Empresa Aeronáutica Ypiranga, commonly shortened to EAY, was a Brazilian aircraft manufacturer based in São Paulo and founded in 1931 by American Orton Hoover,[1] Brazilian Henrique Dumont Villares and German Fritz Roesler.

[2] In 1914, Orton Hoover came to Brazil to assemble three Curtiss-Wright seaplanes purchased by the Brazilian Navy.

He settled permanently in Brazil in 1928 and worked with Federico Brotero on the development of the IPT Bichinho[3] a single-seat sport aircraft.

Roesler founded a flight school near São Paulo in 1923 and, together with George Coubisier, Francisco Matarazzo and others, the VASP airline.

Empresa Aeronáutica Ypiranga began operations with the production of the EAY-101 glider, a copy of the Stamer Lippisch Zögling, of which six were built.