The Calidus features a single main rotor, a two-seats in tandem enclosed cockpit with a complete aerodynamic cockpit fairing, tricycle landing gear with wheel pants and a four-cylinder, air and liquid-cooled, four-stroke, dual-ignition 100 hp Rotax 912 engine or turbocharged 115 hp Rotax 914 engine in pusher configuration.
The aircraft fuselage is made from composites and is a faired teardrop shape to ensure smooth airflow over the variable pitch pusher propeller. Its 27.6 ft diameter rotor has a chord of 7.9 in. The aircraft has an empty weight of 584 lbs and a max gross weight of 990 lbs, giving a useful load of 408 lbs. The design incorporates vibration dampers that greatly reduce the level of main rotor vibration transmitted to the cockpit.