Sikorsky Aircraft

Sikorsky Aircraft
Company type	Subsidiary
Industry	Aerospace, defense
Founded	March 5, 1923; 103 years ago in Roosevelt Field, New York, United States
Founder	Igor Sikorsky
Headquarters	Stratford, Connecticut, United States
Area served	Worldwide
Key people	Richard Benton (President)
Products	Helicopters, seaplanes, surface transportation vehicles (trains, boats)
Number of employees	16,000
Parent	Lockheed Martin

Sikorsky Aircraft is an American aircraft manufacturer headquartered in Stratford, Connecticut. Established in 1923 by aviation innovator Igor Sikorsky, the firm emerged as a prominent producer of helicopters serving both military and civilian sectors. Its range of products also extended to seaplanes and various surface transportation vehicles, including trains and boats.

Originally functioning as a division of United Technologies Corporation, Sikorsky was acquired by Lockheed Martin in November 2015. The company employs around 16,000 individuals and operates internationally through subsidiaries such as PZL Mielec and the joint venture Tata–Sikorsky Aerospace Limited with Tata Advanced Systems. Richard Benton serves as President, guiding strategic direction and business expansion within the aerospace and defense arenas.

History

The Sikorsky Aero Engineering Corporation was established on March 5, 1923, near Roosevelt Field, New York, by Kyiv-born immigrant Igor Sikorsky. Two years later, in 1925, it was renamed Sikorsky Manufacturing Company. Following the commercial success of the S-38 aircraft, the company reorganized as Sikorsky Aviation Corporation, securing $5 million in capital to construct a modern facility in Stratford, Connecticut. In 1929, the company relocated to Stratford and became part of United Aircraft and Transport Corporation, which later evolved into United Technologies Corporation (UTC).

Initially, Igor Sikorsky concentrated on designing multiengine landplanes and amphibious aircraft. After experiencing a downturn in sales during the late 1930s and merging with Vought Aircraft, he developed the VS-300 helicopter followed by the R-4 model—the first production single-rotor helicopter to achieve stable flight in 1942—laying the groundwork for contemporary helicopter design.

Sikorsky has maintained its position as a leading helicopter manufacturer, producing notable models such as the UH-60 Black Hawk and SH-60 Seahawk, alongside experimental aircraft like the S-72. Since 1957, the company has been responsible for manufacturing helicopters for the U.S. Presidential fleet, currently utilizing VH-3 and VH-60 variants.

In 1998, Sikorsky expanded by acquiring Helicopter Support Inc. (HSI), which manages aftermarket parts distribution and repair services for non-U.S. government customers. In 2004, UTC purchased Schweizer Aircraft Corp., integrating it into Sikorsky; Schweizer specializes in small helicopters, UAVs, gliders, and light aircraft, complementing Sikorsky’s portfolio. That same year, Sikorsky acquired Keystone Helicopter Corporation to strengthen maintenance services for its S-76 and S-92 models.

The year 2007 marked the opening of Hawk Works—a Rapid Prototyping and Military Derivatives Completion Center located in Big Flats, New York. Additionally, Sikorsky acquired Poland’s PZL Mielec facility to assemble S-70i helicopters targeting global markets.

In February 2009, Sikorsky Global Helicopters was launched as a dedicated business unit focusing on commercial helicopter production and sales; it merged Sikorsky’s civil helicopter lines with Schweizer’s operations and was headquartered in Coatesville, Pennsylvania until 2022.

Between 2011 and 2012, following workforce reductions totaling nearly 1,000 employees, Sikorsky shut down its Hawk Works plant and transferred military completion activities to West Palm Beach, Florida; commercial manufacturing had previously been relocated to Coatesville.

The primary manufacturing site and corporate headquarters remain in Stratford, Connecticut. Additional facilities are situated in Trumbull, Shelton, Bridgeport (all within Connecticut), Fort Worth (Texas), West Palm Beach (Florida), Huntsville and Troy (Alabama), along with international subsidiaries.

In 2023, Sikorsky marked its centennial anniversary, celebrating a hundred years of pioneering advancements and leadership within the aerospace sector.

Acquisition

In 2015, United Technologies Corporation (UTC) assessed Sikorsky as less profitable relative to its other subsidiaries and considered a spin-off option to circumvent the tax implications of a direct sale. On July 20, 2015, Lockheed Martin reached an agreement to purchase Sikorsky from UTC for $9 billion. This acquisition required clearance from regulatory bodies across eight different regions, which was secured by November 2015. The deal was finalized on November 6, 2015, signifying a major transformation in Sikorsky’s ownership and broadening Lockheed Martin’s aerospace and defense portfolio.

AHS Sikorsky Prize

The American Helicopter Society International introduced an award in 1980 for achieving the first human-powered helicopter flight that fulfilled certain conditions. In 2010, Sikorsky Aircraft elevated its sponsorship contribution to $250,000. Engineers Dr. Todd Reichert and Cameron Robertson from Canada, collaborating with the University of Toronto team, created the AeroVelo Atlas—recognized as the largest human-powered helicopter globally. Its successful flight lasting 64 seconds in August 2012 earned the prize in June 2013, exemplifying innovation consistent with Sikorsky’s heritage in rotorcraft engineering.

Products

Sikorsky assigns most of its models S-numbers; designs S-1 through S-27 were developed by founder Igor Sikorsky before his departure from the Russian Empire. Subsequent models, particularly helicopters, often received multiple military designations reflecting their roles (such as UH, SH, MH), frequently differing only slightly in equipment. Additionally, some aircraft underwent further modifications either by Sikorsky or other manufacturers, resulting in numerous variants.

Airplanes

Sikorsky S-28: planned four-engine biplane airliner accommodating 32 passengers; marked Sikorsky’s initial American design (1919)
Sikorsky S-29-A: twin-engine cargo biplane; first Sikorsky aircraft constructed in the United States (1924)
Sikorsky S-38: eight-seat sesquiplane flying boat with two engines (US Navy PS) (1928–1933)
Sikorsky S-40: four-engine monoplane flying boat seating 28 passengers (1931)
Sikorsky S-42 "Clipper": four-engine flying boat produced between 1934 and 1935
Sikorsky S-43 "Baby Clipper": smaller twin-engine amphibious flying boat, produced from 1935 to 1937; a reduced-size version of the S-42
Sikorsky VS-44 "Excalibur": four-engine flying boat introduced in 1937

Helicopters, production

Model	Designation	From	Until	MTOW (lb, t)		Notes
S-47	R-4	1942	1944	2,581	1.17	First helicopter produced for mass use worldwide
S-48/S-51	R-5/H-5	1944	1952	4,825	2.19	Enhanced capacity and performance compared to R-4
S-55	H-19 Chickasaw	1949		7,500	3.41	Utility helicopter accommodating ten passengers
S-58	H-34 Choctaw	1954	1970	14,000	6.35	Larger utility helicopter featuring ASW and VIP configurations
S-61	SH-3 Sea King	1959	1970s	22,050	10	Medium-lift transport platform with ASW and SAR capabilities
S-64 Skycrane	CH-54 Tarhe	1962		42,000–47,000	19.05–21	Heavy-lift “flying crane” designed for US Army transport operations
S-65	CH-53 Sea Stallion/MH-53	1964	late 1970s/1980s	up to 46,000	~21	Medium to heavy-lift transport and extended-range SAR missions
S-70 series	UH-60/SH-60/HH-60 variants	1974	present	~22,000–23,500	~10	Twin-turbine medium transport/utility helicopter; foundational platform for US Army and Navy with numerous variants
S-76	Commercial helicopter	1977	present	11,700	5.31	Twin turbine commercial model seating fourteen passengers
S-80	CH-53E Super Stallion	1974	1980s	73,500	33.3	Heavy-lift export version derived from CH-53 series
S-92	H-92 Superhawk/CH-148 Cyclone	1998	present	27,700–28,650	12.6–13	Twin-turbine medium-lift helicopter evolved from the S-70 for civil and military use
S-95	Sikorsky CH-53K King Stallion	2018	present	84,700	38.4	Latest heavy-lift iteration within the CH-53 family

The extensive lineup of helicopters highlights Sikorsky’s global competitive edge by offering a wide variety of models tailored to both military and commercial sectors. This broad product range underpins the company’s expansion and strengthens its position in worldwide rotorcraft manufacturing markets.

Helicopters and Prototype Models

Model	Designation	Year	MTOW (lb, t)		Remarks
S-46	VS-300	1939	1,150	0.52	first American helicopter featuring a single main rotor
S-50					intended as a compact helicopter; only a wooden mockup was produced
S-53	XHJS-1	1947			naval utility model; two prototypes constructed
S-54		1948			R-4B variant adapted to a "sesqui-tandem" rotor layout
S-59	XH-39	1953	3,361	1.53	two H-18 helicopters converted to turbine power; one prototype built
Sikorsky S-60		1959	21,000	9.5	prototype "flying crane" derived from CH-37; crashed in 1961
S-67	Blackhawk	1970	24,272	11	attack helicopter prototype; precursor to S-66 AAFSS contender
Sikorsky S-68					proposed modification of S-58T; no units constructed
Sikorsky S-69		1973	12,500	5.7	jet-powered compound helicopter prototype with coaxial rotors
Sikorsky S-71	AAH				entry for the US Army Advanced Attack Helicopter program utilizing S-70 parts
Sikorsky S-72		1976	26,047	11.8	experimental NASA jet hybrid aircraft
Sikorsky S-73	HLH		118,000	53.5	US Army's Heavy Lift Helicopter competition entry
Sikorsky S-75		1984	8,470	3.82	advanced Composite Airframe Program with two prototypes developed
S-78-20 & S-78-29	1975	17,520 (-20) 19,997 (-29)	7.95 (-20) 9.07 (-29)	commercial adaptations of the S-70 in both 20 and enlarged 29-seat configurations; never realized
Sikorsky S-97 Raider	AAS	2015	11,000	4.99	proposed compound helicopter for the US Army Armed Aerial Scout role
S-100	SB>1 Defiant	2019			compound helicopter featuring rigid coaxial rotors for the Future Long-Range Assault Aircraft program by the US Army
Sikorsky Raider X	Raider X	2023			compound helicopter designed for the Future Attack Reconnaissance Aircraft competition by the US Army
S-103	Defiant X			compound helicopter developed for the US Army's Future Long-Range Assault Aircraft contest
Sikorsky Firefly					electric-powered version of the S-300 unveiled in 2010
Sikorsky X2		2008	6,000	2.72	experimental high-speed compound helicopter with coaxial rotors configuration

Additional Aircraft

Boeing-Sikorsky RAH-66 Comanche
Sikorsky Cypher: UAV featuring a doughnut-shaped design (1992)
Sikorsky Cypher II: advanced development of Cypher UAV (2001)
Vertical Take-Off and Landing Experimental Aircraft: hybrid design combining VTOL and conventional aircraft features
Sikorsky Rotor Blown Wing

Other Products

UAC TurboTrain (1968)
Sikorsky ASPB Assault Support Patrol Boat (1969)

External links