PowerBox Systems iGyro SRS Instruction Manual page 18

The Delta x2 function is intended specifically for models with a delta wing
and a twin thrust vector control system, and allows the thrust vector
system to be operated in combination with a delta mixer. The second delta
mixer is available at outputs AILERON-B and ELEVATOR-B.
5.3. Delta limiter
The default value here is 0%, which means that the elevons (control
surfaces) never run beyond the end-point set at the transmitter, even if the
pilot gives a combined aileron and elevator command equating to full
travel simultaneously. If you set the limiter to a higher value, the calibrated
values can be exceeded accordingly.
This value should be adjusted with the aileron and elevator sticks moved
to full travel: ensure that the servos do not strike their mechanical stops at
any extreme of travel.
5.4. Gyro Sense x4
This option quadruples the gyro effect; this is often necessary with large,
sluggish models in order to obtain the optimum stabilising effect.
Caution: Select this option only if 100% gyro effect is inadequate!
Selecting this option resets all gain settings to 0%!
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