RE: Impact
I weighed a stab half before and after, each stab half was about 0.2 ounce increase. I got lazy and didnt keep track of the rest.
The plane weight is 10#9oz w/ vinyl. I added a crutch as you see, using a 5 cell nimh 2250 battery, 9311sa aileron, 8411 rudder, 3421sa stabs, YS 1.6, ES pipe. NB soft mount.