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2. Speed (Ground Speed) Calculation

Question: What is the speed (ground speed) of an airplane when it takes 1

hour and 20 minutes to fly a distance of 240 nautical miles?

Solution: Align the 24 on the outside scale with 1:20 (80) on the inside scale.

At this time, 18 is aligned with the SPEED INDEX (

▲

) on the inside

scale, and the answer is 180 Kt.

18

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17
18
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21
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Summary of Contents for B877

Page 1: ...Model No BJ5 BJ7 Cal B877 CTZ B8085 CTZ B8085 Cal B877 INSTRUCTION MANUAL 表 3 表 2 CTZ B8085 ENGLISH DEUTSCH FRANÇAIS ESPAÑOL ITALIANO PORTUGUÊS 中文繁体字 ...

Page 2: ...ATCH 8 Insufficient Charge Warning Function 10 Quick Start Function 10 Time Setting Warning Function 11 Overcharge Prevention Function 11 E CARE AND HANDLING DURING CHARGING 12 F REPLACING THE RECHARGEABLE CELL 13 G TIME REQUIRED FOR CHARGING 14 H Using the Slide Rule 16 l PRECAUTIONS 28 J SPECIFICATIONS 34 1 English ...

Page 3: ... used in this watch to store electrical energy This rechargeable cell is a clean energy battery which doesn t use any toxic substances such as mercury Once fully charged the watch will continue to run for about 6 months without further charging To use this watch comfortably make sure that the watch is always recharged before it stops There is no concern for overcharging this watch Overcharge Preve...

Page 4: ...endar after first loosening the screw Retighten the screw after the time and calendar have been set 3 Minute hand Date Date and Hour hand correction position Local time hours hand Time 24hour minute second correction position Crown Second hand Solar cell 24 hour hand Normal position ...

Page 5: ...gins to move when the crown is pushed in 4 Pull the crown out to the date correction position 1st click position 5 Turn the crown to the right clockwise direction and set the hour hand to the current time Pay attention to AM and PM since the location of the hour hand where the date changes is approximately 12 00 midnight 6 Securely return the crown to the normal position Reading the Time Based on ...

Page 6: ...rmal position Since the date is linked to movement of the hour hand the date changes when the hour hand approaches 12 00 midnight Please note this operation when using as a dual time watch Do not attempt to correct the calendar when the hour hand is between the hours of 9 00 PM and 1 00 AM Setting the calendar during this time may result in the date not changing on the following day ...

Page 7: ...t stopping the watch It can be used as a dual time watch by setting the 24 hour hand and hour hand to different times After correcting the time the hour hand is used to indicate the local time hours 6 Hour local time hour hand Minute hand Crown Normal position 24 hour hand Local time correction position ...

Page 8: ...ockwise direction Set the time while paying attention to AM and PM 3 Securely return the crown to the normal position The hour hand cannot be corrected in the counter clockwise direction The date changes when the crown is turned to the left counter clockwise In addition since the calendar is linked with the operation of the hour hand it may be necessary to correct the calendar after correcting the...

Page 9: ...d the display changes as below 8 D FUNCTIONS OF SOLAR POWERED WATCH If insufficiently charged If sufficiently charged and time is set Normal time display Insufficient charge warning display One second interval movement Two second interval movement If sufficiently charged ...

Page 10: ...fficiently charged and time is set If insufficient charge continues Hitch movement Stop The watch will begin to operate soon after it is exposed to light due to Quick Start Function Time setting warning display ...

Page 11: ... second interval movement begins the watch will stop After exposing the watch to light recharging takes place and the watch returns to one second interval movement Quick Start Function The watch will stop if it is completely discharged It will begin to operate soon after it is exposed to light However the time to start may vary according to the brightness of the light 10 Two second interval moveme...

Page 12: ... hitch to indicate that the time incorrect In this case quickly recharge the watch and reset the time Otherwise the hitch movement will continue Overcharge Prevention Function There is no risk of overcharging Once the rechargeable cell is fully recharged the overcharging prevention feature comes into operation and prevents overcharging 11 Hitch movement 2sec ...

Page 13: ... to run properly Notes On recharging Avoid recharging at high temperatures over about 60 C 140 F otherwise the watch will be damaged during recharging eg Charging the watch near a light source that easily becomes hot such as an incandescent lamp or a halogen lamp Charging in a place that easily becomes hot such as a dashboard When you charge the watch with an incandescent lamp halogen lamp or othe...

Page 14: ...r use another battery different from the rechargeable cell used in this watch The watch structure is so designed that a different kind of battery other than that specified cannot be used to operate it In case a different kind of battery such as a silver battery is used by some chance there is a danger that it will be overcharged to burst causing damage to the watch and even to the human body 13 ...

Page 15: ...0 10000 100000 Environment inside an ordinary office Time required 22 hours 11 hours 3 hours 30 minutes 1 hour 14 minutes One day usage 1 hour 30 minutes 45 minutes 15 minutes 5 minutes 2 minutes Empty to full 320 hours 158 hours 53 hours 17 hours 6 hours 60 70cm 24 28in under a fluorescent light 30W 20cm 8in under a fluorescent light 30W Exterior cloudy Exterior summer sunny From the stop state t...

Page 16: ...me when the watch is continuously exposed to radiation Full recharging time The time for fully recharge from stopped Empty to full One day usage The time required for the watch to run for one day with one second interval movement 15 ...

Page 17: ...the outside of the dial This slide rule is not able to display decimal places for calculation results and should only be used as a general reference as an alternative to more accurate calculations Turning the crown at the 8 00 position allows the slide rule around the dial Outside Scale to be rotated Inside scale Outside scale Crown for turning the outer scale ...

Page 18: ...take an airplane flying at 180 knots to fly a distance of 450 nautical miles Solution Set the 18 mark on the outside scale to the SPEED INDEX At this time the point on the inside scale that is aligned with 45 on the outside scale indicates 2 30 and the answer is 2 hours and 30 minutes ...

Page 19: ...speed of an airplane when it takes 1 hour and 20 minutes to fly a distance of 240 nautical miles Solution Align the 24 on the outside scale with 1 20 80 on the inside scale At this time 18 is aligned with the SPEED INDEX on the inside scale and the answer is 180 Kt 18 ...

Page 20: ...What is the flying distance traveled in 40 minutes at a speed of 210 knots Solution Align the 21 on the outside scale with the SPEED INDEX of the inside scale The 40 of the inside scale is now pointing to 14 and the answer is 140 nautical miles ...

Page 21: ...stion If 120 gallons of fuel are consumed in 30 minutes flying time what is the fuel consumption rate Solution Align the 12 of the outside scale with 30 of the inside scale The SPEED INDEX now points to 24 and the answer is 240 gallons per hour ...

Page 22: ...How much fuel is consumedin 6 hours at a fuel consumption rate of 250 gallons per hour Solution Align the 25 of the outside scale with the inside scale s SPEED INDEX of the inside scale The 6 00 is aligned with 15 and the answer is 1500 gallons ...

Page 23: ...s per hour and a fuel supply of 550 gallons what is the maximum number of flying hours Solution Align the 22 of the outside scale with the inside scale s SPEED INDEX of the inside scale The 55 of the outside scale is now aligned with 2 30 and the answer is 2 hours and 30 minutes ...

Page 24: ...l miles and kilometers Answer Align the 30 on the outside scale with the STAT mark on the inside scale At this time 26 nautical miles is aligned at the NAUT mark on the inside scale while the answer of 48 2 kilometers is aligned at the kilometers on the inside scale ...

Page 25: ...5 Solution Align 20 on the outside scale with 10 on the inside scale and read the outside scale at the 30 mark which is aligned with 15 of the inside scale Figure the number of decimal places and the answer is 300 Remember decimal places cannot be read on this scale ...

Page 26: ...ion 250 20 Solution Align 25 on the outside scale with 20 on the inside scale On the outside scale read the 12 5 mark that is aligned with 10 on the inside scale figure the number of decimal places and the answer is 12 5 ...

Page 27: ...ide scale with 20 on the inside scale At this time the answer of 40 can be read from the inside scale corresponding to 60 on the outside scale In addition the ratio of the value on the outside scale to the value on the inside scale is 30 20 at all positions on the scales ...

Page 28: ...uare root of 225 Solution Rotate the scales so that the value on the inside scale corresponding to 22 5 on the outside scale is equal to the value on the outside scale corresponding to 10 on the inside scale and read off the answer of 15 at that location ...

Page 29: ...n WATER RESIST or no indication Dial Case case back Specifications The unit bar is roughly equal to 1 atmosphere WR 50 or WATER RESIST 50 WR 100 200 or WATER RESIST 100 200 WATER RESIST ANT WATER RESIST ANT 5 bar or WATER RESIST ANT WATER RESIST ANT 10bar 20 bar or WATER RESIST ANT Water resistant to 3 atmospheres Water resistant to 5 atmospheres Water resistant to 10 20 atmospheres OK OK OK ...

Page 30: ...d on the dial and case and consult the table 29 WATER RESIST ANT xx bar may also be indicated as W R xx bar Examples of use OK OK NO Moderate exposure to water washing kitchen work swimming etc OK NO NO Marine sports skin diving NO NO NO Scuba diving with air tank NO NO NO Operation of the crown with moisture visible ...

Page 31: ...for skin diving however it is not designed for scuba or saturated diving using helium gas CAUTION Be sure to use the watch with the crown pressed in normal position If your watch has a screw type crown be sure to tighten the crown completely Do NOT operate the crown with wet fingers or when the watch is wet Water may enter the watch and compromise water resistance If the watch is used in seawater ...

Page 32: ... off Dust and dirt tend to be deposited in gaps in the back of the case or band Deposited dust and dirt may cause corrosion and soil your clothing Clean the watch occasionally Cleaning the Watch Use a soft cloth to wipe off dirt perspiration and water from the case and crystal Use a soft dry cloth to wipe off perspiration and dirt from the leather band To clean a metal plastic or rubber watchband ...

Page 33: ...love compartment or dash board of a car Doing so may result in deterioration of the watch such as deformation of plastic parts Do NOT place the watch close to a magnet Timekeeping will become inaccurate if you place the watch close to magnetic health equipment such as a magnetic necklace or a magnetic latch of a refrigerator door or handbag clasp or the earphone of a mobile phone If this has occur...

Page 34: ...re it may be exposed to chemicals or corrosive gases If solvents such as thinner and benzine or substances containing such solvents come in contact with the watch discoloration melting cracking etc may result If the watch comes in contact with mercury used in thermometers the case band or other parts may become discolored 33 ...

Page 35: ...ature range 10 C 14 F 60 C 140 F 7 Display features Time hour localtime hour minute second 24hour clock Calendar date 8 Additional features Insufficient charge warning Quick start Time setting warning Overcharge prevention 9 Continuous operating time Approx 6 months from full recharge to stop Approx 3 days from two second interval movement to stop 10 Battery Rechargeable cell Specifications are su...

Page 36: ...Model No BJ5 BJ7 Cal B877 CTZ B8085 CTZ B8085 Cal B877 INSTRUCTION MANUAL 表 3 表 2 CTZ B8085 ENGLISH DEUTSCH FRANÇAIS ESPAÑOL ITALIANO PORTUGUÊS 中文繁体字 ...

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