Packard 1A-2500 Explained

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.

Applications

• Boeing TB
• Heinkel HE 8
• Martin T3M
• Naval Aircraft Factory PN
• Huff-Daland LB-1
• PT boats - marine versions of the 3M/4M/5M-2500
• Packard-Bentley one-off race car
• USSR World War II torpedo boats and sub-chasers, which were fitted with 535 4M-2500 engines with W-8 modification under Lend-Lease

Variants

1A-2500:1924, 800 hp. Six built.

2A-2500

1925, 800 hp. 75 built.

2A-2540:? Huff-Daland XHB-1

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

• A Packard 3A-2500 is on display at the National Museum of the United States Air Force.^[2]
• A Packard 3A-2500 is in storage at the National Air and Space Museum.^[3]
• A Packard 3A-2500 is on display at the New England Air Museum.^[4]
• A Packard 4M-2500 is on display at the Packard Proving Grounds Historical Site in Shelby Twp., Michigan.
• A Packard Series 142 Diesel Model 1D-1700 is on display at the Packard Proving Grounds Historical Site in Shelby Twp., Michigan.
• Three working Packard 5M-2500s are installed the only operational PT boat, Higgins PT-658 in Portland, Oregon.

References

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
• Aircraft Engine Historical Society - Packard Engines
• Matthews, Birch. Race With the Wind. Osceola, WI. MBI Publishing, 2001.

External links

• Packard 3A-2500 – National Museum of the United States Air Force

Notes and References

1. Gunston 1989, p.109.
2. Web site: Packard 3A-2500 . National Museum of the United States Air Force . 26 June 2020 . 8 June 2015.
3. Web site: Packard 3A-2500 Geared Drive, V-12 Engine . National Air and Space Museum . Smithsonian Institution . 26 June 2020.
4. Web site: Packard 3A-2500 . New England Air Museum . 26 June 2020.

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