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I have a 2015 18.5 thunder jet boat with a Yamaha F150XB…

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I have a 2015...

I have a 2015 18.5 thunder jet boat with a Yamaha F150XB motor. the prop is a 19 - M 13.75. When crossing the Columbia river with five or six people in the boat there is times I would like a little more power planning out. what prop would help solve that problem/

Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Marine Mechanic should be aware of?

I don't think so.

Submitted: 10 days ago.Category: Boat
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Answered in 2 hours by:
7/11/2018
Marine Mechanic: Jason, Marine Mechanic replied 10 days ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,881
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Good morning, my name is ***** ***** am I speaking with? I read what you wrote. I have to run some prop calculation software. Do you happen to know what your engine RPMS are with the boat at full speed?

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Customer reply replied 10 days ago
No but i will be going out again in a couple weeks i could tell you then.
Marine Mechanic: Jason, Marine Mechanic replied 10 days ago

That really would be best. The prop calculation software lets me pick props one of 3 ways. By overall boat length, by overall boat weight, or by entering in the current top speed engine RPMS. If I do it by length the accuracy is 80%, by weight it's 90%, by RPMS 100%. So it's always best to do it by RPMS.

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