Spreading Wings S900 User Manual 

Connectors are soldered 

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. 

© 2014 DJL All Rights Reserved. 17 
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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 . 

.. -, 

'rw' l \'9 ' Upper: Toggle the switch to this position to raise the landing gear. 

'--~ 

... -, , (0, \ l ~ • 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. 

18 @ 2014 DJL All Rights Reserved. 
Spreading Wings S900 User Manual 

-~­ ·v· • 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 

Calibration required 

Recalibration required 

Calibration failed 

Enter calibration mode 

System calibrating 

Motor stalled 

Unsafe startup alert 

Input signal abnormal 

Landing Gear Specifications 

Parameter Range 

Working Voltage 3S-6S (LiPo) 

Working Current Max 1A@6S 

Working Temperature -20-70° c 

Total Weight 875g 

-@:-Solid green. 

~ ...... Blinks rapid green. 

······ Blinks slow green. 

-w- Solid yellow. 

-W ...... Blinks rapid yellow. 

-w ······Blinks slow yellow. 

-@ -Solid red. 

-:®: ...... Blinks rapid red. 

-@ ...... Blinks slow green. 

Parameter Range 

Input Signal PWM (High-Pulse Width 800us-2200us) 

Output Signal PWM (Mid Position is 1520us) in 90Hz 

Output Voltage 6V 

Servo Travel 150° (Minimum 120°) 

© 2014 DJI. All Rights Reserved. 19 
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. 

20 @ 2014 DJL All Rights Reserved. 
Spreading Wings S900 User Manual 

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

DJI Z15-5N 17N Gimbal Mounting Notes 

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

legs (used with Z15-5N I 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. 

© 2014 DJI. All Rights Reserved. 21 
Appendix 

ESC Sound 

ESC State 

Ready 

Throttle stick is not at bottom 

Input signal abnormal 

Input voltage abnormal 

ESC LED 

ESC State 

Standby 

Motor rotating 

Motor rotating at full throttle position 

Sound 

11234567 --8-B 

BBBBBB ... 

B--------8-----.. -B ... 

BB--- BB--- BB--- BB ... 

LED 

Off 

Solid Red or Green On 

Solid Yellow On 

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

-6" parameters and travel ranges do not have to be calibrated. 

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Specifications 

Frame 

Diagonal Wheelbase 900mm 

Frame Arm Length 358mm 

Frame Arm Weight 316g 

(with Motor, ESC, Propeller) 

Center Frame Diameter 272mm 

Center Frame Weight (with Landing Gear 1185g 

Mounting Base, Servos) 

Landing Gear Size 

Motor 

Stator Size 

KV 

Max Power 

22 © 2014 DJI. All Rights Reserved. 

460mm(Length)x450mm(Width )x360mm(Height) 

41x14mm 

400rpmN 

500W 
Weight (with Cooling Fan) 

ESC 

Working Current 

Working Voltage 

Signal Frequency 

Drive PWM Frequency 

Weight (with Radiators) 

Foldable Propeller (155211552R) 

Material 

Size 

Weight 

Flight Parameters 

Takeoff Weight 

Total Weight 

Power Battery 

Max Power Consumption 

Hovering Power Consumption 

Hovering Time 

Working Environment Temperature 

Gain Value Settings 

Flight Control 

A2. 

WooKong-M 

Pitch 

110% 

160% 

Basic 

Roll 

110% 

160% 

Spreading Wings S900 User Manual 

158g 

40A 

6S LiPo 

30Hz- 450Hz 

8KHz 

35g 

High strength performance engineered plastics 

15x5.2 inch 

13g 

4.7Kg- 8.2Kg 

3.3Kg 

LiPo (6S, 10000mAh-15000mAh, 15C(Min)) 

3000W 

1000W (@6.8Kg Takeoff Weight) 

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

-100C-400C 

Yaw 

120% 

160% 

Pitch 

220% 

190% 

Attitude 

Roll 

220% 

190% 

Vertical 

120% 

100% 

© 2014 DJL All Rights Reserved. 23 

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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. 

Red -----------:::~~~ 

Black -------~7"'-:~'"F'><J 

Blue ----=""'-"'~o.r--#---1- 1------"~ 

Thick wire --- ~~~ 

Fine wire ----+-r;~=--~ 

Fine wire ---~~"'--- ~~ 

CCWarms 

Remounting the Propellers 

Instructions 

1. Use two M3x12.3 screws and four washers to remount propellers. 

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

3. Affix screws with 4Kg · em (0.4N · m) torque. 

.-.---J=~M Solder pad .-~~r- Biue 

11-lf---1-it'~lt- Black 

.-e...._-+*-~ Red 

CWarms 

~\): 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. 

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. 

24 © 2014 DJI. All Rights Reserved. 
X Using the Propeller Holder 

Instructions 

1. Insert the propeller blades into the propeller holder. 

Assembling Motor Vibration Absorbers 

Spreading Wings S900 User Manual 

2. Attach the propeller holder to the frame arm. 

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. 

© 2014 DJL All Rights Reserved. 25 
Spreading Wings S900 User Manual 

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. 

To racaivar channel 

(To Fl port if use A2) 

SET Button 

LED 

Recalibrating Servo Travel 

Instructions 

1. Keep your hands away from all moving parts. 

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

Servo --r---liBIConnecting arm --r----""""" ----'1\l ~~ ~ 

Link 

After Installation 

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. 

26 © 2014 DJI. All Rights Reserved. 
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: 

§202Q1Q1CCW CWasclockwise; CCWascounterclock 

5900----' JTT----c wise; BasBalck; RasRed; GasGreen 

01-Frame Arm; 02-Center Frame; - L_ Package Part No. 

03-Landing Gear Package No. 

Frame Arm 

590121028/ 

S9012202RI 

M3x12.3 (hexagan) 

~ 

!! ------------ 59013701 Rl 

~ 

590138018 

"" 59012503 

59012501CCW/ ~ ~ ~======= 59012502CW ~ 

590121018/ ----------~ 

59012201R 

~ 1 ~1 M3x10_3 

59010801/------------~ 590129031 

59013501 l9l l9l ~ 590130031 

8 ---- 590131031 

59010802 ----------- · 59013203 

59011001 ---------------c~ 59010401CCW8/ 59010402/ 

590104031 59010501CCWRI 59010502/ 590105031 

M3x4.5 --------------~> 

llJ. ~ 59010601CW8/ 59010602/ 890106031 S9010701CWR 59010702 89010703 

S9012902/ 

890130021 

590131021 

89013202 

S9012901/ 

89013001/ 

59013101/ 

89013201 

----------~~ sr---- ~--~, 1 ~ ~ ~~ ~ 

~ 590123021 --59010404/ s 8------------- 59012402 89010504/ 

~ 

00 59010604/ 

89010704 

59012301RI ________ ____/ 

a a a a M3x12_3 (cheese) 

S9012401G 

Package No. Name 

4 8900 Frame Arm CCW - Black 

5 

6 

7 

8 

10 

8900 Frame Arm CCW - Red 

8900 Frame Arm CVV - Black 

8900 Frame Arm CVV - Red 

8900 Motor Damping Unit 

8900 Motor Mount Carbon Board 

Part No. 

89010401CCWB, 89010402,89010403, 

89010404, M3x12.3 (cheese) 

89010501CCWR, 89010502,89010503, 

89010504, M3x12.3 (cheese) 

89010601CVVB,89010602,89010603, 

89010604, M3x12.3 (cheese) 

89010701CVVR,89010702,89010703, 

89010704, M3x12.3 (cheese) 

89010801, 89010802, M3x10.3 

89011001, M3x4.5 

© 2014 DJL All Rights Reserved. 27 
Spreading Wings S900 User Manual 

21 

22 

23 

24 

25 

Center Frame 

59020301 

S900 4114 Motor with black Prop cover S90121 01 B, S90121 028, M3x4.5 

S900 4114 Motor with red Prop cover 

S900 ESC with Red LED 

S900 ESC with Green LED 

S900 Propeller Pack 

If 

rr"IT 

S9012201 R, S9012202R, M3x4.5 

S9012301R, S9012302, M3x12.3 

(cheese) 

S9012401G, S9012402, M3x12.3 

(cheese) 

S9012501CCW, S9012502CW, 

S9012503, M3x12.3 (hexagan) 

M2.5x8 (cheese) ------------1 If 

59021502 -----------,:'~-~~=;: :;;:;; ~~ ~ --= ~~ ~ 

____r====-

----------- 59021503/ 

59032703 

'E! 

M3x6.5 ---------D - F 'ff 'E! 

59021501 ------= -= ~~~ 

- - nn n ll -·---- 59020302 

_______ n __ ;-U il u tin il li n M3x8 <••W~pping) 

~~~ 

L 

59020901 

59021203/ _______ _____/ 

59021101 

59021401 

fr----------M3x6.5 

28 @ 2014 DJL All Rights Reserved. 
Package No. Name 

3 8900 Lock Knob 

9 8900 Center Frame Support Pillar 

12 8900 Arm Mounting Bracket 

14 S900 Center Frame Bottom Board 

15 8900 Center Frame Top Board 

Spreading Wings S900 User Manual 

Part No. 

89020301, 89020302, M3x8 (self-tapping) 

89020901, M2.5x8 (cheese) 

S9021201L,S9021202R,S9021203, 

M3x6.5 

S9021401, M3x4.5 (cheese), M3x8 (selftapping), M3x6.5, M3x5.5 

89021501, 89021502, 89021503, M3x6.5, 

M2.5x8 (cheese) 

11 S900 Frame Arm Mounting Steel Shaft S9021101 

Landing Gear 

M3x4.5 -----------~ 

5~31~2---------~ 

89031814 ---------~ 

89031815

89031901 

89031804J 

M3x6.5

M2.5x13

~ 

~ " 59033306 ~ 

~~g~~~~ l 89033301 ----El' 

59033302 0 Sil. 890316031---- · OJ~~ 

59033305 T. 

59031601/ / ! •. 

89031605/ 590333~ ~ 59033307 

M2.5x5 

M2.5x8 (ctleese) 

59033308 __ _____/ 

59033309 __ _____/ 

59033310 --------/ 

59033311 _____ ___/ 

59033312 __ _____/ 

590317131--___/ 

59031813 

M2.5x8 (socket cap) 

89032601 -----------/ 

89032602 __ _____/ 

59032603 __ _____/ 

59032606----___/ 

M3x22 (socket cap) ____ __// 

59032604 ------~ 

rn 

~-----------59031812 

~---------59031712 

~----------59031903 

------------M3x6.5 

-----------59031904 

-----------59031905 

'--------------59031801 

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

Except for 59031814 and 59031815. 

© 2014 DJL All Rights Reserved. 29 
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se: 

Spreading Wings S900 User Manual 

Package No. Name Part No. 

16 8900Gimbal 89031601,89031602,89031603,89031604,89031605, 

Damping Bracket M2.5x5, M2.5x13 

17 8900 Retractable S9031701,S9031702,S9031703,S9031704,S9031705, 

Module (Right) S9031706,S9031707,S9031708,S9031709,S9031710, 

89031711, 89031712, 80031713, M1.6x5, M2.5x10 (socket 

cap), M2.5x8 (cheese), M2.5x5, M3x8, M3x4.5, M3x6.8 

18 8900 Retractable 89031801,89031802,89031803,89031804,89031805, 

Module (Left) 89031806,89031807,89031808,89031809,89031810, 

89031811,89031812,89031813,89031814,89031815, 

M1.6x5, M2.5x10 (socket cap), M2.5x8 (cheese), M2.5x5, 

M3x8,M3x4E,M3x6B 

19 8900Gimbal 89031901,89031902,89031903,89031904,89031905, 

Damping M2.5x5, M3x6.5 

Connecting 

Brackets 

20 8900 Landing Skid 89032001,89032002 

26 8900 Landing Gear 89032601,89032602,89032603,89032604,89032605, 

Leg 89032606, M2.5x8 (socket cap), M3x22 (socket cap) 

2 8900 Battery Tray 89030201 

33 8900Gimbal 89033301,89033302,89033303,89033304,89033305, 

Mounting 89033306,89033307,89033308,89033309,89033310, 

Accessories 89033311, 89033312, 89033313, 89033314, M2.5x5, 

M2.5x13, M2.5x8 (cheese) 

Miscellaneous 

S9032701 

D 

59013601 

======J::J;;z201 ~0202 

~ =7 

59020103 59020104 

7 

/ $9033401 

Caution: This part is used with Z15-5N I 7N gimbal. 

30 @ 2014 DJI. All Rights Reserved. 
Package No. Name 

13 8900 Center Frame 

29 8900 Complete Arm [CW-RED] 

30 8900 Complete Arm [CW-Green] 

31 8900 Complete Arm [CCW-RED] 

32 8900 Complete Arm [CCW-Green] 

27 8900 GP8 Holder 

28 8900 Screw Pack 

1 8900 Power Cord Plug 

34 8900 Extended Landing Gear Leg 

35 8900 Rubber Damper for 4114 Motor 

36 S900 Propeller Holder 

37 8900 4114 Motor-Red Prop Cover 

38 8900 4114 Motor-Black Prop Cover 

FCC Statements 

Spreading Wings S900 User Manual 

Part No. 

Package 3, 9, 12, 14, 15 

Package 7, 8, 1 0, 11, 22, 23, 25, 89012901, 

89012902,89012903 

Package 6, 81 101 11 I 21 I 241 251 89013001 I 

89013002,89013003 

Package 51 81 1 01 11 I 221 231 251 890131 01 I 

89013102,89013103 

Package 41 81 101 11 I 21 I 241 251 89013201 I 

890132021 89013203 

89032701,89032702,89032703, M2.5x8 (cheese) 

Assorted screws 

89020101,89020102,89020103,89020104 

89033401 

89013501, M3x10.3 

89013601 

89013701R, M3x12.3 (hexagan) 

890138018, M3x12.3 (hexagan) 

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. 

© 2014 DJI. All Rights Reserved. 31 

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User manual is subject to change without prior notice. 

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

http :/!www.dji.com/producVspreading-wings-s900 

© 2014 DJI. All Rights Reserved.