ImmersionRC Vortex 250 Pro - 20A ESC High-end 32-bit processor, using the latest FET and driver technology to create an ESC which is only 9.4mm wide. Standard ESC used on the Vortex 250 Pro. A good upgrade for the Vortex 285, which normally uses an older 12A design. With the 20A ESC larger motors can be used on the 285.