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Aérospatiale Corvette

From Alfawiki
Aérospatiale
IndustryAerospace
Founded1970; 56 years ago (1970)
Headquarters
France
ProductsSN 601 Corvette business jet

The Aérospatiale SN 601 Corvette is a French business jet developed in the early 1970s by the aerospace manufacturer Aérospatiale. Production concluded after only 40 units, including prototypes, were built due to underwhelming sales figures.

In response to a request from the French government for a compact twin-turbofan aircraft suitable for liaison and training roles, the companies Sud Aviation and Nord Aviation partnered to create a new business jet. Their collaborative design, initially named the SN 600 Diplomate, was unveiled at the 1968 Hanover ILA Air Show. The first SN 600 prototype took flight on 16 July 1970 but was lost during a test flight on 23 March 1971. Subsequently, two upgraded SN 601 prototypes were developed, with the first flying on 20 December 1972.

Beyond VIP transport duties, several Corvettes served regional carriers such as Air Alsace, Air Alpes, Air Champagne, TAT, and Sterling Airways. Additionally, Airbus Industrie employed a small fleet for transporting personnel across Europe. Due to limited orders over a three-year period, Aérospatiale halted Corvette production in late 1976. Although studies were conducted on an enlarged variant named the Corvette 200, it never progressed to production.

Origins

During the 1950s and 1960s, the French government aimed to develop a twin-turbofan liaison and trainer aircraft to rejuvenate its aviation sector. This initiative led Sud Aviation and Nord Aviation to begin cooperative development efforts in the late 1960s. Progress accelerated in January 1968 following French engine manufacturer SNECMA’s announcement of the M49 Larzac engine.<ref name="FI1"> The aircraft featured a conventional low-wing monoplane layout with turbofan engines mounted at the rear fuselage.

The SN 600 was introduced as a scale model at the 1968 Hanover ILA Air Show. It was larger than similar models such as the Citation 500, incorporating swept wings and aiming for competitive launch costs. The joint venture projected global sales of at least 400 units beyond an initial French military order for 60 aircraft, targeting an estimated worldwide market demand of approximately 2,800 business jets between 1974 and 1980.

Marketing strategies concentrated on international sales, particularly in North America where business jet demand was robust. The SN 600 competed against the French-built Dassault Falcon 20, which had established a presence in North America through Pan American World Airways as distributor by 1973. Efforts to secure North American distribution agreements with firms such as Ling-Temco-Vought (LTV) and later Piper Aircraft were unsuccessful in achieving significant market share.

Following the merger of Sud Aviation and Nord Aviation into Aerospatiale in 1970, development proceeded under the new company. Aerospatiale emphasized the SN 600’s low operating expenses—lower than many turbojet rivals and some turboprops—and its cabin spaciousness that suited commuter airline operations. The prototype's maiden flight occurred on 16 July 1970 using Pratt & Whitney Canada JT15D engines due to ongoing development delays with the Larzac engine. After the prototype crashed during stall testing on 23 March 1971—an event that affected customer confidence—two enhanced SN 601 prototypes were constructed to continue flight testing and refinement.

Redesign and challenges

Following the loss of the SN 600, two enhanced prototypes labeled SN 601 were developed and rebranded as the Corvette 100. This model featured a fuselage extended by 3 ft 5½ in (1.05 m) compared to the SN 600. Its maiden flight occurred on 20 December 1972; however, initial testing uncovered ongoing stall difficulties. By this point, the Corvette lagged three years behind its competitor, the Citation 500, despite both programs commencing around the same period. Due to sluggish development, the French government seriously contemplated terminating the project in 1974.

In 1973, U.S. Corvette Incorporated was founded in Atlanta to serve as a North American sales and completion hub. Aérospatiale forecasted deliveries of 10 Corvettes in 1974, increasing to 25 in 1975 and 35 in 1976, even though the aircraft was approximately one-third costlier than competitors such as the Citation 500 and Learjet 24D. Although deliveries were targeted for March 1974, flight testing revealed necessary design changes. Within a year, U.S. Corvette Inc. was dissolved without any aircraft delivered and replaced by an exclusive distribution agreement with Oklahoma-based Air Center Inc. Shortly afterward, Aérospatiale appointed new leadership to tackle budget overruns on both the Corvette and Concorde programs.

French authorities granted airworthiness certification for the Corvette in May 1974. Delivery schedules were hindered partly due to labor disputes at Pratt & Whitney Canada. After receiving only a single non-certified demonstrator instead of the agreed-upon 70 production units by May 1974, Air Center Inc. initiated legal action against Aérospatiale for failure to perform. Ultimately, only six Corvettes were delivered to Oklahoma, with no additional sales during or following 1975; Aérospatiale terminated its U.S. marketing efforts by March 1976.

By late 1976, production of the Corvette was halted after just 27 orders over two and a half years—significantly below the anticipated rate of six units per month. A report from the French Court of Audit disclosed losses near $190 million, representing about two-thirds of Aérospatiale's fiscal deficits between 1972 and 1975. The investigation criticized management for underestimating market challenges amid competition from British, American, and French manufacturers such as Dassault Aviation’s Falcon 20, concluding that the Corvette program was "a major commercial and financial disaster."

Aérospatiale considered an upgraded Corvette 200 variant with an extended fuselage capable of accommodating up to 18 passengers; nonetheless, production ceased before any units were constructed.

Operational history

The Corvette saw service with several French regional carriers including Air Alsace, Air Alpes, Air Champagne, and TAT European Airlines. The type was also operated by Denmark's Sterling Airways and one aircraft served as VIP transport for the Congolese Air Force. As of January 2009, a limited number of Corvettes remained operational across Europe and Africa; among them was F-GPLA (cn 28) in France, configured for aerial photography tasks. This particular plane was subsequently employed as a chase aircraft during high-speed trials of the TGV high-speed train.

Between 1981 and 2009, Airbus Industrie utilized five Corvettes for internal transportation purposes.

Variants

SN 600
The initial prototype was equipped with two Pratt & Whitney Canada JT15D-1 turbofan engines, each delivering 2,200 lbf (9.8 kN) of thrust.
SN 601
The production variant featured an extended fuselage compared to the SN 600 and was powered by JT15D-4 engines producing 2,500 lb (11.1 kN) of thrust. A total of 39 units were manufactured, including two prototypes.

Aerospatiale SN-601 Corvette

  • Air National Aircraft Sales & Service Inc.
  • Midwest Air Charter (Airborne Express)
  • Jetstar Holland
  • Libyan Air Ambulance
  • Air Inter Gabon
  • Aeromarine
  • Baltic Aviation Inc.

Accidents

Throughout its operational history, including the prototype SN 600, eight Corvettes were lost due to accidents. The most severe crash happened on 3 September 1979, when an SN 601 operated by Sterling Airlines suffered a dual engine failure and crashed into the Mediterranean Sea near Nice, resulting in the loss of all ten passengers and crew.

Bibliography

  • Phillips, Almarin., A. Paul Phillips and Thomas R. Phillips. Biz Jets: Technology and Market Structure in the Corporate Jet Aircraft Industry. Springer Science & Business Media, 2012. .
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