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Discussion Starter #1
I bought a bass boat, the darn thing is all top end, either its wallowing in the surf like a big pig or its going 60mphs across the water, its looks like I need a 4 blade prop, with a lower pitch. My current prop is a 3 blade, 14 1/2 x 24, whats would be the logical prop/pitch to put on for better mid range and faster planning.
 

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Discussion Starter #2
FYI. The engine is a 150hp Johnson
 

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You want your max RPM at WOT to be 5400-5600. Each degree of pitch you go up generally takes you down 100 RPM at WOT. Each degree of pitch you go down generally takes you up 100 RPM at WOT.

Not sure you really need to get into a 4-blade unless you're pulling tubers or skiiers with your bass boat.
 

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Discussion Starter #4
I was thinking 4 blade after reading this

"3-blade or 4-blade Propeller?
Basically the difference between using a 3 blade or 4 blade propeller can be seen in the boat's handling and performance.
Three-blade propellers are the most popular and are good for general, all-purpose use. They provide good acceleration and control, and excellent top speed performance. Please note: Aluminum propellers are ONLY available in a 3 blade design.

The 4 blade design (stainless steel)is popular with boaters who are looking for a good hole shot, better acceleration, and better bow lift (higher trim angle) to reduce boat drag (too much of boat in water- reducing top end speed).
Important: 4 blade designs allow your boat to stay on plane at a lower rpm - Producing a slower cruising speed without loss of plane of the boat in rough seas and conditions.
Renegade props (4 blade) are of an excellent design -allowing better top end, speed, with minimal drag."
 

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I am running a different hull design than you, I am sure. Mine is a deeper V fiberglass hull.

I run a Johnson 115 and had a 17 pitch 3-blade which topped out at a nice 5400 RPM @ 41 mph. Since I was pulling kids on tubes at times I switched to a Solas Amita 17 pitch 4-blade prop (which is aluminum). I notice a LITTLE better holeshot, mayyyyybe a little better cornering and bow lift, but not much. And I have about a 4 mph decrease in top end speed. Was it worth it ??? Dunno. The prop was only around $100. So it's pretty much a toss up in this case.
 

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Discussion Starter #6
Ive found a 4blade stainless with a 21 pitch for 150, its brand new, I think Im going to buy it, see how it does, just have to watch the RPM at WTO. Id take a 15mph decrease if it would run at 10mph and not have to stand up to see whats in front of me.
 

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A 21 should bring you up 300 RPM at WOT, increase the power in your holeshot and reduce your time to plane.

If you have $150 to toss, go ahead and get the 21 pitch. You may want to take your boat back out and run it again as-is and see what your RPM is at WOT to get a more precise idea of where you need to be BEFORE yo start spending $$ though.
 

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don't know if you have a boat shop near you that would let you but the guy I deal with let me try out four different props till I found the right one . he just told me if I run one into the ground I bought it. I have a 19 ft nitro with a 150 found a four blade lost to much top end . and in many bass boats you are not going to be able to go 10 mph without the bow rising . what kind of boat are you running?
 

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Diameter also plays a role. For every 1 you go up you lose 400 rpm if my memory serves me correctly.

Not all props perform the same either a 14 1/2 from manufacturer A will not run the same as manufacturer B
 
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