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Prop size gurus, I need some help, 3 blade to 4 blade
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<blockquote data-quote="muskiemike12" data-source="post: 349947" data-attributes="member: 4897"><p>That is good advise 2fast. Generally when you add a blade you want to drop your pitch by 1". You need to find accurate performance numbers before you start playing with props. </p><p> I had a 1995 Stratos with a hull weight of #1300. I had a Johnson 150 pushing that and I could go 62mph @5600 with a 24" Raker prop. </p><p> I suspect that your speed and rpm's are off. If I give you 6% prop slip your speed should be 48 with that prop and rpm's. </p><p>Generally 4 blade props have a better hole shot and are more efficient at cruising speeds. You will loose top end performance though, because of increased drag.</p><p></p><p>Answer these questions and maybe we can be of more help.</p><p></p><p>What style of hull and weight is your boat? How fast does your boat get on plane? What performance issues are you trying to correct?</p></blockquote><p></p>
[QUOTE="muskiemike12, post: 349947, member: 4897"] That is good advise 2fast. Generally when you add a blade you want to drop your pitch by 1". You need to find accurate performance numbers before you start playing with props. I had a 1995 Stratos with a hull weight of #1300. I had a Johnson 150 pushing that and I could go 62mph @5600 with a 24" Raker prop. I suspect that your speed and rpm's are off. If I give you 6% prop slip your speed should be 48 with that prop and rpm's. Generally 4 blade props have a better hole shot and are more efficient at cruising speeds. You will loose top end performance though, because of increased drag. Answer these questions and maybe we can be of more help. What style of hull and weight is your boat? How fast does your boat get on plane? What performance issues are you trying to correct? [/QUOTE]
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Prop size gurus, I need some help, 3 blade to 4 blade
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