Force and cavitation characteristics of the NACA 4412 hydrofoil

This report covers Water Tunnel measurements of the infinite aspect ratio characteristics and cavitation characteristics of a hydrofoil section. The profile tested is identical to the 4412 airfoil section of the National Advisory Committee for Aeronautics and is called the NACA 4412 hydrofoil in this report. Measurements and observations include lift, drag, and pitching moment and the inception and development of cavitation as functions of the angle of attack, velocity, and pressure of the flow. The purpose of this report is to present these measurements of the characteristics of this section in water, to compare the results with other available information on this shape, and to evaluate the Water Tunnel method for obtaining the complte hydrodynamic characteristics of hydrofoils

A study of community relations problems and their relations to the public relations function of community colleges (Utica College, Utica, N.Y.)

Thesis (M.S.)--Boston Universit

Water Tunnel Tests of the British Squid Projectile Type "C"

This report covers Water Tunnel tests on a 2" diameter model of the "Squid" or British Type "C" Projectile. These tests were conducted for the purpose of determining the performance characteristics of the projectile as well as cavitation effects with varying water pressure. The work was done at the joint request of the British Admiralty Delegation and the Bureau of Ordnance

Cavitation Mechanics and its Relation to the Design of Hydraulic Equipment

The objective of this lecture is to outline the various characteristics of the cavitation phenomenon and to point out in general how this knowledge may be used to alleviate and, in some cases, to eliminate the losses due to damage of materials and decrease in performance of hydraulic equipment. It is shown that difficulty with cavitation is encountered over the entire field of hydrodynamics but that, although the manifestations may appear to differ widely, they can usually be understood on the basis of present concepts of the mechanics of cavitation. It is found that such understanding usually brings with it suggestions of methods for lessening or eliminating the difficulty

Water Tunnel Tests of the M-6, 2.36" A. T. Rocket with Five Designs of Shroud Tail

This report covers tests on the M-6, 2.36" rocket with the conical pointed nose in combination with on experimental shroud ring toil from the Aberdeen Ballistic Research Laboratory, also with a commercially manufactured Ordnance Deportment shroud ring tail, and with three types of specially made model tails on which the shroud length was varied. One of the specially made model tails was mounted on a plain boom with no nozzle. All of the other tails were mounted on a stepped venturi nozzle

Water Tunnel Tests of the An-MK.41 Bomb

The High Speed Water Tunnel is operated by the California Institute of Technology under Contract OEMsr-207 with the OSRD and is sponsored by Division 6, Section 6.1 of the NDRC. The tests reported in this memorandum were made at the request of the U. S. Navy Department, Bureau of Ordnance as a part of Navy Project ND-141. The report covers water tunnel tests of a 2" diameter model of the 15" AN-MIC. 41 Bomb (Model Scale Ratio 7.5 to 1), and several modifications of this bomb. The hydrodynamic forces, the drag, crosswind force, and the moment, acting on the projectiles were measured and the locations of the center-of-pressure were calculated for various velocities and yaw angles

New apparatus for determination of size distribution of particles in fine powders

Every year a greater need for accurate analysis of the size distribution of subsieve material is being felt by the engineer, because of the increasingly vital part it plays in the manufacture of cement, pigments, and other powdered products. Sieves are a satisfactory means of obtaining this information as long as the material is relatively coarse, but when from 70 to 95 per cent of the sample passes the 200-mesh screen (the finest one giving consistent reading), some new scheme of analysis must be used. Several methods of analyzing this fine fraction have been developed. For example, Professor Work at Columbia has perfected an excellent microscope technic. Elutriation and sedimentation methods employing various fluid media have been shown to be feasible, and additional methods are constantly being developed, but most of them are slow and tedious

Present Status of Cavitation Research

[no abstract

Drag Tests of the British Squid

The purpose of this report is to correlate the subject matter of Memorandum Reports M-24 and M-24.1. The purpose of the Memorandum Report M-24 December 8, 1944 was to obtain the drag coefficients for the model with a correctly proportioned tail. The purpose of Memorandum Report M-24.1, December 11, 1944, was to determine the drag coefficients of a true model of the current production type, with a new nose, at high K values, that is, at high pressures