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Caltech Authors (143.226 recursos)

Repository of works by Caltech published authors.

Group = Hydrodynamics Laboratory

Mostrando recursos 1 - 20 de 202

  1. Water Tunnel Investigation of Two-Dimensional Cavities

    Waid, R. L.
    The results of drag measurements on a flat lamina, wedges, a circular cylinder and a scoop channel in two- dimensional cavitating flow in the High Speed Water Tunnel are presented. Cavity geometry data are also included. The results are compared with available theoretical drag coefficients and cavity dimensions.

  2. 3.5" Rotating Rockets with Various Afterbodies

    Knapp, Robert T.; Doolittle, H. L.
    This report is a supplement to Report Section No. 6.1-sr207-1270, dated April 21, 1944, and coves tests conducted at the High Speed Water Tunnel at the California Institute of Technology. This work was authorized by a letter of January 31, 1944, from Dr. E. H. Colpitts, Chief of Section 6.1, National Defense Research Committee, New York City. The purpose of these tests was to determine the effect, on performance, of several different types of afterbodies. The first tests of this rocket showed that there was a slight stabilizing moment at very small yaw angles. this stabilizing moment had an undesirable effect...

  3. Water Tunnel Tests of the Hydrobomb

    Knapp, Robert T.; Doolittle, Harold L.
    This report covers Water Tunnel tests of a 2" diameter model of the hydrobomb, conducted at the Hydraulic Machinery Laboratory at the California Institute of Technology. This work was authorized by Dr. E. H. Colpitts, Chief of Section 6.1, NDRC, as a part of Project OD-99. The purpose of the tests was to determine the drag, cross force, moment, and center-of-pressure eccentricity for various settings of the vertical and horizontal rudders, and also the extent to which these rudders are effective in controlling the torpedo. Runs were also made to determine the cavitation effects produced under the specified operating conditions, namely,...

  4. Hydrodynamics Characteristics of the 500 Pound T16 S. P. Bomb

    Knapp, Robert T.; Robison, Gerald B.
    Reported herein are tests of the 500 pound T 16 S. P. Bomb covering the hydrodynamic force coefficients with and without cavitation, incipient cavitation characteristics, and flow lines as revealed in the Polarized Light Flume. It was not possible to cause full cavitation with present water tunnel limitations.

  5. Water Tunnel Tests of the MK 25 Torpedo with Gas Exhaust through a Vertical Fin

    Knapp, Robert T.; Doolittle, Harold L.
    This report covers tests of a 2" diameter model of the Mk 25 Torpedo conducted at the Hydraulic Machinery Laboratory of the California Institute of Technology. This work was undertaken as a part of Project NO-176. The purpose of the tests was to determine the effect of the discharge of exhaust through an orifice in the top edge of the vertical fin. Tests were made with and without a shroud ring fitted over the outside of the fins. The model was mounted in the High Speed Water Tunnel with suitable arrangements to pass a measured quantity of gas through the...

  6. Flow Around XBT2D Airplane with a 2,000 Pound G.P. Bomb

    Knapp, Robert T.; Robison, Gerald B.
    Flight tests of the XBT2D-1 Airplane with 2,000 pound G. P. Bomb externally attached to the fuselage resulted in serious buffeting at critical air speeds. In a memorandum from the Bureau of Ordnance, U. S. Navy, dated 13 May, 1946, the Hydrodynamics Laboratory at the California Institute of Technology was requested to make Polarized Light Flume studies and cavitation tests on a model. The object of the tests was, originally, to obtain information helpful in eliminating such buffeting.

  7. Water Tunnel Tests of the 4.5" Rocket Projectile with Three Different Fin Tails and One Ring Type Tail

    Knapp, Robert T.
    The High Speed Water Tunnel is operated by the California Institute of Technology under Contract OEMsr-207 and is sponsored by Division 6, Section 6.1 of the NDRC. The tests reported in this memorandum were made at the request of Dr. C. N. Hickman of the NDRC. The report covers water tunnel tests of a 2" diameter model of the 4.5" Rocket Projectile with three different collapsible fin tails and one ring type tail. The drag, crosswind force, and the moment acting on the models were measured and the locations of the center-of-pressure were calculated for various yaw angles.

  8. MK25 Torpedo Exhaust Gas Investigation

    Knapp, Robert T.; Doolittle, Harold L.
    This report covers tests made on models of the Mk 25 Torpedo to determine the effect of gas discharged in the vicinity of a power-driven propeller. It also covers, briefly, tests made on a double exhaust pipe and a single exhaust pipe, both with the vertical rudder set at 10° port but without propeller. All of the above was authorized by Dr E. H. Colpitts, Chief of Section 6.1, NDRC, in a letter dated May 4, 1944. This report is the fourth supplement to the report, Section No. 6.1-sr207-1275. Memorandum Reports dated June 22, 1944, July 15, 1944, and September...

  9. Pressure Distribution Measurements on the Mark 25 Torpedo

    Knapp, Robert T.; Levy, Joseph
    This report covers measurements of the pressure distribution around the body of the Mk 25 Torpedo equipped with a shroud ring tail) and includes studies of the effect on the pressure distribution of variations in yaw and pitch angles, velocity, and static pressure (i. e., submergence) The tests were made on a 2-inch diameter model (model scale 1 to 11.2). In addition to providing a general picture of the pressure distribution as affected by the different variables) the data presented herein are useful in determining the best locations and arrangements for the pressure intakes to the immersion mechanism and to the...

  10. MK. 25 Torpedo with Various Exhaust Pipes

    Knapp, Robert T.; Doolittle, Harold L.
    [no abstract]

  11. Water Tunnel Tests of the M7, 2.36" A.T. Rocket

    Knapp, Robert T.
    This report covers water tunnel tests of a 2.36" rocket projectile with several variations in profile of nose and with two types of tail; a folding fin tail and a fixed shroud ring tail. The hydrodynamic forces, drag, cross wind force, and moment acting on the projectile, were measured and the locations of the center-of- pressure were calculated for the various combinations of noses and tails and at various velocities and yaw angles.

  12. Force Tests of the United Shoe Machinery Corp. No. 8 Hydrobomb

    Knapp, Robert T.; Robison, Gerald B.
    Force and cavitation tests of the United Shoe Machinery Corporation Hydrobomb, Design No. 8, are reported herein. There were two basic models, one having 28-inch fin span for both horizontal and vertical fins , and one with 28-inch vertical and 34-inch horizontal fin span. Seven models were actually tested, namely, one finless , 23-inch and 34-inch fin spans without rings, 28-inch and 34-inch fin spans with 10-degree cone angle rings, and 28-inch and 34-inch fin spans with 5-degree cone angle rings.

  13. The Hydrodynamics of the Free-Surface Water Tunnel

    O'Neill, J. P.
    Free-surface water tunnels are used to determine the hydrodynamic characteristics of bodies which move in water near the surface. To develop the basic principles for the design and operation of such a tunnel the conditions for dynamic similitude near an air-water interface are analyzed. Although the tests should determine how the hydrodynamic characteristics are affected by the surface waves produced by the body itself, the dimensions and conditions of operation of the test channel are sometimes responsible for disturbances that interfere with the interpretation of the local wave effect. In order to record the type of interfering waves that might...

  14. Cavitation Noise from Underwater Projectiles

    Knapp, Robert T.; Daily, James W.; Baller, Howard
    This report describes measurements of high frequency noise produced by projectiles cavitating in a high velocity stream of water. Spherical and ellipsoidal focusing reflectors were used in conjunction with a Brush CC-11A hydrophone to locate the noise source.

  15. Water Tunnel Tests of the 7.2 Chemical Rocket

    Knapp, Robert T.; Doolittle, H. L.
    This report covers tests of a 2" diameter model of the 7.2" Chemical Rocket to determine its performance and possible means of increasing stability and reducing dispersion. The rocket was tested with the two original tails, the ring tail designated herein as No. 61 and the ring tail with extended fins designated No. 62. Three other tail designs were tested designated No. 63, No. 67, and No. 68. Of these, No. 67 was the only one that produced results superior to the No. 61 and No. 62 designs. This No. 67 Tail has extended fins similar to Tail No. 62 and...

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

    Knapp, Robert T.
    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.

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

    Knapp, Robert T.
    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.

  18. Water Tunnel Tests of the British "Squid" Projectile Type "C" with Two Alternate Flat Noses

    Knapp, Robert T.; Doolittle, H. L.
    This report covers tests to determine the performance of the "Squid" with three designs of nose, designated No. 42, No 45, and No 46. Practically the only difference in the three noses is in the diameter of the flat face, these diameters being 7.90", 8.93", and 9.95", respectively

  19. Water Tunnel Tests of the M6, 2.36" A.T. Rocket

    Knapp, Robert T.
    This report covers Water Tunnel tests of a 2.36" rocket projectile with three types of shroud ring tail. Two of the tails are attached by channel section supporting fins to a stepped nozzle, the fins on one of them being stepped to fit the nozzle contour. The third tail has a streamlined nozzle with smooth supporting fins and shroud ring. The results are given of tests with different shroud lengths on the ring tails with the channel section supporting fins.

  20. Memorandum on Water Tunnel Tests of a 2.37" Rocket Projectile with Collapsible Type Tails

    Knapp, Robert T.
    This report covers water tunnel tests of a full scale 2.37" rocket projectile (designated in the laboratory as projectile number ND-11 Impervium) with four different collapsible tails. The purpose of the tests was to compare the drag coefficients for this projectile using each of the collapsible tails with the drag coefficient for the projectile using its original fixed-fin tail, and to determine the effect of the collapsible type tail on the center-of-pressure location.

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