Lockheed Orion

When the US Navy was looking for a new land-based maritime patrol air­craft in the late 1950s Lockheed proposed one developed from the L‑188 Electra passenger transport. This design was selected and became the P3V (later P-3) Orion.

At first Lockheed took an existing Electra, shortened its fuselage and added a tail cone with MAD boom, to serve as aerodynamic test bed. Subse­quent­ly the Lockheed Model 285, as it is officially designated, received a different nose, less round and with fewer cockpit windows. Also most cabin windows dis­appeared and a provision for dropping sonar buoys was added. The tail, wings and engines remained the same however as on the Electra. So on the Orion the intakes are above the prop spinners and the ex­hausts are near the trailing edge, at the top of the wings. The conven­tional horizontal stabilisers have dihedral while the vertical stabiliser is nicely curved from the dorsal fin until the trailing edge. 

The nose of the Lockheed Orion is not as rounded as that of the Electra and has fewer cockpit windows, but still with one triangular eyebrow window.

The tail of the P-3 is basically the same as on the L-188, but with a different tail cone. Most have a long MAD boom like seen here, although different shapes are possible.

The Orion has the same engines as the Electra, with the air intakes above the spinners and exhausts above the wing's trailing edge.

Different versions

How to distinguish the different versions of the Lockheed Orion and Canadair CP-140 Aurora will be added later.

Confusion possible with

Lockheed L-188 Electra

l 188af left side

The Orion is derived from the Electra, which is clearly visible in the curved vertical stabiliser, wings and engine nacelles. The fuselage of the Electra is longer though. Additionally, the nose is more rounded and the cockpit windows are slightly different. Finally, the Electra has a short tail cone.  

Vickers Vanguard

vanguard 953c

The Vickers Vanguard is about the same size as Lockheed Orion, but has a trapezium vertical stabiliser with straight edges. Also, the Vanguard has a more pointed nose, large oval cabin windows and nacelles with circular air intakes, around the prop spinners. 

Vickers Viscount

viscount 806

The Viscount has a similar basic confi­guration as the Orion, including the curved vertical stabiliser. The Viscount has oval cabin windows though, and nacelles with ring shaped air intakes. Contrary to the Orion it has a less streamlined, more pointed nose, with the cockpit popping out. 

Ilyushin Il-38

il 38

The Soviet counterpart of the Orion, derived from the Il-18 passenger transport, can best be recognised by the round cabin windows, two cockpit eyebrow windows on each side and four wheels on the main landing gear, apart from other differences. The fuselage is round.