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Characteristics of Several Single- and Dual-Rotating Propellers in Negative Thrust

Description: Report discusses the thrust and power characteristics of several single- and dual-rotating propellers with differing blade width and number of blades for negative-thrust operation from -45 degrees to 145 degrees blade angle. From Summary: "The tests indicate that it is possible to predict for a given propeller design characteristics in the negative-thrust range from known characteristics at a different activity factor. Adequate negative thrusts were indicated for extremely high positive as well… more
Date: March 1945
Creator: Gray, W. H. & Gilman, Jean, Jr.
Item Type: Refine your search to only Report
open access

The Effect of Modified Baffles and Auxiliary-Cooling Ducts on the Cooling of a Double-Row Radial Engine

Description: Report discussing testing to determine the cooling effect of modified baffles and auxiliary-cooling ducts on the rear-row cylinders of a double-row radial engine. The modified baffles were found to reduce the temperatures of the exhaust-valve seats, but did not have an effect on the valve-guide temperatures. The auxiliary-cooling ducts reduced temperatures of the exhaust-valve seats and rear spark plug gaskets.
Date: March 20, 1945
Creator: Gendler, Stanley L. & Geisenheyner, Robert M.
Item Type: Refine your search to only Report
open access

Flight Tests of a Rudder With a Spring Tab on an F6F-3 Airplane (BuAer No.04776)

Description: Report discussing testing on an F6F-3 with a spring-tab rudder to determine the directional stability and control characteristics. Using the spring-tab rudder was found to result in lower trim-force change with speed and lower pedal forces in sideslips than the original rudder. Pilots were found to prefer the maneuverability of this configuration.
Date: March 1945
Creator: Williams, Walter C.
Item Type: Refine your search to only Report
open access

Flight Tests of the Sikorsky HNS-1 (Army YR-4B) Helicopter 1: Experimental Data on Level-Flight Performance With Original Rotor Blades

Description: "Results of performance measurements made in level fight with the HNS-1 (Army YR-4B) helicopter are presented. These data include torquemeter measurements of shaft power for both the main rotor and the tail rotor. The power data, in conjunction with full-scale-tunnel date on the lift and drag of the fuselage, are used to calculate the drag-lift ratio for the main rotor" (p. 1).
Date: March 1945
Creator: Gustafson, F. B.
Item Type: Refine your search to only Report
open access

High-Speed Photographs of a YR-4B Production Rotor Blade for Simulated Flight Conditions in the Langley Full-Scale Tunnel

Description: Report discussing tests of a Sikorsky YR-4B helicopter, including photography of a rotor blade in forward-flight conditions at several azimuth angles for several tip-speed ratios. Fabric deformation in the form of sagging and bulging was noted. A reversal in the bending curve near the blade tip was also noted, which was hypothesized to come from losses of lift and high centrifugal force.
Date: March 1945
Creator: Dingeldein, Richard C. & Schaefer, Raymond F.
Item Type: Refine your search to only Report
open access

Investigation of Slipstream Effects on a Wing-Inlet Oil-Cooler Ducting System of a Twin-Engine Airplane in the Ames 40- by 80-Foot Wind Tunnel

Description: Report discussing an investigation of wing-inlet oil-cooler ducts on a twin-engine airplane to determine internal and external-flow characteristics of the ducting installation. Testing was also performed on revised inlets to attempt to develop a ducting system with low overall losses throughout the operating range.
Date: March 10, 1945
Creator: Chapman, Dean R.
Item Type: Refine your search to only Report
open access

Lift Tests of a 0.1536c Thick Douglas Airfoil Section of NACA 7-Series Type Equipped With a Lateral-Control Device for Use With a Full-Span Double-Slotted Flap on the C-74 Airplane

Description: Report discussing lift tests on a two-dimensional airfoil model similar to a Douglas C-74 with a double-slotted flap and lateral-control device. Information about the maximum lift coefficient, aileron and flip effectiveness, and flap stall is provided.
Date: March 1945
Creator: Nuber, Robert J. & Rice, Fred J., Jr.
Item Type: Refine your search to only Report
open access

Operating Stresses in Aircraft-Engine Crankshafts and Connecting Rods 1: Slip-Ring and Bush Combinations for Dynamic-Strain Measurements

Description: "Tests were conducted to develop a slip-ring and brush system that will perform satisfactorily in aircraft-engine, dynamic-strain-measuring applications where resistance-wire strain gages are the means of measuring the strain and to correlate the data obtained from tests in order to provide a basis for predicting the performance of similar slip-ring and brush systems operating under conditions similar to those imposed by these tests." 24 combinations of materials were tested dry and 8 were test… more
Date: March 30, 1945
Creator: Dutee, Francis J.; Phillips, Franklyn W. & Kemp, Richard H.
Item Type: Refine your search to only Report
open access

Wind-Tunnel Tests of a Portion of a PV-2 Helicopter Rotor Blade

Description: From Summary: "A portion of a PV-2 helicopter rotor blade has been tested in the 6- by 6-foot test section of the Langley stability tunnel to determine if the aerodynamic characteristics were seriously affected by cross flow or fabric distortion. The outer portion of the blade was tested as a reflection plane model pivoted about the tunnel wall to obtain various angles of cross flow over the blade. Because the tunnel wall acts as a plane of symmetry, the measured aerodynamic characteristics cor… more
Date: March 29, 1945
Creator: Kemp, William B., Jr.
Item Type: Refine your search to only Report
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