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Prop Size 1987 F36
Posted: Wed Jul 06, 2016 12:21 pm
by 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?
Re: Prop Size 1987 F36
Posted: Wed Jul 06, 2016 1:02 pm
by prowlersfish
You will do better with 20x20 . Your boat is not as light as it used to be when it was new
Re: Prop Size 1987 F36
Posted: Wed Jul 06, 2016 1:09 pm
by 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?
Re: Prop Size 1987 F36
Posted: Wed Jul 06, 2016 8:58 pm
by 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 .
Re: Prop Size 1987 F36
Posted: Wed Jul 06, 2016 10:38 pm
by 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!
Re: Prop Size 1987 F36
Posted: Thu Jul 07, 2016 7:23 am
by maiello
Thanks for the advice I'll redo the props to 20x20 next year. Hopefully I can reach 4000
Re: Prop Size 1987 F36
Posted: Thu Jul 07, 2016 12:52 pm
by prowlersfish
WayWeGo wrote: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
Re: Prop Size 1987 F36
Posted: Fri Jul 08, 2016 9:47 am
by 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.