<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{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 |national_origin=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 in 1936 but which enjoyed its greatest success after 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 *Aero XE-II * 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 --> <!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with </li> and start a new, fully formatted line with <li> --> |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 <!-- other related articles that have not already linked and do not fit the specific entries below: --> |see also=

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<!-- "Related lists", relevant lists where this design appears --> |lists= *List of aircraft engines <!-- See WP:Air/PC 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