Goslow
A simple, compact, and inexpensive circuit has been designed which can be connected in between the receiver and a control servo. It regulates the time required for full servo rotation between 2 and 20 seconds without any reduction in the servo's torque. It is a proportional device that allows the servo to be positioned anywhere within the allowed servo travel and fully supports the adjustable travel volume that is available on most radio systems. Today's modern servos are reliable, powerful, smooth, and fast. Boy, are they fast! The time required for a full 90º of rotation typically varies between about 1/5 and 1/4 second. This is good news for control functions such as ailerons, elevator, and rudder where the quick response results in improved aircraft control. However, for other control functions such as landing gear retraction and flap extension, the speed of servo motion is less critical. In fact, it is often desirable to slow the control of these components for increased realism and in some cases, improved performance.
Servo Reverser
"A SERVO REVERSER? You have to be kidding! Why would I need that?" All but the very oldest RC systems allow the modeler to reverse the direction of rotation of a servo with just the flip of a switch, or in the case of the newest transmitters, with a couple of simple programming steps. Based on this, one might conclude that the need for servo reversing is gone forever. However, this is not the case. Highly maneuverable and aerobatic airplanes (Extras, Sukhois, and Caps, to name a few) are becoming increasingly popular with competition and sport fliers. With the trend to larger models and more-powerful engines, the need for reliable control-surface actuation is more critical than ever. A very effective method of controlling highly loaded flying surfaces is to minimize the length and complexity of control linkages by mounting the servos very near the flying surfaces that they control. In the case of split elevators, a popular practice is to mount a servo directly into each side of the fuselage, just below the horizontal stabilizer.
Optoglo
AN ONBOARD GLOW system can add safety and convenience to any model engine. Even in cases for which glow current is not required at idle, an electronic glow system can be connected to an unused radio channel, allowing the glow current to be switched on and off with just the flip of a switch on the transmitter. Optoglo is a general-purpose electronic switch for radio control (airplane, boat, car) applications. It is primarily intended to operate onboard glow systems for model engines, but with an operating voltage of up to 50V and a high current switching capacity, it can be used for on/off control of a wide variety of devices such as smoke pumps, lighting systems, or motors for Electrics. Complete optical isolation between the receiver and the switch circuit eliminates the possibility of interference from electrical noise. Its straightforward design uses readily available electronic components. The common glow plug is designed to be energized by a single Ni-Cd or dry cell battery.
