24
Dec
Gheenoe classic is best for 3 blades propeller and a high speed boat due to kinda like a vee hull. 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.
The tempest plus comes to mind.
4 blade vs 3 blade prop. One of the main reasons people seem to choose 4 blade propellers over 3 blade propellers is the benefits afforded by the increased blade area given by the extra blade. This extra blade area provides increased water displacement capability greater lift and better grip than the 3 blade propeller counterparts. 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 a lower speed.
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. 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. Most of the time when you decrease 3-blade prop slip by at least 10 you can improve top end speed. So the 4 th blade can provide increased water displacement capability lift and grip as compared to the comparable 3-blade propeller.
In terms of actual boat performance the 4-blade can enhance handling hole shot low-speed planning ability cruise. Testing 3 Blade vs 4 Blade Propellers Whats the Difference Between 3 and 4 Blade Outboard Props - YouTube. I have used both a 3 blade and a 4 blade on my pontoon boat.
The 4 blade will definitely hold the water and be more responsive. Fuel mileage is usually a little better and you can usually run the motor a hole or so higher. The 3 blades I have run tend to offer more top speed seems to plane in about the same time.
Theoretically a 3-blade propeller should always be more efficient than a 4-blade. However in the past two big issues have prevented the 3-blade from taking the lead in popularity. The first was a lack of manufacturing precision which commonly caused 3.
I have the Bravo 3 XR with the front 4 blade and rear 3 blade have to say I can get up on it like i have twice the HP but not the greatest for top speed. I am trying to find a set of 25p XR props 43 to try before I go to that size to get a little more top end. 3 blades creating more lift than 4 blades or vise versa is 100 BS.
A 3 blade cleaver will produce MUCH more stern lift than a 4 blade chopper. Likewise a 4 blade cleaver will produce more stern lift than a 3 blade chopper. A good prop guy can make a 3 blade do anything you want it to do.
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. When moving from a 3 blade 16 X 215P to a 4 blade prop WE SHOULD HAVE selected the 4 blade 1525 X 22P in the first place as the 75 reduction in diameter had a dramatic effect on WOT RPM.
At 500 and up there isnt much room for economical trial-and-error testing when you try new props in this size range. 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 a lower speed. Or their OFS series in 3 or 4 blade.
Give them a call probably have propped your boat model in the past. Prop pitch select for minimum 5500 rpms WOT max load aboard or 5900 rpms WOT light load. Leaves more top end power went you have to hammer down in the rough big ones to hold on backside or climb over top.
Testing at Sea wen fully Loaded 3 Blade vs 4 Blade Propellers Whats the Difference on RPM variation - YouTube. I much prefer 4 blades on my props despite tuning for speed the smoothness and grip is substantial. Mu ultimate go to prop thats always achieved the best speed and rpm range on the last 3 boats is a merc rev4.
But swapping props is expensive. I always drop a pitch when swapping from a 3 to 4 blader also but its my own therory and might. 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. A four blade prop slips less than a 3 blade prop so youll get out of the hole faster and usually cruise a bit fastermore economically However you usually lose a bit on the top end. A four bladed prop will also hold better in rough water and tight turns - less cavitation.
I went with 4 bladed Power-tecs and theyre great but I was greatly.