In my H9 Super Cub I used 8 futaba S3305's all around, they work just fine for that aircraft.
The Sig cub is a floater at 16 lbs, that's what mine weighted in at when I first built it back in 94... 18 to 20 lbs, with the right engine really makes a difference how it flies, especially in moderate winds.
After refurbishing my Sig cub, it weighs just about 21lbs... throttle and aileron servos are small digital's so I could hide them in the wing roots; S9650 for the throttle, and two S9551 for the ailerons... for the rudder I used a S9156... and for the elevator I used a S9155... and then a couple micro S3154 for some custom animation operations.... Oh, and a S3152 for the horizontal stab trim jack screw operation
John M,