augustusjeremy
4 seconds per rotation = ~175'/sec.
175 feet/sec. = ~10,500'/minute = ~ 115 mph.
115 mph with an axis w/o horizontal velocity.
With horizontal velocity, add for lead, subtract for lag.
The wing tip or tail could have a velocity through air approaching 200mph.
Yes...
I am not an aerodynamicist but maybe the momentum exerted by the vertical stabilizer in this context in such a large (long) aircraft explains why they're harder to put into a flat spin.
It would depend on the center of rotation/gravity/mass, I believe