Tex Johnson
I couldn't remember Tex Johnson's name so thanks for the help Ranger 1 ... but note from the link, GP, that Tex apparently did roll it twice .. so you could just be correct..
I think the complete video - together with the comment about not doing it again on demo flights to prospective customers - was shown on a BBC series called "Reaching for the Skies" about 10 years ago. I certainly remember one sequence in the programme was of an Aero Commander being barrel rolled, while two USAF Generals in the back poured a cup of tea as the horizon slowly spun round, demonstating that there was positive G all the way round.
Sorry about the total thread hijack.
DGG