i have flown a gws slowstick in 25 mph winds once. that was really funny, i almost wet my pants
started flying in 15mph winds which i do all the time (1 pound "trainer" foamy 3 ch), then it picked up, way up.
thankfully i had my rimfire motor on it. (waaaaay overpowering the plane) and not my towerpro

i will fly spads in crazy wind, 30mph ish. its fun landing backwards.....[:@]