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Tex is incorrect or misquoted, a 1G barrel roll is next to impossible. More than 1G must generally be pulled at the entry point if you're even going to make th

Tex is incorrect or misquoted, a 1G barrel roll is next to impossible. More than 1G must generally be pulled at the entry point if you're even going to make the first loop. Even aerobatic champions in Su-26s struggle to do it, and those things have ridiculous power-to-weight. Furthermore, if you were watching a barrel roll you'd see the aeroplane's nose turn towards you as an observer. That'd didn't occur. What did Tex call it? The exact words out of his mouth: "So I came across and did a chandelle" https://www.youtube.com/watch?v=hASm6-2QLDU https://www.youtube.com/watch?v=hASm6-2QLDU Well, it certainly wasn't that as a chandelle is an FAA-certified check-manouevre involving a climbing turn. I know it's heresy to question 'national heroes' but frankly Tex didn't know what manouevre he did. All we know is he hacked something on the day, and it worked.

mannykannot 11y ago
> Furthermore, if you were watching a barrel roll you'd see the aeroplane's nose turn towards you as an observer. That'd didn't occur. Not if the entry trajectory is away from you, as is the case in all the videos I have seen - were you thinking of Tex's description of it as a chandelle here? He uses the unqualified term 'roll' elsewhere in the interview, and the maneuver certainly qualifies, as the craft performed a 360-degree rotation around the longitudinal axis and finished on close to the entry heading. Movement of the camera to follow the aircraft may have concealed its barrel shape, but if you follow the fuselage orientation, you can see changes in heading consistent with a barrel roll, though possibly around an oval or pear-shaped barrel. Regardless of what you call it, I don't think the maneuver as filmed could be performed at nearly 1G. I wonder if what Hoover was trying to convey was 1) he didn't go negative G, and 2) he didn't pull any more Gs than a chandelle, which, as you say, is a standard check-maneuver (I do not know if the latter is true (with respect to G forces), though the entry into, and exit from, a barrel roll have some resemblances to a chandelle.)
Roboprog 11y ago
Are you confusing a roll with a loop??? I fly RC, and pulling back hard on the elevator will rip the wings off a plane, particularly at the bottom of a loop. Alas, I know this from personal experience :-) Just rolling around the longitudinal axis with the ailerons is pretty low stress, though, at least in a "snap" roll. You loose some altitude, but the load on the wing at the end of the roll is pretty minimal. Making small elevator changes during the roll to pull back (generate positive G) during the sideways and inverted parts of the roll, and ease off (preventing more G than just gravity/lift of wing) as you return to an upright position is doable with practice. You will loose some altitude, it won't be a "straight" tube/barrel traced.

mannykannot 11y ago

> Furthermore, if you were watching a barrel roll you'd see the aeroplane's nose turn towards you as an observer. That'd didn't occur. Not if the entry trajectory is away from you, as is the case in all the videos I have seen - were you thinking of Tex's description of it as a chandelle here? He uses the unqualified term 'roll' elsewhere in the interview, and the maneuver certainly qualifies, as the craft performed a 360-degree rotation around the longitudinal axis and finished on close to the entry heading. Movement of the camera to follow the aircraft may have concealed its barrel shape, but if you follow the fuselage orientation, you can see changes in heading consistent with a barrel roll, though possibly around an oval or pear-shaped barrel. Regardless of what you call it, I don't think the maneuver as filmed could be performed at nearly 1G. I wonder if what Hoover was trying to convey was 1) he didn't go negative G, and 2) he didn't pull any more Gs than a chandelle, which, as you say, is a standard check-maneuver (I do not know if the latter is true (with respect to G forces), though the entry into, and exit from, a barrel roll have some resemblances to a chandelle.)

Roboprog 11y ago

Are you confusing a roll with a loop??? I fly RC, and pulling back hard on the elevator will rip the wings off a plane, particularly at the bottom of a loop. Alas, I know this from personal experience :-) Just rolling around the longitudinal axis with the ailerons is pretty low stress, though, at least in a "snap" roll. You loose some altitude, but the load on the wing at the end of the roll is pretty minimal. Making small elevator changes during the roll to pull back (generate positive G) during the sideways and inverted parts of the roll, and ease off (preventing more G than just gravity/lift of wing) as you return to an upright position is doable with practice. You will loose some altitude, it won't be a "straight" tube/barrel traced.