To obtain a
Wind Vector you need four components:
TAS
GS
HDG
TRK
In this case, we have:
GS = 490 kts
HDG (T) = 140衽 - VAR 20訖 = 120訊
TRK = HDG (120訊) + DRIFT (11訌) = 131訊
TAS = 465 kts (See below)
In AIRSPEED Window line up -50蚓 with Mach No Index.
Read Mach 0.80 on Inner Scale against TAS of 465 kts
on Outer Scale
On Wind Side:
Place Centre Dot over 465 kts
Place HDG (120訊) under True Heading Index
Using a SUPERFINE NON-PERMANENT MARKER PEN make a SMALL mark at the point where
the 11訌 DRIFT line crosses the GS 490 kts line
Rotate Wind Computer until small mark is on Wind Centre Line BELOW TAS
Read Wind Direction (020訊) under True Heading Index and count down from TAS to
small mark to obtain Wind Speed (095 kts).
W/V = 020/095