Constance
The WWII GM-271 was removed in mid-2008 for a 23hp GE series 96Volt DC electric motor, direct drive. Still in process, an auxiliary cooling fan should allow continuous hull speed, if I could just find enough electrons!
1072 pounds of batteries should provide 30 slow miles (4 knot) or 4 fast miles (10 knot). On 10-2-2009 I installed and cabled 16 6volt 235Ahr flooded batteries (US-125) for 96 volts of fun. 10-3-2009: installed old GE 23hp continuous series DC 170 pound motor. 10-06 got prop turning on battery only! Old noisy controller, forward, and reverse! 
Motored around many times, sailed a few, then off to dry-dock (11-10-09) for some hull work. I tried to get performance data, but with a dirty hull and prop and two lousy GPS units, I can still only estimate 40 amps 4 knots.
With a large 3-blade prop (about 23Dx22P) and the boat tied up, I get: 25amps 175rpm, 50amps 225rpm, 75amps 255rpm, 100amps 275rpm. I will try for speed numbers next. Currently in SanLeandro, CA.
This sailboat is built from L. Francis Herreshoff's 1946 design #85 world blue water cruiser called Marco Polo
Hull construction started around 1971 by Michael Healy.
Engine, keel, rigging and finishing beginning 1979 by Chris Thomas, launched in 1983 in Sausalito, CA Christened: Constance, after Mr. Thomas' mother. Extensive Pacific and Atlantic cruising.
Drydock repairs beginning 2003 by Rebecca Sutton, Michael Benham, Peter Geissert, Molly Keogh & Victor Mleczko. Rechristened: Dérive, a French term for a group's wandering.
Floating repairs continue December 2005 by Mark Stafford: galley cook island designed, additional portlights & refrigerator added 2007, larger aft cabin bunk & storage added, cockpit removal and redesign, engine removal in 2008 for green repower in 2009. Re-Rechristened Constance, back to original name 2010.
LengthWaterLine: 49.2 feet (light) 51.5 feet (loaded)
LengthOverAll: 56 feet (bow roller to stern) 60.2 feet (mizzen boom to anchor)
Gross tonnage: 23 Net tonnage: 17 width: 10 feet
Three masted schooner (tern)
Hull, fore & aft peak decking: wooden bulkheads and stringers overlaid with 4 layers of "Wire Plank", forming a quilted steel mesh encapsulated by "Fer-A-Lite", a glass fiber and polyester resin overlay, with fiberglass cloth and resin outer skin. This is Platt Monfort's combination of fiberglass and ferrocement hull technologies without the cement. Another way of saying it would be fiberglass & steel mesh reinforced plastic - F&SRP.
Decking: double layer of 5/8 ply
Accommodations for 6-10
Starting foreward: sail locker, double shower, tool room, salon & single head, galley, center cockpit over engine room, aft stateroom.
Commissioning Owners' website is still up: http://www.capemendocino.com/boating.html