I built a boat with the Sabb controlable pitch gear. It is very rugged and simple. There was a single lever control for the variable pitch. The throttle was separate. There was no transmission, only a manual dog clutch. The gear worked very well--but it was in a sailboat, where the effeciency is probably best used when motor sailing. Also the two bladed prop could be feathered behind the deadwood and thus drag was reduced to almost zero (especially since the feathered blades filled most of the aperature.) In used I would bring the engine up to cruising RPM and slowly increase the pitch of the prop, until the engine slowed, then backed off 100 RPM. It is hard to divorce the effeciency of the prop from that of the very simple Sabb engine--38 hp would drive the 38 foot boat at 7 knots in flat water. Even bucking into heavy head seas around point Conception I maintained 4.5 knots. The effeciency was certainly better than a folding Martec--but I cannot say it was better than a 3 bladed prop of similar size. http://www.kastenmarine.com/CPprops.htm#I.%20CPP%20RATIONALE Has a section of the aspects of CCP props. Also Michael Kasten comments on Trawler World at: http://lists.samurai.com/pipermail/trawlers-and-trawlering/1998-January/000242.html http://lists.samurai.com/pipermail/trawlers-and-trawlering/1998-January/000147.html I do not know the current status of Sabb's operations. The current web site is only in Norweigan. I did order my engine and CCP directly from Sabb in 1978. The transaction was easy and we did our own importing. Bob Austin