Packard 1A-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. 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
;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, subsequently upgraded in stages to 1500 hp.
;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].
- 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 the only operational PT boat, Higgins Patrol [torpedo boat PT-658|PT-658] in Portland, Oregon.