Airship

An airship or dirigible is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power. Aerostats gain their lift from large gas bags filled with a lifting gas that is less dense than the surrounding air.

In early dirigibles, the lifting gas used was hydrogen, due to its high lifting capacity and ready availability. Helium gas has almost the same lifting capacity and is not flammable, unlike hydrogen, but is rare and relatively expensive. Significant amounts were first discovered in the United States and for a while helium was only used for airships by the United States. Most airships built since the 1960s have used helium, though some have used hot air.

The envelope of an airship may form a single gas bag, or may contain a number of internal gas-filled cells. An airship also has engines and crew and/or payload accommodation, typically housed in one or more "gondolas" suspended below the envelope.

The main types of airship are non-rigid, semi-rigid, and rigid. Non-rigid airships, often called "blimps", rely on internal pressure to maintain the shape of the airship. Semi-rigid airships maintain the envelope shape by internal pressure, but have some form of supporting structure, such as a fixed keel, attached to it. Rigid airships have an outer structural framework which maintains the shape and carries all structural loads, while the lifting gas is contained in one or more internal gas bags or cells. Rigid airships were first flown by Count Zeppelin and the vast majority of rigid airships built were manufactured by the firm he founded. As a result, all rigid airships are sometimes called zeppelins.

Airship (disambiguation)

An airship or dirigible is an aerostat (lighter than air aircraft) that can be steered and propelled through the air using propellers, rudders, or other thrust mechanisms.

See also

Eberron

Eberron is a campaign setting for the Dungeons & Dragons (D&D) role-playing game, set in a period after a vast destructive war on the continent of Khorvaire. Eberron is designed to accommodate traditional D&D elements and races within a differently toned setting; Eberron combines a fantasy tone with pulp and dark adventure elements, and some non-traditional fantasy technologies such as trains, skyships, and mechanical beings which are all powered by magic.

Eberron was created by author and game designer Keith Baker as the winning entry for Wizards of the Coast's Fantasy Setting Search, a competition run in 2002 to establish a new setting for the D&D game. Eberron was chosen from more than 11,000 entries, and was officially released with the publication of the Eberron Campaign Setting hardback book in June 2004. The campaign setting book was written by Baker, Bill Slavicsek, and James Wyatt.

In June 2005, the Eberron Campaign Setting book won the Origins Award for Best Roleplaying Game Supplement of 2004.

R29

R29 or R-29 may refer to:

R29 (New York City Subway car)

The R29 was a New York City Subway car built in 1962 by the St. Louis Car Company for the IRT division (also known as the A Division). They have very similar appearances to the R26 and R28 fleets with the exceptions that they were built by a different company and permanently paired with link bars, instead of couplers. These were also the first subway cars to feature a bright red paint scheme. Four cars (8686, 8687, 8804 and 8805) were tested with G70 trucks. Use of these trucks was discontinued in 1970.

The first set of R29s debuted on the 7 service on April 28, 1962. After initial in-service testing, the first set of R29s (#8570-8579) operated on 7 service as a special 10-car train on April 29, 1962. On May 1 of that year, it was transferred to the 1 service. The original intention was to assign all of these cars to the 7 service, while transferring their existing R12 and R14 cars to the mainline IRT services to begin replacing their existing Low-Voltage cars, many of which were approaching 50 years of age at the time. However, it was decided to order the new R33 Worlds Fair single cars along with the new R36 Worlds Fair married pair cars to completely re-equip the 7 service in time for the new 1964-5 Worlds Fair exhibition in Flushing instead. The new R33 Worlds Fair singles cars and the R36 Worlds Fair married pair cars were also ordered during 1962.

R29 road

The R29 is a provincial route in South Africa that connects Johannesburg with Leandra via Germiston, Benoni, Boksburg and Springs. For much of its route it is named Main Reef Road. The R29 used to end near the [Golela] border post, however the section from Leandra to Ermelo is now part of the N17. From Ermelo to the border post is now part of the N2

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