Your friend, Mr. E6B

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Your friend, Mr. E6B
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Resources

• Jeppesen Private Pilot Manual
• Chapter 8, Section C
• Pilots Handbook of Aeronautical Knowledge
• Chapter 14 pgs. 8 and 9
• ASA E6B Manual
• http//www.asa2fly.com/files/support/E6B_Manual.pd
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Objectives

• Learn the basic components of the Flight Computer
• Gain a basic understanding on how to do basic
  problems using the flight computer
• Practically apply your flight computer knowledge
  in flight planning to find your True Course,
  Winds, Groundspeed, Time, Distances and do basic
  calculations

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E6B components
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Circular Slide Rule Components

• Inner scale (C scale)
• Middle Scale (B Scale)
• Outer scale (A Scale)
• Rate mark
• Something per hour
• 10 mark
• Altitude and Temperature Windows
• Temperature Conversion

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Computer Side

• A and B Scale
• Identical
• Numbers get closer together as you go clockwise
• Logarithmic, so that you can do multiplication
  and division using the two scales
• Graduation also changes
• Scale is infinite
• 10 could be 1.0, 10, 100, 1,000.
• Pick out the reasonable choice when doing problems

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Computer Side (Contd)

• C Scale/Hours Scale
• Used to find time
• Speed index, big arrow at 60
• Total minutes on B scale, or read hours with
  minutes on C scale
• Speed Index will always point to rates on A scale
• Knots per hour, gallons per hour

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Computer Side (contd)

• 10 Index/Unit index
• Box around the 10 on B scale and C Scale
• Used for conventional multiplication and division
• Ex. 9 X 8 set the unit index on the inner scale
  under 90 on the A scale. The answer reads above
  the 80 on the B side 72!
• Ex. 100/50 Place 100 on the A Scale across from
  50 on the B scale and the answer reads on the A
  scale above the unit index of the B scale 2!

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Wind Side Components
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Ground Speed and Heading

• You are planning XC to Devils Lake. You will be
  cruising at 6000 feet with 75 best power. What
  will be your ground speed and true heading?
• 1.) Find your Winds
• GFK 9900 151904 1629-01
• Set wind direction under True Index
• Mark Wind Velocity up from grommet
• 2.) Find your True Course
• Use Plotter and Sectional 273 Degrees
• Set in under True Index
• 3.) Find your True Airspeed
• Use POH 110kts
• Move wind mark down to TRUE AIRSPEED
• 4.) Ground Speed reads under grommet, WCA reads
  under wind mark
• 5.) 260 degrees and 122 kts

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Time

• How much time will you need to make the flight?
• 1.) Set rate under ground speed (122kts)
• 2.) Find Distance on outer scale (70kts)
• 3.) Time (on inner scales) reads under distance
  (A scale).

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Fuel Calculations

• How much fuel will you need to make this flight
  in day VFR?
• 1.) Set rate to gallons per hour (from POH
  11.4)
• 2.) Add day VFR to time enroute
• 3.) Time reads on inner scale, gallons required
  reads above.

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Time and distance to climb

• You completely forget to calculate time and
  distance to climb on the ground with your POH.
  Your instructor wants you to do it now before
  takeoff. Use your E6B.
• 1.) How far do you have to climb?
• Cruise Altitude 6000 feet
• Airport Elevation 845
• 5155
• 2.) Use your E6B to divide the feet you need to
  climb by your rate of climb
• 5155/500 fpm 10.3 minutes for climb
• 3.) Put rate under groundspeed (122kts)
• 4.) Find 10.3 minutes on minute scale and read
  distance above.
• 21 NM

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U.S. to Imperial Gallons

• Upon arriving in Devils Lake, you find that the
  city has been over taken by Canadians. Youve
  only brought the minimum amount of fuel needed,
  and you need to fill up, but the Canadians only
  deal in Imperial Gallons. Your tanks are
  placarded at 100 U.S. Gallons. How many imperial
  gallons can they hold?
• Set the imperial gallons arrow opposite U.S.
  gallons
• Read imperial gallons opposite U.S. Gallons

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Computing Winds

• 1.) On your way back to Grand Forks, your GPS
  fails (?!), due to your excellent pilotage skills
  and planning, you still know your groundspeed and
  True course, which are 120 kts and 090
  respectively. You do, however, have an obsession
  with finding your winds. While your instructor
  flies, you pull out your E6B an decide to compute
  your winds..
• Set True Crouse under True index.
• Set grommet over groundspeed
• Make a mark over the wind correction angle across
  from the TAS
• Set WC mark above grommet.
• Wind velocity is the distance between grommet and
  mark, Wind direction reads under true index.

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Ground and Track

• While computing your winds, you have completely
  lost track of your ground speed and track. So,
  you simply use the winds you have just computed.
• Set wind direction under True Index and velocity
  above grommet
• Rotate your True heading, 090, under true index
• Place wind dot on True Airspeed
• Note wind drift in degrees
• Rotate azimuth equal degrees
• Adjust wind dot to True Airspeed
• Read track under index
• Read ground speed under grommet

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Mach Number

• You decide to make the flight more interesting
  and begin referring to yourself as Captain
  Yeager and giving your airspeed to ATC in Mach.
  What is your airspeed in Mach if you are cruising
  at 5500 and the temperature is -10 Celsius?
• Rotate inner dial until you see Mach Index in
  the airspeed correction dial
• Align Mach index with outside temperature (do not
  use IAS)
• True airspeed reads on outer scale, Mach number
  reads on inner scale

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Density Altitude and True Airspeed

• If your Pressure altitude is 8,000 feet, and the
  temperature is -10, what is your density
  altitude?
• Given a calibrated airspeed of 120, find your
  True Airspeed

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True Altitude

• 1. Set pressure altitude next to outside air
  temperature
• in the altitude correction window.
• 2. Subtract station altitude from
  indicated/calibrated
• altitude to determine calibrated altitude AGL.
• 3. Find calibrated altitude AGL on the middle
• scale and read the correction to station altitude
• on the outer scale.
• 4. Add the correction to station altitude to get
• true altitude MSL.

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True Altitude Computations