Martin P4M-1 Mercator
Glenn L. Martin Company · United States · first flew 1946 · transport aircraft
The Martin P4M-1 Mercator is a unique long-range maritime patrol aircraft powered by a combined piston-and-jet powerplant, with each of its four nacelles housing both a Wright R-4360 radial piston engine and a Allison J33 turbojet for sprint capability. Only 19 were built.
Recognition (WEFT)
| W — Wings | Low-mounted, tapered |
|---|---|
| E — Engines | 4 × piston, wing-mounted |
| F — Fuselage | 25.6 m fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Mixed piston-and-jet powerplant — two R-4360 radials paired with J33 jets in same nacelles
- Long-range maritime patrol aircraft with unusual combined powerplant
- Sleek low-wing design used primarily for SIGINT missions
A sleek low-wing four-engine monoplane with a conventional tail; the mixed powerplant is not visible externally — the four nacelles appear to house standard radial engines with jet exhaust pipes.
Specifications
- The Martin P4M-1 Mercator has a length of 25.6 m (84 ft).
- It has a wingspan of 35.05 m (115 ft).
- Its maximum speed is 653 km/h (406 mph).
- Typical crew: 14.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
Designed in the mid-1940s to provide the US Navy with a high-speed long-range patrol aircraft, the Mercator's unusual mixed powerplant gave it a significant speed advantage over pure-piston types. In service, the P4M-1 was primarily used for electronic intelligence gathering (SIGINT) along Soviet and Chinese coasts, a role that exposed its crews to considerable risk.
Variants
The P4M-1Q was the ELINT-configured variant used for electronic intelligence missions; this was the primary operational form of the type.
Where you'll see it
Served with US Navy patrol and VQ (electronic reconnaissance) squadrons from 1950; several were intercepted and one shot down by Chinese MiGs over international waters in 1956.
Related aircraft
- Martin P4M Mercator
- Martin JRM-1 Mars
- Martin JRM-2 Mars
- Martin JRM-3 Mars
- Canadair C-54GM North Star
- Douglas C-118 Liftmaster
- Antonov An-2
- Beriev Be-8
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