Thank God I used white glue & l girder

[rrinker]

Correct, servos are not stall devices. That's not the only reason they need a controlelr though, the position is determined by a pulse signal, the duration of the pulse determines how far the output shaft rotates. The controlelr has always been the epensive part, and servos have alsways been fairly heavy, to have high strength gears and a strong motor. The forces to move the control surfaces of even a smaller RC plane are pretty high. But int he past few years there have been lightweight small electric planes, these need lightweight small servos plus the forces aren't nearly as high as with a fast flying gas engine plane. Thus lightwight small servos. About the only place you might need a larger servo would be for a very low frog number handlaid all-rail turnout (non-hinged points) with high code track (100 or greater). Second, the controllers have gotten super cheap. A PIC chip can be had for almost pennies - and even the low end ones usually have a PWM output or two that can drive a servo. Even fancier bigger ones with tons of inputs and outputs are only a buck or two. Of course you need to knwo how to program one. Thus commercial products like the contollers from Tam Valley and Team Digital, or DIY ones (code provided for you) like the one Hans Deloof sells.

--Randy