Grinna 2 Posted March 22, 2012 Share Posted March 22, 2012 Whitings are the agents for Gori props and don't sell anythign else when it comes to props. I wouldn't expect that they'd necessarily be independent when it comes to propellor advice. Henleys are propellor specialists. They're also agents for Flex-o-fold props. You're more likely to get a more rounded and potentially more idependent opinion (certainly more experienced opinion) on propellors from Henleys than you'd get from Whitings. Link to post Share on other sites
Fogg 427 Posted March 22, 2012 Author Share Posted March 22, 2012 Cool, thanks. Link to post Share on other sites
Guest Posted March 22, 2012 Share Posted March 22, 2012 I agree with grinna re getting Henley's advice. Prop design has not really evolved a hell of a lot over the last 100 years but has been refined somewhat and a prop specialist is the right person to talk to. As far as maintaining speed in a "decent seaway", vessel displacement combined with horsepower is the only way of improving things. Make the boat heavier or throw more power at it. Either option not particularly attractive in terms of comfort, cost and performance in a sailboat. Link to post Share on other sites
wheels 543 Posted March 22, 2012 Share Posted March 22, 2012 Although in saying weight helps, in a continuous heavey sea, it doesn't really. A wave or two from a big wake has no affect on my boat. But 35kts on the nose and a heavy sea will drop the speed of my boat to 3kts and in one situation I had just 1.5kts and I have 130Hp and a 23" prop pushing a 26tonne boat. Link to post Share on other sites
Guest Posted March 22, 2012 Share Posted March 22, 2012 Not enough neddies for your size is the answer. You need more horsepower to drive that displacement. Next step is a power boat. Link to post Share on other sites
wheels 543 Posted March 22, 2012 Share Posted March 22, 2012 More Power?? ey ey capp'n. More Power!!!! Link to post Share on other sites
marinheiro 352 Posted March 23, 2012 Share Posted March 23, 2012 I would not write off the Kiwi Prop without further investigation - it is certainly best bang for the buck as far as prop upgrades go (price for a Gori especially will make your eyes water), and being able to adjust the pitch means you can get a spot on match to the engine. Every different type of feathering prop needs occasional maintenance, but this has not stopped literally 1000's of max prop installations. I know of a big Given cat with 2 Kiwi props and no problems at all with them. Link to post Share on other sites
rigger 47 Posted March 23, 2012 Share Posted March 23, 2012 Although in saying weight helps, in a continuous heavey sea, it doesn't really. A wave or two from a big wake has no affect on my boat. But 35kts on the nose and a heavy sea will drop the speed of my boat to 3kts and in one situation I had just 1.5kts and I have 130Hp and a 23" prop pushing a 26tonne boat. on a 90m LOA ship we were doing 10knots - bowed into one wave and we were going backwards at 3knots - it was a big wave..... Link to post Share on other sites
Fogg 427 Posted March 29, 2012 Author Share Posted March 29, 2012 Anyone got experience of Brunton Autoprops? Link to post Share on other sites
Jon 360 Posted March 29, 2012 Share Posted March 29, 2012 AC we have a Volvo D2-40 in a slightly larger boat that AC, It will not push it onto the plane but what we find is motoring home into crap we need to increase revs from 2100 to 2300 to maintain 7.5 kts with boats going backwards beside us. If your engine is in good condition I would look at reproping, But keep in mind the ability to put the new prop on a larger motor in the future as you will possibly get a new 40 about the same weight as your old one. We kept our old 2 blade when we repower as the new prop made my eyes water, but one day I will either have to rebuild it or replace it Probably replace as the improvement in performance is reportedly worth it. Link to post Share on other sites
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