How much slip is the optimum amount for your application? Only if you care about insignificant, little items like thrust. Any sharp turn is a challenge for our boat, particularly serious is a sharp turn to port. To reduce the turning radius we once again make use of her prop walk. Propeller slip is affected: by factors related to the engine, the boat and the boat set-up: the type of the hull and its condition, the weight and the aerodynamic design of the boat, the design of the engine’s lower unit, the mounting height of the engine, the loads as well as the design of the propeller itself. General Q & A - reducing prop slip - i keep running the number through the slip calc and wind up around 25% slip. When an outboard motor has a spun hub in the propeller it can feel like you are driving a car that has a slipping clutch, and in many ways it is a similar problem. How can i redcue taht? Propeller slip, also known as prop slip, is a critical statistic that directly affects performance.

Currently my drive won't trim up as high as it should (s If the prop did not slip at all as it screws through the water, each rev theoretically propels the boat the forward a distance equal to the prop pitch. The simplest way to explain prop slip is to think of a screw.

My real question should be How do I figure out propellor slip for props that I dont even have. 3. Black max 3 blade 15.25x15 20mph@ 5000rpm Solas amda 4 blade 14.75x15 22@ 5500rpm Should I try a bigger diameter prop to reduce slip Typical prop slip for a single is usually 5 - 15 percent though figures greater or lower are not necessarily bad or uncommon. Pitch is the distance the screw traveled during one complete turn. 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. When you can reduce the overall prop slip results, this can help improve fuel efficiency and performance. Note that the Raker has two vent holes on the prop, but the viper does not have one.I calculated the slip to be 30% on the raker 24pitch & 37% on the viper 21". I am getting a prop slip rate of 20%. 4. Powered by a Honda 150. Any sharp turn is a challenge for our boat, particularly serious is a sharp turn to port. Prop Slip Calculator. There seems to be high amount of slip on the prop. Per my last post I have tested two props on my tritoon and both have high slip numbers, around 40%. I just ran the prop on the river before all the debris started. (John told this to me before I bought my prop and what he said came true.) I used the mercury site for the calculator as well as Mark's Prop site ..

Low prop slip should NOT be a … Causes of prop slip? If you go stainless, and decide to go with a Merc. However, a prop must slip somewhat to work properly and efficiently. Having your lower unit too deep in the water, causes drag on the gearcase, and increases slip, because you are pushing too much, having the lower unit out too far, will cause slip by causing the prop to suck air and ventilating. The optimum propeller will provide enough lift to get the hull high enough out of the water to reduce drag and the rest of the energy will be transferred to forward movement. To determine the prop size, measure the distance of forward movement for one complete rotation of the prop. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. Calculated prop slip is simply a tool to help analyze how a given propeller is performing on a given boat.

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