| SSZ class | |
|---|---|
 | |
| General information | |
| Type | Patrol airship |
| National origin | United Kingdom |
| Primary user | Royal Navy |
| Number built | 77 |
| History | |
| First flight | 1916 |
The SSZ (Sea Scout Zero) non-rigid airships or "blimps" were developed in United Kingdom during World War I from the earlier SS ("Sea Scout") class. The main role of these craft was to escort convoys and scout or search for German U-boats. A secondary purpose was to detect and destroy mines. [1]
The SSZ was built at the Royal Naval Air Service (RNAS) airship station at Capel-le-Ferne [2] near Folkestone to the design of three officers that were serving there [3] as a successor to the SS class. [4]
Similar to other SS class types, the SSZs had an envelope of 70,000 cu ft (2,000 m3) capacity containing two ballonets of 6,375 cu ft (180.5 m3) each; [5] and like the SSPs, the fuel was contained in aluminium tanks slung on the axis of the envelope. [6]
The design of the car was a departure from that of other SS types. It was streamlined, boat-shaped and watertight, was floored from end-to-end, and was enclosed with sides of fabric-covered 8-ply wood [3] or aluminium. The car was comfortable and accommodated a 3-man crew – the forward position being occupied by the wireless operator/gunner with the pilot seated amidships, and the engineer was stationed at the rear. [6]
A single water-cooled 75 hp (56 kW) Rolls-Royce Hawk engine was mounted on bearers above the level of the rear of the car, and drove a 9 ft (2.7 m) diameter four-bladed propeller in pusher configuration. [6]
The SSZ design was judged superior to the SSP, which had been developed at RNAS Kingsnorth at the same time, and so the SSP was cancelled. [4]
The SSZ's patrolled extensively from late 1917 to late 1918. The average patrol lasted eight hours, but there were instances of flights of much greater duration – three of 25–26 hours; one of 30 h 20 min; and a record of 50 h 55 min held by SSZ.39 in the summer of 1918. [6] After the Armistice SSZ-73 became the only airship to fly under a bridge. Maj. Thomas Elmhirst (CO RNAS Anglesey), piloted SSZ-73 under the Menai Suspension Bridge. The act did not harm Elmhurst's career. [7]
On 16 August 1918, a makeshift SSZ ship was being assembled from the old SSZ-23 envelope and a spare SS Zero car at RNAS Howden airship station. [8] Petrol fumes from a spillage in the car were ignited some time later by a spark when the radio equipment was being tested, and the ensuing fireball, fed by fuel and gas, completely enveloped and destroyed the old SSZ-23 envelope/spare car hybrid and R23X class airship R27 which were sharing a hangar. [8] Although the hangar itself survived, one airman lost his life, and two further blimps that were moored nearby, SSZ.38 and SSZ.54, were also destroyed. [9]
The SSZ's greater stability in flight and longer endurance enabled them to operate in worse weather conditions than had previously been attempted, [6] and early in 1917 all existing SS types were superseded by the SS Zero. [2] They were turned out as fast as they could be built, and a total of 77 SSZs were produced between 1916 and 1918, two of which were acquired by France and two by the United States. [5] The US Navy operated two SSZ's. SSZ-23 (A-1030), and SSZ-24 (A-1029), the SSZ-23 envelope was destroyed in a hangar fire Howden in 1918, SSZ-23 the car was sent from Howden to the US on 4 August 1918. [10] SSZ-24 apparently burned at Hampton Roads in the summer of 1918. [11] The SSZ-23 was at Cape May, NJ, for erection on 5 February 1919. The SSZ-23 was withdrawn by mid-1920. [12]
Data from [5]
General characteristics
Performance
Armament
A non-rigid airship, commonly called a blimp (/blɪmp/), 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. Blimps are known for their use in advertising, surveillance, and as observation platforms due to their maneuverability and steady flight capabilities.
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 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.
Beginning in 1908 and ending in 1937, the U.S. Army established a program to operate airships. With the exceptions of the Italian-built Roma and the Goodyear RS-1, which were both semi-rigid, all Army airships were non-rigid blimps. These airships were used primarily for search and patrol operations in support of coastal fortifications and border patrol. During the 1920s, the Army operated many more blimps than the U.S. Navy. Blimps were selected by the Army because they were not seen as "threats" on the battlefield by opposing forces, unlike airplanes, due to their passive role in combat.
The B class blimps were patrol airships operated by the United States Navy during and shortly after World War I. The Navy had learned a great deal from the DN-1 fiasco. The result was the very successful B-type airships. Dr. Jerome Hunsaker was asked to develop a theory of airship design, Lt. John H. Towers had returned from Europe having inspected British designs, and using reports from attachés on British airship operations, the Navy was prepared to seek bids for blimps from American manufacturers. On 4 February 1917 the Secretary of the Navy directed that 16 nonrigid airships of Class B be procured. A February 12, 1917 meeting with the Chief of the Bureau of Construction and Repair, and representatives of Goodyear, Goodrich, Connecticut Aircraft Company, Curtiss Aeroplane and Motor Corporation, and U.S. Rubber Company, it was agreed that the order for 16 dirigibles was beyond the capability of any one company. The conference resulted in a committee to coordinate on sharing raw materials, information and experience. Ultimately Goodyear manufactured 9 envelopes, Goodrich made 5 and Curtiss assembled the gondolas for all of those 14 ships. Connecticut Aircraft contracted with U.S. Rubber for its two envelopes and with Pigeon Fraser for its gondolas. The Curtiss-built gondolas used by Goodyear and Goodrich used modified Curtiss JN-4 fuselages powered by Curtiss OXX engines. The Connecticut Aircraft blimps were powered by Hall-Scott engines. One ship, B-20 was equipped with a special control car. All B-Class airships were delivered to the Navy between August 1917 (B-1) and September 1918 (B-20).
The C-class blimp was a patrol airship developed by the US Navy near the end of World War I, a systematic improvement upon the B-type which was suitable for training, but of limited value for patrol work. Larger than the B-class, the C-class blimps had two motors and a longer endurance. As with the B-class, 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 easier 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 redesigned control car by Leroy Grumman who later founded the Grumman Aircraft Engineering Corporation.
The E class of US Navy blimps comprised a single airship, built during World War I by Goodyear as one of a group of three small blimps offered to the US government. Two were purchased for the US Navy and one for the US Army. The Navy blimps were designated E-1, F-1, and the Army airship A-1. These airships had identical envelopes but different cars. The E-1 was delivered to Pensacola, Florida in December 1918. It was flown only at Pensacola serving as a trainer at the Airship School. A new envelope was provided in December 1920. E-1 was retired from service sometime in 1924.
The F class of US Navy blimps comprised a single airship, built during World War I by Goodyear as one of a group of three small blimps offered to the US government. Two were purchased for the US Navy and one for the US Army. The Navy blimps were designated E-1, F-1, and the Army airship A-1. Classified as an "Experimental Engine Testing Dirigible." F-1 had the same envelope size as the E-1, due to the use of a tractor mounted 125 hp Union engine, the performance was different. F-1 spent its entire career at Hampton Roads. It was flown in both tractor and pusher configurations. It also may have been flown with a Curtiss OXX engine. F-1 was removed from inventory in November 1923.
The H class blimp was an observation airship built for the U.S. Navy in the early 1920s. The original "H" Class design of 1919 was for a twin engined airship of approximately 80,000 cubic feet volume. Commander Lewis Maxfield suggested that a small airship which could be used either as a tethered kite balloon, or be towed by a ship until releasing its cable, would be able to scout on its own. The concept was an airship similar to the later Army Motorized Kite Balloons.
The K-1 was an experimental blimp designed by the United States Navy in 1929. The K-1 was not the prototype of the later K-class blimps.
During the First World War, the United States Navy trained crews at British bases, and operated British designed and built blimps on combat patrols. The Navy purchased three types of British blimps. Operations were flown in a US SSZ and airships operated by the Royal Navy.
The British R.23X class of rigid airships were developed during World War I using the experience gained from the 23 class, but only two of the planned four R.23X class were built: R.27 and R.29. Both were completed mid-1918, but just 2+1⁄2 months after entering service R.27 was destroyed by fire in a hangar; while R.29 went on to become the most successful British wartime rigid airship, being the only one to meet enemy action, as well as the only one to sink a submarine.
SSclass airships were simple, cheap and easily assembled small non-rigid airships or "blimps" that were developed as a matter of some urgency to counter the German U-boat threat to British shipping during World War I. A secondary purpose was to detect and destroy mines. The class proved to be versatile and effective, with a total of 158 being built in several versions.
The SSP were a class of Royal Navy non-rigid airship or "blimp" developed by the United Kingdom during World War I as a successor to the earlier SS class airship. Found to be inferior to a parallel development, the Submarine Scout Zero non-rigid, only a few were built. The main role of these craft was to escort convoys and scout or search for German U-boats.
The SST class of non-rigid airship or "blimp" was developed in Great Britain during World War I from the earlier SS class airship. The main role of these craft was to escort convoys and scout or search for German U-boats. A secondary purpose was to detect and destroy mines.
The British NSclass non-rigid airships were the largest and last in a succession of "blimps" that served with the Royal Naval Air Service during World War I; developed from experiences gained with earlier classes to operate off the east coast of Britain on long-range patrols. Despite early problems, examples of the class went on to break all flying records for non-rigid airships, and the type became regarded as the most efficient of its kind.
RNAS Capel was a First World War airship station near Folkestone, Kent.
