The Boeing 314 was a fliyng boat airliner. She was capable of transoceanic flight carring 68 passengers and a crew from 10 to 16. The design include the wing developed for the bomber XB15.
Twelve built, nine used by PanAm that renamed the model Clipper.
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The Boeing XB15 was an American strategic bomber designed during the '30s to test if it would be possible to build a bomber with range 8000 km The new aircraft was huge with some unusual features like gallery, lavatory deicing equipment and autopilot. Only one built.(P Wikipedia)
The Vought/General Dynamics V1600 was a navalized version of the GD F16 proposed for the USN NACF program. The aircraft had structural strengthening, arrestor hook, and a more robust undercarriage. Eventually US Navy chose the evolution of YF17, the twin-engined F18(p Wikipedia)
F15N Sea Eagle was a proposed navalized version of Eagle. The first proposed model was a reinforced variant with foldable wing of F15A cheaper than F14 but less capable. F15N-PNX armed with AIM54 was heavier and no more competitive with the Tomcat (photo theaviationgeekclub com)
The Boeing Vertol 347 was a development of the CH47A realized in 1970. The experimental project reserched how to improve the future versions of the Chinook. A new fuselage section and new four blade rotors were added. A variable pitch wing increased the performance
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The Grumman G698 was a concept for a V/STOL aircraft developed in the '80s. A couple of turbofan were fitted amidship near the centre of gravity. The engines were able to rotate to direct the trust downward (for take off and landing). Never built
(Photo https://t.co/pKBiWxg8Ps)
The FMA IAe 38 was a tailless transport aircraft developed in Argentina during the '60. It was designed under the direction of Horten, and It was based on the Ho VIII. Only one built, the aircraft was underpowered because the envised engines were not yet avaible
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The project of the Armstrong Whitworth AW169 envised four engines. Every nacelle hosted two Gyron Junior (a downsized version of the engine of the Buccaner) with a single air intake. A solid rocket engine was added for high Speed performance.
(photo : https://t.co/4VnSSj7bqg)
Jaguar M was a carrier based version intended for the French Navy. Structure was strengheth and landing gear totally re-designed. But It was underpowered in single engine operation and the single engined, but cheaper Super Etendard was preferred. (P elpoderdelasgalaxias com)
O.R. F155 was issued by Brit Min of Supply for a fighter capable to intercept high-flying supersonic bombers. AW169 was the proposal of Armstrong Whitworth. It was armed with two air to air radar guided missiles. It had 4 turbojet + 1 rocket engine
(P aviation stackexchange com)
The Boeing P-26 Peashooter was the first American all-metal fighter. It had an open-cockpit, fixed landing gear and strutted wing configuration. First flight in'32. The amazing evolution of the aviation: only 3 years after flew the Hurricane and Bf109 (P fiddlersgreen net)
The Airspeed Horsa was a British military glider used during world war two. It was employed to deploy troops behind enemy lines. It was towed by by transport aircraft or outdated bombers likes the Stirling. The Horsa was built mainly in wood, it carried 30 soldiers (P Wikipedia)
The North American NR-349 was a proposed interceptor developed for the USAF as replacement of the F-106. It was based on the bomber A-5 Vigilante. The cylindrical bomb bay of the A-5 was replaced by a third J-79 engine. Armament: 6 x AIM54 Phoenix
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The Boeing 720 was an airliner developed from the 707. It was designed for shorter range and operation from short runways. It was lighter and shorter than 707, with a new wing equipped with Kruger flaps. Built 154 aircrafts in service between '60 and '80.
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The Convair 990 Coronado was a narrow body airliner developed from the 880. This stretched version was produced in response to a request from American Airlines. It asked to design an aircraft able to fly nonstop from New York City to Los Angeles against the wind.
(P Wikipedia)
The Convair 880 was an American narrow body airliner built between 1959 and 1962 in 65 units. It was smaller but faster than B.707 and DC.8. It was powered by GE CJ-805-3 turbojets, a civilian version of the J79 which powered the F-104, F-4 and B-58 Hustler.
(Photo Wikipedia)