Airspeed indicator

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Topic: Airspeed indicator

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	Airspeed - Wikipedia, the free encyclopedia
		Indicated airspeed (IAS) is the speed as measured by the aircraft's sensors, and displayed on the airspeed indicator.
		Indicated airspeed is derived by subtracting the static air pressure, as detected at the static ports on one or both sides of the aircraft, from the dynamic air pressure, usually detected by the pitot tube which is mounted facing forward.
		Airspeed refers to the speed of an aircraft in relation to the air; it is nearly always different from ground speed, the speed of the aircraft in relation to the ground.
	en.wikipedia.org /wiki/Airspeed (492 words)

	Airspeed indicator - Wikipedia, the free encyclopedia
		During instrument flight, the airspeed indicator is the primary instrument of reference for pitch control during climbs and descents, and a secondary instrument of reference for pitch control during cruise and turns.
		The airspeed indicator is an instrument used in an aircraft to display the craft's airspeed, typically in knots, to the pilot.
		Along with the altimeter and vertical speed indicator, the airspeed indicator is a member of the pitot-static group of aviation instruments, so named because they operate by measuring pressure in the pitot and static circuits.
	en.wikipedia.org /wiki/Airspeed_indicator (929 words)

	Types of Airspeed
		Aircraft that operate at high altitudes use Mach number, not airspeed, as a reference for aircraft performance and navigation, because the airspeed indicator is subject to many errors at high speeds in the thin air of the upper atmosphere.
		For example, at cruise altitude, the airspeed indicator on the Boeing 737-400 may indicate about 280 knots when the airplane's actual speed through the air is more than 400 knots.
		Indicated airspeed drops as you climb, because as the density of the air decreases with altitude, fewer air molecules hit the pitot tube.
	www.abbysenior.com /aviation/typesof.htm (445 words)

	Indicator_Types.htm
		The airspeed indicator is a hollow diaphragm connected to the Pitot tube.
		your wing with you in it IS an indicated airspeed indicator.
		The airspeed indicator operates by air pressure transmitted from the Pitot-static tube.
	expandingknowledge.com /Jerome/PG/Talk/Air/Speed/Indicator_Types.htm (1937 words)

	3-4
		The airspeed indicator is a sensitive, differential pressure gauge which measures and shows promptly the difference between (1) pitot, or impact pressure, and (2) static pressure, the undisturbed atmospheric pressure at level flight.
		It may be important to refer to the airspeed calibration chart to correct for possible airspeed errors because airspeed limitations such as those found on the color-coded face of the airspeed indicator, on placards in the cockpit, or in the Airplane Flight Manual or Owner’s Handbook are usually calibrated airspeeds.
		Indicated airspeed (IAS) is the direct instrument reading obtained from the airspeed indicator, uncorrected for variations in atmospheric density, installation error, or instrument error.
	avstop.com /AC/3-4.html (1146 words)

	low airspeed indicator
		The low airspeed indicator, located in the pilot instrument panel, measures and displays low airspeed up to 50 knots by horizontal (fore-aft) and vertical (lateral) direction indicators.
		The intersection of the two direction indicators is related to the circular scale to obtain resultant airspeed.
		Airspeed is sensed by the airspeed and direction sensor.
	incolor.inetnebr.com /iceman/pilot04.htm (89 words)

	Airspeed indicator for low-speed conveyances - Patent 4483191
		The inventor of this invention has made sufficient measurement on the airspeed and the output voltage of the generator, that is, the number of revolutions of the propeller 1, according to the airspeed indicator of this invention and carefully studied the characteristic of the airspeed indicator.
		An airspeed indicator for low-speed conveyances according to claim 1, wherein the second longitudinal axis of said hollow case is substantially perpendicular to the first longitudinal axis of said hollow hood.
		An indicating means for indicating the magnitude of the airspeed on a scale plate with a pointer is also provided, the pointer being rotated in proportion to the current through an ammeter coupled to the output of the generator.
	www.freepatentsonline.com /4483191.html (2610 words)

	Pitot-Static Instruments
		Calibrated airspeed (CAS) corrects the indicated airspeed for errors primarily resulting from the position of the static source and, to a much lesser degree, from pitot tube locations.
		Nonetheless, the vertical speed indicator is valuable in sensing deviations from a selected altitude or establishing a constant rate of climb or descent.
		Calibrated airspeed tables correct the whole range of indicated airspeed for these installation errors and can be found in the aircraft flight manual.
	www.allstar.fiu.edu /aero/PSI.htm (2571 words)

	172RG POH
		If a true airspeed indicator is installed, it is equipped with a rotatable ring which works in conjunction with the airspeed indicator dial in a manner similar to the operation of a flight computer.
		The pitot-static system supplies ram air pressure to the airspeed indicator and static pressure to the airspeed indicator, vertical speed indicator and altimeter.
		Having set the ring to correct for altitude and temperature, read the true airspeed shown on the rotatable ring by the indicator pointer.
	williams.best.vwh.net /172RG_POH/7-35.html (857 words)

	Airspeed Indicator
		The airspeed indicators for the Learjet 45 and Boeing 737-400 include an additional needle with red and white stripes called the "barber pole." A flight data computer takes information about the current altitude, air temperature, and pressure and continuously computes the maximum allowable airspeed as the aircraft climbs and descends.
		The airspeed indicator is the only instrument connected to both the pitot tube and the static system.
		The airspeed indicator is a differential pressure gauge.
	www.stantaleykis.com /airspeed_indicator.htm (193 words)

	airspeed indicator
		The single-scale indicator provides airspeed indication of 20 to 250 knots by measuring differences between impact air pressure from the pitot tube and atmospheric pressure from the static pressure ports.
		The pilot and gunner airspeed indicators, located on respective instrument panel, are standard pitot-static instruments.
		Maximum airspeed for TOW missile firing is 150 knots.
	incolor.inetnebr.com /iceman/pilot03.htm (211 words)

	EA 205 PRINCIPLES OF AERONAUTICS AND ASTRONAUTICS Airspeed Laboratory
		To determine the response of an airspeed indicator to various flow velocities and to compare the results to the theoretical values obtained from the momentum theory.
		Record the readability of the airspeed indicator, and the U-tube manometer.
		The equation for indicated airspeed as a function of dynamic pressure that is fitted to the experimental data is of the form:
	web.usna.navy.mil /~aeroweb/courses/ea205/AirspeedLab.html (341 words)

	Airspeed Indicator
		The basic airspeed indicator on a Cessna 152 or an F-15E both read Indicated Airspeed (IAS).
		The airspeed indicator discussed above measures the aircraft's speed through the air.
		As an aircraft climbs, the indicated airspeed will decrease as the air becomes thinner and the impact pressure is reduced.
	www.allstar.fiu.edu /aero/airspeed.htm (513 words)

	Hall Brothers Manufacturing Co. Hang Gliders, Paragliders & Ultralights
		The Hall Airspeed Indicator is an ideal airspeed indicator for hang gliders, paragliders, and ultralight aircraft.
		Typically, the Small Hall Airspeed Indicator is used for paragliding (7 to 30 mph or 11 to 50 km/h).
		Ultralights use either the 7 to 55 mph or the 7 to 80 mph Airspeed Indicators depending on their speed range.
	www.hallwindmeter.com /gliders.php (559 words)

	Airspeed Indicator
		At high level air becomes thinner, the Airspeed Indicator is a backup of the speed indicator of the HUD.
		The Airspeed Indicator shows speeds ranging between 80 and 800 kts.
		The data delivered by this instrument is an "Indicated Airspeed", as this speed varies according to the flight level.
	www.xflight.de /f16/pe_org_par_cec_airspeed.htm (98 words)

	Instrument Panel
		The airspeed indicator is one of the most important instruments in the aircraft.
		Other markings on the airspeed indicator are the colored arcs that mark various operational ranges of the aircraft's flight envelope.
		While indicated speed differs from true airspeed in non-standard temperature and atmospheric pressure conditions, it is usually within a few percent of the correct value.
	mywebpages.comcast.net /januth/flying/instrumentpanel.htm (1562 words)

	6-3
		When you approach the descending airspeed, the airspeed indicator becomes primary for pitch and the torque meter continues to be primary for power.
		As power is applied, the airspeed indicator is primary for pitch until the vertical speed approaches the desired rate.
		If the transition from level flight to a climb is smooth, the vertical-speed indicator will show an immediate upward trend and will stop at a rate appropriate to the stabilized airspeed and attitude.
	avstop.com /AC/Instument/6-3.html (1025 words)

	Instrument Flight
		The airspeed indicator is one of the oldest and most important of the flight instruments.
		For example, one manual's suggested procedure for leveling off from a climb is: note the altimeter; lower the nose on the attitude indicator; check for increasing airspeed on the airspeed indicator; check for constant heading on the heading indicator (the heading often swings to the right on level-off).
		The gyro-stabilized heading indicator is required because of the errors that occur in the magnetic compass during turns, speed changes and even in turbulent air.
	www.gruner.com /flight/appendix/instruments (896 words)

	Airspeed Calibration
		When the true airspeed is exactly the same at high altitude as at low, the high altitude indicated airspeed is lower.
		Indicated airspeed: the speed shown by the airspeed gauge.
		Calibrated indicated airspeed: the speed you would calculate by applying a correction factor to the indicated airspeed.
	home.flash.net /~dmprosvc/dave/airspeed.htm (1774 words)

	TGH Catalog: Airspeed
		The 8000 Series Airspeed Indicator is intended for use on an aircraft to indicate the speed relative to the air at sea level and at any other altitude, to indicate the equivalent speed corresponding to the actual force of the air.
		When properly connected to an airspeed tube, mounted so as to be in undisturbed air, the airspeed indicator measures the differential pressure developed between the pitot and static opening.
		The pressure is indicated in units of airspeed (mph and or knots).
	www.gyrohouse.com /catalog/subcat79.html (176 words)

	Mach airspeed indicator - Patent 4319333
		However, there are no prior art mach airspeed indicators known to applicant capable of internally computing VMO and/or mach number from measured altitude and airspeed for directly driving the VMO and/or mach displays, such as by closing a stepper servo motor servo loop for such a display by the internal computer.
		The present invention relates to airspeed indicator apparatus and particularly to mach airspeed indicators capable of displaying mach and VMO from measured altitude and airspeed data.
		In addition, by utilizing the mach air speed indicator of the present invention, the command air speed bug may be selectively driven by a performance data computer or other computer to indicate to the flight crew the optimum air speed as well as also being selectively manually settable on the instrument.
	www.freepatentsonline.com /4319333.html (8986 words)

	Swift Airspeed Indicator Information
		My airspeed indicator has speed readings up to 180 mph in 20 mph increments, so I guess it goes up to l90 at the top of the arc.
		Anyway the airspeed was bouncing around in 20 mph increments the whole time, especially over the trees when ready to land.
		Have had this happen before when extremely gusty and in rough air in other aircraft, but this is the first time with this one.
	www.napanet.net /~arbeau/swift/ias.htm (290 words)

	Airspeed
		In unaccelerated flight there is a direct relationship between airspeed and angle of attack so, in light aircraft, the airspeed indicator instrument acts as a de facto angle of attack indicator.
		Regulations for type certificated aircraft require that the complete airspeed indicating system of pitot head, static vent, connecting tubes and instrument be tuned so that the IAS reading is within 3% of the true reading over the normal airspeed range from Vs to Vc.
		Below is an airspeed correction table for a particular aircraft &; in balanced flight.
	www.auf.asn.au /groundschool/umodule2.html (9584 words)

	Flight Instructor Guide - Aeroplane
		Frequently cross check the attitude indicator with the airspeed indicator and vertical speed indicator to make sure that the aircraft is descending at the desired airspeed and rate of descent.
		At this time, the pilot should make frequent reference to the airspeed indicator until the desired airspeed is established, the power is correctly set, and the aircraft is re-trimmed.
		Refer often to the heading indicator, altimeter and airspeed indicator to confirm that the aircraft is flying straight and level at the desired airspeed;
	www.tc.gc.ca /civilaviation/general/flttrain/planes/Pubs/TP975/PartII/Ex24Full.htm (3960 words)

	Aviation 130 Handout: Lesson Two Outline
		Therefore the airspeed indicator measures the difference between ____________ __________ ____________ (H+) from the _________ __________ and ____________ ___________ from the ___________ _____________ by the expanding/contracting of an internal diaphragm and through a mechanical linkage ____________ (_____) is pointed out on the dial of the airspeed indicator.
		Airspeed indicator will indicate ________________ if using the alternate source.
		Both pitot tube and drain hole blocked, airspeed indicator acts as an _______________.
	www.aviation.uiuc.edu /UnitsPPD/ptCourseWork/AVI130/BillJonesWeb/less2.html (740 words)

	airspeed indicator
		It is simply the airspeed that is read directly off the airspeed indicator.
		Through this, the airspeed indicator will show a decrease in airspeed.
		If the aircraft maintains its present altitude and does not change velocity, no errors will occur in the airspeed indicator.
	www.aviationgroundschool.com /sample_pages/airspeed3.html (569 words)

	Wills Wing, Inc. - hall Information Page
		The design of the Hall type airspeed indicator involves using a ram air versus static pressure differential to raise a disc in a tapered tube against the force of the weight of the disc.
		An airspeed indicator will help you to fly at the appropriate speed for a given situation and when compared with variometer readings yields a wealth of information about the performance of your wing.
		The Hall Airspeed Indicator is a simple, reliable way to keep track of your airspeed while flying.
	www.willswing.com /prod2.asp?theClass=inst&theModel=hall (517 words)

	Airspeed Indicator on Me-262 - Topic
		I thought the second dial is for MAASI (maxium allowable airspeed indicator) or it could be the true airspeed indicator.
		I figured one is indicated airspeed and the other may be calculated true airspeed, or maybe its the calculated stall airspeed to serve as pilot warning, not sure.
		I thought also that it might be airspeed through engine nacelle so that you can see if there's turbine stall????
	forums.ubi.com /eve/ubb.x?a=tpc&s=400102&f=23110283&m=322100614 (356 words)

	Enerdyne home-garden weather Hall Brothers Windmeters Small Airspeed Indicator - 30 mph.
		A calibrated hand-held pitot tube type wind meter, the Hall Airspeed Indicator/Wind Meter was designed to fill the need for a simple, rugged, and reliable airspeed indicator, hand-held wind meter, and anemometer.
		Although of simple design, the Hall Airspeed Indicator/Wind Meter is very accurate.
		Since 1976, it has been the standard wind measuring and airspeed measuring instrument for hang gliders, paragliders and ultralight aircraft as well as many other uses such as wind surfing, kite flying, and radio controlled model airplanes.
	www.enerdynet.com /cgi-bin/product/search.cgi?db=product&uid=default&ww=on&id=SM30GP-D&view_records=1 (90 words)

	Fiorenze Airspeed Indicator
		As R/C model pilots, we can get lulled into relying on the model's speed relative to the ground, and, since we are not sitting in the cockpit viewing an airspeed indicator, this is really all we have to go on.
		Realtime, true airspeed, transmitted to a hand held receiver is now a reality and lends a measure of increased safety to our expensive jets.
		The more heavily loaded your jet is, the more critical airspeed management is, particularly in the landing pattern and especially if you are operating with a crosswind in your face.
	www.bvmjets.com /accessories/fio_asi.htm (528 words)

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In the News (Wed 25 Nov 09)