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#1
11-24-2021, 11:13 AM
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Great info. Thanks. My friend has a set of 19’s and a set of 21’s. We were going to take it out and try both props to get a feel of what it needs. These are merc enertia I think. I know that they are not 4 blades. I will post results when we try them.
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#2
11-27-2021, 10:49 PM
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Don't over prop the boat. The old saying is to "Prop for Max of Max at Max"
You should prop to be able to plane easily and achieve the maximum end of the maximum rpm rating at maximum loading. If you prop for light to light-moderate loading, someday when you're at max loading and you need the immediately available torque you may not only be gravely disappointed, you may be in dangerous trouble. Prop for safe handling in storm conditions at max loading PLUS the weight of a deck with water coming over the back, bow or sides. I can honestly say that my choosing to prop this way once likely saved my life and the lives of my whole family. In 2005, I had my 20' Seafari, with a Mercury XR4, caught in 35-40 knot winds and 6-9' seas 20+ miles off the coast of Cedar Key. The front came much faster/sooner than was forecast the day before and I made the mistake of not re-checking the weather before heading out. I was turning a Powertech 15x16.5 OFS prop, even though I could easily swing an 18" Mirage. Shoot, if I was lightly loaded I could even swing a 14.75x21" and still hit the bottom of my max rpm range. But with that 16.5" prop. I could still hit 6000 rpms at max loading. I NEEDED that available applied torque that day. Prop for Max of Max at Max.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft  (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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