Design work on the VariEze began in 1974, with the first prototype (known as Rutan Model 31) first flying on May 21st, 1975. After recieving a positive response at the Oshkosh Airshow, the aircraft was redesigned so it could be sold as plans. The following prototype, Rutan Model 33, was shown at the following year's Oshkosh, after which the plans were offered for sale. They continued to be available until 1985.