The Effect on Airplane Performance of the Factors That Must Be Considered in Applying Low-Drag Cowling to Radial Engines (1933)
NASA Technical Reports Server (NTRS) · leaf 19
REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS … Figure 20— Pilot's view forward with fuselage 2 as affected by the use of several different low-drag cowlings
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.