A popular servo for smaller airplanes, helis, boats, cars and trucks, the HS-81 offers a fine balance between speed and torque. Motor Type: 3 Pole Bearing Type: None Speed: 0.11 / 0.09 sec @ 60 deg. Torque: 36.10 / 41.66 oz.in (4.8v/6v) 2.6 / 3.0 kg.cm Size: 1.17" x 0.47" x 1.16" 29.80 x 12.00 x 29.60mm Weight: 0.58oz 16.60g