Could you do this in a 747-400?
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Aerocat,
Damn terminology. I'd call this a really flat barrel roll if there was no negative G through it. But I see your point.
The way I used to do aileron rolls, you'd pitch up a good 30 degrees or so
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Quote:
Originally Posted by flog
You can do a barrell roll at 1G
No, you can't.
Originally Posted by flog
You can do a barrell roll at 1G
No, you can't.
Some people need to have a good read up on torsional loading and what it does to an aircraft before saying things like:
but well within airframe limits for almost anything
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Some people need to have a good read up on torsional loading and what it does to an aircraft before saying things like:
Edit - Why does this make me angry?
flog
And some people here use to be aerobatic instructors. First of all a barrel roll “IS NOT” a 1g maneuver. During any properly executed barrel roll or loop for that matter, the aircraft will experience up to 3g. The Airbus A340’s and A330’s I fly now are limited to +2.5g & -1.0g in the clean configuration and if I remember correctly most non-aerobatic light aircraft are the same. Now if you or some others here want to venture into the world of being a test pilot without being qualified, go right ahead. And before you tell me about Tex and the Dash 80 or the French pilot with the Concorde, they were both test pilots.
And some people here use to be aerobatic instructors. First of all a barrel roll “IS NOT” a 1g maneuver. During any properly executed barrel roll or loop for that matter, the aircraft will experience up to 3g. The Airbus A340’s and A330’s I fly now are limited to +2.5g & -1.0g in the clean configuration and if I remember correctly most non-aerobatic light aircraft are the same. Now if you or some others here want to venture into the world of being a test pilot without being qualified, go right ahead. And before you tell me about Tex and the Dash 80 or the French pilot with the Concorde, they were both test pilots.
Aerobatic Figures
by Dr. Guenther Eichhorn
The Barrel roll is a combination between a loop and a roll. You complete one loop while completing one roll at the same time. The flight path during a barrel roll has the shape of a horizontal cork screw. Imagine a big barrel, with the airplanes wheels rolling along the inside of the barrel in a cork screw path. During a barrel roll, the pilot always experiences positive Gs. The maximum during the maneuver is about 2.5 to 3 G. The minimum about 0.5 G.
by Dr. Guenther Eichhorn
Barrel Rolls
The Barrel roll is a combination between a loop and a roll. You complete one loop while completing one roll at the same time. The flight path during a barrel roll has the shape of a horizontal cork screw. Imagine a big barrel, with the airplanes wheels rolling along the inside of the barrel in a cork screw path. During a barrel roll, the pilot always experiences positive Gs. The maximum during the maneuver is about 2.5 to 3 G. The minimum about 0.5 G.
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So you've got your 747 (or C172 for that matter) up and into the barrel roll and it falls out from the top......... 2 thoughts probably pop into your head.
"i wonder how strong this thing really is'' (you're about to find out)
and
''i wish i was in an aero's plane right now''
DON'T try aeros maneuvers in non aeros a/c!!!!!
"i wonder how strong this thing really is'' (you're about to find out)
and
''i wish i was in an aero's plane right now''
DON'T try aeros maneuvers in non aeros a/c!!!!!
So you've got your 747 (or C172 for that matter) up and into the barrel roll and it falls out from the top......... 2 thoughts probably pop into your head.
"i wonder how strong this thing really is'' (you're about to find out)
"i wonder how strong this thing really is'' (you're about to find out)
3G's would be no big deal for a 747.
18-Wheeler
The 747SP owned by China Airlines that discovered Vmca after an engine shutdown in cruise never flew again. Structural damage to the wing caused by the high g’s and flight well beyond Mmo (just past Mach 1 infact) bent the main wing spar and caused deformation to the upper wing skins. So yes while it held together and proves Boeing builds a great aircraft, it also clearly demonstrates the dangers in flying an aircraft beyond its certified limitations.
The 747SP owned by China Airlines that discovered Vmca after an engine shutdown in cruise never flew again. Structural damage to the wing caused by the high g’s and flight well beyond Mmo (just past Mach 1 infact) bent the main wing spar and caused deformation to the upper wing skins. So yes while it held together and proves Boeing builds a great aircraft, it also clearly demonstrates the dangers in flying an aircraft beyond its certified limitations.
The 747SP owned by China Airlines that discovered Vmca after an engine shutdown in cruise never flew again.
From an earlier reply..
Suggest you check your facts.
http://aviation-safety.net/database/...?id=19850219-0
Here is the aircraft as it is today.
http://www.airliners.net/open.file/0883168/L/
http://aviation-safety.net/database/...?id=19850219-0
Here is the aircraft as it is today.
http://www.airliners.net/open.file/0883168/L/
Last edited by Peter Fanelli; 1st Nov 2007 at 18:33.
Peter Fanelli
I stand corrected. I suspect I have lost a few too many cells from the grey matter with the passage of time. Still the damage was substantial and clearly demonstrates the dangers when an aircraft is operated outside of its limitations.
DON’T DO AEROBATICS IN A NON AEROBATIC AIRCRAFT
I stand corrected. I suspect I have lost a few too many cells from the grey matter with the passage of time. Still the damage was substantial and clearly demonstrates the dangers when an aircraft is operated outside of its limitations.
DON’T DO AEROBATICS IN A NON AEROBATIC AIRCRAFT
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Quote:
Quote:
Originally Posted by flog
You can do a barrell roll at 1G
No, you can't.
Ok, maybe not 1G, but well within airframe limits for almost anything (the Wright Flyer might have issues).
Quote:
Originally Posted by flog
You can do a barrell roll at 1G
No, you can't.
Ok, maybe not 1G, but well within airframe limits for almost anything (the Wright Flyer might have issues).
To change direction and maintain 1'G' is a physical impossibility.
Unfortunately, many pilots these days do not have a solid grounding in Physics as well as Mathematics. If they did, the afore-mentioned statement would be self-evident.
Many people seem to confuse performing a relatively low 'G' but constantly positive 'G' maneouvre with a fictional 1'G' maneuouvre.
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I am performing a 1 g manoeuvre right now. By sitting here.
Pouring a coffee during a barrel role is feasible.
Pouring a coffee during an aileron role is not.
The last time I attempted a loop, it turned out, by definition, to be a barrel role.
Pouring a coffee during a barrel role is feasible.
Pouring a coffee during an aileron role is not.
The last time I attempted a loop, it turned out, by definition, to be a barrel role.
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sim ride
tried it in the sim and found the 744 a little bit nose heavy coming out of it ,lots of warnings. anyway who cares its not intended to give the pax a thrill just get em from a to b
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Almost Scotty...
I can change direction at 1 G... as long as I don't maintain level..
Currawong...
you can also do an aileron under +ve g at all times... you just can't do a level one. Start with the nose high and finish with the nose low... it's still an aileron roll as you are not looping.
Cheers Wombat
I can change direction at 1 G... as long as I don't maintain level..
Currawong...
you can also do an aileron under +ve g at all times... you just can't do a level one. Start with the nose high and finish with the nose low... it's still an aileron roll as you are not looping.
Cheers Wombat
