Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 17

Installing and connecting battery 

1. Attach battery to battery tray. Do not use an oversized battery. Maximum installation dimension is 80mm X 

120mm X 200mm.

2. Connect the black connector and then the red connector to power on. Disconnect the red connector then 

black connector to power off.

Connectors are soldered

Installing Battery
18 © 2014 DJI. All Rights Reserved. 

Setting Up the Landing Gear

Using a 2-position RC transmitter switch, landing gear retraction can be carried out remotely.

Setting up the transmitter

Select a 2-position switch (default setting is OK) as the control input for the landing gear. Ensure the 

corresponding receiver port is connected to the “IN” port on control board. For the A2 flight control 

system, connect the flight controller’s F1 port to “IN” port on control board.

Upper: Toggle the switch to this position to raise the landing gear.

Lower: Toggle the switch to this position to lower the landing gear.

If the transmitter switch has a FailSafe function, set the FailSafe value to the [Lower] position. This 

ensures that the landing gear will lower automatically when the receiver enters FailSafe mode.

To avoid accidental switch triggering, slide levers or other controls can be used for landing gear 

control.

Usage procedures

1. Ensure transmitter and receiver batteries are fully charged.

2. Toggle the switch to the [Lower] position, and then turn on the transmitter.

3. Ensure the “R”, “L” and “IN” connections are correct.

4. Ensure the landing gear is in the [Lower] position, then power on the system. If a solid green LED on the 

landing gear control board lights up, everything is normal. If it flashes green slowly, re-calibrate the system 

according to instructions in “Recalibrating Servo Travel”.

5. Toggle the switch to the [Upper] position ONLY AFTER takeoff.

6. Toggle the switch to the [Lower] position for landing.

Setting Up the Landing Gear
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 19

Servo power will shut off 3 seconds after the landing gear has reached its target position.

When powering on the system, if the transmitter switch is in the [Upper] position, the LED will flash 

red quickly as a warning. Toggle the switch to the [Lower] position to continue.

If there is an abnormal signal or no signal input into the “IN” port, the LED will slowly flash red. 

Check receiver and connections for problems.

If servo power consumption is too high, the LED will light up red. If this lasts more than 4 seconds, 

the landing gear will lower and the LED will flash green slowly. Re-calibration is needed before 

flying.

A2 flight control system users can use the A2 Assistant to set intelligent gear on the “Advanced” 

page. Refer to the “A2 user manual” for details.

LED Control Board Indicator

System normal — Solid green. 

Calibration required Blinks rapid green. 

Recalibration required Blinks slow green. 

Calibration failed — Solid yellow. 

Enter calibration mode Blinks rapid yellow.

System calibrating Blinks slow yellow.

Motor stalled — Solid red.

Unsafe startup alert Blinks rapid red.

 Input signal abnormal Blinks slow green. 

Landing Gear Specifications

Parameter Range Parameter Range

Working Voltage 3S~6S (LiPo) Input Signal PWM (High-Pulse Width 800us~2200us)

Working Current Max 1A@6S Output Signal PWM (Mid Position is 1520us) in 90Hz

Working Temperature -20~70° C Output Voltage 6V

Total Weight 875g Servo Travel 150° (Minimum 120° )

Setting Up the Landing Gear
20 © 2014 DJI. All Rights Reserved. 

Mounting the Gimbal

Before assembling the gimbal, install the GCU as shown below. Be sure to install on the side as shown below. 

A DJI Z15-GH4 (HD) gimbal has been used as an example in the following diagrams.

The connectors on gimbal should be removed for better performance, then the gimbal can be mounted to 

the lower connection points. Users of DJI Z15-5N / 7N gimbal, refer to the DJI Z15-5N / 7N Gimbal Mounting 

Notes (Page 21) for details.

Mounting the Gimbal
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 21

Check that the system’s center of gravity is on the line as shown in the diagram below. 

Mounting the Gimbal

DJI Z15-5N / 7N Gimbal Mounting Notes

Due to the size restriction of the Z15-5N / 7N gimbal, users should purchase extended landing gear 

legs (used with Z15-5N / 7N gimbal) to avoid damage and/or failure during the self-test. Refer to the 

Part List Package No.34 (Page 31) for details.

Follow the Mounting the Landing Gear (Page 6) instructions to mount extended landing gear legs. 

Then the gimbal can be mounted as shown below.

Package No.34 is for users whose landing gear legs are 300mm. Users whose landing gear legs are 

350mm have no need to purchase this part.
22 © 2014 DJI. All Rights Reserved. 

Appendix

ESC Sound

ESC State Sound

Ready 1234567--B--B

Throttle stick is not at bottom BBBBBB...

Input signal abnormal B-------- B-------- B...

Input voltage abnormal BB--- BB--- BB--- BB...

ESC LED

ESC State LED

Standby Off

Motor rotating Solid Red or Green On

Motor rotating at full throttle position Solid Yellow On

DJI ESCs are specifically designed for multi-rotors. When used with DJI autopilot systems 

parameters and travel ranges do not have to be calibrated. 

Specifications

Frame

Diagonal Wheelbase 900mm

Frame Arm Length 358mm

Frame Arm Weight

(with Motor, ESC, Propeller )

316g

Center Frame Diameter 272mm

Center Frame Weight (with Landing Gear 

Mounting Base, Servos)

1185g

Landing Gear Size 460mm(Length)×450mm(Width)×360mm(Height) 

Motor

Stator Size 41×14mm

KV 400rpm/V

Max Power 500W

Appendix
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 23

Weight (with Cooling Fan) 158g

ESC

Working Current 40A

Working Voltage 6S LiPo

Signal Frequency 30Hz ~ 450Hz

Drive PWM Frequency 8KHz

Weight (with Radiators) 35g

Foldable Propeller (1552/1552R)

Material High strength performance engineered plastics

Size 15×5.2 inch

Weight 13g

Flight Parameters

Takeoff Weight 4.7Kg ~ 8.2Kg

Total Weight 3.3Kg

Power Battery LiPo (6S,10000mAh~15000mAh,15C(Min))

Max Power Consumption 3000W

Hovering Power Consumption 1000W (@6.8Kg Takeoff Weight)

Hovering Time 18min (@12000mAh & 6.8Kg Takeoff Weight)

Working Environment Temperature -10° C ~ 40° C

Gain Value Settings

Flight Control

Basic Attitude

Pitch Roll Yaw Pitch Roll Vertical

A2 110% 110% 120% 220% 220% 120%

WooKong-M 160% 160% 160% 190% 190% 100%

Appendix
24 © 2014 DJI. All Rights Reserved. 

Remounting the Propellers

Instructions

1. Use two M3×12.3 screws and four washers to remount propellers.

2. Apply thread locker to the thread of the propellers mount first.

3. Affix screws with 4Kg ∙ cm (0.4N ∙ m) torque.

Refer to original screw tensions if you are unfamiliar with torque measurements. Applying thread 

locker to the propeller mount first avoids getting thread locker into the holes of the plastic propeller.

Loose screws cannot be securely locked with thread locker.

G V G P

G V G P

Red

Black

Blue

Thick wire

Solder pad

Blue

Black

Red

Fine wire

Fine wire

Thick wire

CCW arms CW arms

Propeller Precautions

Torque markers on the screws and propeller covers will give you a visual cue to check whether the propellers 

are loose. Check the torque markers before every flight.

FAQ

Soldering the ESC

Be sure to solder the thick wires and fine wires correctly when soldering an ESC to the frame arm.

Clockwise (CW) and counter clockwise (CCW) motors have a different arrangement of the colored wires.

FAQ
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 25

Using the Propeller Holder 

Instructions

1. Insert the propeller blades into the propeller holder. 2. Attach the propeller holder to the frame arm.

Assembling Motor Vibration Absorbers 

A soft damper is part of the vibration absorber. Assemble soft dampers as shown below. Assembly is the 

same for CCW and CW propellers. 

Ensure all soft dampers and vibration absorbers are in good condition before every flight. If not, 

replace immediately. Otherwise, the flight performance of your aircraft will be adversely affected.

Before installing the soft dampers, put the copper gaskets onto the four mounting holes on the 

carbon plate. Then put the soft dampers into the mounting holes.

After tightening the screws, the vibration absorbers may be twisted. If this is the case, hold the 

motor with your thumbs under the base plate and fingers on the top carbon plate, and squeeze the 

plates together to make the vibration absorbers flat and parallel with the plates.

FAQ
Spreading Wings S900 User Manual

26 © 2014 DJI. All Rights Reserved. 

Remounting the Landing Gear Servo 

Remounting servos is not recommended as they are pre-installed. 

Instructions

1. Connect the left servo cable to the “L” port of the landing gear control board.

2. Connect the right servo cable to the “R” port of the landing gear control board.

3. Press and hold the SET button using a pin then power on. You will see a yellow LED beside the SET button 

flashing quickly. Wait as servos complete position initialization.

4. Make sure the arm connecting to the servo is parallel to the link as shown in the following diagram.

5. Assemble the left and right servos to the left (between M3, M4) and the right (between M5, M6) parts of the 

landing gear. Power off.

Recalibrating Servo Travel 

Instructions

1. Keep your hands away from all moving parts.

2. Ensure the “R”, “L” and “IN” connections are correct.

3. Keep the whole aircraft off of the ground during calibration, as landing gear will move.

4. Press and hold the SET button using a pin while powering on, then release. An LED will flash yellow 

quickly. Press the SET button again. Auto calibration will begin and the LED will flash yellow slowly. DO 

NOT obstruct any moving parts during auto calibration.

5. During calibration, the left landing gear will raise and lower, followed by the right landing gear. 

6. After calibration, both the left and right landing gears will be lowered and the LED will display a solid green 

light. This indicates that the landing gear is working properly.

If the LED is solid yellow after calibration, a problem has occurred. Carry out the instructions in 

“Remounting the Landing Gear Servo” then try again.

Avoid obstructions during calibration. If the landing gear was obstructed, recalibration will be 

required, per the above steps.

If the “R” and “L” servo cables are reversed, travel will not be measured correctly. Fix the 

connections and recalibrate the landing gear using the above steps.

Landing gear travel has been pre-calibrated. Mechanical adjustment of the gear travel is not 

recommended.

After Installation

Servo

Connecting arm

Link

R L IN

To left servo

To receiver channel

(To F1 port if use A2)

SET Button

LED

To right servo
© 2014 DJI. All Rights Reserved. 27

Package No.

Package Part No.

CW as clockwise CCW as counter clock

wise B as Balck R as Red G as Green

01-Frame Arm 02-Center Frame;

;

; ; ;

;

03-Landing Gear

S900

S9020101CCW

Part List

If you require a replacement part, locate the part that you wish to replace in the following tables. Then order 

the package that comes with the specified part. The numbering of the part is defined as follow:

S9012501CCW/

S9012502CW

M3x12.3 (hexagan)

S9012101B/

S9012201R

S9010801/

S9013501

S9011001

S9012901/

S9013001/

S9013101/

S9013201

S9012301R/

S9012401G

M3x10.3

S9010401CCWB/

S9010501CCWR/

S9010601CWB/

S9010701CWR

S9012302/

S9012402

M3x12.3 (cheese)

S9012503

S9010404/

S9010504/

S9010604/

S9010704

S9010403/

S9010503/

S9010603/

S9010703

S9010402/

S9010502/

S9010602/

S9010702

S9010802

M3x4.5

S9012902/

S9013002/

S9013102/

S9013202

S9012903/

S9013003/

S9013103/

S9013203

S9012102B/

S9012202R/

S9013701R/

S9013801B

Frame Arm

Package No. Name Part No.

4 S900 Frame Arm CCW - Black S9010401CCWB, S9010402, S9010403, 

S9010404, M3×12.3 (cheese)

5 S900 Frame Arm CCW - Red S9010501CCWR, S9010502, S9010503, 

S9010504, M3×12.3 (cheese)

6 S900 Frame Arm CW - Black S9010601CWB, S9010602, S9010603, 

S9010604, M3×12.3 (cheese)

7 S900 Frame Arm CW - Red S9010701CWR, S9010702, S9010703, 

S9010704, M3×12.3 (cheese)

8 S900 Motor Damping Unit S9010801, S9010802, M3×10.3

10 S900 Motor Mount Carbon Board S9011001, M3×4.5

Part List
Spreading Wings S900 User Manual

28 © 2014 DJI. All Rights Reserved. 

21 S900 4114 Motor with black Prop cover S9012101B, S9012102B, M3×4.5

22 S900 4114 Motor with red Prop cover S9012201R, S9012202R, M3×4.5

23 S900 ESC with Red LED S9012301R, S9012302, M3×12.3 

(cheese)

24 S900 ESC with Green LED S9012401G, S9012402, M3×12.3 

(cheese)

25 S900 Propeller Pack S9012501CCW, S9012502CW, 

S9012503, M3×12.3 (hexagan)

S9020301

S9020302

S9020901 M3x8 (self-tapping) 

M3x6.5

S9021201L

S9021202R

S9021203/

S9021101

S9021501

S9021502

M2.5x8 (cheese)

M3x6.5

S9021401

S9021503/

S9032703

M2.5x8 (cheese)

Center Frame

Part List
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 29

Package No. Name Part No.

3 S900 Lock Knob S9020301, S9020302, M3×8 (self-tapping)

9 S900 Center Frame Support Pillar S9020901, M2.5×8 (cheese)

12 S900 Arm Mounting Bracket S9021201L, S9021202R, S9021203, 

M3×6.5

14 S900 Center Frame Bottom Board S9021401, M3×4.5 (cheese), M3×8 (selftapping), M3×6.5, M3×5.5

15 S900 Center Frame Top Board S9021501, S9021502, S9021503, M3×6.5, 

M2.5×8 (cheese)

11 S900 Frame Arm Mounting Steel Shaft S9021101

Landing Gear

S9031601/

S9033304

S9031603/

S9033305

S9031602/

S9033303

S9031604/

S9033306

S9031605/

S9033307

S9033301

S9033302

M2.5x5

S9031802

S9031803

S9031804

S9031805

M2.5x8(cheese)

S9031806

S9031807

M3x8

S9031808

S9031809

M1.6x5

S9031810

S9031811

S9031812

S9031814

S9031815

S9031801

S9031712

S9031701

M2.5x10 (socket cap)

M2.5x13

M3x6.5

S9031903

S9031904

S9031905

M3x4.5

M3x6.5

M3x6.8

S9031902

S9031901

S9032001

S9032002

M2.5x8 (socket cap)

M2.5x8 (cheese)

S9032601

S9032602

S9032603

S9032606

M3x22 (socket cap)

S9032604

S9032605

M2.5x8 (socket cap)

S9030201

S9033313

S9033308

S9033309

S9033310

S9033311

S9033312

S9031713/

S9031813

S9033314

Caution (1) Parts within the dotted box are mirrored against each other. 

 Except for S9031814 and S9031815.

(1)

Part List
Spreading Wings S900 User Manual

30 © 2014 DJI. All Rights Reserved. 

S9032701

S9032702

S9013601 S9020201 S9020202

S9020103 S9020104

Package No. Name Part No.

16 S900 Gimbal 

Damping Bracket

S9031601, S9031602, S9031603, S9031604, S9031605, 

M2.5×5, M2.5×13

17 S900 Retractable 

Module (Right)

S9031701, S9031702, S9031703, S9031704, S9031705, 

S9031706, S9031707, S9031708, S9031709, S9031710, 

S9031711, S9031712, S0031713, M1.6×5, M2.5×10 (socket 

cap), M2.5×8 (cheese), M2.5×5, M3×8, M3×4.5, M3×6.8

18 S900 Retractable 

Module (Left)

S9031801, S9031802, S9031803, S9031804, S9031805, 

S9031806, S9031807, S9031808, S9031809, S9031810, 

S9031811, S9031812, S9031813, S9031814, S9031815, 

M1.6×5, M2.5×10 (socket cap), M2.5×8 (cheese), M2.5×5, 

M3×8, M3×4.5, M3×6.8

19 S900 Gimbal 

Damping 

Connecting 

Brackets

S9031901, S9031902, S9031903, S9031904, S9031905, 

M2.5×5, M3×6.5

20 S900 Landing Skid S9032001, S9032002

26 S900 Landing Gear 

Leg

S9032601, S9032602, S9032603, S9032604, S9032605, 

S9032606, M2.5×8 (socket cap), M3×22 (socket cap)

2 S900 Battery Tray S9030201

33 S900 Gimbal 

Mounting 

Accessories

S9033301, S9033302, S9033303, S9033304, S9033305, 

S9033306, S9033307, S9033308, S9033309, S9033310, 

S9033311, S9033312, S9033313, S9033314, M2.5×5, 

M2.5×13, M2.5×8 (cheese)

Miscellaneous 

Part List

S9033401

Caution: This part is used with Z15-5N / 7N gimbal.
Spreading Wings S900 User Manual

© 2014 DJI. All Rights Reserved. 31

Package No. Name Part No.

13 S900 Center Frame Package 3, 9, 12, 14, 15

29 S900 Complete Arm [CW-RED] Package 7, 8, 10, 11, 22, 23, 25, S9012901, 

S9012902, S9012903

30 S900 Complete Arm [CW-Green] Package 6, 8, 10, 11, 21, 24, 25, S9013001, 

S9013002, S9013003

31 S900 Complete Arm [CCW-RED] Package 5, 8, 10, 11, 22, 23, 25, S9013101, 

S9013102, S9013103

32 S900 Complete Arm [CCW-Green] Package 4, 8, 10, 11, 21, 24, 25, S9013201, 

S9013202, S9013203

27 S900 GPS Holder S9032701, S9032702, S9032703, M2.5×8 (cheese)

28 S900 Screw Pack Assorted screws

1 S900 Power Cord Plug S9020101, S9020102, S9020103, S9020104

34 S900 Extended Landing Gear Leg S9033401

35 S900 Rubber Damper for 4114 Motor S9013501, M3×10.3

36 S900 Propeller Holder S9013601

37 S900 4114 Motor-Red Prop Cover S9013701R, M3×12.3 (hexagan)

38 S900 4114 Motor-Black Prop Cover S9013801B, M3×12.3 (hexagan)

FCC Statements

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant 

to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful 

interference when the equipment is operated in a commercial environment. This equipment generates, uses, 

and can radiate radio frequency energy and, if not installed and used in accordance with the instruction 

manual, may cause harmful interference to radio communications. Operation of this equipment in a residential 

area is likely to cause harmful interference in which case the user will be required to correct the interference 

at his own expense.

FCC Statements
User manual is subject to change without prior notice.

http://www.dji.com/product/spreading-wings-s900

You may visit DJI offical website to obtain the latest version of user manual.

© 2014 DJI. All Rights Reserved.