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Looking for prop explanation, not just answer
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<blockquote data-quote="DaleH" data-source="post: 424323" data-attributes="member: 15636"><p>That does work for some prop applications and the 4-blade prop I run on my 60hp has vented holes. They work like this ... at slower speeds they allow air to vent through the holes, so the prop slips and allows the wheel to spool up when applying throttle. At higher RPMs, the water pressure exceeds the air pressure, so the holes effectively close up.</p><p></p><p></p><p>... and you would be quite right! My buddy and I ran the same motors, but had different hulls (his 22' deep-V, mine 25' heavy mod-V hull) ... using the same recommended 4-blade SS Renegade prop w/ high cup and rake, it lifted his stern and ran flat out 'de ballz' as the French would say, while on my hull it raised the bow sooooooo much I seriously had to deploy my trim tabs, which killed my fuel efficiency (as I ran an instant readout fuel computer hooked into my Northstar GPS).</p><p> </p><p>I used to say<em> 'Rigging the right prop on a boat isn't rocket science ... it's more complicated than that!'</em></p></blockquote><p></p>
[QUOTE="DaleH, post: 424323, member: 15636"] That does work for some prop applications and the 4-blade prop I run on my 60hp has vented holes. They work like this ... at slower speeds they allow air to vent through the holes, so the prop slips and allows the wheel to spool up when applying throttle. At higher RPMs, the water pressure exceeds the air pressure, so the holes effectively close up. ... and you would be quite right! My buddy and I ran the same motors, but had different hulls (his 22' deep-V, mine 25' heavy mod-V hull) ... using the same recommended 4-blade SS Renegade prop w/ high cup and rake, it lifted his stern and ran flat out 'de ballz' as the French would say, while on my hull it raised the bow sooooooo much I seriously had to deploy my trim tabs, which killed my fuel efficiency (as I ran an instant readout fuel computer hooked into my Northstar GPS). I used to say[i] 'Rigging the right prop on a boat isn't rocket science ... it's more complicated than that!'[/i] [/QUOTE]
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Looking for prop explanation, not just answer
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