high-performance 42ft cruising power cat with a cruising speed of 20 knots. Headquarters in Fort Lauderdale, Florida, USA. (Added: 19-Dec-2005 Hits: 3828)
But then there's also data on a 90% efficient motor that makes coupling to a diesel genny work well. Put the genny where it's quiet or close to cg and put the motor(s) on retracting legs. It's an option.
Ex Prout 31 Sailor, Now it's a 22ft Jaguar called 'Arfur' here in sunny Southampton, UK.
A few places left in Quayside Marina and Kemps Marina.