Prop Size 1987 F36

[maiello]

I have a 87 F36 twin 454 crusaders. Looking to get some intel on what others are running for props. Called Bob, he said the boat calls for 20x21 no cup, which is what I have. I can only get 3700 max RPM. Boat planes at about 2600 and I cruise at about 2800 and do about 16 knots at that RPM, if I push to 3000 I'm doing about 20 knots. I'm happy with this lower RPM and speed, but just wondering why I can't get to 4000. I have new carbs and engines run very smooth.

Any success with a different prop size? Do other F36's with crusaders run like mine?

[prowlersfish]

You will do better with 20x20 . Your boat is not as light as it used to be when it was new

[maiello]

Thanks for the reply. I'm not sure what you mean but it's not as light when it was new? Enlighten me. You think my fuel consumption will go down too?

[prowlersfish]

Gear ,toys, fishing gear, water absorption it all adds up . I doubt you will see any loss of mpg . And it will make life easier on the engines .


From what I have seen most boats leave the factory propped to the limit or slightly over propped .

[WayWeGo]

FWIW, we are running 18.5x19 no cup and barely get to max RPM at the beginning of the season. I really need to put the boat on a diet and get some of the junk off it!

[maiello]

Thanks for the advice I'll redo the props to 20x20 next year. Hopefully I can reach 4000

[prowlersfish]

FWIW, we are running 18.5x19 no cup and barely get to max RPM at the beginning of the season. I really need to put the boat on a diet and get some of the junk off it!

That seems on the small size for props . But it is what it is

[larryeddington]

My tri cabin weighed 16000 lbs with 200 gals of gas and half full water tank when I pulled it from water to clean bottom. Have not really filled boat with all the other goodies. My best speed is 25 mph and I have 20x17 at 3600 to 3800 rpm. Will post a picture tomorrow on other computer.