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2. Gravely Tractor - Wikipedia

   en.wikipedia.org/wiki/Gravely_Tractor

   The all-gear walk-behind units were powered by a single-cylinder four-stroke engine, available in a one-wheel model D (1916−195?) and the two wheel model L (1936−1966) and the two wheel model C (1967–1976). Variations of all models included bodywork changes, mechanical changes and color changes throughout their production.

3. Two-wheel tractor - Wikipedia

   en.wikipedia.org/wiki/Two-wheel_tractor

   BCS was founded in 1943 by Luigi Castoldi in his workshop in Abbiategrasso, a small town near Milan. The area was and still is highly agricultural. For this reason the motor-mower (essentially an engine-driven, walk-behind sickle-bar mower) model 243 was created. This was among the first self-propelled motor-mowers in the world.

4. Lawn mower - Wikipedia

   en.wikipedia.org/wiki/Lawn_mower

   Ideal Power Mower also introduced the world's first self-propelled, riding lawn tractor in 1922, known as the "Triplex". [8] [9] The roller-drive lawn mower has changed very little since around 1930. Gang mowers, those with multiple sets of blades to cut a wider swath, were built in the United States in 1919 by the Worthington Mower Company.

5. Wheel Horse - Wikipedia

   en.wikipedia.org/wiki/Wheel_Horse

   There were eleven models in four lines of lawn and garden tractors by 1974: the 8 hp (6.0 kW) "economy" A Series with standard 32-inch mower and electric or recoil start, the "compact" B Series with a four-speed or automatic transmission, the C Series offering four models (the C-120 and C-160 automatic, and the C-100 and C-160 8-speed and the ...

6. Front-wheel drive - Wikipedia

   en.wikipedia.org/wiki/Front-wheel_drive

   Front-wheel drive (FWD) is a form of engine and transmission layout used in motor vehicles, in which the engine drives the front wheels only. Most modern front-wheel-drive vehicles feature a transverse engine, rather than the conventional longitudinal engine arrangement generally found in rear-wheel-drive and four-wheel-drive vehicles.

7. Flywheel energy storage - Wikipedia

   en.wikipedia.org/wiki/Flywheel_energy_storage

   NASA G2 flywheel. Flywheel energy storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as rotational energy.When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the ...