Fiat G.91Y

Fiat (later Aeritalia)
Company type	Aerospace manufacturer
Industry	Aviation, defense
Predecessor	Fiat Aviazione
Fate	Merged to form Aeritalia in 1969
Successor	Aeritalia
Headquarters	Italy, Italy
Area served	Italy
Products	Aircraft, including the G.91Y

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File:G91y-1.jpg

A Fiat G.91Y at Ramstein Air Base in 1986

The Fiat (subsequently Aeritalia) G.91Y represents an Italian reconnaissance and ground-attack platform that took to the skies for the first time in 1966. While it bears a resemblance to its predecessor, the Fiat G.91, this model is essentially a comprehensive redesign, most notably featuring a twin-engine setup in place of the original's single powerplant.

Design and development

The G.91Y was developed as a higher-performance iteration of the Fiat G.91, financed by the Italian government. It was derived from the two-seat trainer variant, the G.91T, but replaced its single Bristol Orpheus turbojet engine with two afterburning General Electric J85 turbojets, resulting in a thrust increase of approximately 60% compared to the single-engine version.^[1] Additional structural changes aimed at reducing airframe weight further enhanced performance, while an extra fuel tank occupying the space formerly used by the rear seat in the G.91T extended operational range. The aircraft’s agility in combat was also improved through the incorporation of automatic leading edge slats.^[1]

Significant advancements were made to the avionics suite, incorporating numerous systems originally developed by American, British, and Canadian manufacturers, which were produced under license within Italy.^[1]

Testing of three pre-production units proved successful; one example achieved a top speed close to Mach 0.98. Initial issues with airframe buffeting were identified during trials and addressed in production models by slightly elevating the position of the tailplane.

Production

The initial contract for 55 aircraft intended for the Italian Air Force was fulfilled by Fiat in March 1971. By that time, the company had adopted the name Aeritalia, following the 1969 merger of Fiat Aviazione with Aerfer. The original order was expanded to 75 units, although only 67 were ultimately delivered. The development timeline for the G.91Y was notably extensive; after producing two prototypes, approximately 20 pre-production models were commissioned. The first of these pre-series 'Yankee' aircraft took to the skies in July 1968.

The Italian Air Force (AMI) placed orders in two phases: an initial batch of 35 fighters, followed by a subsequent order of 20 units, which was later reduced to 10. Deliveries concluded around mid-1976, resulting in a total production of two prototypes, 20 pre-series aircraft, and 45 production models. No international sales were secured. These aircraft operated with the 101° Gruppo/8° Stormo based at Cervia-S.Giorgio starting in 1970, and from 1974, they were also assigned to the 13° Gruppo/32° Stormo at Brindisi. These 'Gruppi'—the Italian equivalent of British squadrons, typically comprising 18 aircraft—remained active into the early 1990s as the sole units equipped with the 'Yankee.' They performed attack and reconnaissance missions over both land and maritime environments until replaced by the AMX.

Variants

G.91Y – Prototype and production versions.
G.91YT – Proposed two-seat trainer model.
G.91YS – Prototype outfitted with upgraded avionics and additional hardpoints designed to carry AIM-9 Sidewinder missiles for Swiss evaluation; its maiden flight occurred on 16 October 1970.

Operators

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Italian Air Force operated a fleet of 65 Fiat G.91Ys until their retirement in 1994.

Aircraft on display

A Fiat G.91Y is preserved and publicly exhibited at the Italian Air Force Museum, located in Vigna di Valle.
Another Fiat G.91Y serves as a gate guardian at Antonio Locatelli High School in Bergamo, Italy.

Specifications (G.91Y)

File:Aeritalia G.91Y 3-view line drawing.png

Orthographic projection of the Fiat G.91Y

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External links

Flight, 1965 - Original advertisement prior to the initial flight

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[Flight68-1] 1.0 ^1.1 ^1.2 [Staff author] 20 June 1968. "Fiat G.91Y" Flight International, p. 931. www.flightglobal.com. Retrieved: 30 December 2011.

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