OLA system gives you the option of controlling the stabiliser during the acceleration phase of the launch. This allows you to have more stable tension and a higher launch speed for the model.
During this phase of the launch the wing may twist slightly under the high loads. The twist may be wash-in or wash-out depending on the wing structure, main joiner location and strength of the rear wing location pins. The OLA system allows you to to compensate for this effect by smoothly increasing or decreasing the stabiliser incidence during acceleration. You have control over the initial delay, the rate at which the stabiliser moves and the final position so you can match the OLA trim changes to the requirements of your model and your style of launching. It is entirely in your hands whether you use OLA at all, just use it to stabilise the line tension, or use it to reduce line tension during the final part of the acceleration phase. A reduction in tension will reduce drag and this may result in a faster, higher launch.
The 3rd OLA switch must be fitted to the tow hook. During acceleration the OLA switch is ON when the hook is fully extended.
No additional devices are needed to use the OLA system. It starts to work after the latch opens during the acceleration phase of launch.
After the OLA start signal the timer waits for delay seconds and then moves the servo with constant speed to the final angle. If the model is not launched within restart seconds, OLA resets the servo to the starting position. The restart time is only used with the impulse tow hook because you can repeat the acceleration with this hook.
The more section of the FLIGHT program contains the lines:
| olat 0.50 4.00 | the delay (seconds) and restart time (seconds) |
| kola 30 00.00 | speed (degrees/second) and final angle (degrees) |
The minimum speed is 6 degrees/second. You can move the stabilizer up or down depending on the final angle of the servo. As with all servo position commands in the start, glide and dt sections of the FLIGHT program, the OLA speed and final angle are servo movements where the servo position is given as degrees within the range 0 (maximum up trim) to 90 (full down elevator). They do not specify the stabiliser position directly.