XLPower NIMBUS 550 User manual

1
Instruction Manual
Manual Release 1.2
Always Check http://xlpower-rc.com for the latest version of this manual
Length Without Main Blades:
Overall Height:
Width:
Main Gear:
Pinion Gear:
Motor Shaft Diameter:
Main Gear Ratio:
Front Tail Pulley:
Rear Tail Pulley:
Tail Ratio:
Frame Weight With Blades:
Main Shaft Diameter:
Feathering Shaft Diameter:
Tail Boom Diameter:
Tail Belt Width:
Main Gear Thickness:
Battery Compartment Size:
1120mm
302mm
196mm
106T Mod 1
12T (11-13T Optional)
5-6mm (Length 20-38mm)
8.83 (8.15 - 9.63 Optional)
60T
13T
4.615
1560g
10mm
8mm
27mm
6mm
10mm (12mm Optional)
290mm * 53.5mm * 60mm

2
Always Follow These Rules For Safety
If you do not observe these instructions, you may be held liable for injury or damage.
Operate the helicopter in open areas with no people nearby. Do NOT operate the helicopter in these situations or areas:
In places where children gather or people pass through
In residential areas and parks
Indoors and in limited space
Extremely windy weather or when there is rain, snow, fog or other precipitation
When operating and tuning/adjusting your model, keep the following in mind:
ALWAYS check radio control system for proper operation before operating the model.
ALWAYS check radio control system power levels before operating the model. Flying with low transmitter or receiver battery may cause loss of control.
ALWAYS pay attention to your surroundings, and look out for others who are also operating a radio control model nearby.
ALWAYS check that all screws are tight and not coming loose before ying the model. A single loose screw on the model may cause a major accident.
ALWAYS perform necessary maintenance and preight checks to keep the helicopter in a good and safe ying condition.
NEVER use the same control frequency as someone else. Doing so may cause interference or loss of control of the model.
NEVER continue ying if the model is displaying irregular behavior or noises. Bring the model to a halt immediately and disconnect the batteries.
NEVER y the model with known broken or defective parts. Always replace damaged parts before attempting to y again.
NEVER approach the model while the rotors are still spinning. Doing so can result in serious personal injury.
NEVER touch the motor immediately after ying. It may be hot enough to cause moderate burns.
Operate only outdoors and out of bystanders’ reach, as the main rotor operates at high rpm and is very dangerous.
While adjusting and testing, pilots and observers should stand at least 10 meters from the model.
Novice pilots should be assisted by an experienced pilot and never y alone!

3
Equipment Required for Assembly
Main Blades:
Carbon Fiber 520mm - 580mm
Tail blades:
Carbon Fiber 80mm to 95mm
Swashplate Servos:
Mini Size or
Standard Size (Qty. 3)
Tail Servo
Standard Size (Qty. 1)
Trasmitter
Receiver/Satellites
Flybarless Unit
Battery Pack (Typical):
LiPo 6s-8s 3300-5500mAh or
LiPo 12s 2600-3300mAh
ESC:
100-150LV (6s-8s)
80-120HV (12s)
Motor:
4020-4035 900kv-1200kv (6s-8s)
4020-4035 500kv-550kv (12s)
Hex Screwdriver Sizes:
1.5mm
2mm
2.5mm * 2
3mm*2
Thrust Bearing Grease
Where indicated, use
Thread lock MEDIUM
Pitch Gauge

4
Bearing
8*14*4
ART. XL52A10
Thrust Bearing
8*14*4
ART. XL52H10
Washer
10*14*1
ART. XL52H10
Main Blade Grip
ART. XL55H01
Smaller ID Towards Blade
Larger ID Towards Hub
Bag1Bag1
Bearing
8*14*4
ART. XL52A10
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Apply grease on thrust bearing

5
Main Blade Grip Arm
ART. XL55H02
Outer hole for stable
Inner hole for agile
Ball 4.72mm M2.5*3
ART. XL52A01
Hex screw
M2.5*8
ART. MSH71111
Bag1Bag1 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight

6
Special Washer
ART. XL52H14
Spindle
ART. XL52H06
M5 Washer
ART. XL52H06
Main Rotor Hub
ART. XL52H01
Bag1Bag1
ART. XL52H14
Sport / 3D
(70° O-Ring)
Included in kit
Head Dampeners
ART. XL52H14-1
For both low HS and Hardcore 3D
(POM with 70° O-Ring)
Optional
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Apply silicone grease on the
damper and Spindle
Pay attention to the
direction
POM Damper set
includes standard
washer to replace
special washer

7
Bag1Bag1 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Swashplate Assembly
ART. XL52H04
Ball4.72mm*24.2
ART.XL52A01
Ball 4.72mm M2.5*3
ART.XL52A01
Ball 4.72mm *7.4
ART. XL52A01

8
Nimbus Main Shaft
ART. XL55H03
Bag1+Bag2Bag1+Bag2 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Screw M3*16
ART. XL55H03
Short Hole Distance
Towards Rotorhead

9
Pre Assembled
Bag1Bag1 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Ball Bearing
3*6*2.5
ART. XL52A13
Spacer 3*5*0.5
ART. XL70A19
Pin 3*13
ART.XL52H03
Control arm
ART.XL52H03
Radius Arm
ART.XL52H03
ART.XL52H11
Ball Bearing
3*7*3
ART. XL52A12
Spacer 3*5*0.5
ART. XL70A19
Screw M3*20
ART. MSH51150

10
Servo rod length may dier slightly
with dierent servo brands
Right thread
Left thread
Pay attention to
the Mark
15.5mm
Main rotor linkage
ART. XL52H12
Bag1Bag1 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
23.4mm (Mini servo)
15.7mm(Standard servo)
Servo rod
ART. XL52H13

11
Flat head screw M2.5*6
ART. XL55A02
Quick Release Battery System
ART. XL55B03
Lower Carbon Frame
ART.XL55B02
Bag3+Bag4Bag3+Bag4 Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight

12
Small Notch in the Rail
Faces Up
Allows Latch Pin to Pass Through
Battery Tray Rail
ART. XL55B01
Screw M2*8
ART. XL55A01
Nut M2
ART. MSH71095
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag3+Bag4Bag3+Bag4

13
Carbon Fiber Lower Frame
ART. XL55B02
Battery Tray Rail
ART. XL55B01
Screw M2*8
ART. XL55A01
Nut M2
ART. MSH71095
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag3+Bag4Bag3+Bag4

14
Belt Front Idler
ART. XL52B11
Ball bearing
3x7x3
ART.XL52A12
Carbon Fiber Plate
ART. XL55B04
Flat screw M2.5*6
ART. XL55A02
Special washer
ART. XL52B11
Step side Faces bearing
Front Belt Idler Mount
ART. XL55B05
3*17 Pin
ART. XL52B11
Frame Spacer
ART. XL55B06
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag3+Bag4Bag3+Bag4

15
Hex screw
M2.5*6 (yellow in picture)
ART. MSH71110
Hex screw
M2.5*8 (Red in picture)
ART. MSH71111
View from back side
Tail Boom Clamp (Remove M2.5*5
screw rst)
ART. XL55B07
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag4Bag4

16
Carbon Fiber Upper Frame
ART. XL55B08
Hex screw
M2.5*6 (yellow in picture)
ART. MSH71110
Hex screw
M2.5*8 (Red in picture)
ART. MSH71111
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag3+Bag4Bag3+Bag4

17
View from side
Landing Gear Mount
ART. XL55B09
Hex screw M2.5*6
ART.MSH71110
Landing Gear Strut
ART. XL55B10
Option：XL55B10-1
Hex screw M3*8
ART.MSH71109
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag5Bag5

18
Skid Pipe
ART. XL52B15
Grub Screw M3*3
ART.MSH71121
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag5Bag5

19
Hex screw
M2.5*8
ART. MSH71111
Upper STD Servo Mount
ART. XL55B11
Lower STD Servo Mount
ART. XL55B12
Yellow surfaces should be parallel
to each other and perpendicular
to red surface to allow servo to t
properly without binding
Main shaft block (STD)
ART. XL55B13
Hex screw M3*10
ART.MSH71099
Center plate
ART. XL55B14
Double row angular con-
tact ball bearing 10*19*7
ART. XL70H04
Clean all screws and threads with isopropyl alcohol (90%
or above) to ensure threadlocker bonds properly and
prevent screws from loosening in ight
Bag6 (XL55V2K02Bag6 (XL55V2K02））
High Strength
Bearing
Retainer

20
Carbon Servo Washer
ART. MSH71032
Hex Screw M2.5*10
ART. MSH71103
Servo Horn
XL52A19
Optioal: XL55A03
15-17mm
Ball 4.72mm M2*4.8
ART.XL52A01
Nut M2
ART. MSH71095