Yeah, you guys may be right. I read somewhere that max vertec height is 12' and that is what i used for the calculations.
It was true in VC's case, as the official measurement was the same with my estimation, 36,5''
But i see there are many recorded max touches above 12' in the draft:
http://www.draftexpress.com/nba-pre-draft-measurements/?page=&year=All&source=All&sort2=DESC&draft=0&pos=0&sort=13So obviously there is a vertec higher than 12' , lol
Also, Derrick Jones is around 6'7'' now, so a 39'' jump would have his head at 118''. Cam angle is not so good causing distortion, but i think that 10'4'' head tip ( which would bring the vertec top to 12'6'' and this jump to 45'' ) is much more realistic.
But if we don't have a steady point ( e.g. the vertec top ) we are just guesstimating.