Heave Cue Settings
cue tuning settings can be made by manually adjusting the parameters
in your .bff configuration file (see section
4), or by opening the heave settings window using the R
button on the motion driver.
Heave settings window includes input fields for the detailed
parameters. Unlike the Pitch and Roll cues there is no settings wizard
for the Heave cue; this is because the settings are fairly simple to
For details of each of
the parameters hold the mouse over an input text field and a
pop-up help window will appear.
The main scaling parameters to fit the
required heave acceleration to the heave range of the
are circled in blue. They are the heave
acceleration magnitude to fit to the working range and the heave
acceleration cap level - it is usual to make these equal. Their
value depends on the magnitude of aircraft heave acceleration you
wish to capture in the platform motion. I suggest values that allow
reasonable general heave motion as the aircraft moves about in
normal weather conditions and which gives good runway touch-down
Use the Capture button to record the typical heave
acceleration for your choice of aircraft and flying style.
The noise and washout
filter time constants are circled in
acceleration smoothing/delay filter. This controls the speed with
which the platform heave reacts to changes in aircraft heave acceleration by filtering out the higher frequency components of the
acceleration. Setting larger values (longer time constants) in this
low-pass filter removes more of the fast changes and slows the heave response.
2. The heave cue washout filter. Increasing the value
here slows the washout to mid. However a reasonably quick washout is
required in the heave axis to ensure that the limited range of
movement is not constantly saturated.
3. Heave cue final
smoothing filter. This low-pass filter can be used to remove noise
from the final heave cue. Increasing the time constant value will
increase the noise filtering effect and also slow the heave cue
response. Again, the heave cues need to be fairly sharp to be felt
in the cockpit so a low value for the filter is usual.
Two special settings
are circled in green. These are scaling
factors that determine the strength of the "manufactured"
light-turbulence heave motion and runway heave effects. In FS9/X
especially straight and level flight can result in unrealistically
low heave movement of the aircraft. The first parameter sets the
proportion of a recorded light-turbulence heave motion that can be
added to the live motion.
The second parameter
sets the magnitude of the manufactured runway heave motion to be
added whilst the aircraft is on the ground. See
section 4 for details of the runway heave
to calculate the detailed range and scaling settings. These are then
displayed in the upper part of the window.
Use and Save
The changes you make
manually to settings or changes made by the wizard will not be made
active until the Use button is clicked. They will then be
made active in the current driver session, but will not be saved to
your .bff file. To save the changes to your file you must use the
IMPORTANT – Take great care when making
changes to the cue settings as they can directly impact on the motion
range. It is recommended that the adjusted cue output is viewed in
the Virtual Oscilloscope and its stability assessed BEFORE the driver
is put back in Drive mode and the platform made active.