GB682740A - True air-speed computer - Google Patents

True air-speed computer

Info

Publication number
GB682740A
GB682740A GB28702/50A GB2870250A GB682740A GB 682740 A GB682740 A GB 682740A GB 28702/50 A GB28702/50 A GB 28702/50A GB 2870250 A GB2870250 A GB 2870250A GB 682740 A GB682740 A GB 682740A
Authority
GB
United Kingdom
Prior art keywords
scale
temperature
scales
airspeed
disc
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
Application number
GB28702/50A
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.)
FRANZ JOSEF AUGUST HUBER
Original Assignee
FRANZ JOSEF AUGUST HUBER
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 FRANZ JOSEF AUGUST HUBER filed Critical FRANZ JOSEF AUGUST HUBER
Publication of GB682740A publication Critical patent/GB682740A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/0005—Hand manipulated computing devices characterised by a specific application
    • G06G1/0052—Hand manipulated computing devices characterised by a specific application for air navigation or sea navigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
    • G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
    • G01P5/17—Coupling arrangements to the indicating device
    • G01P5/175—Coupling arrangements to the indicating device with the determination of Mach number
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/14—Hand manipulated computing devices in which a straight or curved line has to be drawn from given points on one or more input scales to one or more points on a result scale

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

682,740. Calculating-apparatus. HUBER, F. J. A. Nov. 23, 1950 [Nov. 29, 1949], No. 28702/50. Class 106 (i). A logarithmic device for evaluating the true airspeed of an aircraft from the indicated airspeed, temperature and pressure altitude takes account of impact temperature rise at the thermometer. An evaluation is made with two settings, and Mach number and temperature rise are also shown. A circular form of the device comprises a pair of concentrically-pivoted discs 20 and 21 with a transparent radial cursor 23. Continguous logarithmic pressure scales 33 and 45 are marked off on the two discs, the former for setting the indicated airspeed (impact pressure) and the latter the indicated altitude (static pressure). The ratio of these two pressures is the Mach number and is shown directly on a scale 32 on the larger disc 20 at a reference mark 41 on a projecting portion 40 of the smaller disc, after adjusting the two discs to bring the instrument readings of airspeed and altitude on the scales 33 and 45 into coincidence. For a given Mach number the true airspeed depends only on temperature. A temperature scale 43 is therefore provided on the smaller disc and the cursor 23 is set to this scale to show the true airspeed on a scale 30 on the larger disc. To correct for temperature rise at the thermometer, the indicated temperature indicia of the scale 43 comprise a system of isothermal curves on a transparent panel provided on the smaller disc, and a reference curve 35 is marked on the larger disc to intersect the indicia 43 variably according to Mach number, the temperature scale being read along the curve 35 at its intersection with the indicia 43. The curve 35 is, for convenience, a spiral and the scales 43 and 30 are marked off accordingly. A scale 31 shows the temperature rise at the setting of the cursor. The Specification quotes formulµ for laying off the various scales and shows how they are developed from standard formulµ relating the factors involved. The scales can be computed for either subsonic or supersonic speed ranges only, or for both ranges. In the latter case the pitot tube position error, which would normally be taken account of in the subsonic range, can be omitted in order to maintain continuity.
GB28702/50A 1949-11-29 1950-11-23 True air-speed computer Expired GB682740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US682740XA 1949-11-29 1949-11-29

Publications (1)

Publication Number Publication Date
GB682740A true GB682740A (en) 1952-11-12

Family

ID=22081529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28702/50A Expired GB682740A (en) 1949-11-29 1950-11-23 True air-speed computer

Country Status (1)

Country Link
GB (1) GB682740A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009037189A1 (en) * 2007-09-21 2009-03-26 Senses Ltd. Timepiece with mach number indicator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009037189A1 (en) * 2007-09-21 2009-03-26 Senses Ltd. Timepiece with mach number indicator
WO2009036808A1 (en) * 2007-09-21 2009-03-26 Senses Ltd. Timepiece with true airspeed indicator

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