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I will run it rich with a 8 X 3 prop and that should get me in the 50 MPH range.
At 50mph the poor thing will be dropping out of the air.
A smallish wing like that needs to have some airspeed around 70mph before it begins to operate in any sort of competent manner.
I build what we call 2.5 (.15) Slow combat models. At least 44" span and 8" chord. It still flies relatively fast, but will turn tight and doesnt slow down when asked to perform.
Regards
Greg