Traffic airships with special reference to economy (1921)
NASA Technical Reports Server (NTRS) · leaf 30
For a propeller of given diameter, with a certain diminution Of efficiency, the torque and r.p.m. vary according to climbing ratio. . I Fig.l. Propeller efficiency in terms of the moment constant
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
