Certainly I have tried this with the 109 and it is really difficult to maintain a pitch attitude of 90 degress and performing an Immelman which most know it was the trademark move of the 109. The controls even at full power become mush and the right rudder input does not do anything more than get you into a spin. Amazingly the G6 of the 109s is better suited for the Immelman than any of the other .It is much more difficult attempting an Immelamn in the 109 than in the P51 which surprising to say the least does it flawlessly ,and pivots quite fast.
From my experience the 109 if you don't manage well your velocity you cannot go vertical and do a loop, in fact after 150 the plane hangs from a thread in the air with 100% fuel ,25% might make it a tad stable but still stalls with ease(might be due to the fact that high AoA slats are not modeled or taken into account,other sims will model it I am sure).
Whatever is allowing ths endless looping might be due to flaws in the FM system of all of these sims or that it truly happened (now, I am taking a neutral approach) I will not share my opinion due to the inevitable flack that will eventually pertrude thru these board so I am sticking to my personal experience in the sim and my plane.
------------------
Glasses---I may have 4 eyes ,but you only have one wing.
Tis not important how one goes,but who goes with you.
