i have an OS 120 "twin" any idea`s on starting points for props>? going on a 11-12 lb plane...
16x8 >?ish>?

A 16x6 would be a good starting place, normally a twin won't quite have the power of the same sized single.

right on thanks for reply,,,,,, this is my first "twin" and first 4 stroke. so this should be an experience.. heh..... should be fun though...
i guess i could buy a few different pitch`s and go from there.
16x6 and 16x7 ect ect... just props at this size are not like buying lil 10x7`s ya know>? they get proud of them.