AEROGRAPHER'S MATE 3 & 2 



The wind speed indicator is a precision, high- 

 shock type voltmeter whose pointer indicates 

 wind speed in knots on a scale whose ranges 

 are to 60 knots or to 120 knots. The 

 scales are circular about an arc of approximately 

 270°. Selection of ranges is accomplished 

 by the use of the double- range switch to 

 change range from to 60 knots to to 

 120 knots. 



Indicator ID-586/UMQ-5 



The ID-586 indicator (fig. 3-2(E)) consists 

 of a speed indicator (voltmeter) and a direction 

 indicator (synchro) mounted on a panel which 

 is inserted in a case. A six-tapped dummy load 

 register is attached to the terminal board 

 mounted in the bottom of the case. No panel 

 lighting or dual-range circuits are installed 

 in this indicator. Each of the indicating as- 

 semblies (speed and direction) is removable 

 and may be installed individually. 



Indicators GMQ-29/UMQ-5 



The UMQ-5( ) is also used to feed data on 

 wind direction and wind speed into the new 

 digital readouts of the AN/GMQ-29( ), Auto- 

 matic Weather Station. This data is constantly 

 displayed on the readout panel through a very 

 complex system of electronic data reception 

 and computations. This computer system is 

 too detailed and complex for discussion in this 

 manual. For further information on its theory 

 of operation and application refer to NAVAIR 

 50-30GMQ-29-1. 



Recorder RD-108( )/UMQ-5 



The RD-108( ) recorder (fig. 3-2(D)) bas- 

 ically consists of a direction mechanism, speed 

 mechanism, chart drive mechanism, chart 

 guide-pen lift mechanisms, chart, and case. 

 A description of each is given in the following 

 paragraphs. 



WIND DIRECTION MECHANISM. — The wind 

 direction mechanism consists of a synchro 

 follower which positions the pen through a gear 

 train which converts 540 wind degrees of 

 synchro rotation to approximately 62° of pen 

 rotation, corresponding to 540 wind degrees of 

 the chart. Whevever wind conditions are such 

 that the pen would run off the chart in recording 

 wind direction, a repositioning mechanism is 

 energized. This mechanism removes power from 



the synchro, drives the pen to the approximate 

 center of the chart, and then returns power 

 to the synchro so that recording is continued 

 after the pen is displaced 360 wind degrees 

 toward the middle of the chart. 



The direction inking system consists of 

 the pen and a stationary ink tank. The pen is 

 designed to fit into a pen holder attached to 

 the synchro gear train and has a small tube 

 which fits into the ink tank and feeds ink 

 by capillary action to the penpoint which rests 

 on the chart. 



WIND SPEED MECHANISM. — The wind 

 speed mechanism consists of a voltmeter 

 mechanism which drives the wind speed pen 

 across the speed section of the chart. Also 

 included in the speed section is a six-tapped 

 dummy load resistor connected across a 

 terminal board. The pen and inking system of the 

 speed section is identical to that of the direction 

 section. 



CHART DRIVE MECHANISM. — The chart 

 drive mechanism is a removable, self-contained 

 assembly, consisting of a frame and various 

 mounted parts. The assembly contains the 

 chart drive motor, drive gear train, drive roll, 

 idler roll, chart trough, removable takeup reel, 

 takeup motor, and hinged panel. Also mounted 

 on the assembly are the speed change gears, 

 chart drive ON-OFF switch, takeup motor 

 mjcroswitch, and the plug through which power 

 is introduced to the mechanism. When the 

 mechanism is seated inside the recorder case 

 and the chart drive switch is in the ON position, 

 the chart drive motor moves the chart across 

 the drive roll and under the pens at a rate 

 determined by the change gears selected. The 

 chart is rerolled on the takeup reel by the 

 takeup motor. 



CHART GUIDE-PEN LIFT MECHANISM.— 

 The chart guide-pen lift mechanism is an as- 

 sembly which guides the chart across the drive 

 roll, holds the chart drive mechanism in place, 

 and provides a mounting for the illuminating 

 lamps and the direction and speed scales. The 

 assembly is pivoted so that it may be lifted 

 to gai'- access to the chart drive mechanism 

 and iru tanks, and to lift the pens off the 

 chart. 



CHART. — The strip-type chart is divided into 

 two main channels. The right channel is for the 

 recording of wind speed and is graduated every 



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