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The least stable is 10 He, with half-life 260(40) yoctoseconds (2.6(4) × 10 −22 s), though 2 He may have an even shorter half-life. In Earth's atmosphere, the ratio of 3 He to 4 He is 1.343(13) × 10 −6. [5] However, the isotopic abundance of helium varies greatly depending on its origin.
The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft.The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.
The Piasecki PA-97 Helistat was an American experimental heavy-lift aircraft, built by Piasecki by fastening four H-34J helicopters to a framework beneath a helium-inflated blimp envelope. [1] The sole prototype was lost during a test flight, killing a test pilot and injuring another four in the course of a single incident. [2]
The Chinese F11C/Hawk II during WW2. The F11C-2 Goshawk was produced in two export versions as the Hawk I and Hawk II fighters. Essentially a modified XF11C-2, the Hawk II was fitted with a Wright R-1820F-3 Cyclone rated at 710 hp (530 kW) at 1,676 m (5,499 ft) and 356 liters of fuel while the Hawk I had 189 liters of internal fuel.
AirPod Pro 2's are at the lowest price we've ever seen, everything at Old Navy is 50% off (with an extra 20% off orders over $100!), Nordstrom's Cyber Monday sale is still on fire, ...
Honeywell said that it may calve its aerospace division from the conglomerate, sending shares up more than 2% before the opening bell Monday. The announcement arrives about one month after Elliott ...
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