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Helicopters are capable of flying with no more than a few feet of clearance below the helicopter's skids or wheels. Fast jets are more constrained and at a typical low-flying speed of 450 knots (830 km/h), 200 feet (61 m) is not unusual and 50 feet (15 m) is possible in relatively flat terrain.
Noise-generating aircraft propeller. Aircraft noise is noise pollution produced by an aircraft or its components, whether on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during takeoff, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing.
10 0 0 Bering Air Flight 445: Over the Norton Sound, Bering Sea: Alaska: Cessna 208B Grand Caravan EX: Disappeared 10 minutes before its scheduled arrival at Nome. Search operations located the crash site the following day. Investigations are ongoing. January 29, 2025 67 0 0 2025 Potomac River mid-air collision: Over Potomac River: District of ...
The newest helicopters are a heavy-duty complement to Cal Fire’s fleet of 34-year-old UH-1H Super Huey helicopters, also military surplus. The Fire Hawks are able to dump more than two-and-a ...
Gordon Smart was on the roof of a nearby car park and saw the crash happen. Eyewitness recalls ‘terrifying’ scene as helicopter hit Clutha pub 10 years ago Skip to main content
Helicopter noise reduction is a topic of research into designing helicopters which can be operated more quietly, reducing the public-relations problems with night-flying or expanding an airport. In addition, it is useful for military applications in which stealth is required : long-range propagation of helicopter noise can alert an enemy to an ...
The name was given because the sound slowly decreases in frequency over about seven minutes. It was recorded using an autonomous hydrophone array. [8] The sound has been picked up several times each year since 1997. [9] One of the hypotheses on the origin of the sound is moving ice in Antarctica. Sound spectrograms of vibrations caused by ...
The Kopp–Etchells effect is a sparkling ring or disk that is sometimes produced by rotary-wing aircraft when operating in sandy conditions, particularly near the ground at night. The name was coined by photographer Michael Yon to honor two soldiers who were killed in combat; Benjamin Kopp, a US Army Ranger, and Joseph Etchells, a British soldier.