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Self-actuating variable pitch propellers. A self-feathering propeller is not more efficient than a fixed bladed prop, as neither type can adopt an optimal blade angle. Exceptions are the Bruntons Autoprop, Darglow FeatherStream, and the V-Prop, all of which are not merely folding propellers, but are self-actuating variable-pitch propellers. On ...
A sailboat or motorsailer when voyaging on sail alone will benefit from reduced drag, and just like an aeronautical propeller, a marine VPP may be "feathered" to give the least water resistance when sailing without using power. A VPP is particularly useful when motorsailing (i.e. voyaging under both power and sail), as the VPP can be coarsened ...
In modern times, human propulsion is found mainly on small boats or as auxiliary propulsion on sailboats. Human propulsion includes the push pole, rowing, and pedals. Propulsion by sail generally consists of a sail hoisted on an erect mast, supported by stays, and controlled by lines made of rope.
Variable-pitch propellers may be either controllable (controllable-pitch propellers) or automatically feathering (folding propellers). Variable-pitch propellers have significant advantages over the fixed-pitch variety, namely: the ability to select the most effective blade angle for any given speed;
The Blackburn B-20 was an experimental aircraft, first flying in 1940, that attempted to drastically increase the performance of flying boat designs. Blackburn Aircraft undertook an independent design study based on a patent filed by their chief designer, John Douglas Rennie [1] for a retractable pontoon float that formed the planing hull.
Modern boats have a Beta Marine 20 or 25 horsepower engine with folding or feathering propeller, in conventional or hybrid configuration. Though small in terms of accommodation in comparison with modern boats with wider beams and greater headroom, the compact cabin of the Contessa resulted from the low, narrow-beamed design that emphasized ...
Costco eggs recalled were given a recall of the highest level by the Food and Drug Administration for potential contamination with salmonella.
The auto feather system also allows pilots to reduce the drag of the propellers during an engine failure, therefore, allowing the plane to glide for a longer period of time. An automatic feathering system was first introduced on the Martin 4-0-4 aircraft, a piston engine airplane. The system was designed to automatically feather an engine that ...
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