Packard 1A-2500

The Packard 1A-2500 is an American V12 liquid-cooled aircraft engine designed by Packard in 1924 as a successor to the World War I-era Liberty L-12.Gunston 1989, p.109. 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-25001924, 800 hp. Six built. 2A-2500 1925, 800 hp. 75 built. 2A-2540? Huff-Daland XHB-1 3A-25001926, Geared propeller drive option, 800 hp. 175 built. 4A-25001927, fitted with a supercharger, 900 hp. One built. 5A-25001930, experimental use only, 1500 hp. One built. 3M-2500Marine version 4M-2500Marine version, 1200 hp (895 kW), subsequently upgraded in stages to 1500 hp (1,150 kW). 5M-2500Marine 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. A Packard 3A-2500 is in storage at the National Air and Space Museum. A Packard 3A-2500 is on display at the New England Air Museum. 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 in the only operational PT boat, Higgins PT-658 in Portland, Oregon.

Specifications (1A-2500)

Packard 1A-2500

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