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The Bell X-22 is an American V/STOL X-plane with four tilting ducted fans. Takeoff was to selectively occur either with the propellers tilted vertically upwards, or on a short runway with the nacelles tilted forward at approximately 45°. Additionally, the X-22 was to provide more insight into the tactical application of vertical takeoff troop ...
It is a toxic, corrosive, colorless gas, with a density of about 13 kg/m 3 (22 lb/cu yd) (roughly 11 times heavier than air). [2][3] It is the only known gaseous transition metal (or d-block) compound and the densest known gas under standard ambient temperature and pressure (298 K, 1 atm). [4] WF6 is commonly used by the semiconductor industry ...