Do you remember the old JR 507 servo? I can't tell you how many planes those old suckers flew without any problem. Then the ball bearing shaft supported version surfaced, the 517. We thought we were in heaven. I tell ya...more times than I can count, I have seen (and used) servos like the good ole 517 similar to the S148 futaba, in planes significantly larger than what you've got questions about, without problem. It was all in the setup, mechanical advantage, zero slop linkage...etc. The newer high powered servos do offer outstanding power, precision and speed...but at an even bigger cost if your setup isn't right

Chad