1. Nemuth Parasol
In 1934, Nemuth Parasol, created by a student at the University of Miami. This aircraft even has a circular wing that can be used to fly a plane with reliable. Hundreds of years from now, it seems that the design principles of this aircraft will be adopted for more sophisticated spacecraft later.
2. Scaled Composites Model 281 Proteus
Burt Rutan designed the tandem-wing Scaled Composites Model 281 Proteus which was thin and first flown in the late 1990s, in order to investigate the use of aircraft as a means of telecommunication delivery at altitude. Thanks to its efficient design, this model aircraft is capable of flying at an altitude of 65,000 feet for more than 18 hours.
3. Grumman X-29
In 1984, Grumman X-29 proved that the removal of the jet wing will not be disturbed even though its wings are tilted upside down. For X-29s, like most research aircraft, careful calculations over the years have been made before flight tests.
4. Sikorsky X-Wing
Sikorsky X-Wing was built to combine speed and jet propulsion mechanisms with the capability of taking off from helicopters. Unfortunately, the program was canceled in 1988, shortly after the success of the first X-Wing.
5. Rutan Model 202 Boomerang
Boomerang is not symmetrical for different reasons. The 1996 aircraft was built to remain controlled in case of engine failure on one of the twin engines.
6. Lockheed Martin P-791
The modern Lockheed Martin P-791 was built to combine the high speed of an aircraft with the buoyancy of an airplane. Lockheed Martin still makes and sells this combo masterpiece which he thinks can last up to 20,000 feet to three weeks.
7. Goodyear Inflatoplane
In the 1950s, tire maker Goodyear created the aircraft as above as a prototype for the US Armed Forces. Unfortunately, the Army canceled the project when it realized that there was not much military use for aircraft that could appear like a balloon.Source.
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