Triangle of velocities and 1:60 rule

Question 1

3 vectors in triangle of velocities

Answer 1

• Heading/TAS
• Wind velocity
• Track/ground speed

Question 2

Calculating wind velocity - what are needed in the correct order applied

Answer 2

• TMG
• G/S
• HDG
• TAS
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Question 3

Calculating wind velocity steps

Answer 3

1. Place TMG under index
2. Put G/S under grommet
3. Apply difference between TMG and HDG to the TAS arc and mark spot
4. Move mark to vertical reference line above the grommet
5. Put grommet back to starting position

Wind speed will be the difference between grommet and mark and wind direction will be aligned under index

Question 4

When calculating wind velocity, what determines the side you draw the mark

Answer 4

• If HDG is less than TMG then its on the left

- If HDG is greater than TMG then its on the right

Question 5

1:60 heading correction = __ + __

Answer 5

TE + CA

Question 6

TE calculation

Answer 6

TE/60 = distance off track/distance flown

• outer scale TE and distance off
• inner scale 60 and distance flown

Question 7

CA calculation

Answer 7

CA/60 = distance off track/distance to go

• outer scale CA and distance off
• inner scale 60 and distance to go

Question 8

Calculating Track + G/S - what are needed in the correct order applied

Answer 8

• W/V
• HDG
• TAS
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Question 9

Calculating Tack + G/S steps

Answer 9

1. Align index with W/V direction and place grommet on start position
2. Draw dot over W/V speed on vertical reference line
3. align index with heading
4. Move dot drawn onto the TAS arc

G/S will be value under grommet
Track is calculated by adding/subtracting the WCA (which is the horizontal value on the TAS arc) to the heading

Question 10

When calculating Track and G/S what determines weather you add or subtract the WCA

Answer 10

• If mark is to the right of the grommet Subtract WCA from heading
• If mark is to the left of the grommet Add WCA to the heading

Question 11

WCA

Answer 11

Wind Correction Angle