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This is the text i struggle to post in G.91 page. Just to realize how i want to contribute to wiki, and how someone don't want i do it:

The Aeritalia G.91, also known as the Fiat G.91 and nicknamed Gina, was an light Italian fighter aircraft that was intended to serve as standard equipment for NATO air forces in the 1960s. It was eventually only adopted by three - the Italian Air Force, West Germany's Luftwaffe, and the Portuguese Air Force, but enjoyed a long service life that extended over 35 years.

Development
In 1953, European aircraft manufacturers were invited by NATO to submit aircraft for evaluation for the Light Weight Strike Fighter (LWSF) role. The G.91 was designed to the specification by the famous Italian engineer Giuseppe Gabrielli, hence the ""G"" designation. The competition was intended to produce an aircraft that was light, small, expendable, equipped with basic weapons and avionics and capable of operating with minimal ground support. These specifications were developed for two reasons: the first was the nuclear threat and the other was to counter the trend towards larger and more expensive aircraft.

The technical requirements were: 
 1,100 m take-off distance over a 15 m obstacle
 Capability to operate from grass strips and streets
 Max speed of 0.95 Mach
 Range of 280 km with 10 min over the target
 Armoured protection for the pilot and the fuel tanks
 4x12.7 mm or 2x20 mm or 30 mm guns
 A maximum of 2,200 kg empty weight and 4,700 kg max weightFerrari 1992, p. 83.

The challengher proposals must had been presented within two months after the request.
The projecting work was only apparently an easy task, because making a very small aircraft yet capable to cover these NATO specifications was difficult. 

Fiat Aviazione presented G.91 and so did other competitors with a total of 10 projects, analysed since 18 March by AGARD (Advisory Group for Aeronautical Research and Development), led by Theodore Von Karman. The finalists were declared Breguet Taon, Dassault Etendard, Fiat G.91 and Folland Gnat. Another interesting project was Sud Aviation Badoleur, that solved drastically the problem of a proper landing undercarriage, simply omitted and sobstitued with a landing and take off skid (aircraft was moved in ground operations with a special trailer). This, however, was not ufficially presented to AGARD, that choose, on paper, the Taon as winner.

In the meanwhile, there was the problem of the engine, that must been light yet enough powerful and reliable, with easy and cheap maintenance, like the whole aircraft. The solution was realized by Bristol with the Bristol Orpheus, a simple and effective turbojet. It was adopted to all the finalists, so Bristol will won the contest in every case. G.91R, presented by Fiat, was also called 'little Sabre'. It was due by the knowledge gained with license-production of a modern aircraft, the F-86K, that helped to make much experience with advanced jet aircrafts, . It was similar to F-86 as overall design, but smaller and capable to operate from semi-prepared airstrips.

G.91R was 20% heavier than the estimates and this was due partly to testing hardware, but it was powered by a Bristol Orpheus B.Or 801, 1,800 kg/t. 
It was yet capable to supersonic speed in dives, as shown by the flight made in 20 February 1957 when it was able to break the sound barrier four times with 9,000 m dives. His test pilot Riccardo Bignamini, a famous one of that times (he won McKenna Trophy at Empire Test School) was a key element to solve the G.91 shortcomings and the first flight was made in 9 August 1956 at Torino-Caselle airfield. 

Few days after it was tested at high speed and at 1,300 m ceiling, but lost control and Bignamini w