I have a Airush Pilot 6m. Its the smallest size made in the pilot line.
It is cut like a GTO and feels pretty small and is very stable and handles gusts well.

I rode an ATV several years ago. It flew bigger than the number, not smaller. In other words, I think Rick is right. I can hold down the little green pilot in 40 fairly easily. I wouldn't want to try that on that ATV :shock:
Maybe I am wrong, I really hope I have the kites mixed in my mind
Try it in 25 to 30 first, not 40, just to be safe.