In the mid-1950s the SGS 1-23 was in full production and through successive models was performing very well in competition. By 1957 the development of
fiberglass-reinforced plastic affected the production of many sporting goods, such as boats and fishing rods. Schweizer Aircraft thought it was only a matter of time before a fiberglass sailplane was produced. This concern was borne out in 1965, when two German fiberglass sailplanes were entered in the world championships. • Schweizer 2-27 • Schweizer 7-28 • Schweizer SGS 1-29 Of these, only the SGS 1-29 proceeded to prototype stage. ==Design and development==