This HiTec servo is a multi-turn servo winch. Depending on the RC system used, you can get up to 4 full 360 degree revolutions of high torque out of this servo.
For a general servo overview manual follow this link.
These are HiTec HS-645MG Ultra Torque Metal Gear Servos for your Heavy Duty needs!
The HS-805BB is one monster of a servo. The HS805BB develops enough torque to move just about anything whether its a large plane, boat, or robot. Whatever it may be the HS 805BB can move it and move it fast.
This is an Enclosed 4-wheel drive remote control robot kit. It uses four powerful wheelchair motors and the inside robot cavity has plenty of room for electronics.
900 MHz 3 dBi Rubber Duck Antenna - RP-SMA Plug Connector