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Off Topic Discussion
Marine Propeller
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<blockquote data-quote="Kevin Palmer" data-source="post: 868002" data-attributes="member: 54263"><p>Gerry, not sure if you know what the actual markings mean, if so, sorry in advance if I am insulting your intelligence..</p><p></p><p></p><p></p><p>A prop of 12 1/4 X 15 means that it is 12 and 1/4 inches in diameter and would travel 15 inches if you were to thread it into a block of wood for example. Obviously, it slips in water, but if you could thread it into a sold item such as wood or jello for example, the prop would move 15 inches after one complete revolution.</p><p></p><p></p><p></p><p>So, when we look at the 11 1/4 X 17, we are going down 1 inch in diameter but we have a steeper pitch creating it to travel 17 inches.</p><p></p><p></p><p></p><p>All in all, I believe the increased load of the pitch would make a minimal change over all to the engine RPM's.</p><p></p><p></p><p></p><p>I say this as the first prop has increased water resistance due to the diameter with a slightly less water resistance relative to the pitch. Looking at the 2nd prop, we loose resistance in diameter but gain it in the pitch.</p><p></p><p></p><p></p><p>Follow me????</p></blockquote><p></p>
[QUOTE="Kevin Palmer, post: 868002, member: 54263"] Gerry, not sure if you know what the actual markings mean, if so, sorry in advance if I am insulting your intelligence.. A prop of 12 1/4 X 15 means that it is 12 and 1/4 inches in diameter and would travel 15 inches if you were to thread it into a block of wood for example. Obviously, it slips in water, but if you could thread it into a sold item such as wood or jello for example, the prop would move 15 inches after one complete revolution. So, when we look at the 11 1/4 X 17, we are going down 1 inch in diameter but we have a steeper pitch creating it to travel 17 inches. All in all, I believe the increased load of the pitch would make a minimal change over all to the engine RPM's. I say this as the first prop has increased water resistance due to the diameter with a slightly less water resistance relative to the pitch. Looking at the 2nd prop, we loose resistance in diameter but gain it in the pitch. Follow me???? [/QUOTE]
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Off Topic Discussion
Marine Propeller
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