||Unacceptable changes to the longitudinal stability with small impact on
the vertical axis while diving. The characteristic deficiencies listed
under III) appear as follows:
In dive, the machine initially behaves normal with respect to longitudinal axis up to dynamic pressures from va = 480-490 km/h in HB = 2000 m. Above this speed, at va = 500 - 520 km/h, the machine experiences a jerky roll movement, in the direction of "rolling left", with simultaneous shift
in balance around the vertical axis in the "clockwise" sense.
If the speed is increased further, initially to about Va =
550 km/h, severe control forces against the left roll apply that
suddenly decrease with increasing dynamic
pressure when reaching the above-mentioned speed and now must be overcome in the other direction.
With a further increase of the speed to about 600 or 650 km/h,
symmetrical but very high aileron forces occur, without trim changes around the longitudinal axis being detectable.