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Oct
However the 3 blade prop has less surface area which offers less drag and more top speed than the 4 blade prop. Looking for more performance from your boat.
My 3 and 4 blade prop are the stock OJ recommended for the CP.
3 blade vs 4 blade props. Three Blade vs 4 Blade Propellers and Load Carrying Due to the greater increased blade area of the 4 blade propellers and the increased grip on the water that this provides a 4 blade propeller will often perform better than 3 blade propellers when carrying heavy loads or. The difference between a 3-blade prop vs a 4-blade prop is that the 3-blade smaller blade ratio is faster with a higher top speed and the 4-blade higher blade ratio has a better hole-shot acceleration and better stern lift as well as better handling and fuel economy because it will keep you on plane at. The short answer is the 4 blade propeller has more surface area and bite which allows a boat to get up on a plane and maintain it easier at a lower RPM.
However the 3 blade prop has less surface area which offers less drag and more top speed than the 4 blade prop. Three-blade props offer a nice compromise when it comes acceleration efficiency lift and speed. A four-blade propeller on the other hand can boost acceleration efficiency or lift but at the cost of a lower top speed.
Jim Hendricks Sport Fishing. 3 Blade vs 4 Blade Propellers Whats the Difference Between 3 and 4 Blade Outboard Props - YouTube. Generally yes a 4- blade will be less efficient than a 3-blade for the simple reason that the leading edge of the prop loses efficiency as it encounters the disturbed water left by the blade in front of it.
Typically a 3-bladed prop will have more space between the blades to reduce that effect. Suggest looking at PowerTech props. PTC 3 blade if your a small wave no large rollers E.
Lots of blade rake and tip cupping for bow lift. PTC4 for heavy seas large swells and river tidal rip channels. Pac NW and rough offshore Alaskan water.
More grip and bow lift. Cant really add much to the above excellent advice other than that there are 3 blades out there that are that good they almost border into the ability of a 4 blade without losing all the upsides of a 3 blade. The tempest plus comes to mind.
4 blades in my opinion are now usually only required on extreme applications. Testing 3 Blade vs 4 Blade Propellers Whats the Difference Between 3 and 4 Blade Outboard Props - YouTube. Most of the time when you decrease 3-blade prop slip by at least 10 you can improve top end speed.
So the 4th blade can provide increased water displacement capability lift and grip as compared to the comparable 3-blade propeller. Forget about the 4 blades prop. Get a 3 blades prop 10x14 pitch.
2 more inch pitch will lost 400 rpm but more top speed. 4 blades prop is best suited for gladesman 18 due to flatbottom hull and will run shallower than gheenoe classic. Gheenoe classic is best for 3 blades propeller and a high speed boat due to kinda like a vee hull.
Uh I would seriously recommend a 3 blade prop. I run a 2005 2575 RL IO see specs below and two years ago I fooled around with several different props and I posted all the data on this site and the one 4 blade prop I did try was horrible. Top speed would go to the 3 blade and so would fuel efficiency numbers my guess.
If you were pulling someone off a grounding incident the 4 blade would be better with more control and torque to the water. I think fuel efficiency for cruising and what not would end up on the 3 blade column though. In general the 3-blade propeller will have a smaller diameter than the 2-blade propeller that it replaces which also serves to reduce the tip speed and noise.
In a twin-engine aircraft the reduced diameter of the 3-blade propeller will result in less tip-generated noise and a greater clearance between the blade tip and the fuselage. Jon tries three different Mercury propellers on an outbo. Looking for more performance from your boat.
One of the best places to start is with your propeller. 4 blade prop on 15 hp. Im not sure about your boatmotor setup but with the rigs that I work with the smaller the pitch the bigger the load I can pushThe bigger the pitch the faster I can go4 bladers seem to give us better performance all round fuel consumption and thrustCant help with.
Heavier slower boats eg. Displacement hulls do better with a 4-blade or more prop. A 3-blade will allow the engine to spin up a little higher on take-off because of the lower drag but the initial acceleration wont be as good as with the 4-blade due to the lower blade surface area.
A four blade gives better holeshot much better in cornering and the top end loss is negligible. At least on my 115 4 stroke. Also I can run my motor higher in the water column with a 4 or 5 blade prop which actually gives me more top end as I dont get slippage and cavitation like I do with my 3 blade props.
My 3 and 4 blade prop are the stock OJ recommended for the CP. Machined props over forged and stainless IMO. Pitch and blade number is more closely related to a specific condition that youre looking for.
Check out this 3-Blade vs. After swapping engines I was curious whether or not changing my prop would further increase the performance of my new motors.