As we are trying to explain how a propeller works, in most of the cases we compare it with a screw which enters into the wood. But in reality, the propeller operates in the water and thus slides as it rotates. This means that each propeller loses a part of its performance, so the actual distance it finally travels in one revolution is always less than its nominal pitch indicates.
Facing one of the best well-designed ribs which is indeed characterized by its fast hull, and two of the best-designed propellers it was impossible to resist the temptation.
We tested the Hydromotive 15 ½" x 19" (lab finished) and the Eco Enertia 16" x 17" in a Technohull SEADNA 999 on the transom of which a Verado 350hp was mounted.
Revolution is one of the best designed 4-blade propeller which is recommended for engines above 200 hp. The large surface area of its blades, the aggressive cupping and the high raked blades are the main characteristics due to which its performance is enviable.
In order this to happen however, the prop should match to the boat-engine combination and of course the type of the hull, its length and the total weight of the boat to enable it to show the advantages of its design.
There is no doubt that the Tempest plus and the Revolution are two well – known propellers which take the first place in the preferences of the skippers. Still, this doesn't happen with Enertia, which is a rather 'misunderstood' propeller.
One of the best known propellers for all around use, especially in the field of inflatable boats, is the Mirage plus. Its good performance in many different types of boats and hulls classifies it at the top of preference of many skippers.
At that morning we loaded 19 propellers in the small cabin of the Shearwater 860 which was powered by a single 300hp Suzuki outboard engine and headed to Serifos Island. Our aim was to make an exhaustive test of various props and then to choose the right one.