Moog Crossbow NAV440 Series - Manual (Page 105)

7430‐0131‐01 Rev. F
NAV440 User Manual Page 105
Appendix B. Application Examples
This section provides recommended advanced settings for tailoring the 440 Series unit of inertial systems to
different types of application and platform requirements.
Fixed Wing Aircraft
A fixed‐wing aircraft is a heavier‐than‐air craft where movement of the wings in relation to the aircraft is not used to
generate lift. The term is used to distinguish from rotary‐wing aircraft, where the movement of the wing surfaces
lane relative to the aircraft generates lift. The fixed wing aircraft can range in size from the smallest experimental p
to the largest commercial jet.
The dynamic characteristics of the fixed wing aircraft depend on the type of aircraft (such as glider, propeller
aircraft, and jet aircraft) and mission phases (such as launch, landing, and maneuver). For best results per dynamic
condition, the appropriate settings must be applied. Table 99 below shows four examples of dynamic conditions
with recommended configurations.
Table 99 Recommended Settings for Fixed Wing Aircraft
Dynamic Condition Recommended
Settings
Pre‐launch or known
straight and level un‐
elerated flight acc
Launch
Normal
Dynamics
fault) (De
High Dynamics
UseMags ON ON ON ON
UseGPS ON ON (< 4g) ON ON (< 4g)
FreelyIntegrate OFF OFF 1 OFF OFF (< 2g)
Stationary Yaw Lock OFF OFF OFF OFF
Restart Over Range ON OFF OFF OFF
Dynamic Motion OFF ON ON ON
Turn Switch Threshold 0.5 deg/s 0.5 deg/s 0.5 deg/s 0.5 deg/s
Z Filter Accel 5 Hz 5 Hz 5 Hz 4 15 Hz
Filter Rate Sensor 20 Hz 20 Hz 20 Hz 4 20 Hz
Rotorcraft
Rotorcraft is a category of heavier‐than‐air flying machines that use lift generated by rotors. They may also include
the use of static lifting surfaces, but the primary distinguishing feature being lift provided by rotating lift structures.
Rotorcraft includes helicopters, autogyros, gyrodynes and tiltrotors.
The rotor blade dynamics are faster than the fixed wing aircraft and contain high frequency components; however, it
may cause severe vibrations on the airframe. The overall dynamics (translational and rotational motion) of the rotor
craft are much slower than the fixed wing aircraft. Also ,the rotors generate significant aerodynamic forces and
amples of dynamic conditions and the recommended configurations. moments. Table 100shows two ex
1 FreelyIntegrate should only be set to ON for severe launch conditions. Normal takeoff dynamics that a standard aircraft would
experience will see the best performance with this setting in the OFF position.