I don't know if it's been featured here already, but I do know that a few forum-members were waiting for this kind of thing: The EPS Azimuthing, Retractable, Rimdrive thruster. Allthough I have my doubts about its use for conventional twin-engine + bowthruster yachts, I see many applications where this may be just the right component: 1. Single-engined yachts in search of emergency propulsion 2. Sportfisher yachts who spend lots of time trolling 3. Sailing yachts - get rid of the shaftline and install retractable azimuthing bow- and sternthrusters. Much less appendage drag during sailing! 4. Dynamic positioning with one of these in the bow and one in the stern. Rolls Royce has produced a larger version of this kind of propulsion for a while already (Ullstein Aquamaster), but that's not with rimdrive (both electrical and diesel-driven). Hydraulically driven versions can be found at Veth for example. Two still-to-built Feadships have the EPS azimuthing retractable thuster in their specification. Bruno
Rim Drive I was looking forward to the next generation of this technology wherein the 'thruster' became a 'propulsor' ... Rim Driven Propellers http://www.yachtforums.com/forums/technical-discussion/3961-rim-driven-propellers.html Exciting New EPS Thruster (& Propulsion) http://boatdesign.net/forums/showthread.php?t=9432