ASSEMBLY MANUAL
This photo depicts the rotor head on an assembled model (NEX E6-550 with optional body)
Specications
Compatibility NEX E6 550
Bolt hole dia.
4mm Main rotor dia. 1,145mm ※1
※ 1 With 510mm main blades
P.2
① Any R/C model may crash due to an assembly failure, operational mistake, service failure (loose bolts. etc), interference and so on. Always keep in
mind that a radio control helicopter, which is controlled by radio frequency, may go out of control for many reasons. For safety, the operator should
pay attention to himself/herself and the surrounding area at all times.
② Always read the instruction manual before use.
③ Do not disassemble except for maintenance purposes.
④ Do not modify this product.
⑤ Use parts only within their service specications, if indicated.
⑥ Do not use this product for taking aerial photos or spraying agricultural chemicals.
⑦ Ensure movable parts move smoothly, bolts are tightened, and parts are lubricated and replaced as required.
Thank you for purchasing this JR product.
To experience the full potential of this product, please read and understand this manual before commencing assembly.
PRECAUTIONS
P.3
① The product has been delivered to you after strict inspection. After unpacking the kit, be sure to check its contents. If there are any faulty parts,
contact the seller prior to assembling the product.
② For any pre-assembled item, be sure to check assembly of parts and tightness of bolts and nuts. If an abnormality is noted, please contact the seller.
③ For product faults and failures noticed before completion of assembly, we will replace the relevant parts with new ones only when we have determined
them as a clear incipient failure.
④ Note that our product warranty does not cover any failures of parts which have resulted from your handling during assembly.
⑤ During use of this product, wear, deterioration, service life of parts, and the performance of the helicopter depend greatly on the working
environment at your site (assembly, adjustment, ight condition, storage), and the characteristics of the helicopter dier considerably depending on
these unidentiable factors. As it is virtually impossible for us to have direct involvement with the product under your management, we will take no
responsibility for any product failures which have occurred during use after completion of assembly, and any accidents or losses attributable to them.
⑥ We will take no responsibility when you have used parts other than our original ones or those produced by our authorized optional parts manufacturer,
or for any other problems or accidents resulting from modications.
PRODUCT WARRANTY
LIABILITY INDEMNITY
REPAIR
For repair of this JR product, please consult with your JR helicopter distributor.
The Product, by its nature, includes dangerous elements depending on how it is handled. When ying, operate it at your own risk, paying full heed to the
surrounding persons and objects as well as yourself.
Note that we will take no responsibility for any accidents of whatever cause during use of this product.
P.4
Main rotor head assembly
Socket head bolt M2.6 × 6 ( × 4)
② Install the universal links onto the threaded rod as shown.※ Firstly remove the swash plate and the rotor head.
①
Install the swash plate onto the main shaft and then install the linkage rod.
Install the main rotor head assembly using the socket head bolt M2.6 × 6.
ASSEMBLY STEPS
22mm
Make 3 sets
Universal link ( × 6) Threaded rod M2 × 39 ( × 3)
③ Install the assembled linkage rods.
P.5
Alignment pin supplied with the Kit
Pitch jig rod supplied with the Kit
Tighten with the Socket head bolt supplied with the Kit.
※ If you use the optional JR digital pitch gauge (No.61796), you can make
this adjustment with improved accuracy.
⑤ With the alignment pin inserted and the pitch jig rod installed, adjust the
rod length so each main rotor blade is at 0 ゜pitch.
④ Install the main rotor blades as shown.
Carbon main rotor blades
MB-331 ( × 3)
Main blade bolt M4 × 24 ( × 3)
Nylon lock nut M4 ( × 3)
P.6
● Radio
① Assuming the helicopter was already set up and ying with a 2 blade rotor head, please reverse the direction of the swash mix in your transmitter.
※ This is because with the two blade rotor head on the NEX E6-550, when the swash plate moves up, the blade pitch becomes negative.
But with the MB-331 rotor head, when the swash plate moves up, blade pitch becomes positive.
Also, lower the swash mix pitch value from your previous ight setup.
For example) -50％ → +45％
② Although there is no need to make big changes to the previously used throttle and pitch curves, if you
lower the intermediate pitch curve points about 5% , you will hover at the same stick position as before.
③ There is no need to make big changes to the basic setup of dual rates and although gyro gain needs to
be decreased, this is done in the TAGS01 parameter setup, and no big transmitter gyro gain adjustment
should be required"
● TAGS01
The TAGS01 parameters need to be optimized for the MB-331 rotor head.
※ Compared to a 2 blade rotor head, our 3 blade rotor head has 1.5 times quicker control speed.
If you y with the default TAGS01 parameters, there will be hunting on the cyclic controls.
To avoid this, please optimize the TAGS01 parameters as described.
Although calibration is not required, please be sure to check control direction before ight.
Please use the G-TUNE interface cable supplied with this head and program our recommended optimized parameters.
Optimized parameter data is shown in the manual.
You may also download the latest parameter data from our website
http://jrpropo.co.jp/english/dl/
[HOME]>[DOWNLOADS]>[SOFTWARE]
If you need any help during parameter set up, please contact your JR helicopter seller.
Set the hovering pitch value 5 % less than
previously used with a two bladed head.
NOTE !
RADIO AND TAGS SETUP
P.7
Optimized parameters
NORMAL
* The values highlighted are modied from NEX E6-550 defaults.
STUNT
P.8
61792
61791
81073
70720
80246
80006
61790
61788
83159
61795
81061
80227
70665
81084
61793
81047
70662
70661
61789
61651
80073
80013
61794
80164
80226
80117
P.9
Item No. Description Qty. Note.
61651 Swash plate arm ×2 w/Joint ball screw L4
61788 Head button ×1 w/Socket head bolt M2 × 8
61789 Center hub MB-331 ×1
61790 Upper plate lock base assembly ×1 Bearing already installed
61791 Main blade holder assembly ×1 w/bearing, thrust bearing and washer
61792 FBL pitch arm (331) ×1 w/joint ball screw L4, socket head bolt
61793 Spindle shaft MB-331 ×3 w/O-ring 5.8 × 9.6 × 1.9 for one kit
61794 Swash plate assembly MB-331 ×1 w/control ball
61795 Blade holder MB-331 ×1
70661 Joint ball screw L4 ×5
70662 Universal link M2 × 10
70665 Washer 6 × 10 × 0.5 ×2
70720 Upper plate lock link ×1
80006 Socket head bolt M2 × 8 × 10
80013 Socket head bolt M3 × 8 × 10
80073 Socket head bolt M2 × 6 × 10
80117 Socket head bolt M2.6 × 6 × 10
80164 Nylon lock nut M4 (t3.8) × 10
80226 Main blade bolt set ×1 M4 × 24 2pcs
80227 Socket head bolt M2.6 × 5 × 10
80246 Threaded rod M2 × 39 ×2
81047 Thrust bearing 6 × 12 × 4.5 ×2 DDT-1260DSG
81073 Shielded bearing 6 × 13 × 5 ×2 L-1360ZZ
81061 Shielded bearing 2 × 5 × 2.3 ×2 L-520ZZ
81084 Flanged bearing F2 × 5 × 2.3 ×2 LF-520ZZ
83159 Carbon main rotor blades MB-331 ×3 L510
LOT NO. 2013.02
The product and the contents of these instructions are subject to change without notice due to improvement.
MB-331 Manual Ver 1.1
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