[Juha]

Jukka
yes I noticed but I don't think that 4-bladed+bubble canopy made much difference on roll-rate, which IIRC AFDU valued highly at that time and had not much effect on dive and had not significant effect on zoom climb even if probably effected somewhat on climb. So IMHO 4-bladed+bubble canopy would have not affect much AFDU's conclusions maybe they would have changed the adjective.