York
Interesting post. I was taught navigation with reference to those rules, albeit slightly different. We weren't taught anything with whizz wheels but using max drift and mental dead reckoning you can achieve same results.
You might find this slighly alternate way of doing the nav intersting.
Drift
Work out Max Drift.
Max drift = windspeed/airspeed (miles per min)
eg IAS 120kts or 2nm/min; Wind 20kts Max Drift =20/2
Max drift = 10 degrees.
Then use a clock face analogy to apply it. Imagine a clockface divided into quaters between 0 - 14 mins, 15 - 29mins etc.
However instead of the clock face representing minutes imagine it representing the wind direction in terms of degrees off track.
i.e If you are flying a track of 180 and wind is from 190 then the wind is 10 degrees off your nose, therefore in the first quadrant of the clock face i.e within 0 - 14 degrees.
The quadrants are used to apply a proportion of max drift to your heading as follows:
Wind less than 15 deg from your heading make no correction.
At 15 deg off apply 1/4 max drift to your heading (1/4 past)
At 30 deg off apply 1/2 max drift to your heading (1/2 past)
At 45 deg off apply 3/4 max drift to your heading.
Between 60 and 90 apply all max drift to your heading.
Always apply max drift towards the wind!
E.G. Flying 120kts, Required track 090, wind 130/16.
Max drift = [windspeed/airspeed (nm/min)] 16/2 = 8 degrees
Wind is 40deg off which is between 30 - 44 degrees therefore 1/2 max drift is required. 1/2 max drift is 4 degrees
Therefore will fly Hdg 094.
Hope you find this interesting. I'm not sure how PPL nav is taught so I hope this isn't teaching you to suck eggs!
SR
p.s it works for ground speed as well but you orient the clock face with the wing tip and apply the same proportions of the windspeed as opposed to max drift.