3 vs 4 Blades Rule of Thumb

[Tempest38]

What would be the difference between the same size props in 3 blade vs 4 blade? THANKS!!!

[Griff]

About 200rpms less for the 4 blade. Probably more stern lift with the 4 blade. better planing and cruise speed with the 4 blade. Maybe a slight reduction in top end speed with the 4 blade.

Just general rule of thumb stuff. Results may vary slightly depending on what the boat likes.

[Tempest38]

It had 4 blades when I got it but they're at the bottom of the lake along with half a prop shaft etc. Might have to see if I can find some more or something along 25p. Seems it did better with 4 blades. Thanks G!

[BDM]

I think you just need to trade it on a 40 OL with triples, and call it good. :mrgreen: [smilie=crazy]

[Tempest38]

Deal! I'll trade Both my boats and maybe throw in a couple of sandrails and quads for the 40! Actually I've been advertising the BBT and if it sells I'm going bigger...

[Bajapit]

a 4 blade has 1 more blade than a 3.:confused:

[Tempest38]

I was gonna get my calculator fingers out and go out in the shop and try to figure that out this afternoon. Thanks [smilie=042.gif]

[BDM]

Where's it advertised at?? :confused:

[Tempest38]

http://www.racingjunk.com/post/1248148/Tempest-38-Offshore-Boat.html

Also - what is the rule of thumb for say a 3 blade vs cleavers?

[Cain8768]

http://www.racingjunk.com/post/1248148/Tempest-38-Offshore-Boat.html

Also - what is the rule of thumb for say a 3 blade vs cleavers?

$$$$$$:mrgreen:

[Bajapit]

I was gonna get my calculator fingers out and go out in the shop and try to figure that out this afternoon. Thanks [smilie=042.gif]

:mrgreen: Just trying to help.[smilie=crazy]

[cullen11]

My understanding is that anytime you add a blade, you get better holeshot, increased acceleration and better cruise at same rpm. That is what I got going from 4 to 5 blade, assume it is the same going from 3-4. Top end may or may not decrease depending on boat. Mine stayed the same.

[Griff]

http://www.racingjunk.com/post/1248148/Tempest-38-Offshore-Boat.html

Also - what is the rule of thumb for say a 3 blade vs cleavers?

Cleavers give very little bow lift and will tend to blow out easier than a round eared prop.

[Tempest38]

I don't need any more blowing out that's for sure. With OttoPeddler and LakeRat on board that's plenty.

[Bajapit]

Well Don, Were here for you , Any other questions, Just ask.. You know I got that 8th grade Education. Don't want to waste it...

[Lakerat]

I was gonna get my calculator fingers out and go out in the shop and try to figure that out this afternoon. Thanks [smilie=042.gif]

OK :roll: LoL

[Tempest38]

Thanks to CrownMan[smilie=042.gif] I got to try his 26p 4 blades yesterday at ElDorado. Boat popped on plane by far faster than it ever has but lost 1.4 mph. Gonna try some 25p 3 blades next time at the lake in a few weeks and see how the odd couple likes them.

[Bajapit]

T38. how about the new 5 Blade?

[Tempest38]

I can't count that high. And have to remember I still have the odd couple pushing me around... I'm guessing the 25's will do perfect... for fuel mileage...

[Baja Cruzin]

When you hit a big log with a 4 blade it will do more damage to the log

[Tempest38]

Yep. As long as you leave a good impression...

[Tempest38]

How do three blade cleavers compare to three blades if you don't need stern lift?