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McDonnell XF-85 Goblin

XF-85 Goblin
Description
RoleParasite fighter
Crew1
Dimensions
Length14 ft 10 in4.5 m
Wingspan21 ft 1 in6.4 m
Height8 ft 3 in2.5 m
Wing area90 ft²8.3 m²
Weights
Empty3,740 lb1,696 kg
Loaded4,550 lb2,063 kg
Powerplant
Engines Westinghouse XJ-34
Power3,000 lb force13 kN
Performance
Maximum speed664 mph1,069 km/h
Combat range
Ferry range
Service ceiling48,000 ft15,000 m
Rate of climb12,500 ft/min3,800 m/min
Armament
Guns4 times 0.50 in (12.7 mm) machine guns

The McDonnell XF-85 Goblin was a fighter aircraft, conceived during World War II and intended to be carried in the bomb bay of the giant Convair B-36 bomber as a defensive parasite fighter. Its first flight was on 23 August, 1948.

Two prototypes were built, and both still survive; one in the USAF Air Museum at Wright-Patterson Air Force Base in Ashland, Ohio and the other at the Strategic Air Command Museum outside Omaha, Nebraska.

Four factors combined to kill the XF-85 program.

  1. Docking with the bomber 'host' proved much more difficult than thought; even experienced test pilots had trouble.
  2. The XF-85 was no match for the conventional enemy fighters it would have to engage to defend the bombers - it was slower and much more lightly armed.
  3. The range of jet escort fighters improved so that they could accompany the bombers further.
  4. Tight budgets meant that less important programs were canned.

All tests undertaken on the XF-85 were carried out using a Boeing B-29 Superfortress bomber because a prototype B-36 was unavailable. Later, a B-36 was used as a mother ship for similar tests, carrying a conventional Republic F-84 Thunderstreak fighter. These tests, known as FICON (Fighter-in-Convair) experiments, were also found to be of little long term practical use and the whole concept was dropped.

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US fighter aircraft 1940-1949 Parasite aircraftBoeing X-43 being dropped from under the wing of a B-52 Stratofortress. A parasite aircraft is an aircraft which is carried underneath, and air launched by a mothership aircraft. The first use for parasite aircraft was in 1918, when the British used a Sop

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