You limited your search to:

 Serial/Series Title: NACA Technical Notes
 Collection: National Advisory Committee for Aeronautics Collection
Icing properties of noncyclonic winter stratus clouds

Icing properties of noncyclonic winter stratus clouds

Date: September 1, 1947
Creator: Lewis, W.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Icing Frequencies Experienced During Climb and Descent by Fighter-Interceptor Aircraft

Icing Frequencies Experienced During Climb and Descent by Fighter-Interceptor Aircraft

Date: July 1, 1958
Creator: Perkins, Porter J.
Description: Data and analyses are presented on the relative frequencies of occurrence and severity of icing cloud layers encountered by jet aircraft in the climb and descent phases of flights to high altitudes. Fighter-interceptor aircraft operated by the Air Defense Command (USAF) at bases in the Duluth and Seattle areas collected the data with icing meters installed for a l-year period. The project was part of an extensive program conducted by the NACA to collect Icing cloud data for evaluating the icing problem relevant to routine operations. The average frequency of occurrence of icing was found to be about 5 percent of the number of climbs and descents during 1 year of operations The icing encounters were predominantly in the low and middle cloud layers, decreasing above 15,000 feet to practically none above 25,000 feet. The greatest thickness of ice that would accumulate on any aircraft component (as indicated by the accretion on a small object) was measured with the icing meters. The ice thicknesses on a small sensing probe averaged less than 1/32 inch and did not exceed 1/2 inch. Such accumulations are relatively small when compared with those that can form during horizontal flight in icing clouds. The light ...
Contributing Partner: UNT Libraries Government Documents Department
Meteorological Analysis of Icing Conditions Encountered in Low-Altitude Stratiform Clouds

Meteorological Analysis of Icing Conditions Encountered in Low-Altitude Stratiform Clouds

Date: March 1, 1951
Creator: Kline, D. B. & Walker, J. A.
Description: Liquid-water content, droplet size, and temperature data measured during 22 flights in predominatly stratiform clouds through the 1948-49 and the 1949-50 winters are presented. Several icing encounters were of greater severity than those previously measured over the same geographical area, but were within the limits of similar measurements obtained over different terrain within the United States. An analysis of meteorological conditions existing during the 74 flights conducted for four winters indicated an inverse relation of liquid-water concentration to maximum horizontal extent of icing clouds. Data on the vertical extent of supercooled clouds are also presented. Icing conditions were most likely to occur in the southwest and northwest quadrants of a cyclone area, and least likely to occur in the southeast and northeast quadrants where convergent air flow and lifting over the associated warm frontal surface usually cause precipitation. Additional data indicated that, icing conditions were usually encountered in nonprecipitating clouds existing at subfreezing temperatures and were unlikely over areas where most weather observing stations reported the existence of precipitation. Measurements of liquid-water content obtained during 12 flights near the time and location of radiosonde observations were compared with theoretical values. The average liquid-water content of a cloud layer, as measured ...
Contributing Partner: UNT Libraries Government Documents Department
Observations of icing conditions encountered in flight during 1948

Observations of icing conditions encountered in flight during 1948

Date: June 1, 1949
Creator: Lewis, W. & Hoecker, W. H., Jr.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Pressure distribution on wing ribs of the VE-7 and TS airplanes in flight

Pressure distribution on wing ribs of the VE-7 and TS airplanes in flight

Date: October 1, 1927
Creator: Rhode, R V
Description: This paper is the first of a series of notes, each of which presents the complete results of pressure distribution tests made by the National Advisory Committee for Aeronautics, on single-wing ribs of the VE-7 and TS airplanes for a particular condition of flight. The level flight results are presented here in the form of curves and show the comparison between the pressure distribution over a representative thin wing, R.A.F.-15, and a moderately thick wing, U.S.A.-27, throughout the range of angle of attack.
Contributing Partner: UNT Libraries Government Documents Department
Note on the air forces on a wing caused by pitching.

Note on the air forces on a wing caused by pitching.

Date: March 1, 1925
Creator: Munk, Max M
Description: The following contains information on the air forces on a wing produced by it's pitching at a finite rate of angular velocity. The condition of smooth flow at the region of the trailing edge is maintained. The wing then experiences the same lift as if moving with the momentary velocity of the rear edge.
Contributing Partner: UNT Libraries Government Documents Department
Airfoil lift with changing angle of attack

Airfoil lift with changing angle of attack

Date: September 1, 1927
Creator: Reid, Elliott G
Description: Tests have been made in the atmospheric wind tunnel of the National Advisory Committee for Aeronautics to determine the effects of pitching oscillations upon the lift of an airfoil. It has been found that the lift of an airfoil, while pitching, is usually less than that which would exist at the same angle of attack in the stationary condition, although exceptions may occur when the lift is small or if the angle of attack is being rapidly reduced. It is also shown that the behavior of a pitching airfoil may be qualitatively explained on the basis of accepted aerodynamic theory.
Contributing Partner: UNT Libraries Government Documents Department
Mass distribution and performance of free flight models

Mass distribution and performance of free flight models

Date: October 1, 1927
Creator: Scherberg, Max & Rhode, R V
Description: This note deals with the mass distribution and performance of free flight models. An airplane model which is to be used in free flight tests must be balanced dynamically as well as statically, e.g., it must not only have a given weight and the proper center of gravity but also a given ellipsoid of inertia. Equations which relate the motions of an airplane and its model are given. Neglecting scale effect, these equations may be used to predict the performance of an airplane, under the action of gravity alone, from data obtained in making dropping tests of a correctly balanced model.
Contributing Partner: UNT Libraries Government Documents Department
Experiments with fabrics for covering airplane wings

Experiments with fabrics for covering airplane wings

Date: April 1, 1923
Creator: Proell, A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The comparison of well-known and new wing sections tested in the variable density wind tunnel

The comparison of well-known and new wing sections tested in the variable density wind tunnel

Date: May 1, 1925
Creator: Higgins, George J
Description: Three groups of airfoils have been tested in the variable density wind tunnel. The first group contains three airfoils. The second group is a systematic series of twenty-seven airfoils. The third group consists of several frequently used wing sections.
Contributing Partner: UNT Libraries Government Documents Department
FIRST PREV 1 2 3 4 5 NEXT LAST