View source for Curtiss V-1570 Conqueror

{{Short description|American piston aircraft engine}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox Aircraft Begin
 |name= V-1570 
 |image = File:Curtiss V-1570 NASM.jpg
 |caption = A V-1570-53 at the [[National Air and Space Museum]].
}}
{{Infobox Aircraft Engine
 |type= [[V12 engine|V12]] [[reciprocating engine|piston engine]]
 |national origin = 
 |manufacturer= [[Curtiss Aeroplane and Motor Company]]
 |first run= 1926
 |major applications=  
 |number built = 
 |program cost = 
 |unit cost = $7000 (1933)<ref>{{cite web | url=https://books.google.com/books?id=Kl46HYlE1PoC&pg=PA1070 | title=Hearings | date=1933 }}</ref>
 |developed from = 
 |developed into = 
 |variants with their own articles = 
}}
|}

The '''Curtiss V-1570 Conqueror''' was a [[V12 engine|V12]] liquid-cooled aircraft engine. Representing a more powerful version of the [[Curtiss D-12]], the engine entered production in [[1926 in aviation|1926]] and flew in numerous aircraft.<ref name="Gunston46">Gunston 1989, p. 46.</ref>

==Design and development==
Designed in 1924 as a military successor to the [[Curtiss D-12]], initially named the Conqueror, it was later given the military designation of V-1570 based on its [[Engine displacement|displacement]] of 1,570 cubic inches (26 L). The engine featured open-ended cylinder liners (advanced technology for the period) and pressurized [[Radiator (engine cooling)|liquid cooling]]. Developments including the use of a [[supercharger]] gradually increased power output until reliability problems due to overheating and coolant leaks became apparent. Military funding for further development of the Conqueror was cut in 1932, efforts by Curtiss to market the engine for civil [[airliner]]s failed and the line was dropped from production.

==Variants==
{{div col|colwidth=27em}}
;V-1570-1
;V-1570-5
;V-1570-7
;GV-1570-7: geared -7
;V-1570-9
;V-1570-11
;V-1570-13
;V-1570-15
;SV-1570-15
;V-1570-17
;V-1570-23
;V-1570-25
;V-1570-27
;V-1570-29
;V-1570-33
;V-1570-53
;V-1570-55
;V-1570-57
;V-1570-59
;V-1570-61
;V-1570-79
;GIV-1570-FM
;V-1570-C
;V-1570-F
;GIV-1570C
{{div col end}}

==Applications==
{{div col|colwidth=27em}}
*[[Atlantic XB-8]]
*[[Bellanca TES]] (1930 version)
*[[Berliner-Joyce P-16]]
*[[Boeing XP-9]]
*[[Boeing Y1B-9]]
*[[Consolidated A-11]]
*[[Consolidated P-30]]
*[[Consolidated Y1P-25]]
*[[Curtiss A-8#XA-8|Curtiss A-8]]
*[[Curtiss B-2 Condor]]
*[[Curtiss CO Condor]]
*[[Curtiss P-1 Hawk]]
*[[Curtiss P-6 Hawk]]
*[[Curtiss XO-30]] (not built)
*[[Curtiss XP-10]]
*[[Dornier Do X]]
*[[Douglas O-31]]
*[[Douglas O-43]]
*[[Douglas Y1B-7]]
*[[Huff-Daland XB-1]]
*[[Lockheed YP-24]]
*[[Thomas-Morse YO-23]]
*[[Tupolev TB-3]]
{{div col end}}

===Other applications===
*[[Mormon Meteor III]] (custom Bonneville salt flat race car)

==Specifications (V-1570 direct drive)==
[[File:Curtiss V-1570 side view NASM.jpg|thumb|Side view of V-1570-53]]
{{pistonspecs
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|ref=''Grey and Gunston.''<ref>Grey 1931, p. 72.</ref><ref name="Gunston46"/>
|type=V-12 liquid-cooled aircraft piston engine 
|bore={{cvt|5+1/8|in}}
|stroke={{cvt|6+11/32|in}}
|displacement={{cvt|1570.4|cuin|L|1}}
|length={{cvt|64|in}} 
|diameter=
|width={{cvt|26+5/16|in}}
|height={{cvt|39+1/16|in}}
|weight= {{cvt|835|lb}} 
|valvetrain=Inlet and exhaust overhead camshafts operating two exhaust and two inlet valves per cylinder, via 'T' head cam followers.
|supercharger=
|turbocharger=
|fuelsystem=Two Stromberg NA-Y6-O carburetors
|fueltype=
|oilsystem=Dry sump, pressure feed and spray with scavenge.
|coolingsystem=Liquid-cooled (water or chemical coolant)
|power={{cvt|600|hp}} at 2,400 rpm (direct-drive)
|specpower=0.43 hp/in³ (19.6 kW/L)
|compression=6.1:1
|fuelcon=
|specfuelcon={{cvt|0.53|lb/hph|kg/kWh}}
|oilcon={{cvt|0.02|lb/hph|kg/kWh}}
|power/weight=
|designer=
|reduction_gear=Direct-drive
|general_other=
|components_other=
'''Ignition system: '''One Scintilla magneto and two distributors
|performance_other=
}}

==See also==
{{Aircontent
|related=
*[[Curtiss D-12]]
|similar engines=
* [[Allison V-1710]]
* [[Hispano-Suiza 12Y]]
* [[Klimov M-105]]
|lists=
* [[List of aircraft engines]]
|see also=
}}

==References==
{{Commons category}}
===Notes===
{{reflist}}

===Bibliography===
{{refbegin}}
* Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}
* Grey, C.G. ''Jane's all the World's Aircraft 1931'' London, England. Sampson Low, Marston & Company Limited 
{{refend}}

{{Curtiss aeroengines}}
{{US military piston aeroengines}}

[[Category:Curtiss aircraft engines|V-1750]]
[[Category:1920s aircraft piston engines]]
[[Category:V12 aircraft engines]]