What size of RubberBands should I use on a 25 size trainer. Will number 64s work?

What size Prop should I use on a O.S. .25 FX ?

Thanks in advance

Neil

Prop: Sport Flying: 9X5, 9X6, 9.5X5, 10X4, 10X5.
I would use a 9x6.

The # 64 rubber bands should be ok.

The #64 bands actually fit a 25 size trainer better than they ft a 40 size. Its just hard to find the next larger size rubber band.

I'd start with the 9X5 for most sport/aerobatic types. 10X3 on a slow trainer such as the Kadet Seniorita. Somewhere in between there on most common trainers.

#64's will be fine and a 9x6 prop is a great choice.
Good luck