# Praga D

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{{infobox aero engine
 | name=Praga D
 | image=File:Praga D (Letectví, No. 8, 1946, p. 243).jpg
 | caption=
 |engine_type=Air-cooled piston engine
 |manufacturer=[Praga](/source/Praga_(company))
 |national_origin=[Czechoslovakia](/source/Czechoslovakia)
 |first_run=1936
 |major_applications=
 |produced=
 |number_built=
 |developed_from=
 |variants_with_their_own_articles=
}}

The '''Praga Hostivař D''' was a four-cylinder, air-cooled, horizontally opposed aircraft engine first produced in [Czechoslovakia](/source/Czechoslovakia) in [1936](/source/1936_in_aviation) but which enjoyed its greatest success after [World War II](/source/World_War_II) due to the explosion in popularity of sports flying. A version for helicopters was produced post World War II as the '''Praga DH'''

==Applications==
*[Mráz M-2 Skaut](/source/Mr%C3%A1z_M-2_Skaut)
*[Aero XE-II](/source/Aero_XE-II)
* [IFIL-Reghin RG-6](/source/IFIL-Reghin_RG-6) (1957)

==Specifications (Praga D)==
{{pistonspecs
|<!-- If you do not understand how to use this template, please ask at [Wikipedia talk:WikiProject Aircraft](/source/Wikipedia_talk%3AWikiProject_Aircraft) -->
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|ref=''Jane's All The World's Aircraft 1951–52.''<ref name="jawa51 p48d">Bridgman 1951, p. 48d.</ref>
|type=four-cylinder, air-cooled, horizontally opposed
|bore=95 mm (3.74 in)
|stroke=100 mm (3.93 in)
|displacement=2.836 L (173 cu in)
|length=894 mm (35.19 in) (with propeller boss)
|diameter=
|width=810 mm (31.89 in)
|height=546 mm (21.5 in)
|weight=67 kg (148 lb)
|valvetrain=1 inlet and 1 outlet valve per cylinder
|supercharger=
|turbocharger=
|fuelsystem=Zenith carburettor
|fueltype=72 octane
|oilsystem=Dry sump pressure lubrication 
|coolingsystem=air
|power=56 kW (75 hp) at 2,650 rpm
* '''Cruising power''': 42 kW (56 hp) at 2,400 rpm
|specpower=19.7 kW/L (0.43 hp/cu in)
|compression=6:1
|fuelcon=

|specfuelcon=235 g/hp hour (0.52 lb/hp hr) at rated power, 220 g/hp hour (0.48 lb/hp hr) at cruise power
|oilcon=2 - 6 g/hp hour (0.004–0.013 lb/hp hour)
|power/weight=
}}

==See also==
{{aircontent
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|see also=

<!-- "Related development", developed into or from this design: -->
|related=

<!-- "Comparable engines", similar to this design: -->
|similar engines=

<!-- "Related lists", relevant lists where this design appears -->
|lists=
*[List of aircraft engines](/source/List_of_aircraft_engines)
<!-- See [WP:Air/PC](/source/WP%3AAir%2FPC) for more explanation of these fields. -->
}}

==References==
{{reflist}}

*{{cite book|last=Bridgman|first=Leonard|title=Jane's All The World's Aircraft 1951–52|year=1951|publisher=Sampson Low, Marston & Company, Ltd.|location=London}}

==Further reading==
{{Commons category-inline}}
* {{cite book |title=Jane's all the World's Aircraft 1947 |editor1-last=Bridgman |editor1-first=Leonard |year=1947 |publisher=Sampson Low, Marston & Co |location=London |page=37d}}

Category:Boxer engines
Category:1930s aircraft piston engines

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Adapted from the Wikipedia article [Praga D](https://en.wikipedia.org/wiki/Praga_D) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Praga_D?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.