The accuracy of the instruments used for flight test measurements has been inadequate so a new series of tests were commissioned with the development of an accurate elevator setting recorder.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
An electromagnetic flowmeter has been adjusted to minimize the errors inherent in measuring the flow of low conductivity fluids. This is done through use of a direct-coupled, differential cathode follower, whose grid potential is adjustable with respect to ground levels.
Topic: NASA Technical Reports Server (NTRS)
This device for simplifying the plotting of a Veitch diagram consists of several overlays for blocking out the unwanted squares. This method of plotting the various input combinations to a computer is used in conjunction with the Boolean functions.
Topic: NASA Technical Reports Server (NTRS)
Electrical-resistance strain gauges - high strain response, hysteresis, strain sensitivity, creep, zero drift & resistance at cryogenic temperatures
Topic: NASA Technical Reports Server (NTRS)
Aerodynamic characteristics of canopy paraglider for instrument recovery - mach number, angle of attack, sideslip angle
Topic: NASA Technical Reports Server (NTRS)
Wind-tunnel investigation of longitudinal and lateral aerodynamic characteristics of hypersonic glider with several booster configurations
Topic: NASA Technical Reports Server (NTRS)
Tests of polymers containing silicon & nitrogen in space temperatures
Topic: NASA Technical Reports Server (NTRS)
V/tol aircraft flight test with unshrouded propellers - static & dynamic stability during hovering & flying
Topic: NASA Technical Reports Server (NTRS)
Geomagnetic implications of cosmic ray diurnal variation and spectrum
Topic: NASA Technical Reports Server (NTRS)
A lightweight, metal bending brake ensures very accurate bends. Features of the brake that adapt it for making complex reverse bends to close tolerances are a pronounced relief or cutaway of the underside of the bodyplate combined with modification in the leaf design and its suspension.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
This report summarizes the full-scale engine tests of pentaborane, pentaborane - JP-4 fuel mixtures, and trimethylborate azeotrope fuel. The tests were conducted in a full-scale turbojet engine at a simulated altitude of 50,000 feet and Mach number of 0.08. Engine speeds were 90 to 100 percent of rated speed. Pentaborane reduced the the specific fuel consumption to two-thirds that of JP-4 fuel. However, because boron oxide collected in the engine, the performance deteriorated with continued...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
This report presents the results of tests on two-stroke-cycle Diesel engines to determine the efficiency of the crank case scavenging pump. It was determined that efficiencies were between 95 and 100%.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
The transonic aerodynamic characteristics of wings of finite span are discussed from the point of view of a unified small perturbation theory for subsonic, transonic, and supersonic flows about thin wings. This approach avoids certain ambiguities which appear if one studies transonic flows by means of equations derived under the more restrictive assumption that the local velocities are everywhere close to sonic velocity. The relation between the two methods of analysis of transonic flow is...
Topic: NASA Technical Reports Server (NTRS)
A method of analysis based on slender-wing theory is developed to investigate the characteristics in roll of slender cruciform wings and wing-body combinations. The method makes use of the conformal mapping processes of classical hydrodynamics which transform the region outside a circle and the region outside an arbitrary arrangement of line segments intersecting at the origin. The method of analysis may be utilized to solve other slender cruciform wing-body problems involving arbitrarily...
Topic: NASA Technical Reports Server (NTRS)
In this report a formula is developed that enables the determination of the proper design load for the portion of the wing forward of the front spar. The formula is inherently rational in concept, as it takes into account the most important variables that affect the leading-edge load, although theoretical rigor has been sacrificed for simplicity and ease of application. Some empirical corrections, based on pressure distribution measurements on the PW-9 and M-3 airplanes have been introduced to...
Topic: NASA Technical Reports Server (NTRS)
Results of flight tests of the performance and cooling characteristics of three NACA D cowlings and of a conventional NACA D cowling on the XP-42 airplane are summarized and compared. The D cowling is, in general, characterized by the use of an annular inlet and diffuser section for the engine-cooling air. The D cowlings tested were a long-nose high-inlet-velocity cowling, a short-nose high-inlet-velocity cowling, and a short-nose low inlet-velocity cowling. The use of wide-chord propeller...
Topic: NASA Technical Reports Server (NTRS)
A solution is presented for the problem of the compressive buckling of simply supported, flat, rectangular, solid-core sandwich plates stressed either in the elastic range or in the plastic range. Charts for the analysis of long sandwich plates are presented for plates having face materials of 24s-t3 aluminum alloy, 76s-t6 alclad aluminum alloy, and stainless steel. A comparison of computed and experimental buckling stresses of square solid-core sandwich plates indicates fair agreement between...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
An investigation was made in the Langley low-turbulence pressure tunnel to determine the effect of size and location of a sandpaper type of roughness on the Reynolds number for transition. Transition was observed by means of a hot-wire anemometer located at various chordwise stations for each position of the roughness. These observations indicated that when the roughness is sufficiently submerged in the boundary layer to provide a substantially linear variation of boundary-layer velocity with...
Topic: NASA Technical Reports Server (NTRS)
Results are presented of an experimental investigation made of the applied ground loads and the coefficient of friction between the tire and the ground during the wheel spin-up process in impacts of a small landing gear under controlled conditions on a concrete landing strip in the Langley impact basin. The basic investigation included three major phases: impacts with forward speed at horizontal velocities up to approximately 86 feet per second, impacts with forward speed and reverse wheel...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Wing section outboard of flap was tested by wake surveys in Mach range of 0.25 - 0.78 and lift coefficient range 0.06 - 0.69. Results indicated that minimum profile-drag coefficient of 0.0097 was attained for lift coefficients from 0.16 to 0.25 at Mach less than 0.67. Below Mach number at which compressibility shock occurred, variations in Mach of 0.2 had negligible effect on profile drag coefficient. Shock was not evident until critical Mach was exceeded by 0.025.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Drop hammer tests with different shock strut models and shock strut oils were performed at temperatures ranging to -40 C. The various shock strut models do not differ essentially regarding their springing and damping properties at low temperatures; however, the influence of the different shock strut oils on the springing properties at low temperatures varies greatly.
Topic: NASA Technical Reports Server (NTRS)
A spin-tunnel investigation of a 1/26 scale model of the Douglas XTB2D-1 airplane has been conducted in the Langley 20-foot free-spinning tunnel. The effects of control settings and movements upon the erect- and inverted-spin and recovery characteristics of the model were determined for various loading conditions. Tests were also performed to determine the effects of various tail modifications. The investigation included emergency spin-recovery parachute tests as well as crew-escape and rudder-...
Topic: NASA Technical Reports Server (NTRS)
The general solution is obtained of the equations of motion of a viscous fluid in which the velocity field is inversely proportional to the distance from a certain point. Some particular cases of such motion are investigated.
Topic: NASA Technical Reports Server (NTRS)
An experimental investigation has been conducted to determine the effect of the wall boundary layer upon the performance of an axial-flow fan rotor.
Topic: NASA Technical Reports Server (NTRS)
A wind-tunnel investigation was made to determine the effects of ejecting high-velocity air near the leading edge of plain trailing-edge flaps on a 35 degree sweptback wing. The tests were made with flap deflections from 45 degrees to 85 degrees and with pressure ratios across the flap nozzles from sub-critical up to 2.9. A limited study of the effects of nozzle location and configuration on the efficiency of the flap was made. Measurements of the lift, drag, and pitching moment were made for...
Topic: NASA Technical Reports Server (NTRS)
It is shown that the force distribution resulting from incomplete ribs in single spar wing structures may be determined with the aid of the shear field method by a statistically indeterminate computation. A numerical computation is given of the force distribution of a wing structure whose two neighboring incomplete ribs with web missing in half the section are torsionally loaded.
Topic: NASA Technical Reports Server (NTRS)
This analysis computes for a predetermined airfoil and given Reynolds Number the course of the "displacement thickness," i.e., the course of the layer by which the streamlines of the potential flow are pushed away from the wing through the frictional layer. The result is, to a certain extent, a new wing contour.
Topic: NASA Technical Reports Server (NTRS)
The present paper describes a device whereby rapid flame movement within an internal-combustion engine cylinder may be recorded and determined. By the aid of a simple cylindrical contact and an oscillograph the rate of combustion within the cylinder of an airplane engine during its normal operation may be measured for gas intake velocities of from 30 to 35 m/s and for velocities within the cylinder of from 20 to 25 m/s. With it the influence of mixture ratios, of turbulence, of compression...
Topic: NASA Technical Reports Server (NTRS)
This report continues the work presented in NACA-TM 605 and expands the scope to include the change in specific number of wrinkles from direction x to z, so that b and f become variable in direction z. Moreover, it seems likely that b and f increase from the edge toward the center if the sheet is infinitely thin.
Topic: NASA Technical Reports Server (NTRS)
