ORIGINAL: jrf
Use the servo torque calculator link above and enter a normal control surface with 15 degrees of deflection. (Normal for sport flying.) Then just change the deflection to 45 degrees. (Normal for 3D.) That explains a lot.
Jim
I gotta believe that's pretty accurate, but it is astounding what effect speed has on required torque! No wonder we see "3-D" models rip themselves apart! I suspected but now I'm convinced I fly way too fast! Having 2-56 contol and/or flexible rods has probably saved me lots of models and certainly servo gear teeth!