“CR-3 or E6-B Flight Computer” 52 RCACS Ground School Navigation PO 404 EO 4 “CR-3 or E6-B Flight Computer”

Introduction Teaching Points Review Reference: The Appleyard Scale Conversions Wind Side of the EB-6 Computer Review Reference: FTGU Chapter 7 Section E Pages 197-205 CR-3 or E6-B Handbook

Introduction What: Why: Where: In this lesson we will learn how to use the FLIGHT COMPUTER CR-3 or E6-B. We will learn basic exercises on the Appleyard Scale as well as how to use the Wind Side of the computer. Why: The above information is required to plan and fly cross-countries. Where: You will require this knowledge at every stage in your flying career.

The Appleyard Scale The outside ring is distance and velocity The inside ring is time.   All calculations can be done without using the flight computer by using the following formula: V = D/T Where V = velocity D = distance T = time

The Appleyard Scale Time scale The number 9 stands for 9 min, 90 min, 900 min, etc. You must use common sense to figure out which one applies. Notice on the time scale under the 9, 1:30 and 15:00h are also written. They stand for 90 min and 900 min respectively.

The Appleyard Scale Distance Scale Same as time scale in that the number 6 stands for 6, 60, 600, 6000 etc. Once again common sense applies. If you have two of the three components, it is possible to find the last one. The “One-in-Sixty” Rule An error in the track of one degree will cause an error in position of about one mile in a distance of 60 miles.

Exercise #1 EXERCISE # 1: Find the missing element. 1) Speed = 120 mph Distance = 90 SM Time =   2) Speed = 50 Kts Distance = Time = 10 min 3) Speed = Distance = 60 SM Time = 50 min

Conversions Many conversions are possible with the flight computer. Some of the conversions are: a) MPH To KPH b) KPH To MPH c) US GAL To IMP GAL d) LBS. To Kg

Exercise #2 20 NM= ­­­­­­­_______ SM = KM 50 SM = NM= KM

Wind Side of the E6-B Flight Computer: Steps to use the E6-B Flight Computer: i. Set wind direction opposite true index Ii. Place grommet over 100 iii. Mark wind dot up from grommet iv. Place true Course under true index v. Slide true airspeed under wind dot vi. Read ground speed under grommet vii. Read WCA under wind dot viii. Complete problem by using formula

Examples eg.1 Answers: eg.2 TAS = 100kts W/V = 120deg @ 20kts TT = 150deg Answers: Ground speed 82 WCA -6 TH 144  eg.2 TAS = 60kts W/V = 280deg @ 15kts TT = 340deg ground speed 51 WCA -13 TH 327

EXERCISE # 3 Given: true airspeed (TAS) true wind vector (W/V) true track Find ground speed (G/S) true heading.  1.TAS = 70 Kts W/V = 150deg / 20kts TT = 200deg 2.TAS = 160 Kts W/V = 340deg/ 15kts TT = 090deg 3.TAS = 80 Kts W/V = 270deg/ 13kts TT = 165deg 4.TAS = 100 Kts W/V = 120deg/ 20kts TT = 150deg 5.TAS = 60 Kts W/V = 280deg/ 15kts TT = 340deg

Questions? ?