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Considering a stainless prop for my 1984 Mariner 20hp
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<blockquote data-quote="onthewater102" data-source="post: 384768" data-attributes="member: 13702"><p>That's the prop. selector I was using too...I'm not sure how exact it is for my application (2002 alumacraft 1436LT / 20HP 1984/85 Mariner 20hp) as I've shifted the seating position forward ~5" from the front edge of the rear bench and converted it to side console steering, so the weight is carried a bit forward on the flat bottom portion of the boat. For my 1436 it was recommending a 10.5-13 but if I plug a 1448 in it recommended a 10.125-14 so I'm thinking that prop is safe on my motor. I'm going to see where I'm at with RPMs before buying this, but if I'm running on the fast side now I can get all the way to a 10.125-15 I think I could get the speed I'm looking for. If there is efficiency to be gained in the same prop size by switching to stainless I think I can definitely get to 25mph with a guest, which would be awesome.</p><p></p><p>The more I think about it the more I realize I need a tach to know exactly where I'm at right now with my RPMs at WOT with the load of 2 people in the boat. If it's bogging the RPMs down then perhaps a shorter pitch will get the RPMs up and close the difference between my 21 and 26 MPH observations.</p></blockquote><p></p>
[QUOTE="onthewater102, post: 384768, member: 13702"] That's the prop. selector I was using too...I'm not sure how exact it is for my application (2002 alumacraft 1436LT / 20HP 1984/85 Mariner 20hp) as I've shifted the seating position forward ~5" from the front edge of the rear bench and converted it to side console steering, so the weight is carried a bit forward on the flat bottom portion of the boat. For my 1436 it was recommending a 10.5-13 but if I plug a 1448 in it recommended a 10.125-14 so I'm thinking that prop is safe on my motor. I'm going to see where I'm at with RPMs before buying this, but if I'm running on the fast side now I can get all the way to a 10.125-15 I think I could get the speed I'm looking for. If there is efficiency to be gained in the same prop size by switching to stainless I think I can definitely get to 25mph with a guest, which would be awesome. The more I think about it the more I realize I need a tach to know exactly where I'm at right now with my RPMs at WOT with the load of 2 people in the boat. If it's bogging the RPMs down then perhaps a shorter pitch will get the RPMs up and close the difference between my 21 and 26 MPH observations. [/QUOTE]
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Considering a stainless prop for my 1984 Mariner 20hp
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