The Uniroo robot is kinematically similar to a real kangaroo of mass 6.6 kg. The body is a bolted framework of aluminum struts, and the leg is composed of welded aluminum tubes.
Hydraulic actuators control each joint.
A steel coil spring at the ankle stores elastic energy during stance. The Uniroo differ from the previous robots in four important respects. Because of the asymmetry, the ground forces during stance affects the body pitch. A massive leg also affects the body pitch as the leg is swept forward during flight. Finally, the kinematic redundancy of the leg must be addressed.