V2-8E 13 HP dual prop. You can see them at:
http://www.wesmar.com/pdf/vortex.pdf
Had to set up 24V for this level of power, hence the dedicated
batteries (in series) and charger. It'll push the bow around in 15 knot
winds... I've never done it in 20 but I would expect it would, albeit
slowly. It's installed on a Krogen 42 Trawler.