RE: Which props to which engines??
The Enya 35 will be an iron piston so it needs 25% all castor fuel. Run it on this fuel and it will never wear out. Almost literally! For RC use the Enya chart suggests 10x4 to 11x6. There are several versions of the 35 but only detail differences.
There were also several versions of the 45, two of them are baffled piston and a Schneurle ported 45X with AAC construction. The chart for the model 6001 (baffled piston, two rings) suggests 11x5 or 11x6. The model 6002 (baffled piston, single ring) suggests 10x5 to 11x6. The 45X suggests 10x4 to 11x7.