For the record Anthony Fokker looped his M.5 monoplane prior to the outbreak of WWI, and was decorated at the behest of Germany's chief-of-staff, Gen. Erich von Falkenhayn in June 1914 for his feat (duplicating Adolphe Pegoud's well-publicized stunt from a year earlier).

Looping the loop (repeatedly) became a popular barn-storming stunt during the 1920's. For example daredevil Adrienne Bolland (yes a woman), performed 98 loops during a 58 minute performance in 1923 (that's an average of one complete loop every 35 seconds)...........sounds pretty repetitive to me!

I'm not sure how often looping can be performed in WoW, and not sure if it matters, but successive looping is certainly within the realm of WWI aircraft performance......then again you guys are talking about an Eindecker, aren't you!