Inflatable boat

An inflatable boat is a lightweight boat constructed with its sides and bow made of flexible tubes containing pressurised gas. For smaller boats, the floor and hull is often flexible, while for boats longer than , the floor typically consists of three to five rigid plywood or aluminium sheets fixed between the tubes, but not joined rigidly together. Often the transom is rigid, providing a location and structure for mounting an outboard motor. Some inflatable boats can be disassembled and packed into a small volume, so that they can be easily stored and transported. The boat, when inflated, is kept rigid cross-ways by a foldable removable thwart. This feature makes these boats suitable for liferafts for larger boats or aircraft, and for travel or recreational purposes. There are ancient carved images of animal skins filled with air being used as one-man floats to cross rivers. These floats were inflated by mouth. The discovery of the process to vulcanize rubber was made by Charles Goodyear in 1838, and was granted a US patent in 1844. Vulcanization stabilized the rubber, making it durable and flexible. In late 1843, Thomas Hancock filed for a UK patent, which was also granted in 1844, after the Goodyear Tire and Rubber Company patent had been granted. In 1852, while traveling in England, Charles Goodyear discovered that Thomas Hancock's company was producing vulcanized rubber and sued. Thomas Hancock had been shown a sample of Goodyear's rubber in 1842, but had not been told the process that made it—and Hancock said he had developed his process independently. The last of the suits were settled in 1855. Shortly thereafter, several people expanded on experimentation of rubber coated fabrics. In 1839 the Duke of Wellington tested the first inflatable pontoons. In 1840, the English scientist Thomas Hancock designed inflatable craft using his new methods of rubber vulcanization and described his achievements in The Origin and Progress of India Rubber Manufacture in England published a few years later.

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Related concepts (4)

Lifeboat (shipboard)

A lifeboat or liferaft is a small, rigid or inflatable boat carried for emergency evacuation in the event of a disaster aboard a ship. Lifeboat drills are required by law on larger commercial ships. Rafts (liferafts) are also used. In the military, a lifeboat may double as a whaleboat, dinghy, or gig. The ship's tenders of cruise ships often double as lifeboats. Recreational sailors usually carry inflatable liferafts, though a few prefer small proactive lifeboats that are harder to sink and can be sailed to safety.

Special forces

Special forces or special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equipped forces using unconventional techniques and modes of employment". Special forces emerged in the early 20th century, with a significant growth in the field during World War II, when "every major army involved in the fighting" created formations devoted to special operations behind enemy lines.

Outboard motor

An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorised method of propelling small watercraft. As well as providing propulsion, outboards provide steering control, as they are designed to pivot over their mountings and thus control the direction of thrust. The skeg also acts as a rudder when the engine is not running.