The propeller fitted to G-A YDY is 63 inches diameter and 32.4 inches pitch, and gives a satisfactory performance. The instruction manual for building issued from the P.F.A. office says that the propeller should be 60 inches diameter, and 34.8 inches pitch. 

The propeller fitted to G-ASEA at the time of our check flight was one intended for the Aeronca monoplane when fitted with the Aeronca-JAP engine; this is marked DRG DA 1O RHT JAP D 55 P 23.3 whereas the markings on the hub of the propeller mentioned in the instruction book shows it to be TYPE Z.5931. 

The resulting differences in performance are considerable, and are mentioned later.