35 degrees
Trident was similar.
High speed delight to fly even in cruise back from Athens with the autopilot U/S but a handful on approach which was flown on the backside of the drag curve with mandatory auto throttle which was typical of the time..analogue and sluggish.
In comparison with the DC9 51 the Trident had loads of elevator control so flaring wasn't a problem.
DC 9 autothrottle was better but it is much easier to fly an approach with manual throttle.
Aerodynamically swept wing stability is interesting as I played around (and still do) with model aircraft. Low speed pitch unstable but very stable in roll but at high speed extremely pitch stable.
Tupolov; went onto the flight deck on a parked one in Sofia which had the access for the navigator position (nose) where the throttles should be in the instrument panel. Rumour was that the aircraft commander sat behind the pilots.