RC-Tek SJM325-C Pro SE User manual

RC-TEK
SJM325-C PRO SE Reference Manual
SJM325-C PRO SE Specifications:
•Airframe Weight (Including Canopy and Main Blades): 505g
•RTF Weight: 775-875g
•Airframe Length (With Canopy): 710mm
•Airframe Width: 120mm
•Airframe Height: 220mm
•Main Blade Disk Diameter: Up to 760mm (Using 330mm Main Blades)
•Flybar Paddle Disk Diameter (RC-TEK Default): 350mm
•Flybar Rod Size (RC-TEK Default): Ø2.5mm x 240mm
•Tail Rotor Disk Diameter: 150mm (Using 58mm Tail Blades)
•Main Shaft Size: Ø6mm x 136mm
•Tail Rotor Shaft Size: Ø3mm x 45mm
•Tail Boom Diameter (External): Ø15mm
•Main Drive Gear: M0.6 125T
•Main/Tail Gear Ratio: 1 : 4.82
•Optional Standard Motor: 2600KV (425w) w/ 13T/14T Pinions
•Optional Upgrade PRO Motor: 3000KV (480w) w/ 12T/13T Pinions
•Optional PRO ESC: SJM40A 2~4S (55A Burst) w/ 3A (5A Burst) BEC
Specifications subject to change without notice or obligation
1
CONTENTS
1. Important Notes
2. Assembly Drawings
Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

2
RC-TEK
SJM325-C PRO SE Reference Manual
Thank you for your purchase of the innovative SJM325. In order to ensure proper operation of this high performance helicopter in a safe manner, please read
this reference manual completely before attempting to fly to the SJM325. Additionally, please observe all flying rules and flight precautions while fully
understanding the capabilities and limits of the SJM325. Be sure to retain this manual for future reference, routine maintenance, and tuning.
Assembly Tip: Use CA or loctite (#242) on all important screws throughout the SJM325 before fastening each screw.
Important Notes:
•The helicopter is recommended for skilled intermediate to advanced RC helicopter flyers.
•Make sure to read and follow all the instructions in this manual, including all accessories.
•Should any uncertainty arise, please consult with an experienced RC helicopter hobbyist and/or instructor BEFORE any attempt is made to fly this
helicopter.
•Always find an experienced and qualified secondary party to assist pre-flight inspection.
•Make sure the proposed flight vicinity is in an open space; free of crowds, obstacles, and buildings. Failure to abide may cause accidental and
potentially hazardous encounters.
•Any introductory flight should incorporate only basic maneuvers (hovering, linear ascending, and descending) until the stick feel is mastered.
•Do not operate the stock SJM325 325mm plastic blades above 3100RPM and/or the RC-TEK 325mm fiberglass main blades above
3300RPM.
Precautions:
•Fly only in safe areas, away from other people. Do not operate RC helicopters within the vicinity of homes or crowds of people. RC helicopters are
prone to accidents, failures, and crashes due to a variety of reasons including, lack of maintenance, pilot error, and radio interference. Pilots are
responsible for their actions and damage or injury occurring during the operation or as of a result of RC helicopter models.
Recommended Equipment NOT included in the SJM325 base kit:
•Radio Control System – 6 channels or more CCPM helicopter compatible transmitter or equivalent
•Receiver – 6 channels or more
•Gyro – RC-TEK 700/800 series, Futaba GY401, Logictech2100T
•Servos – (4) Servos – Hitec HS-81/85, Futaba S9650/S9257 or equivalent
•Battery – (1) 3S1P 1800mA+ Li-Po Battery (2200mA 25C or more recommended)
Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

3
RC-TEK
SJM325-C PRO SE Reference Manual
Pre Flight Checks:
1. As a precautionary avoidance to frequency interference (two different helicopters utilizing the same frequency), it is important to keep the remote
controllers and helicopters apart for at least a distance of 0.5 miles. In order to prevent accidental encounters from occurring; please make sure the
surrounding areas (the flight area) are not populated with crowds and/or buildings (look for open space). Any open space vicinity should be at least 100 feet
in all directions.
2. Make sure the battery is completely charged. Read carefully the suggested charging time and maintenance procedures listed in the instruction manual.
Attempted flight without a fully charged battery will result in an unexpected loss of power, directional control, and/or costly accidental crashes. Remember,
by NOT discharging the battery completely during usage, you will maintain its efficiency and increase its life span.
3. You are now ready to turn ON both the transmitter (remote control) and the receiver (located on the helicopter). Make sure the helicopter is placed on a
flat leveled surface on the ground before commencing. Always turn on the transmitter (remote control) FIRST before turning on the receiver.
4. Test and confirm the directional controls are working properly. Try moving the directional stick and study the resulting effects of the helicopter. If no
resulting movement is noticed when moving the directional stick, do not attempt flight as either the helicopter or the remote control may be defective.
5. Before any test flight, it is recommended to tie the helicopter to a fixed restraint mechanism under safe conditions and then gradually increase its power;
making sure the helicopter can perform various movements until at least one battery is depleted in order to confirm all parts fit properly. When finished,
carefully check the entire helicopter over to see if there are any loose parts and/or screws and make adjustments as needed.
The following guidelines list the most recommended methods for a beginner to commence their journeys into the remote control flying realm (listed in the
order of importance):
1. Find an experienced Instructor – most likely can be found at your local hobby store.
2. Join a RC club in your nearby area – can be found through the internet, hobby stores, parks, and friends (word of mouth).
3. Make sure you are standing directly behind the helicopter before any attempted flight.
4. Slowly introduce power to the helicopter in a continuous and stable pace.
5. Analyze carefully the characteristics of the helicopter. As more power is introduced, the helicopter will begin its ascension progress. Make directional
adjustments to counter and insure a linear ascending or descending path.
6. Make sure never to exceed a flying height of over 3 feet! Anything over the recommended height can and may cause major damage to the helicopter
if crashed.
Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

4
RC-TEK
SJM325-C PRO SE Reference Manual
7. Upon reaching the recommended maximum height, slowly release and let off on the throttle till landing. Always maintain the helicopter’s plane level
to the ground.
8. Continually practice this technique until you can masterfully perform linear ascending and descending paths, as well as stationary hovering
capabilities.
9. As your skills improve, slowly introduce lateral movements to the helicopter; with your starting point of spot as the final goal (position). Make sure to
keep the lateral distances within a 3 feet diameter. Furthering the recommended distance will increase accidental encounters.
10. Once these techniques are mastered, you are now ready to elevate both your helicopter and flying skills to its potential.
11. It’s strongly recommended for softened landings, slightly tilt and allow the front part of the landing strut to touch down, followed by the rear half.
Notes:
The majority of crashes experienced by beginners are associated with behaviors of nervousness and/or panic. Only a small percentage is directly related to
mechanical failures. Repetitive practice is the only way to enhance your skills such as developing controls sensitivity, awareness, and understanding. Regular
maintenance is required to keep the SJM325 helicopter in optimal and safe flying condition. This helicopter requires precise configuration of the components
and settings to be kept by the owner. Conduct regular maintenance on the SJM325 to avoid accidents or loss, and to ensure optimal performance.
Main Rotor Checklist:
1. Main rotor housing: When the main rotor housing is worn or faulty, there will be obvious vibration and poor flight control. Check the main rotor, main
shaft, and feathering shaft for wear or deformity. Replace parts as necessary to eliminate imbalance.
2. O-rings (not used on the SJM325): The O-rings will lose their elasticity over time. This will cause excess play on rotor and cause instability. Replace
as needed.
3. Main rotor hub: If the helicopter will not fly or begins to reacts sluggishly, even after checking for proper setting of pitch and throttle, check the
following items:
•Blade grip Bearings
•Swing arm/control arm bearings
•Rotor blades
•Other relevant moving parts
4. Check for excess play or gaps between the surfaces, missing or broken parts, or binding restricting free movement. It is very important to check for
main rotor balance before each flight. Operating the helicopter “out of balance” will cause excessive wear and premature failure of parts, possibly
resulting in a dangerous situation.
Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

5
RC-TEK
SJM325-C PRO SE Reference Manual
5. Control arm assembly: Check regularly for cracked, worn, bent or binding control arms and pushrods. Smooth movement of control arms and
linkages is required for stable, vibration free flight.
6. Swash-plate: Check for excess slop in the main ball that the main shaft rides on and slop or looseness among all the metal parts. Swash-plate wear
will result in poor stability and lack of control during flight. Replace as necessary.
Fuselage/Chassis:
1. Main shaft bearing: The normal replacement interval for proper operation is between 60-100 flights. If performing 3D or other extreme aerobatics,
inspect the bearing more frequently and shorten the interval as necessary.
2. One-way bearing: One-way bearings have longer lifetimes and failure is not common. To keep the one-way bearing in good operation, remove it to
clean and lubricate after every 50 flights. If the main drive gear is loose, you should replace the one-way bearing.
3. Drive belt: SJMRC/RC-TEK uses only top quality, stretch-resistant belts. It is however, impossible to prevent the belt from stretching or wearing out.
Check belt tension regularly, and check for the wear on the teeth. Replace as necessary.
Linkage Rods and Connecting Parts:
During assembly, take special care to keep the connecting parts in smooth operation, and avoid excess play or binding. Failure to do so will result in poor
flight stability. The linkage rods and ends will break and wear due to normal usage, crashing, and poor maintenance. Check for wear and proper operation
regularly and replace as needed.
Tail Rotor System:
1. Tail rotor control set: Check the tail rotor bearing regularly. If there is excess play or gaps, replace immediately. Avoid any binding or improper
contact on the tail components and bearings as this will cause excessive wear and heat, potentially melting and/or deforming the tail system.
2. Tail unit assembly: Avoid flying in tall grass or weeds. If grass or weeds become lodged in the tail rotor unit, it may interfere with the operation, and
cause the helicopter to lose control. Always check for foreign objects in the tail and clean them off immediately. Avoid using lubricants on the
exposed surfaces of the SJM325 as it will attract and collect dirt and debris and potentially cause hardware failure.
Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

6
RC-TEK
SJM325-C PRO SE Reference Manual
3. Tail rotor housing: Disassemble the tail rotor housing for cleaning and maintenance after every 50 flights. If the tail does not operate smoothly or
exhibits any signs of stress or wear, it should be replaced immediately.
4. Tail rotor: Check the tail rotor blades regularly for damage, especially if the helicopter ever strikes the ground while flying or after any hard landings.
Damaged tail blades can induce vibration.
Closing Reminder:
Maintaining and taking care of your SJM325 on a regular basis will result in the helicopter providing you with safe and enjoyable flying experiences for years
to come.
RC-TEK, Ltd.
www.rc-tek.com
www.sjmrc.us
World Wide Sales and Support:
[email protected]
[email protected]
Worldwide Headquarters:
848 N. Rainbow Blvd., Suite 1089
Las Vegas, NV 89107 USA
Tel: [phone]
Fax: [phone]
ENJOY YOUR NEW SJM325!
RM-REVA070208 SGBE Copyright © 2008 RC-TEK/SGB Enterprises LLC. All Rights Reserved.

7
SAFETY WARNING
1. This RC helicopter is NOT a toy. This helicopter generates large amounts of force and can fly at
high rates of speed. Always operate this helicopter under the guidance of someone experienced
in R/C aerial flight.
2. Always fly under safe weather and environmental conditions.
3. After initially applying electrical power to the helicopter, the unit might vibrate strongly or out of
control due to nearby electrical magnetic interference (EMI) or other radio interference fields
(RFI) caused by various consumer appliances and other remote control transmitters. Therefore,
it is recommended to keep a safe distance from these types of environments whenever possible.
Be alert to harmful interference at ALL times.
4. The technology used in today’s helicopter batteries might explode and/or cause a fire in the case
of a short circuit initiated by moisture, heat, or blunt physical force. Treat all batteries with care
and safety in mind.
5. This helicopter frame structure has a maximum revolving blade speed rating of 3300 RPM. DO
NOT attempt to operate this helicopter above this maximum RPM or damage and potential human
injury may occur.
6. It is recommended to check and renew the main rotor blades frequently as the leading edge
areas will degrade and operate less efficiently after moderate use.
7. Condition all electrical batteries according to industry guidelines in order to reduce the risk of
electrical dangers.
8. The operator of this helicopter is ultimately responsible for his/her own actions and any/all
potential damaged caused either directly or indirectly as a result of such operation. RC-TEK Ltd.,
its agents and/or subsidiaries shall be held harmless for any financial, physical, or emotional loss
caused by the operation of this helicopter. Please contact [email protected] if you have any
questions relating to this clause.

1
No. Part No. Discription Q'T
Y
Specification No. Part No. Discription Q'TY Specification
1 AL6016 Sliding shaft set 1 3 SJ80001 Tail sliding shaft screw 1 M1.6×10mm
2 SJ50006 Tail angel adjusting ball link 2 H16 4 SJ80001 Tail sliding shaft screw 1 M1.6×10mm

2
No. Part No. Discription Q'TY Specification No. Part No. Discription Q'TY Specification
5 SJ20005 Cap Screw 2 M2×10mm 11 CF6040 Tail blade 2
6 SJ10010 Bearing 4 Ø2×Ø6×2.5mm 12 SJ20006 Cap screw 2 M2×16mm
7 AL6019 Tail blade clincher 2 13 AL6041 Tail blade clincher balance board 4 Ø2×Ø1.5×9.5mm
8 AL5020 Tail blade Center 1 14 AL6041 Tail blade clincher balance board 4 Ø2×Ø1.5×9.5mm
9 SJ30005 Countersunk screw 2 M2×8mm 15 SJ70001 Nut 2 M2
10 AL5048 Linkage ball 2

3

4
No. Part No. Discription Q'TY Specification No. Part No. Discription Q'TY Specification
16 AL5017X Tail unit housing 1 28 CF5003 Tail unit housing side board 1
17 SJ20003 Cap screw 1 M2×5mm 29 SJ20003 Cap screw 1 M2×5mm
18 CF5003 CF tail unit housing side board 1 30 SJ20019 Cap screw 1 M2×20mm
19 CF5003 CF tail unit housing side board underlay stick 1
Ø
2×Ø4.5×13m
m
31 SJ70001 Nut 1 M2
20 SJ10015 Frange bearing 1 Ø3×Ø7×3mm 32 SJ20004 Cap screw 2 M2×8mm
21 CL5001 Underlay 1 Ø3 33 CF6011X CF vertical parallel blade 1
22 CL5001 Tail shaft belt gear 1 34 CF6011X CF vertical parallel blade underlay stick 2 Ø2×Ø3.5×4mm
23 HS5003P Tail shaft 1 Ø3×45mm 35 SJ20012 Cap screw 2 M2×4mm
24 DB6001P Belt 1 378mm 36 AL6036P Underlay 2 Ø2.5
25 CF6013X CF tail boom 1 37 SJ50004 Ball link 1 H20
26 CL5001 Underlay 1 Ø3 38 SJ20003 Cap screw 1 M2×5mm
27 SJ10015 Frange bearing 1 Ø3×Ø7×3mm

5
No. Part No. Discription Q'TY Specification No. Part No. Discription Q'TY Specification
39 SJ20009 Set screw 2 M3×3mm 45 SJ20005 Cap screw 2 M2×10mm
40 SJ20009 Set screw 2 M3×3mm 46 AL6036P Underlay 2 Ø2
41 AL5015 Tail angel adjusting set 1 47 SJ20004 Cap screw 1 M2×8mm
42 SJ20004 Cap screw 1 M2×8mm 48 AL5048 Linkage ball 1
43 SJ20019 Cap screw 1 M2×20mm 49 SJ40001 Round head Screw 2 M1.6×6mm
44 SJ10010 Bearing 4 Ø2×Ø6×2.5mm

6

7
NO. Part NO. Discription Q'TY Specification NO. Part NO. Discription Q'TY Specification
50 SJ20003 Cap screw 2 M2×5mm 59 SJ20004 Cap screw 1 M2×8mm
51 SJ10010 Bearing 2 Ø2×Ø6×2.5mm 60 SJ20004 Cap screw 1 M2×8mm
52 AL6036P Underlay 2 Ø2 61 SJ20004 Cap screw 1 M2×8mm
53 SJ40001 Roundhead screw 2 M1.6×6mm 62 SJ30005 Countersunk screw 1 M2×8mm
54 AL6023 Connecting rod set 1 63 AL5048 Linkage ball 1
55 AL6022 Tail boom support 1 64 SJ70001 Nut 1 M2
56 AL6021 Tail servo mount 1 65 SJ20004 Cap screw 4 M2×8mm
57 AL6021 Tail servo mount 1 66 AL6036P Underlay 4 Ø2.5
58 SJ20004 Cap screw 1 M2×8mm 67 CF2002P Tail servo link 1 Ø2×325mm

8

NO. part No Discription Q'TY Specification No part No Discription Q'TY Specification
68 AL6011 Flybar stand 1 72 SJ30005 Countersunk screw 2 M2×8mm
69 AL6012P Flybar copper ball 1 73 AL5048 Ball link 2
70 HS6001X Flybar rod 1 Ø25×240mm 74 AL6012P Flybar copper ball underlay sticke
r
2
71 SJ20009 Set screw 2 M3×3mm 75 SJ20009 Set screw 3 M3×3mm
9

NO. part No Discription Q'TY Specification No part No Discription Q'TY Specification
76 SJ50004 Ball link 2 81 CF6039 Flybar paddle 2
77 HS6005P Lingkage rod 2 Ø2×10mm 82 SJ50005 Ball link 2
78 AL5004
F
lybar mixing arm set subassembl
y
2 83 HS6005P Linkage rod 2 Ø2×32mm
79 AL6044 Flybar linkage ball 2 84 SJ50005 Ball link 2
80 SJ20009 Set screw 8 M3×3mm
10

NO. part No Discription Q'TY Specification No part No Discription Q'TY Specification
85 AL5004 Flybar mixing arm set subassembly 2 96 SJ40001 Roundhead screw 2 M1.6×6mm
86 SJ20005 Cap screw 2 M2×10mm 97 AL6008P Main blade clincher arm 2
87 SJ10010 Bearing 4 Ø2×Ø6×2.5mm 98 SJ20005 Cap screw 2 M2×10mm
88 AL6036P Underlay 2 Ø2 99 HS6003 Feathering shaft 2 Ø4×26mm
89 AL6013P Mixing arm 2 100 SJ10017 Trust bearing 2
90 SJ40001 Roundhead screw 2 M1.6×6mm 101 AL6007 Main blade clincher 2
91 HS6005P Linkage rod 2 Ø2×8mm 102 SJ10003 Bearing 2 Ø4×Ø7×2.5mm
92 SJ50005 Ball link 2 103 AL6007 Main blade clincher underlay stick 2
93 SJ30006 Countersunk screw 2 M2×10mm 104 SJ10003 Bearing 2 Ø4×Ø7×2.5mm
94 SJ10010 Bearing 4 Ø2×Ø6×2.5mm 105 AL6010P Main blade clincher 1
95 AL6009P Main blade clincher link 2 106 SJ20011 Cap screw 2 M2×12mm
107 HS1002P Main shaft 1 Ø6×136mm
108 SJ20004 Cap screw 1 M2×8mm
109 SJ70001 Nut 1 M2
110 SJ20005 Cap screw 2 M2×10mm
111 SJ70001 Nut 2 M2
11

NO. part No Discription Q'TY Specification No part No Discription Q'TY Specification
112 SJ20005 Cap screw 2 M2×10mm 114 AL6036P Underlay 2 Ø2
113 SJ10010 Bearing 4 Ø2×Ø6×2.5mm
12

NO. part No Discription Q'TY Specification No part No Discription Q'TY Specification
115 AL6014P Swash plate 1 119 AL5048 Linkage ball 3
116 SJ50004 Ball link 3 119 SJ30005 Countersunk screw 3 M2×8mm
117 HS6005P Linkage rod 3 Ø2×20mm 119 SJ70001 Nut 3 M2
118 SJ50004 Ball link 3
13