The Nitros have been performing very well with the Bravo, both top end and handling. With this prop the slip is negative, so is there by any chance an issue with the prop’s pitch ? Also, how do the number of blades effect slip, 3,4,5? Hole shot will improve and you will be able to run the engine higher. I’m hearing keep the pitch same and try the high five. You helped me prop my 2015 Ranger with the Bravo XS and I have loved it from the beginning and have turned several other guys on to the Bravo and have cured set up nightmares. Any idea why the slip numbers are so different between the two? According to my calculations the actual pitch is larger than 18. Prop Slip Calculator. Engine is Mercury 115 CT PRO xs 2017, ratio 2,38. The 16 pitch will offer you great handling and top end speed will be about 40 mph with the 1.85 gears. and like we did in 2015 run a slightly higher pitch like a 25-25.5? If you have the proper tools, you can do this process yourself. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. It sounds like it is in the optimal position. You do not need to be out near the rev limiter to be making peak power on that engine. Best Gifts for Boat Owners This Holiday Season, 9 Tips for Winterizing Your Boat’s Marine Electronics. Top end gains will be small, maybe 1 mph over your 25 Fury. 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? Prop is slipping at high rpm 80hp - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website. Is the slip to high 17 %, is there any better choice for a propeller. Similarly, marine propeller blades operating at a zero angle of attack produce nearly equal positive and negative pressures, resulting in zero thrust. Should I be running a smaller diameter prop even though I’m at optimum WOT? It is the most misunderstood of all propeller terms. Take on more slip for higher top end, faster cruise but lower RPMs, or, leave it alone and stick with what I got? 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. Now that Eco like to be run deeper on the JP by 1 to 2 inches it seems than my B1FS props on prior boats. If you still have a 27 pitch Bravo I XS, you can plug the 4 forward vent holes and test it. Motor is a 200 Pro XS V8 with the Mercury Monitor Gauge. I had a 23p Fury 3 blade on it running 5580 RPMs and had to bottom out the jack plate to hit 64.6. The GPS speed was measured using my Hummingbird unit and a phone app for GPS speed, and they both matched. The rubber inner bushing inside an outboard propeller hub is designed to absorb the shock created by shifting. So , after reading prop school from 1-6, I am thinking about : Note: WOT (wide open throttle) measurements are made with a tuned engine, a clean boat hull, loaded with an average boat load, and the propeller clean and undamaged. The most RPM’s I am able to turn is 5350 according to the gauge. Should I jump up to a Bravo 29? Since most of the time I am running with a partner, gear, and fair amount of fuel, my RPM’s are 300 below max WOT for this engine, although still well withing the recommended range of 5000 -5750. A propeller turns in much the same way and also has a pitch. Topped out 48mph@4800 full of gas one passenger. The curvature of a wing reduces static pressure above the wing — the Bernoulli effect — so that the pressure below the wing is greater. For your setup, the standard 15 pitch Revolution 4 should be a great starting point. If it has, you have spun a hub. If you are outside of the US, you may have an easier time getting your hands on the standard Mercury 15 pitch Revolution 4. WOT = 54.1 mph on my Simrad gear @ 6,050 and really about what I expected for this size rig with a T-Top. We tried a 24p and it was much the same. With a positive angle of attack, even higher pressure below the wing creates still more lift.

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