Fixed pitch wooden propellers were tested in a 1.5 m open working section wind tunnel. Large test repeatabilities masked any effects of propeller aging and prevented accurate limits being set for manufacturing tolerances. Computer predictions overestimated propeller thrust and power by up to 100% at design speeds, while giving a reasonable correlation at static and low speed conditions. Tested propeller efficiencies compare acceptably with predictions at all speeds, pointing to a reduction in aerodynamic incidence as the main reason for the poor high speed performance. Incidence reduction is caused by local compressibility effects altering the shape of the boundary layer over the blade surfaces.
Wind Tunnel Investigation and Preliminary Analysis of Small Propeller Performance
1980
85 pages
Report
No indication
English
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