Results of tests indicate that dual rotating propellers were from 0 to 6% more efficient than single rotating ones, but when propellers operated in presence of wing, gain was reduced about one-half.
Wind-tunnel tests of four- and six-blade single- and dual-rotating tractor propellers
Nat Advisory Committee Aeronautics -- Report
1942
29 pages
Report
Englisch
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Wind-tunnel tests of eight-blade single- and dual-rotating propellers in tractor position
Engineering Index Backfile | 1941
|Wind-tunnel tests of single and dual-rotating tractor propellers of large blade width
Engineering Index Backfile | 1942
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