prop slipping at high rpm

The GPS speed was measured using my Hummingbird unit and a phone app for GPS speed, and they both matched. 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 thank. Yes it is possible, especially since the Fury props run tall in pitch. I guess I don’t understand the issue some have with losing RPM if you’re gaining 10 to 15% top end. Brian, Tempest 21 – full of fuel, driver only, musky gear, empty livewells Revolution 17 P. Prop is a 24 pitch 3-blade Fury LT. The rubber hub bushing also serves as a "breakaway" should you strike something, allowing the prop to spin, and so protecting drive train components like gears. So if all of the variables are correct (gear ratio, rpm’s, and speed) is 2% prop slip even achievable? Slip is not a measure of propeller efficiency. Question on my center console: I am currently using standard Rev4 17P on the new 200HP Mercury 4 strokes (1.85 Gear Ratio). Learn all about boat propeller fit with our Boat Propeller Fit Guide. I am not in position to test props before, so I would like to be as close to “very good” as possible. Awesome data. I am having trouble identifying the best prop for overall use with this boat and motor. At WOT, I am seeing 5800 RPMs (Max for engine) and 50 MPH (verified on vessel view) which is 1% slip. Consider the 27 pitch Bravo I XS, you can expect to gain 3 mph and hole shot will improve. Today, you can get all of your prop information with our Prop Slip Calculator App. My question is am I too efficient? Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. You will likely feel the prop slipping at high RPM. Is there any benefit to adding RPM by tweaking things such as going to lower pitch prop or raising engine further? BR Ivica. Your help would be greatly appreciated!! See below for my test results. One of the most common questions is about prop slip. 9,8 ft (3m) beam width I am about to receive (in one week) new Quicksilver 875 sundeck with SINGLE Verado 300 V8 XXL. What is main difference between REV 4 and REV4 XP ? I am doing my calculations based on slip. The 8 vent holes on the Bravo I XS will help with planing performance. I’m hearing keep the pitch same and try the high five. Best Regards, Time to plane approx. Will I have holsehot issues going that big? Mostly everybody offers 18 + pitch. I have a 22 B1FS laying around to try and wonder what y’all think about that or the L, or other props for this rig? 6 in Bobs. hi coming with boat and make some testing. Thank you for all. Prop slip appears to be low but it won’t hardly come out of the hole and is running 300-400 less RPM’s than I would have expected. Back in the day that is how we did it. Sounds like you are hitting a rev limiter at 6300? Congrats on the new boat. Is it true that Cleavers have negatively progressive pitch? Later when I will see actual data it will be easier to upgrade – if needed. The fourth blade and 15.25 inch diameter will help you make the most of your hydraulic jack plate. Enertia ECO 17P or Only if you care about insignificant, little items like thrust. With how well the Tempest is hooking up, I would stay with that prop family and switch to a 17 pitch. It’s going to be hard to beat the Trophy for your setup. This is a pretty empty boat (1/2 tank of gas, just me operating and a 9.9 kicker. Here’s our prop slip calculator: Is there (or what is) the maximum speed at which a propeller can be rotated in the water before it starts to lose efficiency – presumably this varies with the diameter of the prop – so I am probably asking what is the maximum usable velocity of the tip of the prop?? With a positive angle of attack, even higher pressure below the wing creates still more lift. Ivica. Only if you care about insignificant, little items like thrust. But, when RPM is increased, the engine revs with little or no boat acceleration because the prop begins to spin. Propeller slip, also known as prop slip, is a critical statistic that directly affects performance. BTW I was checking REV 4 XP 16 RH + flow torq ss adaptor for 5/4″, but did not find anybody offering it. My max speed (GPS) is 68mph. Lift can be divided into a thrust component in the direction of travel and a torque component in the opposite direction of prop rotation. You will likely feel the prop slipping at high RPM. The number of blades on a prop has become very important over the last few years because everything has gotten bigger- engines, boats, and gear cases. In a car or truck if you are trying to go up a hill with a heavy load, the transmission must be downshifted into a lower gear making it easier for the engine to turn the rpms it needs to move the weight. Each time a screw makes a complete turn, it has completed a "pitch." Full fuel load – couldn’t touch 6000 (5980-5990) rpm but 1.5 mph gain, Bravo I FS 21 – time to plane matched the FS 20 (down 7 gallons of fuel from full) and top speed .5 mph gain over the 20 with no difference in top, Boat 2 – 2018 Ranger 619 FS, 225 Verado, kicker Tempest 21 – ¾ fuel, driver and passenger, musky gear, livewells You would be looking for part number 8M0142116 for the Rev 4 XP, and a FLO-TORQ SSR HD hub kit, part number 8M0101601. So , after reading prop school from 1-6, I am thinking about : I have all the plugs open on the 26 Fury. It sounds like it is in the optimal position. I guess I don’t understand how you can come up with a theoretical boat speed that does not depend on the pitch of the prop? With this prop the slip is negative, so is there by any chance an issue with the prop’s pitch ? Sometimes, the hub only spins when the engine revs above a certain RPM, causing many boaters to wonder if they have spun a hub, are experiencing ventilation or cavitation, or have some kind of gear or power issue with their outboard. Your email address will not be published. Slight chop on the water Any suggestion for dealer ? Motor height mounted with anti-cav plate 2.25″ above boat bottom. The 19.5 pitch ECO XP from Racing could give you 1-2 mph increase. You are spot with pitch, there is generally a two inch pitch difference between the Racing Bravo family and the Fury family. This has been a great series and I have learned a great deal! Four and five blade props have taken the place of many three blade props because they offer more grip at higher engine heights, better boat control, and more lift. 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%. The net of these two forces pushes the wing upward. Download it for free from Google Play Store or Apple iTunes. Click here to see some real world examples on how I use the app. Take on more slip for higher top end, faster cruise but lower RPMs, or, leave it alone and stick with what I got? and like we did in 2015 run a slightly higher pitch like a 25-25.5? Hole shot is outstanding. Does anyone know where you can buy a copy of the “Everything You Need to Know About Propellers” guide online? As we know, it turns like a 2 inch stiffer prop – and thus the slip #s range from 8 to 16% depending if you use the 19 or 21 in the slip calc tool. Propeller – Don’t Fix What Isn’t Broken, California Transparency in Supply Chains Act. Ideally should prop slip be the same throughout all RPM’s. This is an interesting read. Expect RPM to raise to 5800-5900. It currently has a 17P aluminum 3 blade at WOT it maxes out at 6100 RPM and 36 GPS measured MPH. It worked well and thanks for putting the tools out there to help customers to get a better understanding of how props work. Scott, long time no see. If you still have a 27 pitch Bravo I XS, you can plug the 4 forward vent holes and test it. Fixing the prop requires pressing out the old hub and replacing it with a new hub. With the new four stroke, you can migrate over to the Bravo I FS line, same design minus the extra vent holes. You’ll likely want to take it to a marine mechanic or prop shop if you’re not handy. It appears that I have more slip at mid range speeds than I do top end. The Mercury Racing Prop Slip Calculator (below) lets you quickly determine propeller slip. That is based on an estimated 41-43 mph top speed. Engine is Mercury 115 CT PRO xs 2017, ratio 2,38. I think REV 4 is only available in 15 and 17 pitch (not 16) ? Slight chop on the water If you have the proper tools, you can do this process yourself. You do not need to be out near the rev limiter to be making peak power on that engine.

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