F-11 Tiger

The Grumman F-11 Tiger was a single-seat carrier-based United States Navy fighter aircraft in operation during the 1950s and 1960s.

Development

The F-11 Tiger began as a 1952 Grumman concept to modernize the F9F-6/7 Cougar by implementing the area rule concept with hopes of achieving supersonic performance and reducing transsonic drag. By 1953, redesigns led to a completely new aircraft bearing no more than a familial resemblance to the Cougar. The new wing had full-span leading edge slats and trailing edge flaps with roll control achieved using spoilers rather than traditional ailerons. For storage on aircraft carriers, the F-11 Tiger's wings manually folded downwards. Anticipating supersonic performance, the tailplane was all-moving. The aircraft was designed for the Wright J65 turbojet -- a license-built version of the Armstrong Siddeley Sapphire.

The Navy Bureau of Aeronautics was sufficiently impressed to order 2 prototypes, designated XF9F-8 even though the new fighter was clearly a new design. To add to the confusion, the prototypes were then redesignated XF9F-9 with the XF9F-8 designation going to another more straightforward Cougar derivative. Since the afterburning version of J65 was not ready, the first prototype flew on July 30, 1954 with a non-afterburning engine. In spite of this, the aircraft nearly reached Mach 1 in its maiden flight. The second prototype, equipped with the afterburning engine, became the second supersonic Navy airplane, first honor going to the Douglas F4D Skyray. In April 1955 the aircraft received the new designation F11F-1 ( F-11A after adoption of the unified Tri-Service naming system in 1962).

Operational history

Carrier trial started on April 4, 1956 when a F-11 Tiger landed on and launched from USS Forrestal. In service, the Tiger operated from the carriers USS Ranger, USS Intrepid, USS Bon Homme Richard, USS Forrestal, and USS Saratoga. F-11 career only lasted four years because performance was inferior to the Vought F-8 Crusader and the J65 engine proved unreliable. Thus, Navy cancelled all orders for the F11F-1P reconnaissance version and only 199 F-11A (F11F-1) fighters were built. The aircraft was withdrawn from carrier service by 1961.

While the F-11 Tiger fighter career was short, the Blue Angels performed in these aircraft from 1957 until 1969 when the Tiger was replaced by the McDonnell F-4 Phantom II.

Variants

In addition to the F-11A (F11F-1) fighter, Grumman also proposed a more advanced version of the airframe known as the F11F-1F Super Tiger. This was the result of a 1958 study to fit the new General Electric J79 engine into the F-11 airframe. The Navy was sufficiently interested to authorize modification of two production F11F-1 with enlarged air intakes and YJ79-GE-3 turbojet, the result designated F11F-2. The aircraft first flew on May 25, 1956, reaching Mach 1.44 in one of the flights. After addition of 60&supo; wing root fillets, a 13.5 in (35 cm) fuselage extension, and an uprated J79 engine, F11F-2 reached an impressive Mach 2.04 and an altitude of 80,250 ft (24,466 m). Unfortunately, the new performance came at the price of weight. The Navy felt the new aircraft was too heavy for carrier operations and did not order it into production. F11F-2 was then redesignated F11F-1F, indicating production F11F-1 with a special engine fit. Failing to secure the Navy contract, Grumman marketed the Super Tiger to foreign customers. German Luftwaffe, Japan Air Self Defence Force, and Royal Canadian Air Force showed a lot of interest but in the end settled on the Lockheed F-104 Starfighter instead.

YF9F-9 : Prototype.
F-11F-1 : Single-seat fighter version for the US Navy. later redesignated F-11A in 1962.

Interesting fact

The F-11 Tiger is notorious for being the first jet aircraft to shoot itself down. On the 21st September 1956 during testing a Tiger, test pilot Tom Attridge fired its 20 mm cannons while climbing. During the subsequent push-over and descent, it managed to collide with its own cannon shells that were following a ballistic trajectory.

Specifications F-11A (F11F-1)

References

Joe Baugher. Grumman F11F-1 Tiger