E6-B Flight Computer

E6-B Flight ComputerE6-B has two main parts:

a slide rule side for making quick calculations. 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.

The Slide Rule SideThis side consists of a rotating disk and a fixed portion There are three set of scales outer scale (on the fixed portion) middle scale and inner scale (on the disk)The slide rule side also has windows that will use to solve altitude and airspeed problems.outer scalemiddle scaleinner scalewindows

The Slide Rule SideWhen set numbers on the middle scale against numbers onthe outer scale, allows you to solve problems of- time- speed- distance- fuel consumption- conversions between measurements

The inner scale on the rotating disk is graduated in hours.

The Slide Rule SideNumber 60 on the rotating disk is marked differently than the other numbers and called the rate arrow.

That is because most of the problems will be concernedwith timesomething per hour, either miles or gallons.rate arrow

How to read and interpret the numbers on the slide rule side.Rotate disk until all numbers on middle scale match up with numberson outer scale , put 10 on the top.

Number 10 may be read as .1, 1, 100, or 1,000 depending oncontext of the problem.

For now, read it as 10. The next number to the right is 11, so each mark between the two numbers is equal to .1, and you would read them as 10.1, 10.2, 10.3, etc.

How to read and interpret the numbers on the slide rule side.If you were solving a problem involving 1,000 pounds of fuel. The number 10 would be read as 1,000, and each markwould be equal to 10 pounds, and the 11 would be read as1,100 pounds.

How to read and interpret the numbers on the slide rule side.Between 15 and 16 each 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 mark past 15 (150 in this case) would be 152.

Time, Speed, and Distance ProblemsThe rate arrow on the disk is always set to indicate a valueper hour on the outer scale. There are three basic time-speed-distance problems. In two of these problems you know the rate, while in thethird problem, the rate is part of the answer.

Time, Speed, and Distance ProblemsFind the Time En Route : given g/s 150 knots, distance 245 nm.

1. Set the rate arrow at 150 on outer scale. 2. 245 nm. is halfway between 24 and 25 on the outer scale. (Speedand distance are always on the outer scale)

3. Look directly opposite to that value on the inner scale to find the Time En Route ; answer = 1:38

Time, Speed, and Distance ProblemsFind distances you can go : given g/s 125 kts, fuel endurance 4.5 hrs.

1. Set the rate arrow at 125 on outer scale. 2. Find 4:30 on inner scale.

3. Look opposite value on outer scale to find the distance ; answer = 564 nm. (not 56.4 or 5640.use commonsense)

Time, Speed, and Distance ProblemsIf you fly cover distance of 26 nm. within 13 min. ; Find airspeed.

1. Set 13 min. on middle scale opposite to 26 on outer scale. 2. Find ground speed from rate arrow ; answer = 120 kts.

Time, Speed, and Distance ProblemsPractice

SpeedTimeDistance

125 kts____524 nm

____2:30345 nm

110 kts1:40 ____4:12138 kts183 nm

Fuel Consumption Problems

Problems involving fuel endurance , fuel consumption, and fuel capacity are solved using the same numbers used inthe time-speed-distance problems. Only the names change.

fuel endurance=time fuel consumption = speed fuel capacity =distance

Fuel Consumption ProblemsPOH indicates fuel consumption of 8.4 gallons per hour at a given powersetting, usable fuel capacity is 64 gallons. How many hours endurancedo you have in the tanks ?

1. Set rate arrow at 8.4 on outer scale.

2. Find 64 on outer scale

3. Opposite of 64, read fuel endurance in hours:7:37 on the inner scale.

Note : outer scale which was used for speed and distance, is now used toindicate gal./hrs. and fuel capacity.

ConversionsYou can use E6-B to convert between values by settings of the middle scale. Nautical to Statute Miles

Problem : convert 90 knots to statute miles per hour:

1. Set the arrow marked NAUT opposite of 90 on the middle scale.

2. Read 103.5 under the STAT arrow.

ConversionsNautical or Statute Miles to Kilometers

Problem : convert 115 statute miles to kilometers:

1. Set 115 opposite of the STAT arrow.

2. Read 185 under the KM marking.

ConversionsU.S. Gallons to Imperial Gallons

Problem : convert 64 U.S. Gallons to Imperial Gallons :

1.Line up U.S. GAL arrow on middle scale opposite IMP. GAL arrow on outer scale.

2. Find 64 on the middle scale

3. Read 53.2 Imperial gallons on the outer scale

ConversionsQuantity/Weight ConversionsFuel U.S. Gallons to Fuel LBS.

Problem : convert fuel 32 U.S. Gallons to LBS :

1. Line up U.S. GAL arrow on middle scale with FUEL LBS arrow on outer scale.

2. Find 32 on the middle scale

3. Read 192 LBS on the outer scale

Quantity/Weight ConversionsOil U.S. Gallons to Oil LBS.

Problem : convert oil 2 U.S. Gallons to LBS :

1. Line up U.S. GAL arrow on middle scale with OIL LBS arrow on outer scale.

2. Read 15 pounds on the outer scale opposite of 2 gallons (20 mark) on the middle scale.

Quantity/Weight ConversionsUse the same method for converting Imperial Gallons of fuel / oil to LBS.

You can also convert - liters to U.S. gallons, - pounds to kilograms, - feet to meters

by aligning the appropriate arrows on the middle and outerscales.

Using the Altitude and SpeedCorrection WindowsFinding True airspeed (TAS) :

IASCAScorrect for pressure altitude andtemperature TAS

To get pressure altitude set altimeter to 29.92 and readthe altitude indicated;

On E6-B the outer scale is marked TAS (true airspeed) and the middle scale is marked CAS (calibrated airspeed).

Using the Altitude and SpeedCorrection WindowsFinding True airspeed (TAS) and Density alttitude :

Problem : CAS 143 kts, Pressure alt 15,000 ft, OAT -15C : Find TAS

Set pressure alt 15,000 ft. in the window (right) opposite OAT -15C

2. Without moving the computers scales, read the true airspeed on the outer scale opposite CAS 143 kts. on the middle scale.: answer 183 kts.

Using the Altitude and SpeedCorrection WindowsFinding True airspeed (TAS) and Density alttitude :

3. Read the density altitude over the arrow in the DENSITY ALTITUDE window. : answer 15,000 ft.Note : Density alt. is Pressure alt. corrected for variation from standard pressure.Standard Condition Pa = Da , Above standard Da > Pa , Below standard Da < PaStandard : Temp. decrease 2C per 1,000 ft.

Using the Altitude and SpeedCorrection WindowsFinding True Alttitude : (Unknown Station alt.)

Problem : Pressure alt. 8,000 ft, Indicate/Calibrated alt.7,600 ft , Temp -15C : Find True alt.

Set pressure alt 8,000 ft. in the window (left) opposite -15C

Read True airspeed on the outer scale opposite Indicate/Calibrated alt. 7,600 ft on the middle scale. : answer 7,600 ft .

Using the Altitude and SpeedCorrection WindowsFinding True Alttitude : (known Station alt.)

Problem : Pressure alt. 12,000 ft, Indicate/Calibrated alt.11,000 ft , Temp -30C, Station alt. 3,000 ft : Find True alt.

Set pressure alt 12,000 ft. in the window (left) opposite -30C

Subtract station altitude 3,000 ft. from indicated/calibrated altitude 11,000 ; get calibrated altitude of 8,000 ft. AGL.

3. Find calibrated altitude 8,000 ft. AGL on the middle scale and read the correction to station altitude on the outer scale = 7,350 ft.

4. Add the correction to station altitude 3,000 ft. to get true altitude MSL. Answer : 10,350 ft.

Off-Course Problems125 nm 235 nm8 nmAfter flying 125 miles, you note that you are 8 miles off course.

By using E6-B, you can determine :

Degree to fly parallel ()

Degree to intercept ()

Add these two = total degree correction (+)

Off-Course Problems125 nm 235 nm8 nmAfter flying 125 miles, note that flown 8 miles off course.

Find Degree to fly parallel ()

1. Set Miles traveled 125 nm. on middle scale to line up with Distance Off 8 nm. on outer scale.

2. Read 3.7 on rate arrow ; = 3.7

Find Degree to intercept ()

Set Miles to go 235 nm. on middle scale opposite Distance Off 8 nm. on outer scale.

2. Read 2.4 at the rate arrow ; = 2.4

Total correction (+) = 3.7 + 2.4 = 6.1

Off-Course Problems125 nm 235 nm8 nm

The Crosswind TableUsed to determine headwind, tailwind or crosswind component must know - angle between your course and reported wind direction. - reported wind velocity.

The Wind Side of the SlideInstructions

Determine ground speed and wind correction anglemust know:

true course : measured directly on chart

true airspeed : converted from indicated airspeed in flight or taken from POH during preflight planning.

true wind direction and velocity : winds aloft forecast

Determine ground speed and wind correction angleProblem : TC 090, TAS 125 kts., Wind 230/18 : Find G/S, WCA

1. Set Wind direction 230 at TRUE INDEX.

2. measure 18 units up from the grommet toward the TRUE INDEXand make a dot

3. Rotate transparent disk to bring TC 090 to TRUE INDEX.

4. Move the slide until wind dot falls on the arc for TAS 125 knots

5. Read ground speed of 138 knots under grommet (wind dot is below grommet indicates a tailwind)

6. The wind dot is 5 to the right, indicating that the true heading should be 095 : WCA = +5, TH = 095

WindWind TC TAS TH G/S Direc. Velocity

1. 240 38 300 165 ____ ____

2. 040 43 150 140 ____ ____

3. 330 25 020 180 ____ ____288143133149014163PRACTICE

Determining Winds in FlightProblem : TC 180, TH 160, G/S 120 kts., TAS 140 kts. : Find Wind

1. Set TC 180 at TRUE INDEX.

2. Move slide until grommet falls over line marked G/S 120 kts. TH is 20 less than TC, means 20 left WCA.

3. With grommet on 120kts. G/S line, find the point on slide where 20 left WCA crosses the line marked 140 and make a pencil mark.

4. Rotate disk until pencil mark is on centerline between grommet and true index.

5. Determine wind velocity by counting the lines between grommet and pencil mark.

6. Read wind direction under true index. Answer : wind 104/50

TH TC TAS G/S Wind Wind Direc. Velocity

1. 320 315 140 128 ____ ____

2. 175 160 150 115 ____ ____0021721249PRACTICE

ExercisePlan flight from VTBT - VTPH - Ko Lan VTBU VTBT

Used : 4,500 ft. for West bound / 5,500 ft. for East boundWind forecast 060/20Temp 25CTAS 93 kts. (with p/w setting 2,500 rpm.)Variation 2 WDeviation 0Fuel on board 22.5 GallonsConsumption 4.8 Gal./hrs.Fuel used for Start/Taxi/Take off = 1.2 Gallon

Produce : Aero Chart & Flight Log