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E6-B Flight Computer Instructions This instruction booklet can be used with the three different E6-B models available from ASA. If you have a different model than the one depicted, some parts of your computer may appear slightly different from the computers pictured in this booklet. How- ever, the calculations are accomplished with the same method and produce the same answers. © 1992 – 2000 ASA Aviation Supplies & Academics, Inc. 7005 132nd Place SE Newcastle, WA 98059-3153 All rights reserved.
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Contents Page Instructions for Using ASA Flight Computer...... 4 The Slide Rule Side .......................................... 5 Time, Speed, and Distance Problems .............. 8 Fuel Consumption Problems ........................... 11 Conversions .................................................... 13 Nautical to Statute Miles ............................ 13 U.S. Gallons to Imperial Gallons ................ 15 Quantity/Weight Conversions..................... 16 Using the Altit
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Instructions for Using ASA Flight Computer Your ASA E6-B Flight Computer has two main parts: a circular slide rule side for making quick calculations, and a wind side for computing ground speed and wind correction angle. The slide portion of the circular slide rule side also includes quick- reference material. Figure 1 4
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The Slide Rule Side The term “circular slide rule” shouldn’t be intimidat- ing. This side of your computer simply consists of a rotating disk with numbers on the middle scale, which when set against similar numbers on the fixed portion (outer scale), allows you to solve problems of time, speed, and distance, calculate fuel consumption, and make conversions be- tween measurements such as statute and nauti- cal miles. The inner scale on the rotating disk is graduated in hours. The slide rule side
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Now look at the number 15 on the disk. Between 15 and 16 each calibration mark is equal to .2 and would be read as 15.2, 15.4, etc. If you were solving a problem with an airspeed of 150 knots, the first calibration past 15 (150 in this case) would be 152. The spacing changes again at the number 30, where each calibration becomes .5, and at 60, where each calibration equals 1. Before you read a value from the disks, be sure you understand what each line of calibration is equal to. You will use t
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Figure 2. Line up the number 60 (the rate arrow) with the number 12 on the outer disk (or, scale). 7
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Time, Speed, and Distance Problems The rate arrow on the disk is always set to indicate a value per hour on the outer scale. There are three basic time-speed-distance problems. In two of these problems you know the rate, while in the third prob- lem, the rate is part of the answer you are looking for. To find the Time En Route, let’s assume you know your airspeed is 150 knots (nautical miles per hour). 1. Set the rate arrow to 150. See Figure 3. 2. You have determined the distance to your destin
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Figure 3 Figure 4 9
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In the final and most common type of time-speed- distance problem, the time and distance are known, and you need to solve for unknown speed. The rate arrow represents the answer. You will have flown between two known ground reference points 26 NM apart and checked the time between them to be: 13 (thirteen minutes, that is, not thirteen hours). 1. Set thirteen minutes on the middle scale op- posite to 26 on the outer scale. See Figure 5. 2. The rate arrow points to your ground speed, 120 knots.
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Fuel Consumption Problems Problems involving fuel consumption, fuel endur- ance, and fuel capacity are solved using the same numbers you used in the time-speed-distance prob- lems. With the exception of time values, only the names change. Assume that your airplane’s Approved Flight Manual indicates fuel consumption of 8.4 gallons per hour at a given power setting and that the usable fuel capacity is 64 gallons. How many hours endur- ance do you have in the tanks? 1. Line up the rate arrow (“some
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When you paid for your fuel you noted on the delivery ticket that it took 32 gallons to top the tanks. You flew four hours and twenty minutes before stopping for fuel. What was the average fuel con- sumption? This time the rate arrow provides the answer. 1. Set 4:20 on the inner scale (or 260 on the middle scale) opposite of 32 on the outer scale. See Figure 7. 2. The rate arrow indicates the average fuel burn rate: 7.4 gallons per hour. Remember that fuel consumption is greater during the climb
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Conversions You can’t solve a problem unless the values agree. You can’t mix statute and nautical miles, gallons and liters, or Fahrenheit and Celsius. Your ASA E6-B Flight Computer makes it possible for you to convert between values with simple settings of the middle scale. Nautical to Statute Miles Distances on sectional and world aeronautical charts are in statute miles. Your airspeed indicator usually reads in knots, or nautical miles per hour. It is easy to convert between the two values by
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You can convert either nautical or statute miles to kilometers. Find the KM marking on the outer scale. Set the known value beneath the NAUT or STAT arrow as before, and read kilometers under the KM marking. For example, to convert 115 stat- ute miles to kilometers: 1. Set 115 opposite of the STAT arrow. 2. Read 185 under the KM marking. See Figure 9. Figure 9 Try these sample problems: (Answers are on Page 37) NAUT STAT KM 1. 20 2. 48 3. 110 14
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U.S. Gallons to Imperial Gallons Your Approved Flight Manual lists fuel capacity in U.S. gallons, but in many countries fuel is delivered in Imperial gallons. Arrows marked U.S. GAL and IMP. GAL are provided on both middle and outer scales to help you convert between these quanti- ties. Your tanks are placarded to hold 64 U.S. gallons. How many Imperial gallons will they hold? 1. Line up the U.S. GAL arrow on the middle scale opposite the IMP. GAL arrow on the outer scale. 2. Find 64 on the midd
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middle scale and read 38.5 U.S. gallons on the outer scale. Quantity/Weight Conversions Aviation gasoline weighs 6 pounds per U.S. gallon. For weight and balance calculations, aviation gaso- line weight-per-gallon can be determined by lining the U.S. GAL arrow on the middle scale with the FUEL LBS arrow on the outer scale. Fuel gallons are read on the middle scale and fuel weight on the outer scale. To find the weight of 32 U.S. gallons: 1. Align the arrows. 2. Read 192 pounds on the outer scale
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Figure 12 1. Align the arrows. 2. Read 15 pounds on the outer scale opposite of 2 gallons on the middle scale. See Figure 12. Imperial gallon weight of fuel and oil may also be determined in the same manner by lining up the IMP. GAL arrow on the middle scale with the FUEL LBS or OIL LBS arrow on the outer scale. You can convert liters to U.S. gallons, pounds to kilograms, or feet to meters by aligning the appropriate arrows on the middle and outer scales. For example, to convert pounds to kilogr
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Using the Altitude and Speed Correction Windows Altimeters and airspeed indicators are designed to give correct indications under standard conditions at sea level. The consistency of the earth’s atmo- sphere does not change linearly as you gain alti- tude; its density is affected by variations in tempera- ture and pressure. The E6-B provides windows on the slide rule side so you can allow for these variations when converting calibrated airspeed to true airspeed or indicated altitude to true alti
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Figure 13 3. Read the density altitude over the arrow in the DENSITY ALTITUDE window. See Fig- ure 13. Figure 13 shows a pressure altitude of 15,000 feet set opposite an outside air temperature of -15°C. A calibrated airspeed of 145 knots converts to a true airspeed of 183 knots and a density altitude of 15,000 feet under these conditions. Here are some sample problems: (Answers are on Page 37) PRESSURE DENSITY ALTITUDE TEMP CAS TAS ALTITUDE 1. 14,000 5°C 160 2. 20,000 -20°C 200 3. 8,000 15°C 1
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Converting Mach Number to True Airspeed To convert Mach Number to True Airspeed (or vice versa), rotate the inner dial until you see the Mach No. Index inside the airspeed correction window on the inner dial. Line up the true or outside air tem- perature (do not use Indicated Air Temperature) opposite this Mach No. Index. Mach Number on the inner scale reads opposite True Airspeed (in nautical miles per hour) on the outer scale. In Figure 14, at an outside air temperature of +15°C and Mach 1 (1
