1906 R.E.P. I (Robert Esnault-Pelterie)
More information on the R.E.P I can be found at 1000aircraftphotos, photo number 9422
30 hp R.E.P. seven cylinder air cooled two row fan, four cylinders on the fromt row and three on the back row.
More information on the R.E.P engines found in Glenn Dale Angle's book Airplane Engine Encyclopeda (1921)
Also in Jane's all the World's Aircraft, 1910-11
The original 1907 R.E,P, No.1 was a gift from Robert Esnault-Pelterie to the Conservatoire National des Arts et Métiers in 1920.
Conservatoire national des Arts et Métiers, Paris, January 2013