War Eagles Air Museum, Santa Teresa, New Mexico This aircraft was developed as part of a contract competition near the end of World War II. It lost out, but was intended as an observation and ambulance aircraft (as well as other light uses). Roughly 300 of these aircraft were built. Often referred to as the Stinson L-13. Stinson was a subsidiary of Convair, when Stinson was sold to Piper in 1948 the L-13 rights remained with Convair. It has been used extensively in bush flying.