Propeller advice

[Scott Danforth]

The OP stated that he can get 4800 with a 19P prop, and above that RPM he ventilates. Redline is 4600, right? I think he should try a 21P prop.

he stated he is spinning an unknown quality amazon prop at that RPM and that it "absolutely jumps on plane". I suspect that the Amazon prop is maybe 17-18ish on the pitch as the blades flex

The redline on the motor is 4800 RPM carbed and higher with EFI (same longblock). I know with a true 19p stainless prop on the exact same 5.0/Alpha in a 3600# wet weight 19' searay will spin 4950 RPM on the dash ( 4825 RPM on the digtal diagnostic tach ) at 51mph on the dash (49.8mph GPS) with a single person trimmed out on dead calm water. Add a second person and the RPM and speed dropped.

the OP's196 Bryant for 2000 has a dry weight of 3075 and the same size fuel tank, so the wet weight will be really really close to the 3600#

Im willing to bet if the OP gets a true 21p stainless, he wont be above 4400 RPM. a 21p aluminum, maybe.

 

[jimmbo]

Blade Flex, 2 words that have sold tens of thousands of SS Props. If the Blades of an Aluminium Prop Flex, it would be in the Hundreds of an Inch.