It is hypothesised in the present paper that paddlewheels work better when
backsplash is avoided, which was visually observed when running faster than 76
rpm. Backsplash could be avoided by A/C frequency control or by fitting an 18:1
gearbox instead of the standard 14:1. It is believed that backsplashing caused
paddlewheels A and C to display a flattening of the SAE performance curves above
76 rpm.