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Belt
Large Pulley
Small Pulley
Small Pulley
Correct
T
ension
T
ail Boom
Belt
Large Pulley
Small Pulley
Small Pulley
Incorrect T
ension
T
ail Boom
PRE-FLIGHT:
IT IS IMPORTANT TO PERFORM THIS PRE-FLIGHT SAFETY CHECK
BEFORE EVERY FLIGHT.
1. Assembling the Radio
Install eight (8) AA batteries into
the removable battery tray from
the back of the radio. Facing the
radio, twist the antenna into the
socket on the top of the radio
clockwise until it is tight. A loose
antenna could cause intermittent
control, running the risk of losing
control of the helicopter. (Fig. B)
2. Check for Loose Items
It is important to check the
helicopter for loose screws and
nuts before flight, in case they
have loosened in shipping. For
specific areas to check see (Fig. C).
- Tighten any loose screws. Only apply thread locking compound to
screws that have metal to metal contact, if needed.
- Ensure all components such as the Gyro and Receiver are
secured to the airfame.
- Check the Motor Mount and Servo Mounting screws.
- Check for any Servo Wires which may be touching the Spur Gear.
- Check the Head Assembly down to the Swash Plate.
- Check Tail, Tail Boom Mount/Belt Tension.
3. Check for Cracked or Damaged Parts
Any part that is cracked or damaged on the helicopter can cause
unpredictable flight performance. Specific areas to check (Fig. C):
- Landing Skids
- Tail Boom Mount
- Blade Grips
so that the bottom front rubber grommets can slip over the bottom front
canopy mounts. Then slip the top rear set of rubber grommets onto the
top rear canopy mounts.
Check the Center of Gravity (CG)
It is recommended that once the battery is fully charged and installed,
that the CG is checked.
To adjust the CG, position the flybar at a 90
o
angle to the tail boom. Pick up the VNR 3DXL™ by the flybar and
position the battery so that the tail boom is parallel to the floor (Fig. A)
Fig. B
3
Fig. A
Note: Lift by Flybar
Tail Heavy
Nose Heavy
Level
The boom should be level with the ground when the VNR 3DXL™ is lifted by the flybar. If
it is not, move the battery forward or backwards to balance. Always check the CG with the
battery and canopy installed.
III. MAIDEN FLIGHT CHECKLIST
4. Adjusting the Tail Rotor Belt Tension
Inspect the belt tension to make sure it is properly set. If it is too loose,
the belt can slip causing unpredictable tail control and damage to the
belt. If the belt is too tight, it will rob the helicopter of power and can
also have adverse effects on tail control. Check the belt tension by
pressing on the belt right between where it enters the boom and the
main mast. You should be able to press the belt to roughly half the
distance to the other side of the belt. See (Fig. D)
If the tension is not correct, adjust it by sliding the boom in or out of
its housing. First, loosen the two screws that hold the tail boom in
place. These screws are located on the top right side of the front edge
of the boom. Next, loosen the horizontal fin screws so the boom can
be pulled out straight. Once they are loose, pull the boom out if the
tension is too loose . Push the boom in if there the tension is too tight
(Fig. E).
Fig. C
Landing Skids
Tail Boom Mount/Guide Pulley Set
Head Assembly
& Swash Plate
Fig. D
Fig. E
Adjust
Loosen
Summary of Contents for Night Ranger 3dxl
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