A twin rotors technology allows to replace the usual rear rotor of an aircraft with a vertical fin

Title (Dublin Core): A twin rotors technology allows to replace the usual rear rotor of an aircraft with a vertical fin
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins
Article Title and/or Image Caption (Dublin Core): Image Caption: Twin rotors lift and propel a teardrop plywood craft designed and built in his spare time by Fred Landgraf, engineer at a Los Angeles, Calif. , aircraft company.
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War II
Date Issued (Dublin Core): 1944-01
Is Part Of (Dublin Core): Popular Science Monthly, v. 144, n. 1, 1944
pages (Bibliographic Ontology): 48
Rights (Dublin Core): Public Domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Lorenzo Chinellato; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): United States of America; Los Angeles