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Posts: 292
| im running a 60 4 stroke and have a 10 5/8 x12 on my boat and wanted to know what a 10 1/4 x14 would do? |
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Posts: 3508
Location: Elk River, Minnesota | Hiya,
It would lower your rpms roughly 300 and maybe increase your speed by 1 to 2 mph. It may lower it even more depending on where your motor's rpms are at when you are at full throttle and lightly loaded.
The hole shot of the rig if you punch it will be slower, and again depending on how your current prop is performing, you may find you cannot trim up as much as the motor cannot reach a high enough rpm level to trim the bow up without ventilating or porpoising.
In a nutshell, you gain speed, but you lose low end power as the motor is working harder to turn the prop. Depending on the prop, though, there might be other things that can be done to the rig itself to get the performance even better.
Do you have an idea of the max rpms the motor is turning and what speed you are seeing via gps?
Steve
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Posts: 292
| thank you for your reply,i just got this boat in the water once so im not 100% sure .but my rpm was close to 6000 max and i think my speed was 35 to 38 gps |
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Posts: 3508
Location: Elk River, Minnesota | Hi again,
What brand of motor?
Steve |
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Posts: 292
| Yamaha f60 |
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Posts: 3508
Location: Elk River, Minnesota | Hiya,
I believe 6000 rpms is the max for that motor. If you go to a 14, you might still be o.k, but expect to see a drop in 300 or so rpms, which when lightly loaded would be too much for the motor when you get another passenger and gear.
If you can find one to try, the only way to know is to try it out. Worth it to try...at least in my mind (the outboard "motorhead"). 
Steve |
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Posts: 292
| Thanks for the advise
Chris |
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Location: 225 W 25th St, New York, NY 10001 | All the suggestions and questions are very helpful for me.  You can also see Marine Engine Parts for more information.
Edited by DanielEvans 7/17/2012 12:45 AM
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prop question