1. ## 3 blade vs 4 blade. who can break it down for me

2. X2^^^ i've wondered the samething... someone shed some light on this topic please...

3. And I would like to know is three blade 15/21 equal with four blade 15/21?

4. From my understanding: a 4 blade you can only bend so much before you can't anymore and will usually be faster with the same pitch. The 3 blade you can get better acceleration and be able to bend it a little more then a 4 blade and that's where the 3 blade is "faster".

5. Originally Posted by JayErola
And I would like to know is three blade 15/21 equal with four blade 15/21?
The 4 blade should have a little more top speed but the 3 blade should have better acceleration having the same pitch.

6. Originally Posted by ImAShark
The 4 blade should have a little more top speed but the 3 blade should have better acceleration having the same pitch.

7. what applies to a boat (out board prop) does not apply to our pumps.
Most yield higher top end with 4 blade at same rpm with our pumps.
You should gain more top end when add enough power with the 3 blade to run that same 9,200 rpm.
I bet speed would be similar but at the same time with that extra power you would be on limiter with the same pitch on 4 blade so in theory you could add more pitch to 4 blade and gain more speed.

I think there are some threads on this topic and why somewhere????

8. Originally Posted by blackvr
You are making sense. It takes more power to turn the 3 blade. If you have a 15/21 3 blade turning 8800 it will be faster than a 4 blade 15/21 at 8800. Thing is that the motor turning 8800 with the four blade would not be able to turn the three abviously. I think once you are making 400+ horsepower the 3 blades would be the way to go,

9. who here has ever used a tap for threading a hole? for every revolution, the more blades/flutes you have, the less cutting is done per blade/flute. less cutting done per blade/flute = less force required to cut the material. same principle for the props. more blades = less water cutting per blade = less power required. as for which is faster, well i would think that resistance plays a role in it too. more blades = more resistance, so if your motor has the power to spin a fewer number of blades, it should be faster. that's my backwoods logic on the subject, so it might not actually be the reality of the situation. it's just what makes sense in my head, lol.

10. Originally Posted by got wake?
who here has ever used a tap for threading a hole? for every revolution, the more blades/flutes you have, the less cutting is done per blade/flute. less cutting done per blade/flute = less force required to cut the material. same principle for the props. more blades = less water cutting per blade = less power required. as for which is faster, well i would think that resistance plays a role in it too. more blades = more resistance, so if your motor has the power to spin a fewer number of blades, it should be faster. that's my backwoods logic on the subject, so it might not actually be the reality of the situation. it's just what makes sense in my head, lol.
3 blades shine on the bottom end and the 4 blades shine on the top-- each has to be pitched for optimal results. If you are doing speed runs or just high speed cruising you will most likely prefer the solas 4 blades. I have a few of each, but I plan on keeping the 3 blade in most of the time for my riding style and adding more boost and fuel to get the top speed that I like.