Quote:
Originally Posted by ACE-OF-ACES
As noted, hard to read the graph, but assuming 'speed' is on the bottom (x axis) and that it goes as follows
520 - 530 - 540 - 550 - 560
Now looking at the point where the two curves intersect (y=0) the bottom (x axis) we have
1st @ ~523.5kph
2nd @ ~528.5kph
5 = 528.5 - 523.5
That is what I got, but again, I could be reading it wrong too.. That graph is hard to read
But..
Lets not use that graph.. Lets use the 109E data your claim was based on! That would be the correct thing to do! Now that I got your att on the subject! 
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the whole document is twisted 90° left.
so the speed is actually on the y axis.but there is also the temperature on the y axis as well in the lower half...
and the rads settings are on the x axis in mm.
so the doc you provided states a difference of more than 50kph between open and closed rads.