Packard 1A-2500

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1A-2500
Packard 3A-2500 USAF.jpg
A preserved Packard 3A-2500 on display at the National Museum of the United States Air Force
Type Liquid-cooled V12 engine
National origin United States
Manufacturer Packard
First run 1924
Number built 258
Unit cost $19,375 (Geared 3A-2500)

The Packard 1A-2500 is an American V-12 liquid-cooled aircraft engine designed by Packard in 1924 as a successor to the World War I-era Liberty L-12.[1] Five aero variants were produced, of which the 3A-2500 was the most numerous. Three marine versions, used most prominently in American World War II PT-boats, the 3M-2500, 4M-2500, and 5M-2500, were also derived from it.

As a result of Packard's World War II collaboration with British Rolls-Royce to produce the Packard-Merlin version of the V-12 Rolls-Royce Merlin, engines in the 1A-1500 - 5M-2500 series are often confused with both.

Applications[edit]

Variants[edit]

1A-2500
1924, 800 hp. Six built.
2A-2500
1925, 800 hp. 75 built.
3A-2500
1926, Geared propeller drive option, 800 hp. 175 built.
4A-2500
1927, fitted with a supercharger, 900 hp. One built.
5A-2500
1930, experimental use only, 1500 hp. One built.
3M-2500
Marine version
4M-2500
Marine version, 1200 hp (895 kW), subsequently upgraded in stages to 1500 hp (1,150 kW)
5M-2500
Marine version, larger supercharger, aftercooler, and power output of 1850 hp

Engines on display[edit]

Specifications (1A-2500)[edit]

Data from Aircraft Engine Historical Society[2] and Race With the Wind By Birch Matthews[citation needed]

General characteristics

  • Type: 12-cylinder V engine
  • Bore: 6 38 in (160 mm)
  • Stroke: 6 12 in (170 mm)
  • Displacement: 2,490 cu in (40.8 L)
  • Dry weight: 1,120 lb (510 kg)

Components

Performance

See also[edit]

Comparable engines
Related lists

References[edit]

Notes[edit]

  1. ^ Gunston 1989, p.109.
  2. ^ Aircraft Engine Historical Society - Packard Retrieved: 30 January 2009

Bibliography[edit]

External links[edit]