The 50# was the capacity of the scale I know, that's what the
was for.
19# out of a 30cc would be really good, my 31cc Ryobi couldn't do that. I have a 30cc Syssa that might, but I've not mounted it yet. It will be interesting to see if you get 19# static thrust.
The 110" is such a nice looking plane I've almost bought it about 5 times, I just don't have the room.