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To increase the hobby's accessibility, some vendors offer Almost Ready to Fly (ARF) models that minimize the skills required, and reduce build time to under 4 hours, versus 10–40 or more for a traditional kit. Ready To Fly (RTF) radio control aircraft are also available, however model building remains integral to the hobby for many. For a ...
A slingshot or catapult is a small hand-powered projectile weapon. The classic form consists of a Y-shaped frame, with two tubes or strips made from either a natural rubber or synthetic elastic material. These are attached to the upper two ends. The other ends of the strips lead back to a pouch that holds the projectile. One hand holds the ...
Basic diagram of an onager, a type of catapult. A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. [1] A catapult uses the sudden release of stored potential energy to propel its payload.
The EMALS uses a linear induction motor (LIM), which uses alternating current (AC) to generate magnetic fields that propel a carriage along a track to launch the aircraft. [5] [6] The EMALS consists of four main elements: [7] The linear induction motor consists of a row of stator coils with the same function as the circular stator coils in a conventional induction motor.
The catapult used on aircraft carriers consists of a track or slot built into the flight deck, below which is a large piston or shuttle that is attached through the track to the nose gear of the aircraft, or in some cases a wire rope, called a catapult bridle, is attached to the aircraft and the catapult shuttle.
HMS Argus showing the full-length flight deck from bow to stern ROKS Dokdo's full length flight deck The first aircraft carrier that began to show the configuration of the modern vessel was the converted liner HMS Argus, which had a large flat wooden deck added over the entire length of the hull, giving a combined landing and take-off deck unobstructed by superstructure turbulence.
Historical accounts, for instance, cited that Philip II employed a group of engineers within his army to design and build catapults for his military campaigns. [4] [5] There is even a claim that it was Philip II with his team of engineers who invented the ballista after improving Dionysius's device, which was merely an oversized slingshot. [6]
Crossbows and Catapults, also known as Battlegrounds, is a game of physical skill first released in 1983. It has since been published by several different game publishers including Lakeside, Alga , Base Toys, Tomy and currently Moose Toys (under the name Battlegrounds Crossbows and Catapults). In the game, two sides, originally Vikings and ...