Development of the XF-87 began at Curtiss-Wright in 1946, it would eventually be intended to be an all-weather interceptor. The Blackhawk was developed from an earlier ground attack, tactical bomber design, the XA-43. The Blackhawk was a response to the initial specification for a jet-powered night fighter, capable of speeds up to 530 mph, issued by the US Army Air Force in August 1945.
A number of companies responded including Bell Aircraft, Consolidated-Vultee, Douglas Aircraft, Northrop, Goodyear and Curtiss-Wright. The US Army Air Force down-selected Northrop’s design – then known as the N-24 and the Curtiss-Wright design- known as the Model 29A.
The XP-87 had a two-man crew seated side-by-side and was powered by two pairs of Westinghouse XJ34-WE-7 turbojet engines mounted on the wings. In comparison to the sleeker Northrop design, the Blackhawk was a slightly larger, bulkier and heavier aircraft with a straight wing profile. The XJ34-WE-7 turbojets only provided 12,000 lbf and Curtiss-Wright’s test pilot B. Lee Miller described performance in initial tests as sluggish. The Blackhawk’s armament was to consist of four 20mm cannons mounted in a nose turret.
The US Army Air Force designated the Curtiss-Wright jet the XP-87, while Northrop’s N-24 became the XP-89 and full-scale models of both were ordered.
In June 1948 the newly formed US Air Force re-designated fighters from P to F and the XP-87 became the XF-87 when prototypes were ordered. The XF-87 made its first flight in March 1948. During subsequent flight evaluations in October 1948, the Northrop XF-89 was found to be faster than the XF-87 and the US Navy’s XF3D (Douglas F3D Skyknight). While the Blackhawk was a capable and generally satisfactory aircraft it was deemed to be underpowered. It also reportedly suffered from buffeting at relatively slow speeds.
Evaluators disliked the Northrop and reportedly favoured the XF-87, however, one evaluating pilot likened its handling to a medium Bomber. An improved faster and more powerful Blackhawk was planned with J47 engines from General Electric. The fate of a second prototype is unclear and sources conflict. Most sources state that the XF-87 never had its armament fitted, however, photographic evidence clearly shows an aircraft, not with a turret, but with four nose mounted guns. This aircraft may be one of the airworthy prototypes or it could be a full-scale mock up built to show the USAAF during the selection process.
Despite the trials favouring the XF-89, the USAF initially ordered 57 F-87A fighters and 30 RF-87A reconnaissance aircraft from Curtiss-Wright in June 1948. Curtis-Wright and the USAF began a publicity campaign to unveil the new fighter, even appearing on the cover of an August edition of Aviation Week and in numerous other aviation publications, but the orders were abruptly cancelled in October 1948 and the USAF moved forward the development of the Northrop XF-89 instead. Check out our video on the F-89 Scorpion linked above.
The reason for this reversal of the decision is unclear. Only minor faults had been identified during testing and the more powerful J47 engines would have greatly increased the Blackhawk’s speed. The official reason for the cancellation was reportedly a disagreement on the price of a redesigned wing profile. According to his memoir, Walter Tydon, Curtiss-Wright’s chief engineer at the time, believed that some bad blood between Curtiss-Wright’s management and the then-President Harry S. Truman may have led the F-87 contract to be cancelled. Truman was Senator for Missouri from 1935 to 1945 and during that time Tydon believed he had come into conflict with the Curtiss-Wright’s management, perhaps regarding the company’s factory in St. Louis. Without substantial archival research it is difficult to verify either the official reason or Tydon’s theory.
Another potential reason for the cancellation was raised during the Congressional Hearings regarding the B-36 Program, Congressman Charles B. Deane noted that both Curtiss-Wright and Northrop had been informed that “unless they agreed to merge with Consolidated Vultee, business would be bad for them.” The testimony before the hearing notes that Curtiss-Wright were unenthusiastic about a potential merger and this might have been why the F-87 contract was cancelled. The Secretary of the Air Force denied this, however, stating that the cancellation was the result of “operating difficulties with the experimental model of the F-87, plus increasingly satisfactory operating data on competitive all-weather fighters.”
Sadly, the prototype XF-87 Blackhawk’s was reportedly scrapped and photographs and footage of the initial flight testing of the Blackhawk is all we have left. The loss of the interceptor contract to Northrop led to the end of Curtiss-Wright’s aircraft production, with the Blackhawk being their last fighter design.
Special thanks to Mark Lane, the grandson of Walter Tydon, Curtiss-Wright’s chief engineer, for taking the time to discuss the Blackhawk and his grandfather’s role in its design.
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Saga of the P-40 and Curtiss Airplane Division: Its Rise and Demise, W. Tydon
Newest Fighter In the Skies, Aviation Week, 2 Aug. 1948
Ad featured in Army & Navy Journal, Vol. 85, No. 40, 7 Aug. 1948 (source)
Ad featured in Air Force, Vo.31, No.9, Sept. 1948 (source)
‘Investigation of the B-36 Bomber Program’, US Congressional Hearing, Aug.-Oct. 1949, (source)
Curtiss Aircraft, 1907-1947, P.M. Bowers (1987)
American Attack Aircraft Since 1926, E.R. Johnson (2008)
The Big Book of X-Bombers & X-Fighters: USAF Jet-Powered Experimental Aircraft and Their Propulsive Systems, S. Pace (2016)
Curtiss-Wright Aeroplane Factory, Missouri, National Register of Historic Places, US National Park Service (2016) (source)