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20,383 Matching Results
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A New Method of Testing in Wind Tunnels
Now, in existing wind tunnels, using a horsepower of 100 to 300, the models are generally made to a 1/10 scale and the speed is appreciably lower than the speeds currently attained by airplanes. The Reynolds number realized is thus 15 to 25 times smaller than that reached by airplanes in free flight, while the ratio of speed to the velocity of sound is between a third and three quarters of the true ratio. The necessary increases in either the diameter of the wind tunnel or the velocity of the airstream are too costly.
Date:
August 1921
Creator:
Margoulis, W.
System:
The UNT Digital Library
Problem of Landing
The author discusses various aspects of landing aircraft such as the actual process of touchdown and the problems associated with the tail skid touching the ground before the landing gear.
Date:
August 1921
Creator:
Pistolesi, E.
System:
The UNT Digital Library
Shape and Strength of Seaplane Under-Structures With Special Regard to Seaworthiness
This report presents experiments and calculations for the purpose of determining the landing gear requirements upon the water. Moving pictures are given which furnish data and also may give both the magnitude and direction of the forces acting. Different classes of seaplanes are examined and proposals for calculation instructions are given.
Date:
August 1921
Creator:
Lewe, Victor
System:
The UNT Digital Library
Commercial Aircraft in War
The difference between aircraft for commercial and wartime uses is delineated, but the interchangability between the two is also discussed. Airships in both roles are also presented.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Coutinho-Sacadura Course Corrector
"The Coutinho-Sacadura course corrector is an instrument with which, knowing the angles of drift of two different courses, we may determine by simple readings: a) direction and velocity of wind; b) correction to be made in course followed by compass, in order to fly in a given direction; c) ground-speed of aircraft, the resultant of its air speed and the velocity of the wind" (p. 1).
Date:
August 1922
Creator:
Cabral, Sacadura
System:
The UNT Digital Library
Description of the Klemperer Wing Strain Meter (Accelerometer)
The wing strain meter enables a pilot to know the strain on lifting surfaces and to warn him of the safe limits which may not be exceeded. In wing strain the most important factors are the force of gravity and the force of lift which gives the measure of the sustaining force, and their components which are perpendicular to the lifting surfaces. This reports methods for using the wing strain meter.
Date:
August 1922
Creator:
unknown
System:
The UNT Digital Library
Illumination of Airways and Landing Fields
Different illumination systems for landing fields are presented which include fixed beacons, signal guns, and light patterns such as T's and crosses. Some of the advantages and disadvantages for each of the lighting patterns are provided.
Date:
August 1922
Creator:
Stadthagen, Paul
System:
The UNT Digital Library
Police Regulation of Aircraft
Different aspects of aircraft regulation are discussed such as: protecting the public; the restriction of flights over crowds; regulations of wing-walkers.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Potentialities of the Parachute
The development of the parachute is presented as well as the future possibilities. The primary topics covered include allowing for wind in design, the parachutes used at balloon exhibitions, parachute use in the war, the delayed-opening type of parachute, and the use of parachutes on commercial airplanes.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Safety in Flight
Report presenting some topics related to safety in flight and the importance of having accurate statistics and information regarding aircraft problems and accidents. Some of the topics provided included perverted statistics, the British accident record, unregulated air traffic in America, and air mail in bad weather.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Structural Safety During Curved Flight
Note presenting an exploration of aircraft safety during curved flight, which leads to more stress on the wings than other types of flight.
Date:
August 1922
Creator:
Rohrbach, Adolf
System:
The UNT Digital Library
Test of Oil Scraper Piston Ring and Piston Fitted With Oil Drain Holes
Tests were conducted to determine whether or not a properly located and properly designed oil scraper piston ring, installed on a piston provided with oil drain holes of sufficient area, would prevent the excessive oiling of the Liberty engine, particularly with the engine running at idling speed with full oil pressure. Results showed that excessive oiling was in fact prevented. It is strongly recommended that scraper rings and pistons be adopted for aircraft engines.
Date:
August 1922
Creator:
McDewell, H. S.
System:
The UNT Digital Library
Test of Specimen of Wood of Longerons of the S.E.5 Airplane After Seven Years' Service
"A transverse test was made of the wood sample using a 5,000 pound Olsen testing machine, the deflection under load being measured by means of a Wissler dial. The results of the transverse test are given and the stress-strain curve is attached" (p. 1).
Date:
August 1922
Creator:
unknown
System:
The UNT Digital Library
Turn Indicator
This report presents a study of an instrument that can warn the pilot of the turning of his airplane. This instrument must satisfy three conditions: 1) It must give useful indication immediately from take-off; 2) The indications must be instantaneous and require no exertion by the pilot; 3) The indicator must be sensitive only to changes of orientation in the horizontal plane. Different solutions are presented such as a gyroscope driven by the suction of a Venturi tube.
Date:
August 1922
Creator:
de Guiche, A. de Gramont
System:
The UNT Digital Library
The twisted wing with elliptic plan form
A method for computing the aerodynamic induction of wings with elliptic plan form if arbitrarily twisted.
Date:
August 1922
Creator:
Munk, Max M.
System:
The UNT Digital Library
The Use of Multiplied Pressures for Automatic Altitude Adjustments
"The efficient performance of an airplane requires that certain adjustments be made as the density of the air through which the airplane passes changes. The safety of the over-dimensioned aircraft engine depends upon careful manipulation of spark advance and throttle opening and a proper control of a variable pitch propeller, if the maximum performance of the supercharged engine is to be obtained. It is evident that there is a real need for satisfactory devices to make such adjustments automatically. Discussed here is a method of automatic compensation which deserves consideration in the design of such devices" (p. 1).
Date:
August 1922
Creator:
Sparrow, Stanwood W.
System:
The UNT Digital Library
Utilization Conditions of Different Types of Airplanes
This report presents examples of different methods of comparing aircraft mathematically. In the example given a biplane and monoplane are compared as to what speed one type of airplane is better at than another.
Date:
August 1922
Creator:
De Marolles
System:
The UNT Digital Library
Absorbing landing shocks
Report discussing tires, steel springs, hydraulic shock absorbers, and axle travel are all examined in relation to absorbing landing shocks.
Date:
August 1923
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Bird Flight: Hints to Be Obtained From It for Use in Aviation
This report is a comprehensive study of birds and how their shapes have been molded by the resistance of the air. 500 species of birds were studied and nearly 30,000 ratios calculated. The author makes a distinction between flapping and soaring flight.
Date:
August 1923
Creator:
Magnan
System:
The UNT Digital Library
Carburetion in Aviation Engines
This report tries to solve the problem of supplying the engine cylinders with a mixture of fuel and air in the right ratio to obtain the greatest power from the engine with the least consumption of fuel.
Date:
August 1923
Creator:
Poincaré
System:
The UNT Digital Library
The Effect of Bow Stiffeners in Nonrigid Airships
"It is now well known that all nonrigid airships constructed at the present time have bow stiffeners consisting of battens curved to the form of the envelope and designed to hold the nose of the ship in its true form despite the very large pressure which exists at the extreme forward point. The effect of the stiffeners is to reduce considerably the apparent pressure which has to be maintained inside the envelope in order to prevent the nose from caving in" (p. 1).
Date:
August 1923
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Engines and Fuels
The report considers the effect on engines of the varying types of fuels now in use. Different types of fuels are examined and the influence of physical characteristics are considered.
Date:
August 1923
Creator:
unknown
System:
The UNT Digital Library
Flight Characteristics
Note presenting some comparative performances of new types of airplanes under the same conditions. The airplanes were compared with some that are already in use and give an accurate idea of the progress shown in the new types.
Date:
August 1923
Creator:
Student
System:
The UNT Digital Library
An instrument for recording the position of airplane control surfaces
N.A.C.A. has developed an instrument which makes a continuous record of the angular position of the control surfaces of an airplane, not only in steady flight but during acrobatics as well. It has proven useful in researches into stability and controllability, and from records obtained from it many otherwise obscure details of piloting technique have been available for the instruction of pilots, from novices to seasoned experts.
Date:
August 1923
Creator:
Ronan, K. M.
System:
The UNT Digital Library