Whaler Central - Boston Whaler Boat Information and Photos

Posted by ReelKaos on 06/07/17 - 1:57 PM

I bought a Yamaha F40 for my 1982 13ft whaler.(2C5202) It has been redone with a center console and ice chest seat. I have 10 1/4 x 14 pitch Yamaha aluminum prop that turns the motor 5100 rpm at about 31 mph. I want to get as close to 6000 rpm as I can using a SS propeller. Any ideas on what it would take? Am I looking at a stainless steel 10 1/2 x 12 or 13?

Thanks
Drew

Posted by Phil T on 06/07/17 - 2:27 PM

Aluminum props do not perform as well as stainless props.
Yamaha makes two decent stainless prop models. Painted and polished.

Don't be focused on size since it is not universal across models or brands. The blade design makes a huge difference.

I would start with a 10-1/2" x 12" Performance 3-Blade, Yamaha part # MAR-GYT3B-03-12.

Expect WOT to be ~6k and 32-34 mph running light and solo.

Posted by ReelKaos on 06/19/17 - 3:11 PM

Well, I bought a 10 1/4 x 12 Power Tech and get about the same performance. I gets about 2-3 hundred more RPM and about the same speed. ????????

Anyone have an 11" prop on a 13 footer?

Posted by Eddie M on 06/21/17 - 2:50 PM

Reel. I have a 1998 Anniversary 13' Classic #12 with a FI F 40. I use the Yamaha SS prop listed above and, I think I have a prior post with the performance numbers. The motor is mounted all the way down or lowest position. Depending on wind, current, sea condition and fuel condition I have inconsistently hit top speed of 36 mph at 5600 rpm's. That is with no load by myself. Makes for an uneasy ride. Consistantly the boat runs 5500 rpm's at 34 mph. The FI F40 Yamaha is making 40hp at 5500rpm's per the owners manual. Some motors make more power at the top of their recommended limit or up closer the rev limiter. You would find that out testing an 11" prop. Please post the information if you get the opportunity to test one. I will do the same. Thank you, Ed.

Posted by megawatts on 06/26/17 - 1:18 PM

I have a 1991 13 ft with a 1993 yammie 40 hp and a 10x15 alum. seems to wind up. currently testing with gps and installing a tach to get real numbers my boat is dry also aprox. 360 lbs with motor at 165lbs

(corrected abbreviated year to full 4 digit year per guideline #1 at the top of this page)

Edited by Joe Kriz on 07/07/17 - 6:11 PM

Posted by megawatts on 07/07/17 - 5:56 PM

just ran the 13 me and 6 gal. gas under the front seat motor set to even of bottom of boat. gps 35 mph no tach as yet. spinning a 10x 15 alum prop. what can I do to make it faster?? thanks

Posted by Phil T on 07/08/17 - 5:17 AM

If you don't have a tach, you need to correct this before proceeding.

If we don't know the WOT rpm's, we can't tell what adjustment in size is appropriate.