Work out MAX drift ( windspeed divided by IAS x 60). take the wind direction and heading - look at the angular difference and apply it to a clock face. the amount round the clock is the amount of max drift.
i.e. 100kt a/c with 20 kt wind - max drift = 12 degrees, wind angle 45 degrees (3/4 round the clock) drift = 8 degrees (3/4 of 12). You can also use this for crosswind component - in this case, 20kts of wind so crosswind component = 15 kts.
For head/tailwind component take the wind angle away from 90 then apply to the clock face, so with a wind at 50 degrees off the nose or tail, subtract from 90 = 40 degrees = 2/3 round the clock = 14kts (round up or down to make things easy, so use 21 kts instead of 20 making it easy to find 2/3).
