C-FNKZ, a privately operated Belair Raven Amateur Built aircraft, was conducting a flight from Sault Ste. Marie Municipal/Sanderson Field, MI (KANJ) with 2 persons on board. Shortly after becoming airborne, the aircraft was observed departing controlled flight, and nose-dived into the ground next to the runway. The 2 occupants were fatally injured. The aircraft was substantially damaged. The NTSB is investigating.