FIAT G.91 Flight Manual and 'Edge-Knife' Maneuver Possibility

[flateric]

In short, if you have in possession G.91 or G.91 mods flight manual and/or can tell me if this a/c could or could not perform 'edge-knife' maneuver w/out problems with fuel tanks drainage, I'd be very obliged.

Good ol' 15-20 sec straight and level edge-knife and not "cross-over in a step turn" as described at #10 here when fuel in tanks squeezed to drain holes by gravity when going out of turn.

http://www.freccetricoloriclub40.it/brochure/brochure1981.pdf


and seemingly seen here

Need: ASAP

 

[Jemiba]

The same question was asked in the German Flugzeugforum and as an answer, this video was posted :
http://www.youtube.com/watch?v=u9qmnbS1bJ4
But it seems just to be edge-knife flying for no more, than 10 s (at around 50s in the video).
Someone, who actually flew the "Gina" posted from the manual: "It is not advisable to prolong
inverted flight for more than 20 sec, since fuel proportioner would run dry and could be damaged."