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AFM 4-2

Landing Options

A deep-stall can be performed automatically or manually. In an automated deep-stall, the operator 
chooses where the aircraft should land on the map in Swift GCS. In flight, the aircraft will fly the 
entire approach and landing using the aircraft's wind estimation to pick an optimal path. 

With a manual deep-stall, the safety pilot needs to determine the wind direction and then choose 
when and where to begin the landing. Once initiated, the safety pilot steers the aircraft during the 
descent.

Auto Deep-Stall 

For an auto deep-stall, the user chooses the landing location in Swift GCS. It is recommend to 
physically check your landing spot before takeoff to ensure you are not accidentally landing on 
hidden obstacles, and to verify that the location is actually where you want it. As such, there are two 
helpful ways to do this in Swift GCS: use the Moving Base feature to verify location, or use the 
aircraft location after it is powered on. Auto deep-stall must be done to a landing location that is at 
the same elevation as where the aircraft was armed.

Lynx will automatically begin the landing sequence at the end of a mission or when commanded. 
The auto deep-stall begins with the aircraft flying to the landing waypoint to loiter 

(Item 1)

. The loiter 

allows the aircraft to estimate the winds at the landing location. The loiter altitude, or entry altitude, is
typically 60 meters AGL but can be changed depending on obstacles or terrain. In general, a higher 
entry altitude reduces landing accuracy. 

Lynx will circle the landing spot at least once and then choose its approach path. The approach path 
will attempt to land directly into the wind based on the aircraft's wind estimation. As such the aircraft 
will exit the loiter with a tailwind and then circle back around to the landing spot facing into the wind 

(Item 2)

. The approach path is displayed in the GCS once picked.

The aircraft flies the approach path and continues to update its estimate of when to begin the deep-
stall to hit the landing spot. This is indicated by a line that crosses the approach path 

(Item 3)

.

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Содержание Lynx FarScight

Страница 1: ...AFM 4 2 Lynx FarScight Unmanned Aircraft System Aircraft Flight Manual www SRP aero...

Страница 2: ...4 16 September 2014 AFM 2 1 16 January 2015 AFM 2 2 28 February 2015 AFM 2 3 08 March 2015 AFM 2 4 21 April 2015 AFM 2 5 20 August 2015 AFM 2 6 04 December 2015 AFM 2 7 16 December 2015 AFM 2 8 04 Ja...

Страница 3: ...Swift GCS 2 Information Displays 3 GCS Units 3 Preflight 4 Mission Planning 4 Moving Base 4 Handheld Transmitter 4 Flight Modes 5 Guided 5 Auto Waypoint Navigation 5 Rally 5 Cruise 5 Manual 6 Changin...

Страница 4: ...ap and Sidelap 13 Lead In and Overshoot 14 Statistics 14 Rally Points 14 Section 5 Deep Stall Landing 15 What is a Deep Stall 15 Landing Options 16 Auto Deep Stall 16 Manual Deep Stall 18 Deep Stall A...

Страница 5: ...Deepstall Test in Swift GCS 27 Exhausted Camera Battery Inflight 27 Telemetry Connection Problems 27 Warnings 28 Arming Errors 30 Section 10 Scheduled Maintenance 31 Servo Replacement 31 Section 11 R...

Страница 6: ...AFM 4 2 Battery Cell Discharge Curve 43 Appendix III 44 Autopilot Carrier Board LED Codes 44...

Страница 7: ...stabilator are constructed of Kevlar over a foam core Foam landing pads are fitted beneath the fuselage to absorb energy for deep stall landings The main airframe components are assembled without tool...

Страница 8: ...ail remains defleted Lynx is steered during the descent by the autopilot or by the safety pilot if landing manually Unlike a parachute the deep stall can be aborted to resume flying as needed The wing...

Страница 9: ...eads Up Display HUD an expandable messages panel top status bar bottom status bar and wind indicator The HUD displays aircraft attitude information similar to manned aircraft The messages panel displa...

Страница 10: ...justed Moving Base Swift GCS is capable of reading the GPS position from a GPS equipped laptop or tablet and displaying it on the map This is referred to as moving base and can be quite useful for sit...

Страница 11: ...ll change flight modes to Rally automatically In flight the operator can select specific waypoints to fly to within the mission using the Auto menu within the GCS or restart the mission entirely For m...

Страница 12: ...ol Safety Pilot Operator Operator Safety Pilot Result Manual Control Autopilot Control Autopilot Control Manual Steering Safety Devices Lynx is fitted with a variety of safety devices to protect crew...

Страница 13: ...ilot outputs and control loops If the main autopilot locks up or loses power the IO processor is powered independently and will allow the aircraft to be flow manually Low Voltage Cutoff and Current Li...

Страница 14: ...ore than 5 seconds This gives the operator a very small margin approximately 5 minutes to land the aircraft while remaining within safe battery margins GCS failsafe A GCS failsafe will activate if the...

Страница 15: ...Range Line of sight LOS Takeoff Takeoff Method Hand launch Auto Takeoff Climb Angle 15 degrees Distance to clear 18 meter obstacle 60 m with 5 m s headwind Distance to clear 50 meter obstacle 150 m wi...

Страница 16: ...Prohibited Maneuvers Launch or landing with any tailwind Flight into known icing conditions Flight into visible moisture Flight beyond safety pilot s visual line of sight LOS Flight beyond telemetry...

Страница 17: ...rts uploading 15 waypoints Updating the Autopilot Firmware Due to the large number of changes that can happen with an autopilot firmware update it is recommended to wait for a new release to be tested...

Страница 18: ...firmware has been uploaded you will be prompted to automatically update parameters to the new values This is recommend otherwise you will later note that the automated parameter check during the prefl...

Страница 19: ...ading control the direction of the flight legs Flight legs should be perpendicular to the prevailing wind crosswind This will cause the aircraft to crab in flight but will result in a consistent groun...

Страница 20: ...umber of flight legs Distance is linear distance of each flight leg excluding turns Time is the estimated duration to complete the survey Note that the time estimate is based on a zero wind situation...

Страница 21: ...escends will vary based on the winds A wind speed of around 9 m s will result in a nearly vertical descent Less wind will shallow the descent higher winds will cause the aircraft to actually travel ba...

Страница 22: ...is powered on Auto deep stall must be done to a landing location that is at the same elevation as where the aircraft was armed Lynx will automatically begin the landing sequence at the end of a missio...

Страница 23: ...AFM 4 2 17...

Страница 24: ...only flight surface that can be moved during a deep stall Deep Stall Abort Both auto and manual deep stall landings may be aborted during the approach or after the aircraft has stalled The most common...

Страница 25: ...int within Swift GCS 2 Mission Upload Ensure that the mission with the land waypoint has been uploaded 3 Landing Start From the Land menu select Start landing sequence to begin the auto deep stall app...

Страница 26: ...steering with the rudder 8 Aircraft Disarm Once the aircraft is on the ground disarm by pressing the disarm button on the preflight tab in Swift GCS Caution If a loss of link is encountered on the gro...

Страница 27: ...ctions on PPK tagging please consult the PPK Appendix The autopilot has a removable micro SD card that stores flight logs The flight log is needed to geo tag photos Start by removing the camera from t...

Страница 28: ...log the folder containing the photos from the flight the synchronization photo and where you would like the tags to be saved Once all the required fields have been selected select Tag photos to begin...

Страница 29: ...andheld Transmitter Low Battery The transmitter will signal that its battery is low with an on screen warning This is a critical emergency and the aircraft must be landed as soon as possible Avoid thi...

Страница 30: ...will become exponentially erroneous over time Do not rely on it to continue the mission or to navigate home 1 Mode Manual safety pilot 2 Land As soon as practical safety pilot GCS Crash Inflight If th...

Страница 31: ...ly on the loss of GCS telemetry or handheld transmitter The operator can also adjust the amount of time before the aircraft will change modes To do this when connected to the aircraft on the Settings...

Страница 32: ...s checklist step is failing or the aircraft is refuses to arm due to a compass error Before starting a compass calibration make sure that the payload is installed in the aircraft and that the aircraft...

Страница 33: ...shut off and how much imagery you may be missing Do this by geo tagging the imagery and viewing the photo locations on the map in Swift GCS To reduce the chances of exhausting the camera battery befor...

Страница 34: ...warnings that can occur in flight and on the ground While some warnings are common during the preflight never takeoff with any warning active If a warning persists during the preflight reboot the airc...

Страница 35: ...ll be available Land as soon as practical Bad magnetometer health Indicates that one or more of the magnetometers are unhealthy Land immediately Bad barometer health Indicates that one or more of the...

Страница 36: ...stent The accelerometers are not providing consistent readings If the autopilot has reached a temperature above 55C click on the GPS icon in the top status bar to see the temperature an accelerometer...

Страница 37: ...0 hours of flight time This is a preliminary hour interval until discrepancies between the servo manufacturer s data sheet and claims can be resolved Please contact support srp aero for more informati...

Страница 38: ...vice regarding repairs please contact support srp aero List of Common Replacement Hardware Item Hardware Specs Wing Bolt Nylon 1 4 20 x 1 2 hex cap screw Motor Bulkhead Screw Nylon 6 32 x 3 8 Philips...

Страница 39: ...be to the top of the rudder 7 Stabilator Arm Connects to the elevator servo and actuates the stabilator 8 Folding Propellers 15x10 Aero Naut CAM folding propellers 9 Repair Tape Gaffers tape 10 Motor...

Страница 40: ...r to remove the nut and screw attached to the propeller yoke Place the new propeller blade root into the yoke ensuring that the printed lettering on the propeller is facing forward Insert the screw an...

Страница 41: ...t spacer Insert the new wing bolt and turn clockwise Use the wing bolt spacer and socket if difficult to hand turn Tighten down the new wing bolt until it touches the spacer The spacer should leave ro...

Страница 42: ...acing the Motor If the motor does not spin freely has a bent shaft or makes a loud whining noise it must be replaced First open the battery bay and remove the battery Disconnect the three ESC wires co...

Страница 43: ...t removed grasp the motor and twist the hub off Never attempt to pry the hub off by leveraging a screwdriver between the fuselage and propeller hub Left plastic spinner removed Right Motor removed wit...

Страница 44: ...y stripped gears makes a clicking noise or cannot hold its position properly it must be replaced The same procedure is used for either servo Disconnect the control rod using a Philips screwdriver and...

Страница 45: ...ped but the Kevlar skin will remain resilient as long as it is not cut Adhere gaffer s tape to the flat side of the skid pad Use the tape to bend the pad such that it matches the curvature of the fuse...

Страница 46: ...ing delamination To repair the wing pull back the lifted Kevlar skin and apply a foam safe glue i e polyurethane Gorilla Glue in the USA to the exposed foam Smear the glue with a paper towel or cotton...

Страница 47: ...AFM 4 2 The wing is taped and clamped until dry Once dry remove the tape and peel away or sand any remaining glue 41...

Страница 48: ...ower is connected to the ESC This notice may be disabled in Castle Link Low Voltage Cutoff Main battery voltage dropped below the cutoff value The default is Auto LiPo which sets the cutoff value base...

Страница 49: ...AFM 4 2 Appendix II Battery Cell Discharge Curve 43...

Страница 50: ...AFM 4 2 Appendix III Autopilot Carrier Board LED Codes LED Color Status Blue Carrier board power is connected Orange GPS is tracking enough satellites for positioning 44...

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