service:

Rotachain uses a double acting pneumatic rotary drive.
Thereby two pistons are standing opposite to each other in a casing, and move opposit to one another while rotating a centered shaft.
Advantages of a double acting drive:

as two pistons work simultaneously, twice of the power is produced as in a linear drive with the same piston diameter

small headroom, as a result usable with limited space conditions and vehicles with low tyre sizes

to regulate the forces, springs are applied to the casing, which at the same time prevent the arms from sinking to the road in case of air leak

by the different transmission ratio a slewing radius from 220°(standard) up to 270° is practicable