If you thought digital servos were the exclusive domain of giant scale aerobatic airplanes and high-end helicopters, you'll be thrilled to know that JR has a digital servo for sport pilots. Benefiting from much of the same technology that goes into JR's premium digital servos, the DS811 Advanced Sport Digital Servo sets the standard in sport servos.
It is an excellent choice for sport applications, like 40- to .60-size pattern airplanes or .30-size CCPM trainer helis like the Venture™ 30CP. Matching it with a 4.8V battery pack yields an impressive 54 ounce inch of torque. Transit speeds are impressive too. With a 4.8V pack, the DS811 executes a 60-degree sweep in a brisk .18 seconds. Perhaps most impressive is that the DS811 offers all this extra performance for just a few bucks more than a standard non-digital sport servo, allowing anyone to enjoy the precise feel and unmatched accuracy of JR digital technology.
Add to all this JR's generous 3-year warranty, and it's easy to see why the DS811 is one of the best values in the hobby, if not the best in standard servos.
Digital and analog servos have very similar construction and components. They both use the same type of motors, gears, cases, and have a potentiometer. A digital servo is different in the way it processes the incoming signal and converts that signal into servo movement.
An analog servo when it receives a command to move, takes that signal and sends pulses to the servo motor at about 50 cycles per second, which in turn moves the motor to its required position determined by the potentiometer.
A digital servo has a micro-processor that receives the signal and then adjusts the pulse length and amount of power to the servo motor to achieve optimum servo performance and precision. A digital servo sends these pulses to the motor at a much higher frequency which is around 300 cycles per second. This helps eliminate deadband, provides a faster response to the servo motor, smoother motor movement, and has higher resolution and holding power than an analog servo.
There are some disadvantages to digital servos, but the disadvantages are not in any way close to out weighing the advantages. A digital servo will have a higher power consumption (Around 10 to 15 mAh per servo at idle) than an analog servo due to its higher pulse frequency, so larger capacity battery packs are recommended. Digital servos also are more expensive than analog servos which can get very costly in applications that require many servos.