The fourth blade should help you stay hooked up. Motor height mounted with anti-cav plate 2.25″ above boat bottom.

The pressure difference, like the airplane wing, causes lift at right angles to the blade surface. Thank you! Only if you care about insignificant, little items like thrust. 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.

Lift can be divided into a thrust component in the direction of travel and a torque component in the opposite direction of prop rotation. The Bravo will appear to have more slip if you are hitting the limiter because it is essentially a lower pitch than the Fury. I get 35.5 mph at 6030 rpm at 4200 ft of elevation. At 3700 rpm the speed is about 26 mph (23,5 knots). thanx a lot.It is much more clear now. Hi, You do not need to be out near the rev limiter to be making peak power on that engine. Others with identical setup are running as much as 22P Bravo 1 and seeing 5500 RPMs and 57 MPH which is 8% slip. You will likely feel the prop slipping at high RPM. You can also score your mark using a file. Prop hub replacement cost is often anywhere from $50 to $100, depending on your engine and where you take it.

6 sec count, Bravo I FS 20 – time to plane approx.

We offer the Enertia ECO XP down to a 16.5 pitch, but I think that would be a bit too big of a propelller for you. 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?? 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. It has holeshot issues with a three blade, so have been trying the 4 blades. Thank you, It is a tell tale sign that an engine is too high when the slip number starts to increase (higher RPM without increasing speed).

Here’s our prop slip calculator: http://mercuryracing.com/propellers/propslipcalculator.php

Is it important to know your prop’s slip? The Nitros have been performing very well with the Bravo, both top end and handling.

Topped out 48mph@4800 full of gas one passenger. Do you think I can achieve better results with a Bravo 1 XS or other prop? This is an interesting read. 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. Sorry for the late response. Back in the day that is how we did it. This might not be the place to ask but seems this is where the knowledge hangs out. Save my name, email, and website in this browser for the next time I comment. To tell if your hub has spun, mark a line on the back of the prop hub with lipstick.

I have something very interesting going on that from past experience is not adding up. I’m running 65.4mph at 6000RPM, which is about 18% slip.

Simply, it does depend on prop pitch: Theoretical speed = pitch x prop shaft rpm (with unit-of-measure conversion constant). Your email address will not be published. Then will see.. My thinking is raising the engine one hole (+ 3/4″) would put it too high at 3″, and dropping to 21P would add 200 RPM but maybe not more top speed due to lower pitch. I am barely getting into the max rpm range at 4800rpm @ 40mph.

I am having trouble identifying the best prop for overall use with this boat and motor. Consider the 28 pitch Bravo I XS. Your email address will not be published. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. Nice cruising boat with a 17P Vengeance prop. The GPS speed was measured using my Hummingbird unit and a phone app for GPS speed, and they both matched. I have a light 5 m RIB and recently i bought a Spitfire X7 17 pitch prop. The boat is a Bass Cat Pantera Classic.



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