Attitude Flight Stabilization System (AFSS)
FY-21AP Version II is an advance Attitude Flight Stabilization System (AFSS) and Autopilot for RC aircraft.
The FY-21AP utilizes a 3-axis gyroscope and tri-axial accelerometer to form an accurate drift free attitude stabilization system. The unit also utilizes Global Positioning System (GPS) and a barometric altitude sensing for accurate 3-dimensional positioning of the aircraft. By combining attitude control and positioning, a comprehensive inertial navigation system and autopilot is provided to you in a small compact light-weight package.
The AFSS achieves its attitude control via FeiYu Tech’s proprietary algorithm; the unit calculates the aircraft attitude in 3-dimension and detects any changes to the model’s horizontal position. If attitude change occurs, controlling signals will be sent out to the plane’s ailerons, elevator and rudder to counter the change. By continuously doing this, the plane is kept in a state of stabilized equilibrium, resulting in a smooth level flight.
When activated, you only need to release the flight control sticks so that they return to the transmitter neutral (middle) position. The model will immediately revert to level flight. The unit can be activated or de-activated via a spare channel from your receiver.
GPS, Barometric Sensing and Autopilot
Upon initial boot up, the FY-21AP will search for GPS positioning signals. When a minimum of 5 satellites have been detected, a fixed position is established. The FY-21AP will record that position as the return to launch (RTL) point.
The on-board barometric sensor and GPS altitude readings will be combined to establish an accurate relative-altitude of the aircraft.
When the Autopilot Mode is activated via a spare channel, the aircraft will automatically turn and fly back to the take off point (RTL). The aircraft altitude will be constantly maintained. After reaching the home position, the plane will automatically circle with a radius of 120 meters. By using the same autopilot algorithm, you can also activate an auto circling flying pattern at a fixed altitude anywhere you wish.
DEVICE FUNCTIONS
FY-21AP Attitude Flight Stabilization System
Constant stabilized flight in any condition – the FY-21AP will automatically level the flight attitude of your aircraft in any weather condition. If you are just learning to fly, this will help you gain experience, log more flying time and increase your confidence. The FY-21AP can be activated throughout the flight duration, from take off to landing.
Emergency Recovery – in case you lose orientation or you feel the aircraft is out of control, activate the FY-21AP and let go of the control sticks. The FY-21AP will immediately bring the plane back to stabilized level flight.
Precision Flying: For the experienced pilot, FY-21AP can help you achieve more leveled and precise flight paths, especially when flying and landing in strong wind.
First Person View (FPV): For long distance flying or FPV, the FY-21AP will take over the job of leveling and stabilizing the plane for you. Just point the plane where you want to go and enjoy the view!
FY-21AP GPS and Barometric Sensor
Fixed altitude flight - When this function is activated, the unit will maintain your aircraft altitude. You only need to input the right throttle level and point the plane in the direction you want to go.
Return to Launch (RTL) – You can flip the designated RTL switch on your radio and the aircraft will return to the take-off point. RTL can also be programmed into your Receiver failsafe so that the aircraft returns home if RC link is lost.
Fixed Position circling – by activating this function, the aircraft will automatically circle the selected area at a fixed altitude. Very useful for aerial photography.
