Flying Aircraft Carriers of the USAF:
The great size of the B-36 Peacemaker made it possible for the behemoth to carry, launch, and retrieve other airplanes. The McDonnell XF-85 Goblin program was intended to provide the B-36 Peacemaker with a fighter for self defence which could be carried entirely within the bomb bay of the bomber. The constraints were that the fighter had to be only sixteen feet long, and only five feet wide when stowed. The wings of the Goblin were designed to fold up alongside each side of the fuselage to fit into the Peacemaker. Due to the unavailability of a B-36 for the flight tests, they were conducted using an EB-29B, serial 44-84111, which was named Monstro, after the whale that swallowed Pinochio.
Republic assembled a mockup of the XF-85 Goblin and its trapeze. (McDonnell Corporation negative D4E 5281)
Goblin 46-0524 was tested in the 40-foot by 80-foot wind tunnel at the Ames Research Center. The Goblin's ventral speed brake is extended below the rear fuselage. (NASA Dryden Fllight Research Center technical library)
Goblin 46-0524 at the McDonnell plant in St. Louis before delivery to Edwards AFB. It was the first to fly on August 23, 1948. It made six of the seven free flights flown by the Goblins. (McDonnell Corporation negative D4E 10112)
The pilot for all XF-85 Goblin flights was Ed Schoch. (McDonnell Douglas).
XF-85 46-0524 with its hook extended on the Edwards Air Force Base flight line.(Air Force Flight Test Center History Office).
The XF-85 is only five feet wide with its wings folded. (still frame from US Air Force film 17593 XF-85 Initial Flight)
A special pit was dug into the tarmac at South Base for loading the XF-85 into the EB-29B. XF-85 46-0524 is seen in the loading pit on August 2, 1948. The complexity of the folding trapeze is evident. Note the "horse collar" at the end of the trapeze which served to secure the nose of the Goblin after it had engaged the cross bar. (AFFTC/HO)
Preparing the Gobiln to be loaded into Monstro. (still frame from XF-85 Initial Flight)
Close up of the XF-85 hook and the trapeze receiving bar. (still frame from XF-85 Initial Flight)
Monstro takes off with the Goblin. (still frame from XF-85 Initial Flight)
The trapeze is extended but the horse collar is still grasping the nose of the Goblin as a Boeing B-29 Sup0erfortress flies chase. (still frame from XF-85 Initial Flight)
Monstro and the Goblin in flight on August 23, 1948. (McDonnell Corporation negative D4E 10095)
The horse collar is raised beore launching the XF-85. (still frame from XF-85 Initial Flight)
Because of the turbulence encountered as the XF-85 appproached the trapeze, only three of the seven free flights ended in a successful hookup. The other four flights ended in skid landings on Rogers dry lakebed at Edwards AFB. During the first flight on August 23, 1948, Ed Schoch missed the trapeze with the hook and hit it with the cockpit canopy of the Goblin. The trapeze broke the canopy and knocked off his helmet. Schoch was forced to land on the dry lakebed. (still frame from XF-85 Initial Flight)
XF-85 46-0524 sits on Rogers Dry Lake after the first flight. (still frame from XF-85 Initial Flight)
XF-85 on the extended trapeze. (still frame from XF-85 Initial Flight)
Schoch approaches the trapeze on one of three successful contacts. (still frame from XF-85 Initial Flight)
XF-85 46-0523 on the South Base flightline at Edwards AFB. This Goblin was equipped with vertical surfaces at the wingtips to augment the six vertical surfaces clustered around the tail. (McDonnell Corporation negative D4E 13188).
XF-85 46-0523 posed in front of Monstro on the South Base flightline. The loading pit can be seen behind them. (McDonnell Corporation negative D4E 13137).
XF-85 46-0523 was the second Goblin to fly. It made its only captive flight on March 19, 1949 and its only free flight on April 8, 1949. (AFFTC/HO).
Ground clearance was limited while carrying the XF-85. (McDonnell Corporation negative D4E 13006)
Monstro's outer wing panels and horizontal stabilizers had yellow and black stripes. Its rear fuselage and vertical stabilizer were painted yellow. The control surfaces and leading edges were unpainted.(still frame from XF-85 Initial Flight)
Goblin 46-0523 seen on display next to the B-36J at the Air Force Museum on August 17, 1998. (Brian Lockett).
Detail of the retractable hook. The tip of the hook was extended late in the flight program of the Goblin. On one occasion, the tip of the hook was snapped off in an attempt to attach to the EB-29B. Photographed at the Air Force Museum on August 17, 1998. (Brian Lockett).
McDonnell XF-85 Goblin
Wingspan: 21 feet 1-1/2 inches, folded: 5 feet
Length: 16 feet 3 inches
Wing Area: 90 square feet
Maximum Unhook Weight: 4550 pounds
Proposed Armament: 4x 50 caliber machine guns
Powerplant: 3,000 pound J34-WE-22 turbojet
Boeing B-29 Superfortress
Wingspan: 141 feet
Length: 99 feet
Wing Area: 1740 square feet
Maximum Take-Off Weight: 140,000 pounds
Maximum Bomb Payload 20,000
Powerplant: 4x 2,200 hp Wright R-3350 two bank radial engines
Flying Aircraft Carriers of the USAF
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Convair GRB-36D 49-2694 and Republic RF-84K Thunderflash 52-7258 at Edwards Air Force Base, California
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