The Westland-Hill Pterodactyl was one of a number of tailless aircraft designed by that firm in the 1920s. A revolutionary idea, but I have to say that in looking at this photo one would be excused for thinking it was the result of some dire mishap.
Due to its flying characteristics (to say nothing of its appearance), the Vickers Vulcan carried the nickname “Flying Pig”.
The YC-123 was fitted with skis, wing floats, and a host of other devices with the idea of having an aircraft that could fly (and land) just about anywhere.
VB-17G (44-83259) was a VIP transport for General Carl Spaatz during the time he was the Air Force’s first Chief of Staff. The aircraft was nicknamed “Boops” after his daughter.
Boeing’s XAT-15 was a promising trainer but was elbowed aside in favor of other designs. Somewhat of a throwback in construction (it used a lot of wood), the aircraft is seen here at Boeing’s Wichita plant (note the Stearmans in the background).
The XB-24N (44-48753) was another one-off Liberator, but not too bad an idea. It did illustrate that a B-24 was doable with only a single horizontal stabilizer.
The Vultee Vulture in its original configuration. With the snug-fitting engine cowl and nacelle, one could easily mistake the aircraft for having a liquid-cooled engine. It did not, but the engine didn’t like it so Vultee eventually opted for a more conventional open cowl.
The XB-24J (42-73130) was a one of a kind aircraft that incorporated the nose of a B-17G. (Translation: Okay, maybe that wasn’t such a hot idea after all.) Due to the numerous “Frankenstein” versions of highly modified B-24s, there must have been something about its design that caused engineers to have fantasies about modifying the aircraft into something it was never intended to be.