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A blimp, or non-rigid airship, is an airship (dirigible) without an internal structural framework or a keel. Unlike semi-rigid and rigid airships, blimps rely on the pressure of the lifting gas inside the envelope and the strength of the envelope itself to maintain their shape.
An airship, dirigible balloon or blimp 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 a lifting gas that is less dense than the surrounding air.
The Zeppelin NT is a class of helium-filled airships being manufactured since the 1990s by the German company Zeppelin Luftschifftechnik GmbH (ZLT) in Friedrichshafen. The initial model is the NT07. The company considers itself the successor of the companies founded by Ferdinand von Zeppelin which constructed and operated the very successful Zeppelin airships in the first third of the 20th century. There are, however, a number of notable differences between the Zeppelin NT and original Zeppelins as well as between the Zeppelin NT and usual non-rigid airships known as blimps. The Zeppelin NT is classified as a semi-rigid airship.
The R.33 class of British rigid airships were built for the Royal Naval Air Service during the First World War, but were not completed until after the end of hostilities, by which time the RNAS had become part of the Royal Air Force. The lead ship, R.33, served successfully for ten years and survived one of the most alarming and heroic incidents in airship history when she was torn from her mooring mast in a gale. She was called a "Pulham Pig" by the locals, as the blimps based there had been, and is immortalised in the village sign for Pulham St Mary. The only other airship in the class, R.34, became the first aircraft to make an east to west transatlantic flight in July 1919 and, with the return flight made the first two-way crossing. It was decommissioned two years later, after being damaged during a storm. The crew nicknamed her "Tiny".
The K-class blimp was a class of blimps built by the Goodyear Aircraft Company of Akron, Ohio for the United States Navy. These blimps were powered by two Pratt & Whitney Wasp nine-cylinder radial air-cooled engines, each mounted on twin-strut outriggers, one per side of the control car that hung under the envelope. Before and during World War II, 134 K-class blimps were built and configured for patrol and anti-submarine warfare operations, and were extensively used in the Navy’s anti-submarine efforts in the Atlantic and Pacific Ocean areas.
The G-Class Blimps were a series of non-rigid airships (blimps) used by the United States Navy. In 1935, instead of developing a new design airship, the Navy purchased the Goodyear Blimp Defender for use as a trainer and utility airship assigning it the designator G-1. Defender was built by the Goodyear Aircraft Company of Akron, Ohio and was the largest blimp in the company’s fleet of airships that were used for advertising and as passenger airships. Goodyear built additional G-class airships for the Navy during World War II to support training needs.
The L class blimps were training airships operated by the United States Navy during World War II. In the mid-1930s, the Goodyear Aircraft Company built a family of small non-rigid airships that the company used for advertising the Goodyear name. In 1937 the United States Navy awarded a contract for two different airships, K class blimp designated K-2 and a smaller blimp based upon Goodyear's smaller commercial model airship used for advertising and passenger carrying. The smaller blimp was designated by the Navy as L-1 The L-1 was delivered in April 1938 and operated from the Navy's lighter-than-air facility at Lakehurst, New Jersey. In the meantime, the Navy ordered two more L-Class blimps, the L-2 and L-3, on September 25, 1940. These were delivered in 1941. L-2 was lost in a nighttime mid-air collision with the G-1 on June 8, 1942.
The J-class blimps were non-rigid airships designed by the Navy Bureau of Aeronautics and Goodyear Tire & Rubber Company in the early 1920s for the US Navy.
The Goodyear Aircraft Company of Akron, Ohio built the M-class blimp for the US Navy as the follow-on to the K-class anti-submarine warfare blimp used during World War II. It was a significantly larger airship, 50% larger than its predecessor. Four airships, designated M-1 through M-4, were delivered in early 1944. Operations of K-ships in tropical regions had shown a need for a blimp with greater volume to offset the loss of lift due to high ambient temperatures.
The C-class blimp was a patrol airship developed by the US Navy shortly after World War I, a systematic improvement upon the B-type which was very suitable for training, but of limited value for patrol work. Larger than the B-class, these blimps had two motors and a longer endurance. Once again, the envelope production was split between Goodyear and Goodrich, with control cars being built by the Burgess division of Curtiss Aeroplane and Motor Company. Originally the Navy ordered 30 but reduced the number to 10 after the armistice in November 1918. All ten of the "C" type airships were delivered in late 1918, and examples served at all of the Navy's airship stations from 1918 to 1922. In 1921 the C-7 was the first airship ever to be inflated with helium. The Navy decommissioned its last two remaining C-type blimps, the C-7 and C-9 in 1922.
The D class blimp was a patrol airship used by the US Navy in the early 1920s. The D-type blimps were slightly larger than the C-type and had many detail improvements. The Navy continued the practice of dividing the envelope production between Goodyear and Goodrich. The control cars were manufactured by the Naval Aircraft Factory. The major improvements over the C-type blimps were a better control car design and easier, more reliable controls and instrumentation. The engines were moved to the rear to reduce noise and allow better communications between crew members. The fuel tanks were suspended from the sides of the envelope. The envelope was identical to the C-type, except an additional six-foot panel was inserted for a total length of 198 feet (60 m) and a volume of 190,000 cubic feet (5,400 m3). The last of the D-Class, D-6, had a different control car designed by Leroy Grumman who later founded the Grumman Aircraft Engineering Corporation.
The K-1 was an experimental blimp designed by the United States Navy in 1929. Due to the inability to get Congressional approval for the construction of an airship the navy used the ploy of ordering a "universal" control car which could be used on the J-type airships from the Naval Aircraft Factory. An order was placed with Goodyear Tire and Rubber Company for an envelope to hold "experimental gases". To complete the deception, there is no record of the US Navy assigning a serial number to the K-1, Standard Army TC type tail fins were procured from Goodyear. Unlike past Navy blimps, the control car was not suspended from external cables, but was hung from cables attached to the top of the envelope, and the car was carried flush against the envelope as in modern blimps. The control car carried bunks and a galley so that a relief crew could be carried, and was completely enclosed. The K-1 was also the first Navy blimp to have a taxi wheel. Like the Graf Zeppelin, the fuel for the K-1 was "blau gas" a mixture of combustible gases with the same density as air, which meant that the valving of gas as the fuel was consumed was not necessary. The only serious drawback was the tendency of the fuel to leak into the helium which then could not be run through the Lakehurst purification plant, which meant the expensive helium had to be vented to atmosphere when too contaminated or an overhaul was necessary.
The Goodyear GZ-20 was a blimp class introduced in 1969 in the United States by Goodyear as its signature promotional aircraft, the Goodyear Blimp. The design is a development of the GZ-19 class, featuring a larger envelope to carry the "Super-Skytacular" night sign and more powerful engines. The GZ-20s were the mainstay of Goodyear's airship fleet until 2017, when they were replaced with the Zeppelin NT semi-rigid airship.
The Coastal Class were a class of non-rigid airship or "blimp" used by the Royal Naval Air Service (RNAS) during World War I. The C-class blimp operated by the United States Navy after the war was a completely unrelated design. In total 35 Coastals were built, all at RNAS Kingsnorth, Kent. Entering service in 1916, the Coastal class remained in widespread service until 1918, with a few members of the class still in service at the signing of the Armistice, while others were replaced by the improved C-Star class as they became unfit for service. The blimps were used for long anti-submarine patrols in the Western Approaches and English Channel, protecting convoys from German U-boats. The Coastal class was one of the first aircraft types specifically designed to detect and attack submarines.
The two Hindenburg-class airships were hydrogen-filled, passenger-carrying rigid airships built in Germany in the 1930s and named in honor of Paul von Hindenburg. They were the last such aircraft ever built, and in terms of their length and volume, the largest Zeppelins ever to fly. During the 1930s, airships like the Hindenburg class were widely considered the future of air travel, and the lead ship of the class, LZ 129 Hindenburg, established a regular transatlantic service. The destruction of this ship in a highly publicized accident was to prove the death knell for these expectations. The second ship, LZ 130 Graf Zeppelin, was never operated on a regular passenger service, and was scrapped in 1940 by order of Hermann Göring.
His Majesty's Airship No. 1 was designed and built by Vickers, Sons and Maxim at their works in Barrow-in-Furness, Lancashire, England, as an aerial scout airship for the Royal Navy. It was the first British rigid airship to be built, and was constructed in a direct attempt to compete with the German airship programme. Often referred to as "Mayfly", a nickname given to it by the lower deck, in public records it is designated ‘HMA Hermione’ because the naval contingent at Barrow were attached to HMS Hermione, a cruiser moored locally preparing to act as its tender.
A mooring mast, or mooring tower, is a structure designed to allow for the docking of an airship outside of an airship hangar or similar structure. More specifically, a mooring mast is a mast or tower that contains a fitting on its top that allows for the bow of the airship to attach its mooring line to the structure. When it is not necessary or convenient to put an airship into its hangar between flights, airships can be moored on the surface of land or water, in the air to one or more wires, or to a mooring mast. After their development mooring masts became the standard approach to mooring airships as considerable manhandling was avoided.
The Loral GZ-22 was a class of non-rigid airship, or blimp first flown in 1989 and operated by Goodyear as its flagship promotional aircraft, with civil registration N4A and christened Spirit of Akron. This was the only airship of this class ever built. Goodyear originally designed the GZ-22 to demonstrate the possible renewed use of airships to the United States Navy, which had ended their airship operations in 1962. The GZ-22 was designed by Goodyear, but built by Loral after Goodyear sold its aerospace division to Loral in 1987. The GZ-22 had a steel-framed, composite-skinned gondola under a neoprene-impregnated polyester 2-ply envelope, inflated with helium. At its launch in 1987, the 205-foot 6-inch long Spirit of Akron was the longest airship in service at that time. The GZ-22 Type Certificate was issued on 31 August 1989.
Airship Industries was a British manufacturers of modern non-rigid airships (blimps) active under that name from 1970 to 1990 and controlled for part of that time by Alan Bond. The first company, Aerospace Developments, was founded in 1970, and a successor, Hybrid Air Vehicles, remains active as of 2018. Airship Industries itself was active between 1980 and 1990.
The Skyship 500 is a non-rigid airship designed and built in the United Kingdom during the 1980s.
References
- Notes
- ↑ "The Goodyear "Pilgrim" Airship". Flight : 270. 6 May 1926. Retrieved 2008-04-03.CS1 maint: discouraged parameter (link)
- Bibliography
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 425.
- "The Goodyear "Pilgrim" Airship". Flight : 270. 6 May 1926. Retrieved 2008-04-03.CS1 maint: discouraged parameter (link)
- Goodyear "Pilgrim" Gondola – National Air and Space Museum