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Author Topic:   13-footer with 40-HP

csj posted 07-10-2014 09:39 PM ET (US)
Folks--please assist me with the correct propeller I should use with a 1969 13-footer and a 1984 40-HP Mariner. We are changing motors from a 25-HP to a 40-HP--the kids getting older and bigger. The motor has a aluminum 14-pitch propeller
padrefigure posted 07-10-2014 10:52 PM ET (US)
That should be very close. I have a 10 X 13 with a 35-HP and seem to be getting good performance.
skred posted 07-11-2014 07:56 PM ET (US)
My 1987 13-footer with a 1981 Johnson 35 is running a 10 x 15-pitch Michigan aluminum prop. Just did the shakedown yesterday, and with the motor set "on" the transom (clamped resting on the transom), and motor angle set in the middle of the holes, I easily reached 30-MPH with my 250-lbs, 6-gallon tank, and battery. The dealer said the 15 inch pitch would be a bit better performer. Not sure I need any more speed with a 330-lb-boat.
csj posted 07-17-2014 09:46 PM ET (US)
Folks, I'm running a 10 3/8 x 14 to start off with but I have another concern. The mariner 40 hp does not have t/t and with the motor set on the last hole ref the pin or the outer most hole, the boat at high speeds really pushes the bow down. With that said it's rather scary with no bow lift at all. I'm aware this is due to the slopping inward style transom on a 69 13'. Anyone come up with a solution and no t/t is not in the budget :) ??
dg22 posted 07-18-2014 09:26 AM ET (US)
My motor, a 1973 50-HP Evinrude, does not have power trim either so I run it on the 2nd highest tilt pin position on my 1967 13-footer. At this tilt position, the cavitation plate of the motor is approximately level with the bottom of the boat. I find this tilt position works best for overall performance.

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Author	Topic: 13-footer with 40-HP
csj	posted 07-10-2014 09:39 PM ET (US) Folks--please assist me with the correct propeller I should use with a 1969 13-footer and a 1984 40-HP Mariner. We are changing motors from a 25-HP to a 40-HP--the kids getting older and bigger. The motor has a aluminum 14-pitch propeller
padrefigure	posted 07-10-2014 10:52 PM ET (US) That should be very close. I have a 10 X 13 with a 35-HP and seem to be getting good performance.
skred	posted 07-11-2014 07:56 PM ET (US) My 1987 13-footer with a 1981 Johnson 35 is running a 10 x 15-pitch Michigan aluminum prop. Just did the shakedown yesterday, and with the motor set "on" the transom (clamped resting on the transom), and motor angle set in the middle of the holes, I easily reached 30-MPH with my 250-lbs, 6-gallon tank, and battery. The dealer said the 15 inch pitch would be a bit better performer. Not sure I need any more speed with a 330-lb-boat.
csj	posted 07-17-2014 09:46 PM ET (US) Folks, I'm running a 10 3/8 x 14 to start off with but I have another concern. The mariner 40 hp does not have t/t and with the motor set on the last hole ref the pin or the outer most hole, the boat at high speeds really pushes the bow down. With that said it's rather scary with no bow lift at all. I'm aware this is due to the slopping inward style transom on a 69 13'. Anyone come up with a solution and no t/t is not in the budget :) ??
dg22	posted 07-18-2014 09:26 AM ET (US) My motor, a 1973 50-HP Evinrude, does not have power trim either so I run it on the 2nd highest tilt pin position on my 1967 13-footer. At this tilt position, the cavitation plate of the motor is approximately level with the bottom of the boat. I find this tilt position works best for overall performance.
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