Packard 1A-2500#Variants
{{short description|American V-12 liquid-cooled aircraft engine}}
| {{Infobox Aircraft Begin
|name = 1A-2500 |image = File:Packard 3A-2500 USAF.jpg |caption = A preserved Packard 3A-2500 on display at the National Museum of the United States Air Force }} {{Infobox Aircraft Engine |type=Liquid-cooled V12 engine |manufacturer=Packard |national origin= United States |first run= 1924 |major applications= |number built = 258 |program cost = |unit cost = $19,375 (Geared 3A-2500) |developed from = |developed into = |variants with their own articles = }} |
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.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.{{cn|date=March 2020}}
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{{cn|date=March 2020}}
- 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{{cn|date=February 2020}}
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{{cn|date=March 2020}}
;4M-2500:Marine version, 1200 hp (895 kW), subsequently upgraded in stages to 1500 hp (1,150 kW).{{cn|date=March 2020}}
;5M-2500:Marine version, larger supercharger, aftercooler, and power output of 1850 hp{{cn|date=March 2020}}
Engines on display
- A Packard 3A-2500 is on display at the National Museum of the United States Air Force.{{cite web |title=Packard 3A-2500 |url=https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195697/packard-3a-2500/ |website=National Museum of the United States Air Force |access-date=26 June 2020 |date=8 June 2015}}
- A Packard 3A-2500 is in storage at the National Air and Space Museum.{{cite web |title=Packard 3A-2500 Geared Drive, V-12 Engine |url=http://airandspace.si.edu/collection-objects/packard-3a-2500-geared-drive-v-12-engine/nasm_A19660004000 |website=National Air and Space Museum |publisher=Smithsonian Institution |accessdate=26 June 2020}}
- A Packard 3A-2500 is on display at the New England Air Museum.{{cite web |title=Packard 3A-2500 |url=http://www.neam.org/engine-collection-detail.php?name=packard3a2500 |website=New England Air Museum |accessdate=26 June 2020}}
- A Packard 4M-2500 is on display at the Packard Proving Grounds Historical Site in Shelby Twp., Michigan.{{cn|date=March 2020}}
- A Packard Series 142 Diesel Model 1D-1700 is on display at the Packard Proving Grounds Historical Site in Shelby Twp., Michigan.{{cn|date=March 2020}}
- Three working Packard 5M-2500s are installed the only operational PT boat, Higgins PT-658 in Portland, Oregon.{{cn|date=March 2020}}
Specifications (1A-2500)
{{pistonspecs
|
|ref=Aircraft Engine Historical Society[http://www.enginehistory.org/Packard/StatsAllPackardAero.pdf Aircraft Engine Historical Society - Packard] {{webarchive|url=https://web.archive.org/web/20150325070543/http://enginehistory.org/Packard/StatsAllPackardAero.pdf |date=2015-03-25 }} Retrieved: 30 January 2009 and Race With the Wind By Birch Matthews {{citation needed|date=December 2010}}
|type=12-cylinder V engine
|bore={{convert|6+3/8|in|mm|0||abbr=on}}
|stroke={{convert|6+1/2|in|mm|0||abbr=on}}
|displacement={{convert|2540|cuin|L|abbr=on}}
|length=
|diameter=
|width=
|height=
|weight={{convert|1120|lb|kg|abbr=on}}
|valvetrain=Four valves per cylinder, overhead camshaft
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=Petrol
|oilsystem=
|coolingsystem=Liquid-cooled
|power={{convert|850|hp|kW|abbr=on}} at 2,500 rpm
|specpower= 0.33 hp/in³ (15.2 kW/L)
|compression=
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=0.76 hp/lb (1.25 kW/kg)
}}
See also
{{Commons category|PT boats}}
{{aircontent
|see also=
|related=
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References
=Notes=
{{reflist}}
=Bibliography=
{{refbegin}}
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}
- [https://web.archive.org/web/20150325070543/http://enginehistory.org/Packard/StatsAllPackardAero.pdf Aircraft Engine Historical Society - Packard Engines]
- Matthews, Birch. Race With the Wind. Osceola, WI. MBI Publishing, 2001. {{ISBN|0-7603-0729-6}}
{{refend}}
External links
{{Commons category|Packard 3A-2500}}
- [https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195697/packard-3a-2500/ Packard 3A-2500] – National Museum of the United States Air Force
{{Packard aeroengines}}
{{PT boat}}
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