G'day HighPlains
My 13x6 prop is the minimum and it has a 14x 7 at the top end of propellor choice, as stated in the thread and also most of the members of Central Coast RCA Club use the same prop on their .75 size engines. With living on the east coast of Aus, we get hot humid days all year round. My Plane flies well, my other Boomerang has an ASP .61 with a 12x6 prop on it and flies reasonably well. Thanks for your input and will check it out.

Yours Sincerely

Albi-Wan