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Notes on Factors Affecting Geometrical Arrangement of Tricycle-Type Landing Gears

Description: The effects of the geometrical arrangement of tricycle landing gears on various characteristics of an airplane equipped with such landing gear is discussed. The characteristics discussed include directional stability, overturning tendencies, steering and ground handling, shimmy, takeoff, and porpoising. The conclusions are summarized in a table.
Date: April 1937
Creator: Wenzinger, Carl J. & Kantrowitz, A. R.

Notes on longitudinal stability and balance

Description: Report detailing studies of longitudinal stability and balance on five airplanes: the JN4H, DH4, VE7, USAC-11, and Martin Transport. The methods of measurement, methods of correcting instability, and potential modifications for the elevator of the planes is described.
Date: April 1920
Creator: Warner, E. P.

Notes on low-lift buffeting and wing dropping at Mach numbers near 1

Description: From Summary: "A study of the available transonic Mach number data on low-lift buffeting, wing dropping, and changes in the angles of zero lift for symmetrical airfoils indicates that these phenomena are allied and are probably the result of shock-induced separation. The study has indicated that there are combinations of airfoil-thickness ratio, aspect ratio, and sweep which may allow flight through the transonic speed range without experiencing buffet or wing drop at low lift."
Date: March 16, 1951
Creator: Purser, Paul E.

Notes on Mineral Wastes

Description: From Introduction Need of Preventing Mineral Waste: "The purpose of the Bureau of Mines in publishing this report is to call attention to some of the present waste, in the hope that knowledge of the facts may lead to an increased desire to eradicate the wastes, and to greater interest in careful, practical and scientific investigations, through which only can they be overcome."
Date: 1912
Creator: Parsons, Charles L.

Notes on Predicted Fast Neutron Dose from Thermal Neutron Data in Water

Description: Abstract: "An appropriate method has been applied to predict fast neutron dosimeter data from thermal neutron measurements. Results are compared with actual dosimeter data and it is concluded that the method presented gives a good approximation for fast neutron dose. This is important since in many previous experiments fast neutron dosimeter data had not been taken, but thermal neutron data had been obtained."
Date: 1953
Creator: Stone, Henry E.

Notes on propeller design

Description: The best distribution of the thrust over the length of the propeller blade is investigated, taking into account chiefly the slipstream loss and the friction between the blades and the air.
Date: April 1, 1922
Creator: Munk, Max M.

Notes on propeller design III

Description: The air flow and the air force created by all elements of the propeller blades lying in a ring located between two concentric circles around the propeller axis are independent of what happens in other rings.
Date: May 1, 1922
Creator: Munk, Max M.

Notes on specifications for French airplane competitions

Description: Given here are the rules officially adopted by the Aeronautical Commission of the Aero Club of France for a flight competition to be held in France in 1920 at the Villacoublay Aerodrome. The prize will be awarded to the pilot who succeeds in obtaining the highest maximum and lowest minimum speeds, and in landing within the shortest distance.
Date: October 1920
Creator: Margoulis, W.

Notes on the calculation of the minimum horizontal tail surface for airplanes equipped with wing flaps

Description: A method of calculating the horizontal tail area for an airplane equipped with flaps is presented. The general problem of tail design, the effects of flaps on the factors involved, and the manner in which the flaps change the requirements upon which the minimum horizontal tail area is based are discussed.
Date: April 1937
Creator: Soulé, Hartley A.

Notes on the construction and testing of model airplanes

Description: Here, it is shown that the construction of an airplane model can and should be simplified in order to obtain the most reliable test data. General requirements for model construction are given, keeping in mind that the general purpose of wind tunnel tests on a model airplane is to obtain the aerodynamic characteristics, the static balance, and the efficiency of controls for the particular combination of wings, tail surfaces, fuselage, and landing gear employed in the design. These parts must be exact scale reproductions. Any appreciable variation from scale reproduction must be in the remaining parts of the model, i.e., struts, wires, fittings, control horns, radiators, engines, and the various attachments found exposed to the wind in special airplanes. Interplane bracing is discussed in some detail.
Date: January 1922
Creator: Diehl, Walter S.

Notes on the design of ailerons

Description: "Recent data have shown that certain forms or types of ailerons that are in extensive use are in reality quite inefficient and entirely unsuited for the high speeds now realized. The same data indicate that two forms (both shown here) are efficient and satisfactory in every way. The most important characteristics of ailerons are effectiveness under all flight conditions, small moments about the hinge, high efficiency (small yawing moment opposing turn), and simplicity in construction. Information required for the design of ailerons is given for chord, span, area, and plan form" (p. 1).
Date: June 1923
Creator: Diehl, W. S.

Notes on the design of latticed columns subject to lateral loads

Description: No rational column formula has yet been developed which gives results which are sufficiently precise for the design of airplane members, and consequently it is necessary to fall back upon experimental testing. In order to derive the maximum benefit from experiments, however, it is necessary that the experiments be guided by theory. It is the object here to modify existing formulae that may be obtained with a minimum number of tests. A discussion is given that is limited to the case of a simple column supported at both ends and subjected to uniformly distributed loads perpendicular to its axis and to end loads either axially or eccentrically applied. Discussed here are forces in the bracing of latticed columns, the application of theory to practical columns, loads in lattice members, and the strength of individual lattices.
Date: May 1, 1922
Creator: Mccarthy, Charles J