GB682740A - True air-speed computer - Google Patents
True air-speed computerInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009036808A1 (en) * | 2007-09-21 | 2009-03-26 | Senses Ltd. | Timepiece with true airspeed indicator |
-
1950
- 1950-11-23 GB GB28702/50A patent/GB682740A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009036808A1 (en) * | 2007-09-21 | 2009-03-26 | Senses Ltd. | Timepiece with true airspeed indicator |
WO2009037189A1 (en) * | 2007-09-21 | 2009-03-26 | Senses Ltd. | Timepiece with mach number indicator |
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