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Prop size gurus, I need some help, 3 blade to 4 blade
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<blockquote data-quote="Boat2fast" data-source="post: 349911" data-attributes="member: 13358"><p>Your middle set of numbers looks a little funny to me only because speed always changes with rpm. Your boat must be fairly light to achieve those speeds. Regular speedometers are OK but test data should be from a GPS. Make sure your tach is accurate too. Check it with another tach. Pole switch on the back can be set wrong for your engine.</p><p></p><p>There are a lot of really good prop options for that engine. Solas wouldn't be my first choice.</p><p></p><p>OMC props are usually the best bet. Trick is to find earlier ones that weren't outsourced. The ones I keep coming back to are the Raker series for fast boats. If four blades are a must, maybe try a Cyclone.</p><p></p><p>As far as pitch is concerned, you pretty-much know where you stand. Try to find a friendly dealer to borrow from and test. When you settle on a good prop, buy from that dealer. When you return a borrowed prop, make sure it's shiny clean. Tell the dealer exactly how it ran. Dealers can use this information.</p><p></p><p> If you have to buy and test, then you have to be pretty careful. Stainless props make pretty expensive garage ornaments. Some online forums can be helpful in swapping props. Check out Scream n Fly. Hot boats and props are familiar to most all who frequent there. There is a prop selling forum there too.</p></blockquote><p></p>
[QUOTE="Boat2fast, post: 349911, member: 13358"] Your middle set of numbers looks a little funny to me only because speed always changes with rpm. Your boat must be fairly light to achieve those speeds. Regular speedometers are OK but test data should be from a GPS. Make sure your tach is accurate too. Check it with another tach. Pole switch on the back can be set wrong for your engine. There are a lot of really good prop options for that engine. Solas wouldn't be my first choice. OMC props are usually the best bet. Trick is to find earlier ones that weren't outsourced. The ones I keep coming back to are the Raker series for fast boats. If four blades are a must, maybe try a Cyclone. As far as pitch is concerned, you pretty-much know where you stand. Try to find a friendly dealer to borrow from and test. When you settle on a good prop, buy from that dealer. When you return a borrowed prop, make sure it's shiny clean. Tell the dealer exactly how it ran. Dealers can use this information. If you have to buy and test, then you have to be pretty careful. Stainless props make pretty expensive garage ornaments. Some online forums can be helpful in swapping props. Check out Scream n Fly. Hot boats and props are familiar to most all who frequent there. There is a prop selling forum there too. [/QUOTE]
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Prop size gurus, I need some help, 3 blade to 4 blade
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