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The patented device has been marketed since. After the Volvo Penta patents ran out, Mercury Marine has also produced a corresponding product, MerCruiser Bravo 3. However, in commercial ships and in traditional machinery arrangement, contra-rotating propellers are rare, due to cost and complexity.
Mercury Marine is a marine engine division of Brunswick ... Subsidiaries include Mercury Precision Parts and Accessories as well as Mercury propellers and Mercury Jet ...
Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...
The pivoting design allows the outboard motor to be swiveled by the operator in almost all directions: Sideways for direction, up and down to change the thrust line according to speed or bow lift, elevate completely out of water for easy starting, placing the drive shaft and the propeller forward along the side of the boat for reverse, or put ...
The outdrive resembles the bottom half of an outboard motor and is composed of two sub-units: an upper containing a driveshaft connected through the transom to an engine which transmits power to a 90-degree-angle gearbox; and the lower containing a vertical driveshaft receiving power from the upper unit gearbox, transmitted through another 90 ...
Ducted propeller – Marine propeller with a non-rotating nozzle Pump-jet – Marine propulsion system; Folding propeller – Propeller with blades that fold open; Helix – Space curve that winds around a line; Impeller – Rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid or gas