Brian Posted October 14, 2019 Report Share Posted October 14, 2019 https://www.youtube.com/watch?v=fO862lWuBdE&feature=player_embedded Colin-58, Kingfisher 126, Steve S and 2 others 5 Quote Link to comment Share on other sites More sharing options...
Colin-58 Posted October 14, 2019 Report Share Posted October 14, 2019 Very interesting indeed Brian, i put a new engine on my boat earlier this year and went through a process of testing 3 props, one aluminium 2 stainless, the advice i was given about the stainless was not correct it was a prop called appolo, the best prop i found , after doing very accutate tests up wareham channel was called balistic. it seem to out perform all the others at most stages from idle to flat out ,. at preferred cruising speed especially. i achieved a top speed of 28 m p h . o yes and by the way at 25 m p h i passed the only boa t visible in the whole area on a sunday afternoon which was harbour control. i did a quick u turn to explain my reasoning for being there, they gave me a positive response told me to be mindful of any other boats if i met any, and said they would look the other way . phew i thought my sense of humor and quick thinking honesty has probably just saved me£ 1000 fine and or 3 weeks porridge! after this testing i also had the pitch increased to add further fuel efficiency The Sharrow prop seems to suggest a further 15% fuel saving could be made. i will try and pursue this but dont expect it will be easy. i will do some research. and update my findings. price ? i think 1 and 1/2 to twice the price of normal stainless prop may be? Colin. Jim 1 Quote Link to comment Share on other sites More sharing options...
mw Posted October 17, 2019 Report Share Posted October 17, 2019 Good job the speed limit was lifted they would get you if they could mw Quote Link to comment Share on other sites More sharing options...
Colin-58 Posted October 17, 2019 Report Share Posted October 17, 2019 Read it properly ! Quote Link to comment Share on other sites More sharing options...
Mikey B Posted November 4, 2019 Report Share Posted November 4, 2019 Interesting but I don't think it will catch on. It would be a nightmare fo repair if damaged. Most of the Big Outboard manufacturers are now selling duo prop type motors. Contra rotating props are very efficient. Admittedly only on the very large motors but I feel it will not be long before we see duo props on smaller models. In the future maybe even two speed gearboxes. I changed to a stainless steel prop on the old Orkney and the performance and fuel efficiency gain was dramatic. Mikey B Jim 1 Quote Link to comment Share on other sites More sharing options...
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