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The primary difference between internal drive boats and external drive boats is that the propeller is enclosed inside the hull of an internal drive boat whereas the propeller is exposed outside the hull of a stern drive, V-drive or straight shaft drive boat. A conventional screw propeller accelerates a large volume of water by a small amount ...
The rim-driven thruster, also known as rim-driven propulsor/propeller (or RDP) is a novel type of electric propulsion unit for ships. The concept was proposed by Kort around 1940, but only became commercially practical in the early 21st century due to advances in DC motor controller technology. [ 1 ]
The advance ratio is critical for determining the efficiency of a propeller. At different advance ratios, the propeller may produce more or less thrust. Engineers use this ratio to optimize the design of the propeller and the engine, ensuring that the vehicle operates efficiently at its intended cruising speed, see propeller theory.
Lightly loaded propellers for light aircraft and human-powered boats mostly have two blades, motor boats mostly have three blades. The blades are attached to a boss (hub), and while it can be a big boss, it should be as small as the needs of strength allow – with fixed-pitch propellers the blades and boss are usually a single casting.
Or engines, especially engines.” In 2020, a Sarasota luxury boat building company Yellowfin Boats, reported that about $400,000 worth of equipment had been stolen while the store was closed over ...
An early engine of the company was the Model 102, developed from the Marston models of the 1930s. The Model 102 engines were fairly large and featured an integral engine cylinder block and head, with a water-injected exhaust. Some Model 102 outboards had a 13-inch-diameter (330 mm) propeller, gaining the moniker of "The Barge Pusher".
An 11-year-old girl was horrifically killed in a Florida lake when she was thrown from a boat and then struck by its propeller, officials said.
A Florida sheriff’s deputy owes his life to a group of good Samaritans, who rushed to help when he was thrown into the blades of his boat’s spinning propeller, according to investigators.
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