I have searched the Futaba servo web site and they do not say either holding or dynamic torque. Holding torque is the maximum restoring torque developed by the servor when energized. The dynamic torque is also called running torque or pullout torque. As a rule of thumb, the maximum dynamic torque is about 70% of the holding torque.

At 4.8v the S9001 is rated at 54oz-in and at 6.0v is is rated at 72oz-in.

The Futaba S9001 is a coreless ball bearing servo and can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps.

Personally on a GP Giant Super Sportster, I use S9001 with 6.0v batteries and I am very pleased.