Lockheed P-3 Orion

Quoting from Wikipedia:


 * The Lockheed P-3 Orion is a four-engine 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. The aircraft is easily distinguished from the Electra by its distinctive tail stinger or "MAD Boom", used for the magnetic detection of submarines.

This 3D prop of the Lockheed P-3 Orion was created by Pedro Caparros.