Originally Posted by
RetiredF4
And now the 1g barrel roll people please explain, how you are going to do that with a constant 1 g.
Exactly !
You can't do a 1g barrell roll without finalling crashing into the ground.
And the reason is simple:
God's own G.
Meaning if you want to keep 1g on the airframe even while inverted, you will be accellerating towards mother earth with 9,81 m/s * (1-cos Alpha). alpha being the angle of bank.
The longer you are inverted, the more vertical descent rate you build up.
If not exceeding 1g you will not be able to arrest this descent.
Therefore the slow roll rates of an airliner make this maneuver so much more problematic than in an aerobatic aircraft. Not only will the latter be able to take more g, it will even require less due to the shorter time in inverted position and thus lower descent rate.
Alternative is to go below 1g while inverted but this causes other problems like fuel feed.