Tests of 2-blade, adjustable pitch, counterrotating tandem propellers, adjusted to absorb equal power at maximum efficiency showed that efficiency of this type was from 0.5% to 4% greater than that of 4-blade propeller and not appreciably inferior to that of 2-blade propeller.
Tandem airplane propellers
Nat Advisory Committee Aeronautics -- Tech Note
1939
10 pages
16 supp sheets, Bibliography
Report
Englisch
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