Nash, what is the turning point when you consider the battle was lost for Luftwaffe?
Some would say by the time they launched their first attack..but what do you say?
I don't think there was a "turning point", as such, although it's possible to those observing at the time that a particular day might have seemed like a turning point.
I think as the battle wore on, it increasingly tilted in favour of the RAF, which managed to build up it's strength whilst the Luftwaffe were losing theirs.
Certainly by the time the Luftwaffe switched attack to London, they were very understrength, whereas the RAF was still pretty much at front line strength.
As to the turning point being the day the Luftwaffe launched the battle, clearly the Luftwaffe lost, and clearly, with the same circumstances run again, they would still lose.
That wasn't clear at the time, of course. If the Luftwaffe had inflicted higher losses on the RAF, or managed to sustain less losses themselves, things could have been different, but with the balance of forces, and the performance of both sides, the Luftwaffe couldn't win.
To get a win for the Luftwaffe, you either have to change the balance of forces, or the performance of one side or the other.
Stephen Bungay in The Most Dangerous Enemy has a couple of tables showing first the best kill/loss days for the Luftwaffe:
19 July Raf losses 10, Luftwaffe losses 4
7 August Raf losses 4, Luftwaffe losses 3
11 September Raf losses 27, Luftwaffe losses 21
14 September Raf losses 11, Luftwaffe losses 8
28 September Raf losses 16, Luftwaffe losses 4
and second the days of heaviest fighting:
11 August RAF losses 17, Luftwaffe losses 20
12 August RAF losses 20, Luftwaffe losses 27
13 August RAF losses 13, Luftwaffe losses 47
15 August RAF losses 32, Luftwaffe losses 75
18 August RAF losses 34, Luftwaffe losses 69
30 August RAF losses 23, Luftwaffe losses 23
31 August RAF losses 37, Luftwaffe losses 33
7 September RAF losses 23, Luftwaffe losses 41
15 September RAF losses 28, Luftwaffe losses 56
27 September RAF losses 29, Luftwaffe losses 57
It's clear that on quiet days, the Luftwaffe could occasionally "win", but on the days of heavy fighting, the RAF almost always won.
You can't win a battle by a few individual combats, and I think the Luftwaffe, wth the emphasis on the "experten", was barking up the wrong tree.
War isn't a game of AH, where kill/death and "score" are what matters. It's about team performance.