Designed as an economical single-seat ultra-light training aircraft for pilots of very limited experience, the NU-25 Kunang first flew circa 1957-58, and was roughly equivalent to the Druine Turbulent in terms of size and performance. The same aircraft, “04”, was later fitted with a 35 h.p.engine and an enclosed cockpit with canopy.
The tapered wings and swept fin of the NU-25 Kunang were replaced in stages on the NU-35 Super Kunang, probably built using the same airframe, initially with a constant-chord wing of 25 per cent greater area and later an unswept fin, as seen here. An uprated 35 h.p. Volkswagen engine was also fitted.