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#71
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barrel roll in 172
Big John schrieb:
I'm glad your the expert. I'm far from being an expert, but I have an idea, yes. I used to do half of a barrel roll at one G and give to student under If you can actually do a barrel roll without exceeding 1g at any point, then you should immediately inform your local university. Or, better yet, directly the nobel commitee. Because you've just proved that some very basic physical laws are wrong. Stefan |
#72
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barrel roll in 172
T o d d P a t t i s t schrieb:
Dudley's description of the classic competition BR, the There is no such thing as a competition barrel roll. it a BR, what do you call it? The question is: How far off the classic definition do you want to allow before you stop calling it a BR? Because the BR isn't a competition maneuvre, there is no exact definition. The best definition is the one you cited: Fly it as if the wheels rolled inside a barrel. But at which angle they do so, or how big the diameter of said barrel should be, is completely undefined. It's the same thing as with the wing over or the lazy eight. Stefan |
#73
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barrel roll in 172
"Stefan" wrote in message ... T o d d P a t t i s t schrieb: Dudley's description of the classic competition BR, the There is no such thing as a competition barrel roll. You are correct. Barrel rolls are not used in competition aerobatics. It's notable that aileron rolls are also not used in competitive aerobatics. Both of these maneuvers however are useful to demonstration pilots flying high performance airplanes with reasonable roll rates in specific situations where speed of execution rather than ground contact is desired. For example, demonstrating a fighter like a P51 or an F8F, it can be an advantage to use an aileron roll or a barrel roll during the run in to a maneuvering pass out of a horizontal turn around. However, once into the pass, all rolls should be slow rolls where the aircraft is "flown" all the way through the roll with reference to height of the longitudinal axis referenced to the ground. This is a great help in staying alive in this environment :-) Personally, for demonstration work, I always liked barrel rolls where it was safe to use them. In high performance airplanes they are very graceful and beautiful to watch from the ground and place very little strain on the airframe. Dudley Henriques |
#74
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barrel roll in 172
I've always used rudder and elevator to hold the nose on a
point when rolling, the roll being done with aileron and the nose held on the point with sometime uncoordinated use of the controls. I've never flown in competition. Never done slow or hesitation rolls. If I had my way, I'd do a hundred hammerheads for every roll. Which acro site, give a link and I'll check it out. -- James H. Macklin ATP,CFI,A&P "Morgans" wrote in message ... | | "Jim Macklin" wrote | | Visual aid... take a model airplane, hold it between your | finger tips on the nose and tail. Rotate it so it turns on | the fuselage. That's a plain roll or aileron roll. | | According to the acro site someone posted before, that is a slow roll. An | aileron roll requires establishing a slight up line, putting ailerons over, | but not trying to hold the line with the elevator or rudder, so that when | the rotation stops at wings level, you are on a slight down line. | -- | Jim in NC | |
#75
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barrel roll in 172
Jim Macklin wrote:
Then why a C172 with 4 seats. Fools always carry a witness. The most dangerous incidents in aviation are often proceded by "Watch this." |
#76
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barrel roll in 172
T o d d P a t t i s t wrote
A barrel roll is often described as: "imagine the wheels of the aircraft rolling on the inside of a barrel." In Dudley's description of the classic competition BR, the track of those wheels is going perpendicular to the axis of the barrel at the top, straight down the axis of the barrel at the beginning and end, and the barrel is perfectly round. In Dudley's expanded description of the BR (as any roll in 3D) the track might not be perpendicular at the top and the barrel might not be perfectly round. Todd, in your example, the wheels would "scuff" around the inside of the barrel. In order to roll around the inside of the barrel. The starting heading must be some number of degrees off the axis of the barrel, 45 degrees in the classic example. At the top of the barrel, the heading would have changed by 90 degrees, but would be 45 degrees off the axis of the barrel on the other side. Bob Moore |
#77
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barrel roll in 172
T o d d P a t t i s t schrieb:
There is no such thing as a competition barrel roll. The only aerobatics competition I've flown was in radio control airplanes in the 1970's. It was pretty informal, but we flew BR's and were judged on them. Of course you can do competitions any way you want and judge whatever you like. (And barrel rolls are beautiful to watch.) In this respect, I should have written "not an FAI competition figure". BTW, where I live and fly, this year's known programme for the beginners class in glider aerobatics contains a wing over. Not an FAI figure either. No problem, at the briefing, the chief judge will explain what he thinks a wing over should look like, and then it will be judged according to his guide lines. Stefan |
#78
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barrel roll in 172
Big John wrote:
Andrey As has been said in all the posts, the short answer is NO. 172 is not certified to do barrel rolls. However I can barrel roll a 172 only pulling 1 G which puts no more load on airframe than straight and level flight. I have thousands of hours to back up my statement. No you can not. It's not possible to even start the roll without going greater than 1G. |
#79
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barrel roll in 172
"Jim Macklin" wrote Visual aid... take a model airplane, hold it between your finger tips on the nose and tail. Rotate it so it turns on the fuselage. That's a plain roll or aileron roll. According to the acro site someone posted before, that is a slow roll. An aileron roll requires establishing a slight up line, putting ailerons over, but not trying to hold the line with the elevator or rudder, so that when the rotation stops at wings level, you are on a slight down line. -- Jim in NC |
#80
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barrel roll in 172
Matt Whiting wrote:
Your thousands of hours aside, this is simply an incorrect statement. A barrel roll requires flying a loop and you can't fly a loop at 1 G. It sounds like you are describing an aileron roll. You can't even do an aileron roll without exceeding 1G. Small g's sure, but you gotta go 1 to do just about anything. |
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