I am reluctant to give flight training techniques on the internet by actually describing how I personally do it because without one on one contact I have no idea who I am communicating with.
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However.
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With regard to teaching height judgement I have found the students will get the picture faster and more precise using the following method.
From one hundred feet I count down the height in this manner.
One hundred feet.
Fifty feet
Forty feet
Thirty feet
Twenty feet...flare now.
Fifteen feet
Ten feet
Five feet hold off
Four feet
Three feet
Two feet
One foot
Contact
I teach them where to look at each phase of the flight so they will be looking in the correct area during each phase......
.....At the far end of the runway is never one of the points....
Over the past sixty years of teaching I find that method really takes all the magic out of the equation and they " Get " the picture.
There you go gang, any questions?