I believe, that both a Lear 23-25
and a Boeing 757-200
with RR RB211 can do a good loop---can't test it with out a possible prison term though
edited to add ---B727---
BTW do you fellas ever read that stupid Youtube debating why do those Muppetts even talk????---also the one word every non-aviation person uses--although with ZERO---understanding is ''Stall"
I'll give a general reply---you see it works in 99.999% of cases---NO--that Not a stall!!!
THEY KNOW NOTHING!!!
Lester