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National Advisory Committe for Aeronautics, Research Memorandum -  Altitude of Wind Tunnel Investigation of Performance of Several Propellers on YP-47M Airplane at High Blade Loadings - VI - Hamilton Standard 6507A-2 Four & Three Blade Propellers

An altitude-wind-tunnel investigation has been made to determine
the performance of Hamilton Standard 6507A-2 four-blade and three-
blade propellers on a YP-47M airplane at high blade loadings and high
engine powers. Characteristics of the four-blade propeller were
obtained for a range of power coefficients from 0.10 to 1.00 at free~
stream Mach numbers of 0.20, 0.30, and 0.40. Characteristics of the
three-blade propeller were obtained for a range of power coefficients
from 0.30 to 1.00 at a free-stream Mach number of 0.40. Results of
the force measurements indicate primarily the trend of propeller effi-
ciency for changes in power coefficient or advance-diameter ratio
because no corrections for the effects of tunneluwall constriction on
the installation were applied. Slipstream surveys are presented to
illustrate blade thrust load distribution for certain operating con-
ditions.

Within the range of advance—diameter ratios investigated at each
free-stream Mach number, the efficiency of the four-blade prepeller
decreased as the power coefficient was increased from 0.10 to 1.00.
For the three-blade propeller, nearly constant maximum efficiencies
were obtained for power coefficients from 0.32 to 0.65 at advance—
diameter ratios between 1.90 and 3.00.

In general, for conditions below the stall and critical tip Mach
number, the maximum thrust load shifted from the inboard sections
toward the tip sections as the power coefficient was increased or as
the adrance-diameter ratio was decreased. For conditions beyond the
2 NACA RM No. ssrzs

stall or critical tip Mach number, losses in thrust occurred on the
outboard blade sections owing to flow break-down; the thrust load
increased slightly on the inboard sections.

An investigation oftthe performance of several propellers on a
YP-47M airplane at high blade loadings has been made in the Cleveland
altitude wind tunnel at the request of the Air Materiel Command, Army
Air Forces. As part of the program, Hamilton Standard 6507A-2 four-
blade and three—blade propellers were integrated.

Characteristics of the four—blade propeller were obtained for a
range of power coefficients from 0.10 to 1.00 at freeestream Mach
numbers of 0.20, 0.50, and 0.40. Characteristics of the three—blade
propeller were obtained for a range of power coefficients from 0.30 to
1.00 at a free-stream Mach number of 0.40.