 The company realized that the new trainer should have similar performance to the 1-26, in order to be used as the 1-26's two seat transition trainer.SGU 2-22 production was ended at serial number 258 in 1967 to commence production of the new model.The SGS 2-33, indicating "Schweizer Glider, Sailplane, 2 Seats, Model 33", was designed by Ernest Schweizer.