The Caudron C.51 was a French biplane floatplane made by Caudron in the early 1920s.
One C.51 was built, powered by a Clerget engine and bearing the registration ''F-AIBL''. It had an empty weight of and a maximum speed of .
It competed in the Monaco meeting in April 1921, piloted by Poirée.
[ He won the first speed contest by flying the course in 45 min 27 sec, an average speed of about , winning the 12,000 Franc prize.]
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{{Caudron aircraft
1920s French military trainer aircraft
C.051
Biplanes
Single-engined tractor aircraft