Alan,

my notes it
says to work out the timings use 75% of the head / tail wind factor.


Hmm. Why not 100 percent? The way I would do it is to figure out the
percentage the head/tail wind is of my IAS (TAS, if you want to get
precise). Then, I would correct 1 minute by that percentage. From your
notes, your supposed to take 75 percent of that percentage.

In reality, this takes way too much brain power away from controlling
the aircraft. Make intelligent guesses. E.g. your holding speed is 90
knots, your wind component is an estimated 10 knots, so you try a 10
seconds correction.

--
Thomas Borchert (EDDH)