See full version: Information on Props
For the optimal set-up, each prop has an optimal diameter and optimal pitch. The diameter must be found by experimentation. Optimal performance is never achieved by trimming the tip or trailing edge of a blade, or by cutting off a section the trailing edge. The slope of the blade's edge at tip is very important, a typical mistake there increases the drag while providing no benefit. [links]
If the motor's jacked up and you have a rooster tail shooting upward, then you're losing prop efficiency: the water should be thrown back parallel to the direction of travel. more
'Cup' should feather rapidly to zero at maximum blade radius. Cupping beyond that will make the prop 'catch' faster and will reduce the top speed. Next is about drag reduction. more
Imagine a plane perpendicular to the propshaft axis, with a pitch the same as at the blade's mid-section, e.g. 'Rake' is the angle of the blade relative to this plane. A zero-rake surfacing prop, typical on the old inboard hydros, tends to climb toward the surface, lifting the transom. This is how hydros 'prop-ride'. A blade with positive rake tends experiences a downward force that makes the gearcase want to go deeper. This effectively increases the trim angle and thereby increases the water pressure at the transom dynamically. With increased positive trim the boat runs with less surface in the water and the bow rides higher. In common but wrong parlance, the positive rake generates 'bow lift'. But as Louis J. Baumann says, and I agree, there's no such thing as 'bow lift', there is only a downward force on the prop blade.
Many outboarders learn that a prop must be cupped if you want to jack up the motor higher than about 18". The cavitation plate on a shortshaft motor (15" downhousing/midsection) is slightly above the waterline at about 17 5/8". With a shortshaft motor, the tip of the prop blade starts piercing the water at transom heights of 18" (or at 23" for a 20" downhousing/midsection). A shortshaft motor on a fast pad v-bottom like an Allison will run 21-22" high on the transom, with no jackplate to place the gearcase farther downstream of the pad. Any time the blade tip pierces the water surface the prop must be cupped, otherwise the RPM is unnecessarily high and the prop efficiency is very low. The cup on the trailing edge works just like the flap on an airplane wing: the pilot drops the flap to increase the lift on the wing. Airfoil theory has been well-understood since 1916, it was explained by a German engineer named Prandtl. more
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Surface Drive Propeller 2 Blade Propeller For Boat Yacht
A boat’s motor is a huge investment. It’s the heart of your vessel, so you want to avoid making the wrong choice. The tough part is that outboard and inboard motors are both valid choices and they’re both designed for different people. If you want to make the right choice, then you’ll need to learn more about both motor types. In this piece, we’ll explain everything you need to know about an outboard and inboard motor, and we’ll help you pick which one is right for you. What. Read More here
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In celebration of Labor Day, our offices will be closed on Monday, September 6th. All orders placed after 2pm on Friday, September 3rd will not ship until Tuesday, September 7th. here