338:(PTO) system have tachometers showing the engine speed needed to rotate the PTO at the standardized speed required by most PTO-driven implements. In many countries, tractors are required to have a speedometer for use on a road. To save fitting a second dial, the vehicle's tachometer is often marked with a second scale in units of speed. This scale is only accurate in a certain gear, but since many tractors only have one gear that is practical for use on-road, this is sufficient. Tractors with multiple 'road gears' often have tachometers with more than one speed scale. Aircraft tachometers have a green arc showing the engine's designed cruising speed range.
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311:, overheating (exceeding capability of the cooling system), exceeding speed capability of sub-parts of the engine (for example spring retracted valves) thus causing excessive wear or permanent damage or failure of engines. On analogue tachometers, speeds above maximum safe operating speed are typically indicated by an area of the gauge marked in red, giving rise to the expression of "
442:, amplifier, and filtering circuits which produce a square wave pulse train output customized to the customers voltage and pulses per revolution requirements. These types of sensors typically provide 2 to 8 independent channels of output that can be sampled by other systems in the vehicle such as automatic train control systems and propulsion/braking controllers.
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when starting from standstill. Strictly, such devices are not tachometers since they do not provide a direct reading of the rotational speed of the disk. The speed has to be derived externally by counting the number of pulses in a time period. It is difficult to prove conclusively that the vehicle is
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They can be used to automatically calibrate wheel diameter by comparing the number of rotations of each axle against a master wheel that has been measured manually. Since all wheels travel the same distance, the diameter of each wheel is proportional to its number of rotations compared to the master
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Hall effect sensors typically use a rotating target attached to a wheel, gearbox or motor. This target may contain magnets, or it may be a toothed wheel. The teeth on the wheel vary the flux density of a magnet inside the sensor head. The probe is mounted with its head a precise distance from the
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of the society. This consisted of a bowl of mercury constructed in such a way that centrifugal force caused the level in a central tube to fall when it rotated and brought down the level in a narrower tube above filled with coloured spirit. The bowl was connected to the machinery to be measured by
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wheel. This calibration must be done while coasting at a fixed speed to eliminate the possibility of wheel slip/slide introducing errors into the calculation. Automatic calibration of this type is used to generate more accurate traction and braking signals, and to improve wheel slip detection.
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data. To get statistically significant results requires a high number of runs, and bias is introduced by the time of day, day of week, and the season. However, because of the expense, spacing (a lower density of loop detectors diminishes data accuracy), and relatively low reliability of loop
549:
Having perfectly regulated tape speed is important because the human ear is very sensitive to changes in pitch, particularly sudden ones, and without a self-regulating system to control the speed of tape across the head, the pitch could drift several percent. This effect is called a
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A weakness of systems that rely on wheel rotation for tachometry and odometry is that the train wheels and the rails are very smooth and the friction between them is low, leading to high error rates if the wheels slip or slide. To compensate for this, secondary odometry inputs employ
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stationary, other than by waiting a certain time to ensure that no further pulses occur. This is one reason why there is often a time delay between the train stopping, as perceived by a passenger, and the doors being released. Slotted-disk devices are typical sensors used in
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target wheel and detects the teeth or magnets passing its face. One problem with this system is that the necessary air gap between the target wheel and the sensor allows ferrous dust from the vehicle's underframe to build up on the probe or target, inhibiting its function.
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have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine revolutions and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.
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tachometer output. This is from a special connection called an "AC tap" which is a connection to one of the stator's coil output, before the rectifier. Tachometers driven by a rotating cable from a drive unit fitted to the engine (usually on the
307:, and typically have markings indicating a safe range of rotation speeds. This can assist the driver in selecting appropriate throttle and gear settings for the driving conditions. Prolonged use at high speeds may cause inadequate
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Tachometer signals can be used to synchronize several tape machines together, but only if in addition to the tach signal, a directional signal is transmitted, to tell slave machines in which direction the master is moving.
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Opto-isolator sensors are completely encased to prevent ingress from the outside environment. The only exposed parts are a sealed plug connector and a drive fork, which is attached to a slotted disk internally through a
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Tachometers are used to estimate traffic speed and volume (flow). A vehicle is equipped with the sensor and conducts "tach runs" which record the traffic data. These data are a substitute or complement to
526:
The tape recorder's drive electronics use signals from the tachometer to ensure that the tape is played at the proper speed. The signal is compared to a reference signal (either a
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Speed sensing devices, termed variously "wheel impulse generators" (WIG), pulse generators, speed probes, or tachometers are used extensively in rail vehicles. Common types include
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drives the speed of the tape transport. When the tach signal and the reference signal match, the tape transport is said to be "at speed." (To this day on film sets, the
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688:
Theoretische und praktische
Abhandlung über einen neuerfundenen Tachometer oder Geschwindigkeitsmesser : zunächst für Mechaniker, Fabrikanten, Baumeister und Andere
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calls "Roll sound!" and the sound man replies "Sound speed!" This is a vestige of the days when recording devices required several seconds to reach a regulated speed.)
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In vehicles such as tractors and trucks, the tachometer often has other markings, usually a green arc showing the speed range in which the engine produces maximum
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A tachometer on a tractor, reading up to 3000 RPM, with the hour meter below it showing 772.9 hours. The mark at 2500 RPM is the engine speed required to run the
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outputs and thus allow the vehicle's computer to determine the direction of rotation of the wheel. This is a legal requirement in
Switzerland to prevent
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As well as speed sensing, these probes are often used to calculate distance travelled by multiplying wheel rotations by wheel circumference.
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which prevents over-speeding the engine, so the tachometers in vehicles and machinery fitted with such engines sometimes lack a redline.
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as it passes across the head. On most audio tape recorders the tachometer (or simply "tach") is a relatively large spindle near the
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Tachometers or revolution counters on cars, aircraft, and other vehicles show the rate of rotation of the engine's
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276:; he used it for measuring the speed of machines in 1817. Since 1840, it has been used to measure the speed of
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On many recorders the tachometer spindle is connected by an axle to a rotating magnet that induces a changing
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Transactions of the
Society, Instituted at London, for the Encouragement of Arts, Manufactures, and Commerce
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detectors (often 30% or more are out of service at any given time), tach runs remain a common practice.
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315:" an engine — revving the engine up to the maximum safe limit. Most modern cars typically have a
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In older vehicles, the tachometer is driven by the RMS voltage waves from the low tension (LT
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45:"Revolution-counter" redirects here. For opposition to a fundamental change in power, see
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found on modern vehicles, the signal for the tachometer is usually generated from an
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which derives the information from either the crankshaft or camshaft speed sensor.
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205:(RPM) on a calibrated analogue dial, but digital displays are increasingly common.
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652:"An instrument to ascertain the velocities of machine, called a Tachometer"
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or disk, as in a motor or other machine. The device usually displays the
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The sensors mounted around the circumference of the disk provide
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sound playback, but not for recording in synchronization with a
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and seal. The slotted disk is typically sandwiched between two
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with traditional mechanical injector systems have an integral
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700:"Tachometer - Facts from the Encyclopedia - Yahoo! Education"
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The first mechanical tachometers were based on measuring the
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which electronically limits engine speed to prevent damage.
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Instrument measuring the rotation speed of a shaft or disk
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units beneath the train to measure speed independently.
493:, a tachometer is a device that measures the speed of
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tachometer (1,060 RPM) and engine hours (1736.7 hours)
573:. For such purposes, special recorders that record
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systems for rail vehicles, such as are required for
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272:. The inventor is assumed to be the German engineer
89:. Unsourced material may be challenged and removed.
235:"measure"). Essentially the words tachometer and
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284:In automobiles, trucks, tractors and aircraft
52:"Tach" redirects here. For other uses, see
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515:. Other systems connect the spindle to a
165:A tachometer that can indicate up to 7000
519:, which alternates light and dark upon a
149:Learn how and when to remove this message
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14:
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248:The first tachometer was described by
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702:. Education.yahoo.com. Archived from
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256:in 1810 for which he was awarded the
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87:adding citations to reliable sources
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1220:components, systems and terminology
34:, used for recording vehicle data,
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349:, while on others (and nearly all
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1125:Automobile auxiliary power outlet
400:In trains and light rail vehicles
193:) is an instrument measuring the
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780:Part of a series of articles on
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562:has a wow-and-flutter of 0.07%.
268:, similar to the operation of a
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565:Tachometers are acceptable for
74:needs additional citations for
1542:Propeller speed reduction unit
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538:). The comparison of the two
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837:Electronic instrument cluster
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464:European Train Control System
1352:Capacitor discharge ignition
797:Automotive navigation system
650:Donkin, Bryan (April 1810).
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923:Electronic throttle control
596:List of vehicle instruments
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485:In analogue audio recording
10:
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969:Automatic vehicle location
725:"HaslerRail Speed Sensors"
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414:slotted disk sensors and
38:, used for surveying, or
1408:Aircraft engine starting
491:analogue audio recording
460:train protection systems
30:Not to be confused with
1804:Automotive technologies
1453:Mean effective pressure
802:Automotive night vision
1493:Time between overhauls
625:Erjavec, Jack (2005).
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203:revolutions per minute
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1819:Measuring instruments
1768:Ice protection system
1508:Volumetric efficiency
1473:Overhead valve engine
984:Remote keyless system
627:Automotive Technology
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254:Royal Society of Arts
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54:Tach (disambiguation)
1799:Aircraft instruments
1753:Auxiliary power unit
1633:Flight data recorder
270:centrifugal governor
208:The word comes from
83:improve this article
1722:Pressure carburetor
1458:Naturally aspirated
1428:Engine displacement
532:alternating current
434:containing a photo-
416:Hall effect sensors
386:Traffic engineering
1737:Updraft carburetor
1611:Engine instruments
1537:Propeller governor
1433:Four-stroke engine
832:Check engine light
812:Blind spot monitor
591:List of auto parts
447:quadrature encoded
406:Wheel speed sensor
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317:revolution limiter
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252:in a paper to the
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47:Counter-revolution
42:, used on watches.
40:Tachymeter (watch)
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1043:Child safety lock
266:centrifugal force
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16:(Redirected from
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462:— notably the
432:circuit boards
404:Main article:
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379:power take-off
351:diesel engines
345:) side of the
336:power take-off
321:Diesel engines
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1317:
1315:
1312:
1310:
1307:
1305:
1302:
1300:
1297:
1295:
1292:
1290:
1287:
1285:
1282:
1280:
1277:
1275:
1272:
1270:
1269:Cylinder head
1267:
1265:
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1257:
1255:
1252:
1250:
1247:
1245:
1242:
1241:
1239:
1233:
1230:
1228:
1224:
1219:
1218:piston engine
1216:
1209:
1204:
1202:
1197:
1195:
1190:
1189:
1186:
1174:
1170:
1166:
1164:
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1142:
1136:
1133:
1131:
1128:
1126:
1123:
1121:
1118:
1117:
1115:
1111:
1105:
1102:
1100:
1097:
1095:
1094:Molded carpet
1092:
1090:
1087:
1085:
1082:
1080:
1077:
1075:
1072:
1071:
1069:
1065:
1059:
1056:
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1036:
1034:
1031:
1029:
1026:
1024:
1021:
1020:
1018:
1013:
1010:
1008:
1005:
1004:
1001:
995:
992:
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987:
985:
982:
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977:
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972:
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967:
965:
962:
961:
959:
955:
949:
946:
944:
941:
939:
938:Parking brake
936:
934:
931:
929:
926:
924:
921:
919:
916:
914:
911:
909:
906:
904:
901:
900:
898:
894:
888:
887:Trip computer
885:
883:
880:
878:
875:
873:
870:
868:
865:
863:
860:
858:
855:
853:
850:
848:
845:
843:
840:
838:
835:
833:
830:
828:
825:
823:
820:
818:
815:
813:
810:
808:
807:Backup camera
805:
803:
800:
798:
795:
794:
792:
788:
784:
783:
776:
767:
762:
760:
755:
753:
748:
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720:
706:on 2012-11-06
705:
701:
695:
689:
684:
669:
665:
661:
657:
653:
646:
638:
636:1-4018-4831-1
632:
628:
621:
617:
607:
604:
602:
599:
597:
594:
592:
589:
588:
582:
578:
576:
572:
568:
567:high-fidelity
563:
561:
560:cassette deck
557:
553:
547:
545:
541:
537:
533:
529:
524:
522:
518:
514:
511:
507:
502:
500:
496:
492:
482:
480:
479:Doppler radar
474:
470:
467:
465:
461:
457:
452:
448:
443:
441:
437:
433:
429:
423:
419:
417:
413:
412:opto-isolator
407:
397:
394:
393:loop detector
380:
375:
371:
369:
365:
361:
356:
352:
348:
347:ignition coil
344:
339:
337:
333:
328:
326:
322:
318:
314:
310:
306:
298:
294:
290:
281:
279:
275:
271:
267:
262:
259:
255:
251:
241:
238:
233:
223:"speed") and
221:
211:
206:
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200:
196:
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188:
184:
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176:
168:
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153:
150:
142:
131:
128:
124:
121:
117:
114:
110:
107:
103:
100: –
99:
95:
94:Find sources:
88:
84:
78:
77:
72:This article
70:
66:
61:
60:
55:
48:
41:
37:
33:
19:
1773:Recoil start
1732:Turbocharger
1727:Supercharger
1647:
1593:Single-blade
1503:Valve timing
1324:Sleeve valve
1309:Poppet valve
1284:Main bearing
903:Bowden cable
871:
779:
772:Car interior
729:. Retrieved
719:
708:. Retrieved
704:the original
694:
683:
671:. Retrieved
659:
655:
645:
626:
620:
579:
571:movie camera
564:
548:
525:
503:
488:
475:
471:
468:
450:
444:
424:
420:
409:
389:
340:
329:
302:
263:
250:Bryan Donkin
247:
207:
190:
186:
182:
178:
174:
172:
145:
139:October 2010
136:
126:
119:
112:
105:
98:"Tachometer"
93:
81:Please help
76:verification
73:
1717:Intercooler
1643:Hobbs meter
1568:Blade pitch
1563:Autofeather
1556:Terminology
1463:Monosoupape
1423:Dead centre
1396:Terminology
1304:Piston ring
1274:Gudgeon pin
1113:Convenience
1104:Vehicle mat
1053:Rumble seat
1038:Bucket seat
994:VIN etching
974:Immobiliser
867:Speedometer
817:Boost gauge
790:Instruments
662:: 185–191.
540:frequencies
517:stroboscope
510:Hall effect
381:at 540 RPM.
309:lubrication
278:locomotives
237:speedometer
187:rev-counter
36:Tacheometer
1788:Categories
1707:Gascolator
1697:Carburetor
1648:Tachometer
1530:Components
1522:Propellers
1438:Horsepower
1403:Air-cooled
1382:Spark plug
1347:Alternator
1340:components
1338:Electrical
1319:Rocker arm
1259:Crankshaft
1237:components
1235:Mechanical
1130:Cup holder
1074:Boot liner
1033:Bench seat
957:Anti-theft
928:Gear stick
877:Telematics
872:Tachometer
842:Fuel gauge
731:2011-06-02
710:2012-06-05
612:References
606:Tachograph
521:photodiode
513:transistor
440:transistor
355:alternator
305:crankshaft
293:Cessna 172
258:Gold medal
175:tachometer
109:newspapers
32:Tachograph
18:Tachometry
1367:Generator
1135:Car phone
1099:Sun visor
1084:Dashboard
1058:Seat belt
989:Smart key
882:Tell-tale
673:23 August
575:pilottone
534:from the
495:audiotape
313:redlining
261:pulleys.
191:RPM gauge
1794:Avionics
1671:Throttle
1588:Scimitar
1294:Oil pump
1264:Cylinder
1254:Crankpin
1244:Camshaft
1215:Aircraft
1153:Category
896:Controls
852:Odometer
827:Carputer
668:41325817
585:See also
544:director
456:odometer
451:rollback
438:, photo-
360:camshaft
325:governor
1547:Spinner
1387:Starter
1377:Magneto
1314:Pushrod
1163:Commons
1028:Armrest
1012:Seating
601:Redline
556:flutter
508:upon a
428:bearing
244:History
123:scholar
1685:system
1488:Stroke
1329:Tappet
1299:Piston
1173:Portal
1023:Airbag
1007:Safety
913:Clutch
822:Buzzer
666:
633:
332:torque
232:métron
226:μέτρον
220:táchos
169:(left)
125:
118:
111:
104:
96:
1692:Avgas
1628:EICAS
1120:Audio
964:Alarm
908:Brake
664:JSTOR
554:-and-
536:mains
436:diode
297:G1000
214:τάχος
210:Greek
199:shaft
197:of a
130:JSTOR
116:books
1681:Fuel
1623:EFIS
1413:Bore
782:cars
675:2021
631:ISBN
183:tach
102:news
552:wow
530:or
489:In
368:ECU
364:EMS
295:'s
167:RPM
85:by
1790::
660:28
658:.
654:.
629:.
523:.
466:.
418:.
280:.
189:,
185:,
181:,
173:A
1207:e
1200:t
1193:v
765:e
758:t
751:v
734:.
713:.
677:.
639:.
229:(
217:(
177:(
152:)
146:(
141:)
137:(
127:·
120:·
113:·
106:·
79:.
56:.
49:.
20:)
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