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Adjustable exhaust nozzle with partly expanded diffusers - a variable area nozzle is required in a jet engine for optimal expansion and adjusting back pressure in the engine when the afterburner is operated, it avoids compressor surge problems due to the increased back pressure on the engine when the afterburner is lit - engines capable of supersonic flight have convergent-divergent exhaust duct features to generate supersonic flow - GE F110 afterburning turbofan jet engine on F-16 fighters - empennage close-up of exhaust and elevator.
Side view of a C-121 Constellation
Historic Dakota troop transport flying over English Channel, England.  Douglas DC3 Dakota twin propeller engine troop transport and freight aircraft in D-Day colour scheme in level flight overhead Poole Bay, English Channel, England in fluffy cloudscape blue,sky
Odena, Spain – November 07, 2020: old biplane aircraft. Pitts Special S-2B rear
World War II bomber parked on runway. B-17.
Boca Raton, Palm Beach County, Florida, USA, July 17, 2023. A Piper fixed wing multi engine (8 seats / 2 engines) N59982 taking off from the Boca Raton Airport.
F-15 eagle fighter jet of the USAF silhouetted against a bright sky.
Morning dew on the nose of Doc, a B-29 Superfortress on display at America's Airshow 2023.
Chantilly, Virginia, USA - November 12, 2023: A Southern Airways Express Cessna 208 Caravan passenger plane approaches Washington Dulles International Airport.
RAF Coningsby, Lincolnshire, England - September 28, 2014: Lancaster bomber circling Coningsby on Lancaster Association Day
Private airplane taking off from Miami International Airport.
Duxford, Cambridgeshire, UK - June 26, 2005: Concorde Supersonic Aircraft, showing detail of tail section. This aircraft, located on a static display was an experimental aircraft to test various avionics etc.
Small propeller airplane approaching the Quebec city airport during autumn day.
3d illustration. British heavy bomber from WW2
Light aircraft at airfield
Wichita skies saw an ancient plane in its skies. This four propeller military bomber plane was active during the Second World War.
Bottom view of a WWII assault plane (SBD  Dauntless), with a bomb
Supermarine Spitfire fighter, Bournemouth, England. Supermarine Spitfire single seat fighter from WW2 in flight over open sea with cumulus cloud formation in blue sky
Computer generated 3D illustration with German fighter planes of World War I
Antonov 2 Biplane flying in the Sky, Rijeka, Croatia.
Luqa, Malta - August 11, 2023: United States Navy Grumman C-2A Greyhound (G-123) (REG: 162159) landed from Sigonella, Sicily and departed to USS Ford.
Part of an old military helicopter,Yekaterinburg,Sverdlovsk Region,Ural,Russia,Nikon D850
Jet, United States – June 08, 2021: A closeup shot of an aircraft flying overhead during a training exercise
Tillamook, Oregon, USA - May 30, 2024: Aero Spacelines Mini Guppy airplane on static display at Tillamook Municipal Airport. The Mini Guppy was modified from a Boeing 377 to carry outsized cargo.
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VH-TQB, a Cessna 208B Grand Caravan coming into land at Darwin International Airport. VH-TQB, operated by Hardy's Aviation is a 2009 turboprop aircraft operating in the Northern Territories of Australia. The Cessna 208 Caravan is a utility aircraft produced by Cessna, fitted with strutted, high wings and typically seats nine passengers in its unpressurized cabin, is powered by a single Pratt & Whitney Canada PT6A tractor turboprop and has a fixed tricycle landing gear
Propeller reconnaisance airplane used during the Vietnam War
An American four-engine turboprop military transport aircraft
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