This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
andrew lech collection SDASM.TITLE Lech Experimental CoAxial Helicopter Model SDASM.CATALOG Lech SDASM.DATE SDASM.ADDITIONAL INFORMATION Rotor hub body with controls electric motor insufficient power to lift. Body length inches. SDASM.COLLECTION Andrew Lech Collection SDASM.TAGS Andrew Lech Collection PUBLIC COMMONS.SOURCE INSTITUTION