For Take-off and Landing, we recommend to use the fully closed (Slow) position.
For normal flying, after takeoff, move the trimmer to neutral.
For Cruising, open the trimmers to a comfortable position, stow the main brakes and steer using the tip steering handles – do not use the main brakes in accelerated flight.
From the Manual on OAA “OAA is an innovative system that stands for “One Action Acceleration-system”.
OAA allows experienced pilots to attain the full speed of the glider using the speed bar alone, without the need to release the trimmers.With OAA unlocked, the speed bar simulates, the release of the trimmers according to the position of the speed bar. This allows for a larger speed range that can be fully used in one smooth action of the speed bar to reach the maximum speed of the wing without the need to release the trimmers.
In order to use the OAA one must unlock the Brummel hooks connected to the rear of the risers below the trimmers. Prior to using the speed system, one should move the trimmers to the neutral position, at the blue mark on the trim webbing (all risers will be level in unaccelerated flight).
To Lock the OAA one must lock the Brummel hooks together on the rear riser. Locking / Unlocking is possible in the air, but is best done on the ground.
If Flying with the OAA locked, and you wish to reach the maximum speed, you must release the trimmers to the fully open position before applying the Speed Bar. The required force to apply the Speed Bar will be higher.
In the case of encountering severe turbulence, we suggest landing as soon as possible.
With the OAA Unlocked: We recommend not releasing the trimmers fully and then applying full speed bar. This will not give a greater speed range, and will make recovery from collapses slower. In the event of a collapse with OAA unlocked, or locked with trimmers fully open, release the speed bar (if applied) and use the rear riser for re-inflation rather than the brake.”
Basically when using OAA the trimmers should be at zero position and not opened completely.
The OAA brummel hooks can be managed in the air, just recommended not to adjust close to the ground – pay attention that you have enough altitude (to avoid obstacles and have the time to react for engine failure etc.)