Appendix I. BFF Motorised Trim Wheel.
V1.321 of the CL Software adds support for the BFF
Motorised Trim Wheel. Use Tab 7 Item 25 in the Configuration Manager
(v1.16+) to enable the MTW support. For more details of the MTW see
The Motorised Trim Wheel acts in the elevator axis only
and is active only for modes in which the CL system has elevator
To enable the MTW support:
- Set Tab 7 Item 25: Enable Elevator Motorised
- Ensure that trim button input is set for the
elevator axis: Set Tab 7 Item 1 = 2.
The CL software will actually ignore the assigned button input
but the setting will allow it to output trim wheel position
demand when A/P is engaged and so allow the trim wheel to move to simulate
the axis unloading.
The BFF Trim Wheel Controller software can be set to read the
trim input buttons directly to provide an electric trim
- Set Tab 7 Item 16: Elevator Auto-Trim Enable
This is a technical setting, it is used by the BFF Trim
Wheel Software to adjust the position following sensitivity of
the trim wheel.
It sets the position error at which the Proportional term of the
position following algorithm produces maximum response speed.
Increasing the value softens the MTW response to A/P trim
movements by allowing bigger errors before max speed is
A value of 25 is recommended for the setting. Sensitivity can be
more directly adjusted using the MTW software settings.
When the motorised trim wheel is active the CL
system will accept elevator trim adjustment by manual turning or
button induced movement of the trim wheel. The trim adjustments will
have the same effect on stick loading as normal.
When A/P pitch control is engaged
the trim wheel will rotate automatically under control of the CL
software. The movement auto-trims the elevator axis whilst the stick
follows A/P pitch control actions. This simulates unloading of A/P
servos acting on the stick, and the result is an active trim
movement of the wheel whilst A/P is active. It also results in a
force balanced stick when A/P is disengaged which gives a smoother
A/P disengage transition to manual flight control.
Flying with an integrated
motorised trim wheel provides a more complete simulation pitch
The motorised trim wheel support is enabled
internally only when the CL system has elevator axis trim authority. This
is the case in most flight modes, however Heavy Jet Mode 1 and when
CL system trim is manually switched OFF are two examples of when elevator trim
authority stays with the flight sim software. In these modes the
trim wheel software can work directly with the flight sim instead.