FY21AP II and AP117 Multipack

FY-21AP Version II is an advanced Attitude Flight Stabilization System (AFSS) and Autopilot for RC aircraft.  This package also includes the On Screen Display (OSD) which overlays the information from the FY21AP II, including the revolutionary IMU generated artifical horizon, to your goggles.

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 sensor 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-dimensions 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 Tx 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.

OSD, GPS and current sensor are included with this device and barometric sensor, gyroscopes and accelerarometers are built in.