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 Data from Jane's All The World's Aircraft 1951–52.

[1] Related lists Media related to Praga D at Wikimedia Commons