Gunnar Mellgren was an engineer and worked for the Gothenburg Mechanical Engineering Company and later as manager of the Tändsticksbolaget Vulcan in Tidaholm.
His hobby was to design sailing yachts, and he designed many famous racers such as ‘Revanche’, ‘Ester’ and ‘Cakewalk’ and the big racer ‘Garm IV’, better known as ‘San Toy’.