blave,
The rocket run entry used to be done as a bunt or low g pushover, but in 1969 an emergency flight warning went out for Cobras to avoid the low g. We simply pushed over a bit more gently, with no difficutly. The dive is a 1 g maneuver, and no sweat.
We all did "wingovers" or target returns, and they made us feel quite aerobatic. As long as you pull 1 g or more in the whole maneuver, it could be done safely.
The OH-6, and the UH-60, AH-64 and the S-76 all have moderate offset main rotor heads (4 to 5 %) that permit quite a bit of control at zero g. These aircraft can all be coaxed into impressive shows. We express the percent hinge offset as the ratio of the flapping hinge to the rotor radius, so a 25 foot rotor radius with the flapping hinge 1 foot from the center of the mast has 4% offset. This is a measure of the snappiness of the cyclic, and also of the control power remaining at zero g. Later in the week I'll post a little discussion of hinge offset for those who wish to go deeper into it. For a BO-105/BK-117/RAH-66 the hinge offset is in the 10 to 15% range, ideal for such messing around.