He was involved in the development of the fighters Saab 35 Draken and Saab 37 Viggen, and later headed R&D at Saab where he designed a number of prototypes, including a rocket propelled interceptor, nuclear weapon carriers, replacements for the Draken and Viggen, and a supersonic business jet.
•
There he became famous for fitting captured Russian engines to the obsolete French fighter Morane-Saulnier M.S.406, thereby creating a first rate fighter, the Mörkö-Morane ("mörkö" being Finnish roughly for "bogeyman" or "hobgoblin").