US2382974A - Method for producing streamlined models - Google Patents

Method for producing streamlined models Download PDF

Info

Publication number
US2382974A
US2382974A US471740A US47174043A US2382974A US 2382974 A US2382974 A US 2382974A US 471740 A US471740 A US 471740A US 47174043 A US47174043 A US 47174043A US 2382974 A US2382974 A US 2382974A
Authority
US
United States
Prior art keywords
streamlined
models
producing
model
medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US471740A
Inventor
William H Caraway
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US471740A priority Critical patent/US2382974A/en
Application granted granted Critical
Publication of US2382974A publication Critical patent/US2382974A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/08—Aerodynamic models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B71/00—Designing vessels; Predicting their performance
    • B63B71/20—Designing vessels; Predicting their performance using towing tanks or model basins for designing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels

Definitions

  • This invention relates to a method for developing streamlined forms offering the least resistance to fluid flow.
  • Fig. 1 is a plan view of a model boat incorporating the features of the invention.
  • Fig. 2 isa cross-section taken along the line 2--2 of Fig. l.
  • the rough form thus provided is then covered with a material which is soluble or erosible ,in thatparticular medium.
  • the form is then placed under conditions analogous to the conditions for which it is designed and the medium will wear away itssurface in conformity with the pressure.
  • the model After the model has been in the basin a suflicient length of time, it is removed and can be used as a mould for producing further test models or, if
  • the dimensions may be taken directly from it and suitably scaled for use in a full sized boat.
  • a block of the solidified water soluble or erosible material may be roughed out and the approximate the final form.
  • the strengthening members 3 and 5 are placed in position and the test carried out as described above.
  • the coating or hull may be made of a relatively soft material such as talc or chalk and subjected to an air blast containing fine abrasive particles such as sand,
  • a method for producing streamlined forms comprising the steps of shaping a base of rigid 3 material to approximate form, coating the base with a water soluble resin, floating the coated base in a water medium, and effecting a flow of thewater medium past said coated base under controlled conditions of displacement and relative velocities between said base and said medium, whereby areas of the coating offering highresistance are removed at a greater rate than areas offerin low resistance.

Description

Aug. 21, 1945. w. H. CARAWAY ,9
METHOD FOR PRODUCING STREAMLINED MODELS Filed Jan. 8, 1943 FigJ.
W|LL|AM H CARAWAY Patented Aug. 21, 1945 UNITED STATESPATENT OFFICE METHOD FOR PRODUCING STREAMLINED MODE s William H. Caraway, Sugar Land, Tex. Application January s, 1943, Serial No. 471,740 1 Claim. (01. 73-143) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G."75'7) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without payment tome of any royalty thereon.
This invention relates to a method for developing streamlined forms offering the least resistance to fluid flow.
It is an object of this invention to provide a method whereby the optimal streamlined form may be determined in a minimum time and with a minimum effort.
This and other objects and advantages of my invention will become apparent upon a consideration of the following description and the accompanying drawing, in which:
Fig. 1 is a plan view of a model boat incorporating the features of the invention; and
Fig. 2 isa cross-section taken along the line 2--2 of Fig. l.
I prefer to use as a base for the model a form cut roughly to shape andprovided with means whereby it may be supported in the medium in which it is designed to operate. The rough form thus provided is then covered with a material which is soluble or erosible ,in thatparticular medium. The form is then placed under conditions analogous to the conditions for which it is designed and the medium will wear away itssurface in conformity with the pressure.
variations created by the flow. Since the erosive wooden coating II of a water soluble material is placed water passed by the model while it is held stationary or the model may be towed in the basin.
After the model has been in the basin a suflicient length of time, it is removed and can be used as a mould for producing further test models or, if
desired, the dimensions may be taken directly from it and suitably scaled for use in a full sized boat.
. Under some circumstances it may be desirable to omit the roughed-out woodenform. In this center hollowed out forming a hull which willeffect of the water is proportional to the resistance offered, the wearin away will be greatest at the areas of highest resistance and consequently the finalform taken by the model will be that which affords the least resistance to the flow of the medium. This wearing away will automatically shape the model into the optimal streamlined form.
l While my invention has particular applicability to thedesign of boats, it is clear that it is equally adaptable to other devices subjected to fluid stream flow such as aeroplane wings, fuselages,
or the like. However, for the purposes of clarity and understanding of my invention, thefollowing description will belimited to its application to boats. l d
Referring to the figures, the numeral l repre case, a block of the solidified water soluble or erosible material may be roughed out and the approximate the final form. The strengthening members 3 and 5 are placed in position and the test carried out as described above.
-Where the object to be streamlined is intended for use in a gaseous medium, the coating or hull may be made of a relatively soft material such as talc or chalk and subjected to an air blast containing fine abrasive particles such as sand,
emery, or the like.
While I have described my invention with particularity, it is to be understood that I do not Wish to be limited to the particular details and sents the hull of the roughed out model which is provided with strengthening ribs ,3 and cross strengthening members 5. to .Whichthesecuring device I may be attached. If it is desired to place the model in a basin and have it towed through the water, either the securing device 1 may be used or a line may be attached to the eye-bolt 9.
Over the outside of the hull a relatively thick arrangements disclosed since various modifications within the spirit of the invention will suggest themselves toone skilled in the art.
. Having thus described my invention, what I claim as new and wish to secure by Letters Patcut is:
A method for producing streamlined forms comprising the steps of shaping a base of rigid 3 material to approximate form, coating the base with a water soluble resin, floating the coated base in a water medium, and effecting a flow of thewater medium past said coated base under controlled conditions of displacement and relative velocities between said base and said medium, whereby areas of the coating offering highresistance are removed at a greater rate than areas offerin low resistance.
WILLIAM H. CARAWAY.
US471740A 1943-01-08 1943-01-08 Method for producing streamlined models Expired - Lifetime US2382974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US471740A US2382974A (en) 1943-01-08 1943-01-08 Method for producing streamlined models

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US471740A US2382974A (en) 1943-01-08 1943-01-08 Method for producing streamlined models

Publications (1)

Publication Number Publication Date
US2382974A true US2382974A (en) 1945-08-21

Family

ID=23872810

Family Applications (1)

Application Number Title Priority Date Filing Date
US471740A Expired - Lifetime US2382974A (en) 1943-01-08 1943-01-08 Method for producing streamlined models

Country Status (1)

Country Link
US (1) US2382974A (en)

Similar Documents

Publication Publication Date Title
Gertler Resistance experiments on a systematic series of streamlined bodies of revolution: for application to the design of high-speed submarines
US2382974A (en) Method for producing streamlined models
EA016035B1 (en) Cruciform tail control surfaces of an undersea vehicle
Parkin et al. Experiments on Circular Arc and Flat Palte Hydrofoils in Noncavitating and Full Cavity Flows
GB980437A (en) Ship hull form
Chu et al. Hydrodynamic Theories of Ship Slamming Review and Extension
GB1034370A (en) Method and means for preventing flow-separation alongside ships' hulls in motion
GB1119152A (en) Method and apparatus for drag reduction on water-borne vehicles
Cho et al. Parametric Designs of a Pre-swirl Duct for the 180,000 DWT Bulk Carrier Using CFD
Tanaka et al. A study on the bilge keels part 1. two dimensional model experiments
Kawabuchi et al. Development of technology to estimate the flow field around ship hull considering wave making and propeller rotating effects
Pierson On the virtual mass of water associated with an immersing wedge
GB757592A (en) Forming anti-corrosive surface coatings on metals
Chun-Ki et al. Study on the Imp rovement of the Accuracy of Fishing Vessels Maneuverability Prediction
Yokoo et al. Comparison of wake distributions between ship and models
Kim et al. Nominal wake measurement for KVLCC2 model ship in regular head waves at fully loaded condition
GB1088668A (en) Improvements relating to pleasure craft for use on water
KAWAMURA A Note on the detached Shock Wave in front of a Body
Blaurock et al. Measurements of the time dependent velocity field surrounding a model propeller in uniform water flow
SMITH A simple model for solar wind flow(magnetic field calculation between bow shock and magnetopause)
MCFADDEN An artificial viscosity method for the design of supercritical airfoils[Ph. D. Thesis]
Lee et al. Effect of Flow Liners on Ship′ s Wake Simulation in a Cavitation Tunnel
ROTH A theory of calculation of flutter vibrations in subsonic flows(Critical flutter velocity for membrane in nonconservative system)
DILLON A wind tunnel and computer investigation of the low speed aerodynamic characteristics of the prone escape system(PRESS)(M. S. Thesis)
BURTNESS Pressure distributions and losses in a waterjet propulsion system(Final Report, 15 Sep. 1983- 14 Sep. 1986)