▁aer ob at ics , ▁this ▁man eu ver , ▁if ▁executed ▁pre - st all ▁with ▁a ▁non - zero ▁turning ▁radius ▁at ▁the ▁top ▁of ▁the ▁clim b , ▁is ▁known ▁as ▁a ▁wing over . ▁If ▁the ▁rud der ▁turn ▁is ▁executed ▁right ▁at ▁the ▁init iation ▁of ▁the ▁st all , ▁the ▁resulting ▁y aw ▁occurs ▁around ▁a ▁point ▁within ▁the ▁aircraft ' s ▁wings pan ▁and ▁the ▁man eu ver ▁is ▁known ▁as ▁a ▁st all ▁turn ▁or ▁ham mer head . ▁ ▁Aer ob atic ▁man eu ver ▁ ▁The ▁aer ob atic ▁Im mel mann ▁turn ▁der ives ▁its ▁name ▁from ▁the ▁dog f ight ing ▁t actic , ▁but ▁is ▁a ▁different ▁man eu ver ▁than ▁the ▁original , ▁now ▁known ▁as ▁a ▁" wing over " ▁or ▁" ham mer head ". ▁ ▁In ▁modern ▁aer ob at ics , ▁an ▁Im mel mann ▁turn ▁( also ▁known ▁as ▁a ▁roll - off - the - top , ▁or ▁simply ▁an ▁Im mel mann ) ▁is ▁an ▁aer ob atic ▁man eu ver . ▁Ess entially , ▁it ▁compr ises ▁an ▁asc ending ▁half - loop ▁followed ▁by ▁a ▁half - roll , ▁resulting ▁in ▁level ▁flight ▁in ▁the ▁exact ▁opposite ▁direction ▁at ▁a ▁higher ▁alt itude . ▁It ▁is ▁the ▁exact ▁opposite ▁of ▁a ▁Split ▁S , ▁which ▁involves ▁a ▁half - roll ▁followed ▁by ▁a ▁half - loop , ▁resulting ▁in ▁level ▁flight ▁in ▁the ▁exact ▁opposite ▁direction ▁at ▁a ▁lower ▁alt