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Martin P6M SeaMaster

1955 COLD WAR X-PLANE

History of Martin P6M SeaMaster

The Cold War period (1947-1991) was a period of technological progress, the dynamism of which was driven by developments during World War II (1939-1945). In the early 1950s, the U.S. Navy teamed up with Glenn L. Martin Corporation Aerospace to produce a new nuclear-powered, nuclear-capable airship of considerable power and capability. The aircraft will retain its aircraft mass while incorporating a boat-like fuselage/fuselage that will allow it to land and take off on water. In this way, the U.S.

Navy can now deploy its own nuclear-armed strategic bomber force rather than relying on a fleet managed by the U.S. Air Force.

Airships promised tactical flexibility on the battlefield and could prove more maneuverable than land-based bomberscapable of delivering surprise attacks on the heart of the Soviet empire in short order.

The formal request for the aircraft was made in April 1951. It requires a jet-powered aircraft capable of reaching top speed on the water with a range of 1,500 miles. Its internal payload capacity will be around 30,000 pounds.

USN accepted comments submitted by Martin and Convair and voted for the former's design. A contract was subsequently signed, which provided for the construction of two prototypes for testing. The prototype was named "XP6M" and the original was marked "XP6M-1". The U.S. Navy eventually envisioned a full fleet of 24 jet-powered airships by the end of the programa total that could never be achieved.

The aircraft was named "SeaMaster".

The Martin design features a deep fuselage approach to meet the necessary fuselage shape and internal bomb load. The flight deck is high up in the forward section, and the stern has a vertical tail. The horizontal stabilizer is mounted high, creating the classic T-tail. The wings are shoulder mounted components to provide the required water clearance and provide inherent lift characteristics. The wing gained considerable power and exhibited a noticeable drop at rest.

Engineers initially focused on a pair of Curtis-Wright ramjets and believed their complexity soon led to the selection of 4 x Allison J71-A-4 turbojets. These engines were then mounted as pairs of nacelles at the wing roots of the aircraft.

Despite being a water-based system, the aircraft is equipped with wheeled retractable landing gear that enables it to land on prepared runways - doubling its operational value.

The XP6M-1 prototype flew for the first time on July 14, 1955, and the data collected forced a change in engine position. The prototype was lost on December 7, 1955, when the plane disintegrated in flight and all four crew members on board were missing due to a malfunctioning tail. A second prototype followed with its maiden flight on May 18, 1956.

However, it also suffered a catastrophic tail unit failure. In this case, all four crew members left the plane safely.

The USN SeaMaster program continued and a pre-production YP6M-1 model was introduced in 1957. The example began its testing phase the following year, eventually revealing several major flaws in the overall design. The aircraft was heavily configured, coupled with poor controls and underpowered engines, making it unsuitable for water/water operations.

Five additional airframes were ordered and improvements began: ditched Allison engines in favor of 4 x Pratt & Whitney J75 turbojets, which promised greater performance and visibility outside the cockpit, avionics The same goes for equipment kits. An aerial refueling probe has been added to increase the aircraft's operating range.

This modified design came in the form of the "P6M-2", with a total of eight airframes to follow. By this time, however, the bloated and often delayed program was over -- it was canceled before it reached operational service. The U.S.

Navy chose to fund its ballistic missile submarine program, and all remaining Seahorse airframes were scrapped and lost in naval aviation history.

When completed, the P6M-2 will have an overall length of 134 feet, a wingspan of 103 feet, and a height of 32 feet 5 inches. The operator consisted of four people, including two pilots. The primary armament is a 4,000lb bomb load, while point defense is handled by a 2 x 20mm gun assembly located in the stern turret. The aircraft has an empty weight of 91,300 pounds and a maximum takeoff weight (MTOW) of 176,400 pounds.

The performance of the four completed Pratt & Whitney J75-P-2 turbojets each provides 17,500 pounds of thrust, a top speed of 630 mph, a range of 2,000 miles, and a service ceiling of 40,000 feet.