Heinkel HD 30The Heinkel HD 30 was a biplane reconnaissance seaplane developed by Ernst Heinkel Flugzeugwerke.DevelopmentThe Heinkel HD 30 was similar in layout to the Heinkel HD 19, but differed from the latter in being larger and having a Gnome-Rhône 9Ak [Jupiter VI] engine. It was intended to be launched from a steam-powered catapult mounted on small- and medium-sized ships.