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Male flowers Seeds of Fraxinus excelsior, popularly known as "keys" or "helicopter seeds", are a type of fruit known as a samara. It is a large deciduous tree growing to 12–18 m (39–59 ft) (exceptionally to 43 m or 141 ft) tall with a trunk up to 2 m (6.6 ft) (exceptionally to 3.5 m or 11 ft) diameter, with a tall, narrow crown. [2]
The Bristol Type 171 Sycamore is an early helicopter developed and built by the helicopter division of the Bristol Aeroplane Company.The name refers to the seeds of the sycamore tree, Acer pseudoplatanus, which fall with a rotating motion. [2]
Some trees (for example maple trees) have seeds that have wing-like structures that enable the seed to spin to the ground in autorotation, which helps the seeds to disseminate over a wider area. The most common use of autorotation in helicopters is to safely land the aircraft in the event of an engine failure or tail-rotor failure.
United States Air Force Pararescuemen jump at half the height of a typical HALO/HAHO insertion 2eme REP Legionnaires HALO jump from a C-160.. High-altitude military parachuting, or military free fall (MFF), is a method of delivering military personnel, military equipment, and other military supplies from a transport aircraft at a high altitude via free-fall parachute insertion.
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Marines prepare to breach a building during a mock helicopter raid at YTC, part of U.S. Marine Corps Weapons and Tactics Instructor Course. German soldiers test new assault rifles at YTC. An MQ-9B unmanned aerial vehicle used the Laguna Army Airfield at YTC to achieve a 48.2 hour endurance record and first FAA certification of an unmanned ...
Follow The Post’s live updates for the latest news, videos, photos and more as mysterious drones fly over New Jersey, New York and elsewhere: ... Up to 60% off must-have brands. AOL.
Startling video shows a helicopter spinning out of control and crashing into a small plane at a Texas airport — with the pilot miraculously walking away unscathed. ... Up to 60% off must-have ...