I might be totally wrong, but a barrel roll is a smooth 1g maneuver. There is simply no lower risk maneuver. Its the same level of stress as any decent coordinated turn. Landings are much greater risk/stress.

If a design engineer has a problem with a roll, he is an idiot. The engine mounts will see way less force in a roll than any landing. Not to mention a crabbed landing.

Afaik, there exists virtually no aircraft that cannot perform a roll. Well, lighter than air craft excluded. Experimental Gyroplane guys do them all the time too.

| I had a slightly different perspective on this story on the first
| passenger jet:
| https://www.youtube.com/watch?v=AaA7kPfC5Hk
| <https://www.youtube.com/watch?v=AaA7kPfC5Hk>
| The design engineers were aghast because the engine mounts were at
| their limit in the roll. Wings stay attached but the engines fall
| off! Also I was told by a Boeing engineer the test pilot came a lot
| closer to losing his job than he depicts here.
|
| In fact the engineer I knew from Boeing was tasked with testing jet
| liner windscreens. He spent months designing and constructiing an
| air cannon that would hurl thawed frozen chickens close to mach-1
| into a mock up of the window to simulate a large bird strike. He
| said it was a very messy test.
|
| A key feature of a multihull constructed from foam sandwich is that
| it will inevitably stay afloat no matter what sort of damage it
| sustains. Quite different to any ballasted monohull.
|
| Rick
|
| > On 28 Oct 2018, at 10:52 pm, realink@iprimus.com.au [harryproa]
| <harryproa@yahoogroups.com.au> wrote:
| >
| > > 'I think it must be easier to do the calculations with airplanes.
| They operate in a homogeneous and compressible fluid.'
| >
| > within limits, which nearly always apply, I think its easier too
| >
| > it is rare for aircraft to do something original, and everything is
| organised around conventions. You can almost design an aeroplane from
| a data set of statistics. theres an author of a book 'Design of the
| Aeroplane' Darrol Stinton who virtually depends upon it. Start with
| an expected weight and the entire parts list can be mapped out. Its
| also true that aircraft design has been held up since the end of the
| second war because of adhering to the same conventions.
| >
| > In respect of everything else its still fluid dynamics

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