The Morane-Saulnier MS.760 Paris is a French four-seat jet trainer and liaison aircraft designed and manufactured by Morane-Saulnier.
The Paris was based upon an earlier proposed trainer aircraft, the MS.755 Fleuret. Following the failure of the French Air Force to select the Fleuret, Morane-Saulnier opted to develop the design into a liaison aircraft and compact business jet. The primary difference between the two designs was the altered seating arrangement, the original side-by-side seating two-seat cockpit was modified to allow for the addition of another row of two seats to accommodate passengers. The Paris retained the flight characteristics of the Fleuret along with the option for installing armaments, which maintained its potential for use as a military trainer as well for civil aviation. On 29 July 1954, the prototype performed the type's maiden flight.
The primary operators of the Paris were the French air services, who used the type for liaison purposes between 1959 and 1997. During 1955, Morane-Saulnier and American aviation company Beech Aircraft formed a joint venture to market the Paris as the first business jet on the North American market, but the venture was dissolved a few years later due to a lack of customer interest. During the 1960s more advanced variants were developed such as the MS.760B Paris II and the six-seat MS.760C Paris III; the latter would not enter production however. While four-seat propeller planes are commonplace, jet-powered aircraft with this seating arrangement, such as the Grumman EA-6B Prowler combat aircraft, have remained comparatively rare.
Design and development
Origins
The Paris has its origins within an earlier jet trainer aircraft developed by French aircraft manufacturer Morane-Saulnier. During the early 1950s, the French Air Force sought a jet trainer suitable to the ab-initio training sector; in response, Morane-Saulnier produced their own submission, designated as the MS.755 Fleuret. However, the military competition was ultimately won by another bid, which was produced in large numbers as the Fouga Magister. Shortly after this failure, Morane-Saulnier decided to embark upon a re-design of the MS.755 to allow it to function as a four-seat liaison aircraft instead; accordingly, the new aircraft was later given the designation of MS.760 Paris.
According to aerospace publication Flight International, the adaption from the earlier Fleuret to the Paris had been largely achieved via the elimination of the former's armament, the re-design of the cabin floor to remove the downward ejection hatch arrangement, and the repositioning of the cabin's rear bulkhead slightly aft. To avoid a reduction of the aircraft's available fuel tankage as a result of the latter change, the tank was re-profiled in other areas to expand it. In spite of these changes, the Paris still retained the favourable flying characteristics and did not entirely foreclose its use as a trainer aircraft.
The Paris differed from the majority of liaison aircraft then in service by its use of jet propulsion, instead of a turboprop or piston engine. According to M. Vichou, the head of the design department of Morane-Saulnier, the decision to adopt a pair of Turbomeca Marboré jet engines had been determined to be the superior option available; studies found that a single turboprop engine capable of providing at least 2,000 hp was necessary to produce a comparable performance, which would have resulted in the additional complications of appropriately accommodating a fairly large propeller in the design. Another alternative in using a pair of small turboprop engines was also less convenient than the Marboré engine, which could be positioned relatively low down in the airframe and in close proximity to the aircraft's centre-line.