i just stumbled upon this site and looks like a wealth of information.
I built a little crab skiff during Covid, 21’ narrow and pretty light. Power is currently an Atomic 4 gas engine. It is a tunnel drive and turning a 12”- 3 blade cupped “indigo” prop, specifically designed for A4’s. I believe the prop was meant to allow the A4 to turn up and run at 1400 rpm.
the boat currently runs about 14knts wot but is used mostly at 2 to 7 knots which guessing is 500- 1000 rpm.
I can only go an inch bigger prop due to tunnel.
I guess my question is where does one start picking the components?
Can I expect any efficiency with existing prop?
thank you for any feedback
tom
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