I also try to find our what's the ideal servo specs to meet your demand? :rolleyes2: I had made servos since 1981. May be way much more than 50KK servos were made. :biggrin: We just make a new servo: GWS S03N3 S03N3 S D MG 2BB 6.0V 0.152sec 35.0kg-cm 4900mA - RC Groups A standard size servo that give speed and torque as below: S03N3 S D MG 2BB Test datas just measured as below: 4.8V 0.180sec 29.5kg-cm 3800mA 6.0V 0.152sec 35.0kg-cm 4900mA 7.4V 0.119sec 41.0kg-cm 5400mA 8.4V 0.111sec 43.0kg-cm 5700mA Let's compared with F Brand S9075SB Digital HT S.Bus Programmable Servo Dimensions: 1.59 x 0.83 x 1.47" (1-5/8 x 13/16 x 1-1/2") (41 x 21 x 38mm) Torque: 425 oz-in (31 kg-cm) at 6.0V Speed: 0.14 sec/60° at 6.0V Weight: 2.6oz (73g) Price: $199.99 But Tower Hobbies sell at: $149.97 GWS S03N3 S at 6.0V 0.160sec 35.0kg-cm 4700mA Pretty similar? Not exactly! Our S03N3 test datas were collected when stall for 30 seconds, let motor become very hot and weak. So, when motor is cool, S03N3 S D measured at 43~46Kg-cm. GWS price of GWS S03N3 S is MSRP $100.00, yet GWS is full CNC servo cases with 2BB and full metal gears which cut by Swiss machineand made in Taiwan. ●S03N3 ( STD ) 0.131Sec/[email protected] 0.110Sec/[email protected] 0.100sec/[email protected] 0.094sec/[email protected] ●S03N3 F ( FAST ) 0.115Sec/[email protected] 0.094Sec/[email protected] 0.078Sec/[email protected] 0.070Sec/[email protected] ●S03N3 XF ( XTRA FAST ) 0.094Sec/[email protected] 0.080Sec/[email protected] 0.067Sec/[email protected] 0.063Sec/[email protected] When test at motor still cold, about 20~25% more thrust than the specs said. I like to hear from you.