The Lockheed P-3 Orion is a four-engined, turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner; it is easily distinguished from the Electra by its distinctive tail stinger or "MAD" boom, used for the magnetic anomaly detection (MAD) of submarines.
Lockheed P-3 Orion
The first Orion prototype was a converted Lockheed Electra.
P-3s from Japan, Canada, Australia, Republic of Korea, and the United States at MCAS Kaneohe Bay during RIMPAC 2010
A USN P-3A of VP-49 in the original blue/white colors
A turboprop is a turbine engine that drives an aircraft propeller.
GE T64 turboprop, with the propeller on the left, the gearbox with accessories in the middle, and the gas generator (turbine) on the right
A Rolls-Royce RB.50 Trent on a test rig at Hucknall, in March 1945
The Kuznetsov NK-12 is the most powerful turboprop to enter service
A military transport aircraft, over 2,500 Lockheed C-130 Hercules have been built