A propeller is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are specially shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft with an approximately horizontal axis.
A lawn mower is a machine utilizing one or more revolving blades to cut a grass surface to an even height. The height of the cut grass may be fixed by the design of the mower, but generally is adjustable by the operator, typically by a single master lever, or by a lever or nut and bolt on each of the machine's wheels. The blades may be powered by manual force, with wheels mechanically connected to the cutting blades so that when the mower is pushed forward, the blades spin or the machine may have a battery-powered or plug-in electric motor. The most common self-contained power source for lawn mowers is a small internal combustion engine. Smaller mowers often lack any form of propulsion, requiring human power to move over a surface; "walk-behind" mowers are self-propelled, requiring a human only to walk behind and guide them. Larger lawn mowers are usually either self-propelled "walk-behind" types or more often, are "ride-on" mowers, equipped so the operator can ride on the mower and control it. A robotic lawn mower is designed to operate either entirely on its own or less commonly by an operator by remote control.
The Porsche Carrera GT is a mid-engine sports car that was manufactured by German automobile manufacturer Porsche from 2004 to 2006. Sports Car International named the Carrera GT number one on its list of Top Sports Cars of the 2000s, and number eight on its Top Sports Cars of All Time list. For its advanced technology and development of its chassis, Popular Science magazine awarded it the "Best of What's New" award in 2003.
A mower is a person or machine that cuts (mows) grass or other plants that grow on the ground. Usually mowing is distinguished from reaping, which uses similar implements, but is the traditional term for harvesting grain crops, e.g. with reapers and combines.
A continuously variable transmission (CVT) is an automatic transmission that can change seamlessly through a continuous range of gear ratios. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps. The flexibility of a CVT with suitable control may allow the engine to operate at a constant RPM while the vehicle moves at varying speeds.
The Ferrari F50 is a mid-engine sports car manufactured by Italian automobile manufacturer Ferrari from 1995 to 1997. Introduced in 1995, the car is a two-door, two seat targa top. The car is powered by a 4.7 L naturally aspirated Tipo F130B 60-valve V12 engine that was developed from the 3.5 L V12 used in the 1990 Ferrari 641 Formula One car. The car's design is an evolution of the 1989 Ferrari Mythos concept car.
The Lotus Exige is a British two-door, two-seat sports car made by Lotus Cars since 2000. Originally a more-hardcore coupé version of the Lotus Elise roadster, since the Series 3 the Exige has been the larger-engined model of the family - using a V6 engine in place of the Elise's straight-four with convertible versions of both available.
Trojan was a British automobile manufacturer producing light cars between 1914 and 1965, and light commercial vehicles for a short time.
A tree chipper or woodchipper is a machine used for reducing wood into smaller woodchips. They are often portable, being mounted on wheels on frames suitable for towing behind a truck or van. Power is generally provided by an internal combustion engine from 2 to 700 kilowatts. There are also high power chipper models mounted on trucks and powered by a separate engine. These models usually also have a hydraulic winch.
A sprag clutch is a one-way freewheel clutch. It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags, or other elements allowing single direction rotation, are used. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the sprags tilt slightly, producing a wedging action and binding because of friction.
The Panhard Dyna Z is a lightweight motor car produced by Panhard of France from 1954 to 1959. It was first presented to the press at a Paris restaurant named Les Ambassadeurs on 17 June 1953 and entered production the following year. In 1959, it was replaced by the Panhard PL 17.
A motorized bicycle is a bicycle with an attached motor or engine and transmission used either to power the vehicle unassisted, or to assist with pedalling. Since it sometimes retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized bicycle is in technical terms a true bicycle, albeit a power-assisted one. Typically they are incapable of speeds above 52 km/h (32 mph).
The Claas Cougar is a self-propelled mower produced by the German agricultural machinery manufacturer Claas. The mower, which is named after the cougar, a large American cat, was first presented in 2003. Due to its maximum cutting width of 14 metres (46 ft) it is classified as the largest self-propelled mower in the world.
Roths Industries, Inc. (1945–1960) was a manufacturer of small garden tractors and other agricultural equipment founded by Herbert C. Roths in Alma, Michigan. The company manufactured Garden King Walking Tractors, BesRo Riding Tractors, and Till Ro Stalk Cutters.
The Škoda Yeti is a subcompact crossover SUV produced by the Czech car manufacturer Škoda Auto and introduced at the 2009 Geneva Motor Show, as the carmaker's first entry into the SUV market. In 2009, the Yeti was awarded Family Car of the Year by Top Gear Magazine.
The Pitcairn PA-34 and Pitcairn PA-33, given the United States Navy (USN) designation Pitcairn OP-2 and United States Army designation Pitcairn YG-2 respectively were reconnaissance autogyros designed and built in 1936 for evaluation.
A motorcycle transmission is a transmission created specifically for motorcycle applications. They may also be found in use on other light vehicles such as motor tricycles and quadbikes, go-karts, offroad buggies, auto rickshaws, mowers, and other utility vehicles, microcars, and even some superlight racing cars.
Atco Limited was a British mower company which traded as "Atco Ltd" from 1981 to 1990, making lawn mowers and garden tools. It sold a range of lawn mowers including lawn and garden tractors.
The Audi R8 LMS Cup was a one-make sports car racing series by Audi based in Asia. Audi R8 LMS Cup cars were based on the Audi R8 LMS (GT3).
The Showers Skytwister Choppy is an American helicopter that was produced by Showers-Aero of Milton, Pennsylvania, introduced in 1992. Now out of production, when it was available the aircraft was supplied in the form of CAD plans for amateur construction.
