In 1928, after the Waco 10 had entered production, Waco changed its designation system so that the basic model 10, powered by a
Curtiss OX-5 engine became the
GXE. near
St Louis .
South Carolina Later aircraft used three-letter designations, the first denoting the engine (except for the two mailplanes), the second denoting the wing installed, S or T meaning Straight or Tapered wing, and the final O indicating it was a derivative of the 10. An -A suffix indicated an armed variant intended for export. Apart from the water-cooled
V-8 Curtiss and Hispano-Suiza engines, all of the rest were air-cooled
radials. Other engines were fitted experimentally, without unique designations, including the
Rausie,
Ryan-Siemens, and Milwaukee Tank engine. This last engine was an
air-cooled version of the Curtiss OX-5, and was intended as an aircraft engine. The
JYM and JWM were mailplane derivatives with a 14" fuselage stretch. In the 1990s the unrelated
The WACO Aircraft Company in
Forks, Washington offered a
homebuilt kit version of the ATO model. The WACO 240-A was a straight-wing fighter, built for export, powered by Wright engine. At least six were bought by the Cantonese Chinese aviation services. They were armed with twin .30 Browning machine guns and had racks for five or two bombs. There was also an export model WACO Pursuit 300T-A, with Wright or Wasp Jr engine. ==Surviving aircraft==