McDonnell XF-85 Goblin

The McDonnell XF-85 Goblin was a post-war attempt at creating a parasite fighter (a fighter launched from a bomber in order to provide addittional defence). It was designed by a team leaded by Herman D. Barkley, it was intended to be carried by the massive Convair B-36 Peacemaker and they were ordered back in October 1945.
It was a really small egg-shaped aircraft with vertically folding wings and triple tail surfaces. It was intended to be launched from the aircraft and be recovered from a retractable trapeze which was extended by the parent bomber airplane so no undercarriage was fitted. The second prototype which was used for trials, was powered by a 3000lb (1361KGp) Westinghouse J34-WE-37 turbojet engine. It was tested five times on the trapeze of a purposelly modified Boeing B-29 Superfortress, denominated EB-29 on 23rd August 1948 when it was launched three times at 20000ft (6100m) all three of them terminating in emergency landings. Those three flights were followed by another three successful ones where the fighter was recovered successfully by the trapeze. However the programme itself was already a dismal failure and the project was terminated.

Sources:
1. Salamander Books - The Complete Book of Fighters
2. https://en.wikipedia.org/wiki/McDonnell_XF-85_Goblin