Sep 2012Lesson 7.2

Power Pilot

Flight Computer

Reference

From the Ground UpChapter 7.5:Navigation ProblemsPages 197 - 207

Introduction• The E6-B flight computer is used for

many flight-related calculations and conversions.

• The flight computer will be used extensively during pilot training, and is very useful for flight planning and in-flight calculations.

Outline• Time, Distance, & Speed• Unit Conversions• Groundspeed & Heading

E6-B Flight Computer• The E6-B flight computer is used for many flight-

related calculations and conversions

Time, Distance, Speed• Set marker to speed

(example: 80 knots/mph/etc)

• Read distance on outer scale

• Read time on inner scale

Time, Distance, Speed• Set at 80 knots:

– Dist of 40 NM =– Time of 30 min

Time, Distance, Speed• Set at 80 knots:

– Dist of 160 NM =– Time of 120 min– Time of 2 hrs

(hour scale useful over 60 minutes)

Unit Conversions• Nautical miles

to/from statute miles:– Line up NAUT arrow

with STATUTE arrow– Read knots/NM on

outside– Read MPH/SM on

inside

• Example:– 61 NM =– 70 SM

Unit Conversions• Statute miles to/from

kilometers:– Line up STAT arrow

with KM arrow– Read MPH/SM on

outside– Read km/h/km inside

• Example:– 56 SM =– 90 km

Groundspeed & Heading• When determining your required heading (corrected

for wind) and resulting groundspeed for a cross-country flight, use the following procedure on the back of the flight computer:– Rotate circle so the wind direction is under “True Index”– Use a pencil to make small dot straight up from centre hole,

using vertical scale to measure airspeed (in knots)– Rotate circle so the true track is under “True Index”– Slide back-plate so that pencil dot is on horizontal line that

matches true air speed (TAS)– Read wind correction angle on vertical line under the pencil

dot (left of centre = -, right of centre = +)– Read groundspeed under centre hole

Groundspeed & Heading• Example Problem:

Track = 040º trueVariation = 12º eastDeviation = 4º westTAS = 115 knotsWind = 160º true at 25 knots

What is the resultant ground speed and compass heading to maintain track?

Groundspeed & Heading

1. Wind Direction:– Set 160º under

true index

2. Wind Speed:– Mark dot 25 knots

up from centre

25

Groundspeed & Heading

3. True Track:– Set 40º under true

index

4. True Air Speed:– Slide wind mark to

115 knots line 115

Groundspeed & Heading

5. Wind Correction:– Read wind

correction angleof +11º

6. Ground Speed:– Read resulting

ground speed of126 knots

11

Groundspeed & Heading7. True Heading:

– Add wind correction (+11º) to track (40º)– = 51º true heading

8. Compass Heading– Convert true heading to compass heading using variation

(12º E) and deviation (4º W): TVMDC– 51º + (-12º) + 4º = 43º

• Final Answer:– Groundspeed = 126 knots– Compass Heading = 043º