Jim, my son is using the soft brake function with his Hacker 90 controller and C50XL. The prop does not stop in the air, in fact, the brake seems to kick in right after landing and he is pulling the trim down past his low idle position and the prop will stop. It doesn't stop suddenly, it takes about a 1/4 revolution to stop. I don't think there is any (or very little) gear strain during this stop.

Don Atwood