How to reduce prop slip

On paper I would think that all else being equal as blade area increased prop slip would decrease. Typical prop slip for a single is usually 5 - 15 percent though figures greater or lower are not necessarily bad or uncommon.

On paper I would think that all else being equal as blade area increased prop slip would decrease.

How to reduce prop slip. Make sure your tach is correct. Make sure your speed reading is correct gps not speedometer. If I had to guess what the problem is from 1000 miles away.

Youve got 1 or 2 bad spark plugswires. This will cause false high rpm readings on the tach and the boat will be down on hp resulting in slower top speed. Lower on the plate will have more bow lift and better holeshot but too low with a 30p Chopper will drastically limit WOT rpm and bog your motor to death.

Higher on the plate will increase speed depending on how light the hull is up until the point that increasing slip. If playback doesnt begin shortly try restarting your device. Videos you watch may be added to the TVs watch history and influence TV recommendations.

To avoid this cancel and sign in to. Prop slip will reduce that distance. Its important to understand that a slipping prop is not the same thing as a spun prop.

Causes of Prop Slip. Prop slip happens to every propeller and how much slip you experience depends more on the design of the prop than on the drag of the water. Knifing will reduce slip and some RPM.

If you go stainless and decide to go with a Merc. Prop you can get a work of art or you can get a piece of junk. John told this to me before I bought my prop and what he said came true.

On paper I would think that all else being equal as blade area increased prop slip would decrease. Larger diameter props and 4 blade props would both offer more blade area than smaller diameter or 3 blade props. Still on paper the downside to more blade area will be reduced performance at higher rpms and higher speeds due to prop frictiondrag on the water.

With this boat I dont think. If your engine is producing no more than 150HP a 28 P. Prop will decrease RPM and perform similar to the 24P.

If RPM drops below 5500 top speed will be less. Knifing will reduce slip and some RPM. If you go stainless and decide to go with a Merc.

Prop you can get a work of art or you can get a piece of junk. John told this to me before I bought my prop and what he said came true. Careful reworking of the blades can reduce prop slip that is directly attributable to the prop.

Hull drag can be reduced by lifting more of the hull out of the water thereby reducing wetted surface or by blueprinting the last couple of feet of the running surface. Lower unit drag may be reduced by raising the engine while adding a more. Also how can I improve my prop slip.

If the prop slip is too high for any given boat the slip can be improved by adding diameter adding cup or going to a prop with more blades. All of which add more load. Secondly what causes outboard motor cavitation.

The most simple definition of cavitation is. An action that causes a void to form because of. The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch.

To calculate your slip percentage. Enter your GPS verified top speed. Enter your drives gear ratio.

Enter your maximum achieved RPM. Enter the pitch of your current propeller. Large diameter propellers have less slip just like propellers with great amount of cup which improves their grip on the water and therefore the slip is reduced.

By external factors such as sea state sea currents or the intensity of the wind. 5500 rpms WOT 175 gears 24 pitch with cup so add 1 degree for cup that makes the prop a 25 pitch max mph via two separate gps is 735water pressure is 22psi with Merc low water pickups at WOT. Mark was very clear that less than 4 slip is completely.

Increasing the pitch by an inch or two decreases the RPM accordingly and puts you back in the RPM range sweet spot. If the motors RPM is below the manufacturers range the boat is over-propped and decreasing the propeller pitch will increase the RPM to where it should be. Prop slip is based on your boats bottom efficiency the slip can be reduced by blueprinting your bottom or getting a more efficent prop.

Just from others i have seenI think your tach might be off a tad therefore your propslip would seem higher than it really isHave a buddy that runs a 25 gade on a 19ft stratos and after getting is setup he had the prop worked by rich boger and he gained like a little over 4mphHe tried several other stock gades before that and although they were same pitch and diam. Each one ran different and had a little difference in top speedLike bullet said could be just your prop. Typical prop slip for a single is usually 5 - 15 percent though figures greater or lower are not necessarily bad or uncommon.

There is too much emphasis put on propeller slip. Calculated prop slip is simply a tool to help analyze how a given propeller is performing on a given boat. Propeller slip occurs with every propeller but the amount of slip varies depending on propeller design.

Well-configured props will have as little as 10 to 20 slip. How much slip is the optimum amount for your application. Its a question to ask a prop professional.

Constant pitch or progressive pitch is a question for the experts. We diminish slip by running as close to the best prop we can to minimize the slip co-efficient. A higher rake bigger diameter prop will grab more water than a small rake small diameter prop.

So that SHOULD be what we are looking for. An increase or decrease in one is usually associated with an increase or decrease in the other. Propeller slip is the difference between the geometric pitch of the propeller and its effective pitch.

Figure 1 Geometric pitch is the distance a propeller should advance in one revolution with no slippage. Effective pitch is the distance it. Prop hub replacement cost is often anywhere from 50 to 100 depending on your engine and where you take it.

Fixing the prop requires pressing out the old hub and replacing it with a new hub. If you have the proper tools you can do this process yourself. As already stated your slip numbers will decrease dramatically as the speed increases and drag is reduced.

At 60 mph I am about 25 depending on which props are on and how many people are in the boat. At speeds not mentioned my slip drops to somewhere around 10 depending on people and props. In the case of a prop it slips a lot at low speed but as soon as the boat speeds up slippage reduce some and you get better bite in the water so it becomes more efficient.

My real question should be How do I figure out propellor slip for props that I dont even have.