how to reduce prop slip

Prop Slip Calculator.

What is your excuse for being up at this ungoddly hour? Pitch is not so easy to measure. Drag--- increases prop slip as well as the design of the prop and the cup, angle of the blade, and how many blades it has on the hub ie...3,4,5 or 6 take your pick. The GPS speed was measured using my Hummingbird unit and a phone app for GPS speed, and they both matched. Wings carry the weight of the plane by providing lift; marine propeller blades provide thrust as they rotate through water. I just ran the prop on the river before all the debris started.

Happy boating!I’ve been experimenting with my setup under different conditions and have some concerns. Great combination of handling and top end speed.

I can also take a look at yours to see whats going on with it. Close X I am currently trying a Fury 4 25p that is allowing me to raise the jack plate and give some transom lift but I am only turning 5500RPMs at 68.5.

5500 rpms WOT, 1.75 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 73.5,water pressure is 22psi with Merc low water pickups at WOT.

Realistically, you are running a prop that is closer to 25 or 25.5 pitch, plug that number in and you are closer to 7%.

Hole shot is very good.

Download it for free fromI hope you have found my Prop School blog series both educational and useful.

to add. Thank you for any insight!Sounds like you are hitting a rev limiter at 6300? Hole shot will definitely be slower going with the 29 pitch, but if you are very happy with the current hole shot, it could be manageable. Just picked up a little Bayliner Vr5.

My heavy boat does not get any major bow lift when trimmed running WOT. Any idea why the slip numbers are so different between the two? We do this by matching the propeller diameter and blade area to the engine horsepower and propeller shaft RPM. Your slippage figures are correct, right at 20 percent or so. You can open up all eight vent holes.

If an airplane wing were symmetrical (air moves across the top and bottom of the wing equally), the pressure from above and below the wing would be equal, resulting in zero lift. Calculating Rotational Speed, Blade Tip Speed and Slip Our propeller engineers study props at the 7/10 radius (70% of the distance from the center of the prop …

Bill- Your prop slip may not be that high. If you go stainless, and decide to go with a Merc.

You do not need to be out near the rev limiter to be making peak power on that engine.

TM on bow. therfore your efficiency is 98.7% of what mine was. A prop of 21 pitch will move the hull forward 21 inches if there is zero slip in one revolution. There are sticky threads for the If it is a stock aluminum prop, then that might be as good as it gets.

I believe the monitor gauge is correct as at idle I am at 650rpm’s.So if all of the variables are correct (gear ratio, rpm’s, and speed) is 2% prop slip even achievable?Yes it is possible, especially since the Fury props run tall in pitch. the ratio of rpm/speed is 90.56. your ratio is 89.36 (4200/47). Also, how do the number of blades effect slip, 3,4,5?It really depends on the application. 04-06-2008, 08:27 PM. 6 in Bobs. Propeller slip, also known as prop slip, is a critical statistic that directly affects performance. Totally differnt prop. Currently my drive won't trim up as high as it should (s This seems a little high to me as well.
Pitch is the distance the screw traveled during one complete turn. Quote: Originally Posted by millhouse961.

puder, my 211 liberator I had would turn a 21" up to 4800. perfect for the small block. Is there any benefit to adding RPM by tweaking things such as going to lower pitch prop or raising engine further? Is that normal? Congratulations to Craney, our July Boat Photo Contest winner! The simplest way to explain prop slip is to think of a screw. boat is a12 250 pro xs 12 Nitro Z8 10 inch hydralic jp i like the 16 inch diameter would this prop work looking for more speed and what pitch would be recommened thankConsider the 28 pitch Bravo I XS.

I needed to drop 200 RPM also. Would a smaller 4 blade help? Puts my slip % pretty high at about 27. My actual is 47, which leave my slip at 34%. Motor height mounted with anti-cav plate 2.25″ above boat bottom. Slip is not a measure of propeller efficiency. It is NOT the distance from the leading edge of the blade where it meets the hub to any part of the trailing edge. John at DAH only works on stainless. That hull definitely likes all of the lift it is getting from the ECO.


Similar to the airplane wing, some angle of attack is needed for a propeller blade to create thrust. It will be great for pulling skiers, those props have great forward thrust. I would like more top speed without losing hole shot. Please note that they do not hook up as well in reverse as your three blade, it will take a little longer to stop the boat and get it going in reverse.

Currently running an Optimax 200 on a Recon 985 with a 22P Bravo 1 XS. The Nitros have been performing very well with the Bravo, both top end and handling.

Thank you for all. (Such as if you make a hard low speed turn and gun it cuasing cavitation) How can i reduce prop slipage? My rig is a 2015 Ranger Z119C with 225HO ETEC G1. If the blade had no angle of attack, there would be no slip; but, of course, there would be no positive and negative pressure created on the blades and, therefore, there would be no thrust. Too much diameter and or blade area will reduce slip, but at a consequence of lower overall efficiency and performance. That was very helpful, thanks. I have a 2005 Checkmate Pulsare 2100 w a 2005 promax 300x with a sportmaster 1.62 lower.currently running 27p Trophy Plus that will turn 5900 at 80mph…it seems like this combo should run faster to me.. what prop would you recommend?? I care most about fuel economy do I stay with a tempest and go to 17p or would a enertia eco be better.With how well the Tempest is hooking up, I would stay with that prop family and switch to a 17 pitch.

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