![](http://www.alamy.com/thumbs/6/6096D547-77ED-45C8-86AF-768D4D1BD9CA/E3RHT0.jpg)
Charles M. Daniels Collection Photo
Size: 1953px × 1277px
Photo credit: © Aviation History Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: &, -540, -5, -540-1, /, 1820, aeronautical, aircraft, airplane, aviation, cn1820, company, corporation, flight, historic, history, kinner, kinnerairplanemotorcorporation, kinnerr5, kinnerr540, kinnerr5401, kinnerradial, motor, n214d, plane, pt-21, pt-22, pt21, pt22, pt22recruit, r540, r5401, radial, recruit, ryan, ryanaeronautical, ryanaeronauticalcompany, ryanpt22, ryanpt22recruit, ryansporttrainer, ryanst, ryanst3kr, ryanstk, sport, st, st-3kr, st3kr, stk, trainer