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Hand crank for a winch on a sailboat - commonly referred to as a winch handle. A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft. When combined with a connecting rod, it can be used to convert circular motion into reciprocating motion, or vice versa. The arm may be ...
Glider winch. Winch spool can be seen on the side of the truck, while cables to the right of the image are attached to the glider(s) being launched RCAF CH-149 Cormorant rescue helicopter, with rescue team on winch. Gliders are often launched using a winch mounted on a trailer or heavy vehicle. This method is widely used at many European ...
Capstan winches were also important on sailing trawlers (e.g. Brixham trawlers) as a means for fetching in the nets after the trawl. When they became available, steam powered capstan winches offered a great saving in effort. These used a compact combined steam engine and boiler below decks that drove the winch from below via a shaft.
Roll-on, also known as a "Roller style trailer", uses rubber and/or polyurethane rollers for ease of launching and loading a boat. Glide-path, also known as a "Float-on style trailer", allows the boat to float onto the trailer; after the trailer has been partially submerged (usually 3 ⁄ 4 of the trailer). Since its inception, it has become ...
Winch. A grinder is a crew member on a yacht whose duties include operating manual winches (called "coffee grinders") that raise and trim the sails and move the boom. [1] It is a physically demanding role with a significant impact on a racing yacht's overall performance.
Boat suspended from Welin Quadrant davits; the boat is mechanically 'swung out' HMS Victory in the 19th century, showing her boats suspended from wooden davits Gravity multi-pivot on cruiseferry Scandinavia Gravity Roller Davit Gravity multi-pivot davit holding rescue vessel on North Sea ferry Freefall lifeboat on the Spring Aeolian Frapping line Labeled Tricing Gripe Steps to launch davit ...
The crane's hook is kept level by automatically paying out enough extra cable to compensate for this. This is also a purely mechanical linkage, arranged by the reeving of the hoist cables to the jib over a number of pulleys at the crane's apex above the cab, so that luffing the jib upwards allows more free cable and lowers the hook to compensate.
Diagram 3 shows three rope parts supporting the load W, which means the tension in the rope is W/3. Thus, the mechanical advantage is three-to-one. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle.