Spinning an Airliner
#41
If the simulator is an accurate duplication of the airplane you can definitley roll an A-320 with flight controls in normal law. Remember the rudder is connected controlled directly with cables and hydraulics. The way I've done it is to load up the nose and pump full rudder in the sim she rolls right around and pretty snappy to.
In the real airplane you'd most likely shed the vertical stab as historically Airbus tails seem to be attached with Elmer's glue and balsa wood.
Once again and in the simulator only I had a lady put a B-777 into a fully developed tail slide and then a violent spin that led to a simulated smoking hole one night on a nose high unusual attitude recovery! I gave her the nose high and instead of doing the briefed and SOP for recovery she freaked jammed in full power and held the nose up to almost a vertical profile. The sim hung there for a bit then fell into a tail slide when it did she pumped in full rudder and the sim snapped over on it's back and entered the prettiest inverted spin you've ever seen. I let it go just to see what would happen, we did about three or four turns losing about 10,000 feet before hitting the simulated ground and there was nothing that worked for a recovery.
Once again I don't have any idea how accurate the simulation was. But it was a pretty cool ride knowing, obviously that you were in a sim and weren't really going to get killed at the bottom.
Navy trained pilot too, in case you were wondering.
In the real airplane you'd most likely shed the vertical stab as historically Airbus tails seem to be attached with Elmer's glue and balsa wood.
Once again and in the simulator only I had a lady put a B-777 into a fully developed tail slide and then a violent spin that led to a simulated smoking hole one night on a nose high unusual attitude recovery! I gave her the nose high and instead of doing the briefed and SOP for recovery she freaked jammed in full power and held the nose up to almost a vertical profile. The sim hung there for a bit then fell into a tail slide when it did she pumped in full rudder and the sim snapped over on it's back and entered the prettiest inverted spin you've ever seen. I let it go just to see what would happen, we did about three or four turns losing about 10,000 feet before hitting the simulated ground and there was nothing that worked for a recovery.
Once again I don't have any idea how accurate the simulation was. But it was a pretty cool ride knowing, obviously that you were in a sim and weren't really going to get killed at the bottom.
Navy trained pilot too, in case you were wondering.
#42
Gets Weekends Off
Joined APC: Feb 2011
Posts: 787
#43
This is a fascinating topic. I do not think sims are very good at predicting fully developed spins for a number of reasons-
1. They do not need to model it because few transport aircraft are certified for spins to begin with (none).
2. The cost of certifying the sim for spin dynamics would be significant.
3. Spin dynamics are very difficult to model, and even normal flight behaviors are tweaked using test pilots. How many of these pilots do you think are available to offer their opinion on how a given airliner behaves in a spin?
On the other hand, it is certainly possible to put some first-order spin dynamics into the sim for the sake of completeness. How accurate it is would be questionable. I also would not take very seriously any structural failures the sim claims in the spin, it can't make accurate analysis of stress in a flight regime that is largely guesswork and in this case is not even modeled to second order. It may be able to decide whether a wing is going to fall off in the recovery since that is similar to other actions, but the rest is not going to be very accurate past the entry phase of the spin.
1. They do not need to model it because few transport aircraft are certified for spins to begin with (none).
2. The cost of certifying the sim for spin dynamics would be significant.
3. Spin dynamics are very difficult to model, and even normal flight behaviors are tweaked using test pilots. How many of these pilots do you think are available to offer their opinion on how a given airliner behaves in a spin?
On the other hand, it is certainly possible to put some first-order spin dynamics into the sim for the sake of completeness. How accurate it is would be questionable. I also would not take very seriously any structural failures the sim claims in the spin, it can't make accurate analysis of stress in a flight regime that is largely guesswork and in this case is not even modeled to second order. It may be able to decide whether a wing is going to fall off in the recovery since that is similar to other actions, but the rest is not going to be very accurate past the entry phase of the spin.
#47
There isn't an airliner flying that couldn't do a properly executed 1G barrel roll. That's the whole point of a barrel roll it creates no undue stress on the airframe it is a 1 G maneuver.
Refer to post # 23 and listen to what Tex has to say about doing a barrel roll.
#48
Yep, the Concorde pegs the cool factor meter as far as civilian aircraft go. But boasting about barrel rolling it isn't really saying much, based on your point above.
#49
But boasting about barrel rolling it isn't really saying much, based on your point above.
#50
A C-160 Transall barrel roll
Not quite an airliner, but quite a roll!
YouTube - Transall C 160 Roll
This is said to be a French transport over Africa.
YouTube - Transall C 160 Roll
This is said to be a French transport over Africa.
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