07
Dec
A lot of people like the 3 blade prop for racing the SVs speed is not the only thing a prop does and different props work differently in different water Ive used a 4472 at home and gone other places with the same exact boat and used a 4503 with almost the same results. Ill assume you have a MotorGuide motor.
A lot of people like the 3 blade prop for racing the SVs speed is not the only thing a prop does and different props work differently in different water Ive used a 4472 at home and gone other places with the same exact boat and used a 4503 with almost the same results.
2 blade vs 3 blade propeller boat. 2 vs 3 blade props. Each blade flies in the wake of the preceding blade While a three blade is slightly less efficient than a two blade prop it has nothing to do with the above. This is because the blade.
Doesnt fly in the wake of the preceding blade. By the time the next. With more area and less pitch the prop is more suitable to drive heavier boats than the two blade.
A two blade prop also usually gives a bit more vibration than a three blade. IN THE OLD DAYS and on larger engines the two blade prop was used in racing applications because each blade is slightly more efficient than each blade of a three blade prop—theoretically. As a two blade will have less drag than a 3 blade while not much more drag there is more drag in your mind and you will use it as an excuse as to why the boat is going slow.
Three Blade If you use your boat for cruising or if you have to power in to a current every time you go out a 3 or 4 blade is the better choice. When you say that you dont notice the difference have you sailed a 335 that had a two blade prop or sailed your boat with its three blade propeller near a boat with a two blade prop. The difference between using a two blade vs a three blade shows up primarily in low windspeeds when it might make the difference in whether you can sail or not and at high.
3-blade prop carries 33 less load than a 2-blade prop of same total area. It was found that this was a real advantage to propeller design. The reduced load on each blade allows the propeller designer to make the blades thinner and lighter which is more efficient while still being strong enough to carry the required load.
It is far more complex than that. The fastest RC boat in the world ran a three-bladed prop. More oval race-winning boats run 2-blades.
A three-blade has more blade area for the same diameter so you can run a smaller diameter 3-blade for the same amount of thrust. Smaller diameter means less prop torque reaction sometimes less prop walk. As already stated the optimum 2 blade prop will be slightly greater diameter and slightly more efficient than the optimum 3 blader to do the same job.
However blade number choice is down to other factors eg. Its not just the blade youre talking about a plastic vs a metal prop. A lot of people like the 3 blade prop for racing the SVs speed is not the only thing a prop does and different props work differently in different water Ive used a 4472 at home and gone other places with the same exact boat and used a 4503 with almost the same results.
Theres a lot of different. 2 blade or 3 blade prop. Only way to know is to run it.
2 is pro grada more efficient but 3 has better thrust. If you have a light fast hull to put it on like I had a 10 Lowe Lake John for my 7 12 and with just me which is all I ran a 2 blade did just fine. I would guess that a 2 blade prop is adequate.
You might find smoother operation with 3 blade but 2 blades are more efficient - better application of power. I assume that cost may be a consideration so 2 blade is more economical especially if considering a folding prop. Id check with your nearest Volvo penta dealer for selection.
On the right we have the two blade prop 10x47 vs the 3 blade prop 10x5 on the le. Ladies and Gentlemen the results are in. Which propeller has more thrust.
A 2-blade propeller produces two pressure pulses per revolution whereas a 3-blade propeller will produce three smaller pulses per revolution for the same amount of total thrust. As a result the 3-blade prop will be inherently smoother and therefore quieter. When comparing a 2 blade to a 3 blade it should be the same blade style and size width diameter etc otherwise you would be comparing apples to oranges.
Ultimately it boils down to getting the propeller that will have the optimum blade angle for your engines power. I have both 2 and 3 blade plastic props for a 45lb MG Wireless. From memory on high the gps speed diff was about 02mph on my boat.
I use the 3 blade weedless only on waters where it will be needed. Weedless actually means less weeds than 2 blade. The 3 blade is a latter version of MG machette that has the a taper to the hub post blades.
The boat came with a 15x10 3-blade prop installed fixed prop. It also came with a 2-blade prop also looks to have 15x10 stamped on it. I like the performance of the 3-blade but would like to try the 2-blade to see how much it reduces drag.
The real trade-off is at the high end of the RPM scale when you try to get your boat to go at its fastest speeds. At the higher end of the RPM scale the 3 blade propeller will almost always outperform the 4 blade propeller so you can expect to lose about 5 of the top speed with a 4 blade propeller. For noise reduction getting the prop tip speed down is critical.
Obviously a longer 2-blade prop has a higher tip speed than a shorter 3-blade prop at the same RPM and that means less noise at higher RPMS. Trolling motor prop- 2 blade vs 3 blade. 2 bladed TM props usually give you better thrust and open water performance.
3 blade types like Ninjas are supposed to be better in the weeds. Ill assume you have a MotorGuide motor. I didnt like the Ninja when I had my Motorguide but to each his own.
Someone askd about 2 vs 3 blade props on the same boat. My 28 S2 came with the original yanmar 1gm engine with 65 hp not the bigger 1 gm10 of today and it was just too small with a 2 blade and wouldnt get to hull spd in calm water. I replaced it with a 3 blade for cruising and it made a big.
From a prop to prop comparison. Machette III vs Powerprop - Each single blade on the Powerprop has less area than each on the Machette III - So Machette III wins for total surface area hands down - Powerprop has about 1 larger overall diameter 12 per blade Measured shaft to tip - Pitch looks the same or the Machette III has slightly more. As for 2 blade vs.
3 blade V or direct drive theres tons of info out there that will satisfy your question. Very basically a 3 blade is smoother provides a bit better low speed manuverability and has a better pull on the low end but falls off on the big end. Personally the big end is my favorite.
Hope it helps _____ Free Amateur Videos. Use the three blade. Its better then the two in weeds and not quite as good as the four but the four blade one gives up too much thrust.
On a windy day you wont be able to fight it. In my experience with motorguides the three offers the best overall performance. Motorguide needs to take a lesson from minnkota on prop design.
Some basics of RC propellers and how to convert from a 2-blade propeller to a 3-blade propeller.