Hobby King ViperJet G500 User manual

High performance 90mm fiberglass jet
Assembly manual
For intermediate and advanced fliers only!
Specs
Wingspan: 1255mm
F selage length: 1250mm
Flying weight: 2600-3000g
Wing area: 22.6 dm²
Wing loading: 125g/dm²

Included in the box:
l F selage
l Main wings x2
l Winglets x2
l Horizontal stab x2
l Canopy
l 90mm EDF nit
l EDF f selage door
l Battery tray
l Tricycle landing gear with wheels
l Servo bay covers
l P shrods (x8) and associated hardware
l CF rod x2 (main wing and horizontal
stab attachment)
l Additional hardware (screws, bolts,
blocks etc.)
Equipment required (not included):
l 6 channel radio and receiver
l S itable motor and speed controller
l Servo extension wires
l 5g servos x3 (high q ality metal gears),
9g servo x1, 17g servos x4
l Epoxy (5 and 30min) and CA gl e
l Velcro
l Drill or dremel, 1.5mm, 2mm, 2.5mm
and 12mm bits
l Small screwdrivers and Allen (hex)
keys
l Craft knife
l Sandpaper

Step 1: Main wing ser o instillation
Locate the two main wings and c t away the covering film as below.
Remove the covering film from the fo r main wing servo bay covers to accommodate the
servo horns.

Take yo r fo r 17g servos and attach them to the nderside of each of these. (Tip, centre yo r
servos at this point to save nnecessary complications later on!) To do this, first screw two
small wooden blocks to each servo. Position as shown below.
Drill 1mm or 1.5mm pilot holes to prevent the screws from splitting the wood.
Then, gl e these in position to the nderside of the servo bay covers. Use 5min te epoxy or
strong CA. Attach the servos to their extension wires (appx. 50cm) and feed them thro gh the
wing thro gh to the exit provided as shown.

Sec re with a woodscrew in each corner. Again drill pilot holes to prevent the wood from
splitting.
Repeat for all fo r servos. Note the orientation of the servo door with respect to the wing.
Keep the orientation of the flap servo the same, as below
Step 2: Control surface attachment
The aircraft is s pplied with the control s rfaces in position, however they are not gl ed in
place. To attach them sec rely, first remove the s rface and hinges from the plane. Use a
small drop of CA gl e to sec re each hinge to the s rface, making s re appx. half of each
hinge remains exposed. Next, drop a small drop of CA on the tip of each hinge and slide it
into place. Repeat for all s rfaces.

Step 3: Control horns and cle ises
Start with the ailerons. Arrange the control horns in position and drill 2mm holes to bolt these
on. Drill f lly thro gh the s rface and attach on the other side sing the plastic pieces
provided.
Next take a main wing p shrod and install in the s al manner. Hint: to determine which
p shrods go where, arrange them in size as follows.
R dder
Flaps &
ailerons
Nose
gear
Elevators

Next do the flaps. Instead of bolting the flap horns in position, se two 2mm woodscrews
(provided) to attach them. Don’t drill pilot holes and se a drop of CA on each of the screws
to sec re.
Step 4: Rudder ser o, pushrod, horn and cle is instillation
The proced re for r dder set p is almost identical to that completed above. The only
difference to note is that a 9g servo is instead req ired and that the servo bay cover sho ld be
gl ed, not screwed in place. Feed the servo extension wire thro gh the body of the plane to
the nose.
Step 5: Main wing attachment
In preparation for gl ing the main wings in place, drill a hole in the following location,
thro gh which the servo wires will pass.
P t a drop of CA here
before tightening.

Take a look at where the servo wires exit the main wings if still ns re where to drill.
Next, ro ghen the s rface yo j st drilled thro gh sing sandpaper to ens re a good bond
between the main wings and the f selage.
Now, take a look at the following image.
25mm behind the hole for
the CF re-enforcement spar

Note the two CF locator pins to keep the incidence of the wing as designed. To install these,
first test fit them in each of the holes in both the f selage and wings. This is necessary as
d ring painting and transport these holes can effectively shrink. If they are too small, drill o t
to the diameter req ired.
Next, gl e these to the f selage (or to the main wings, the choice is yo rs) sing 5 min te
epoxy or strong CA. Wait for this gl e to dry and apply 30 min te epoxy between the main
wings and f selage. Apply gl e and tape or clamp both s rfaces and s pport sing blocks if
necessary. It is recommended that yo gl e both wings at the same time.
Step 6: Horizontal stab attachment
Repeat the same proced re as above for the horizontal stabs. Note that a symmetrical airfoil is
sed for these so there is no left wing or right wing as s ch, either orientation is correct.
Step 7: Ele ator ser o instillation
For the elevators, begin by taking two high q ality 5g micro servos. Screw these side by side
as shown. Drill pilot holes in the wooden blocks (provided) and make s re that the combined
width of the servos does not exceed 24mm.

Centre both servos and attach horns and clevises. Insert into the rear of the plane as shown
below.
Make s re that the servos fit as deep as possible in this slot, b t still move freely witho t the
clevises r bbing against the fiberglass. Try to vis alize where the thr st t be will event ally
reside and make s re that there will be eno gh clearance between the clevis and the t be.
Alternatively, flip the p shrods and se the Z bend in the servos and attach the clevises to the
control horns.

Step 8: Ele ator pushrod and horn instillation
C t a slot in the f selage as shown. (If yo do not have access to a dremel, drill a series of
3mm holes and c t o t with a craft knife).
Connect the p shrods to the servos and thro gh these slots. Finally, attach the horns to the
elevator s rfaces. Position these so that the p shrods move freely thro gho t the f ll range of
servo travel.

Step 9: EDF instillation
First assemble yo r EDF, motor and fan. Test for excessive vibrations. Also, make s re that
yo r motor is orientated s ch that the motor wires are as shown below.
Now, look back at the image above. Note that the fan protr des from the EDF d ct. Now
examine the f selage where the EDF will sit.
90
°
Note that this piece will interfere
with the placement of the EDF.

The fiberglass in this location m st be c t away to allow the fan to rotate freely.

Keep test fitting the EDF and checking to see if the fan can rotate freely. Sec re the two sides
together with strong tape. Feed the ESC and wires thro gh the body at this point also.
Next, drill pilot holes and sec re the EDF in position with large wood screws. Note that the
correct position for the EDF is as shown below. If the two s rfaces pointed o t below are not
fl sh with one another, yo may not have removed eno gh fiberglass above.
S rface 1 (EDF)
S rface 2 (Wooden mo nt)

Finally, attach motor wires to the ESC and test the direction of rotation.
Step 9: EDF shroud (thrust tube)
C t o t the following template from the sheet of fiberglass s pplied. The notch for the motor
wires is located appx. halfway along the 310mm side. Also note that the sheet yo are
provided with may look sq are, b t have one side longer than 310mm and the other side
shorter.
Roll this p and place it in the f selage. Pass the motor wires thro gh the notch. Sec re the
310mm
250mm
290mm
30x20mm

t be to the EDF with strong tape. If the template was meas red correctly, the shro d sho ld
reach almost to the rear of the f selage as shown below. Sec re with tape.
Step 10: Fuselage co er
Sec re with clear tape as shown below.

Step 11: Battery tray and nose gear ser o instillation
Take the battery tray and another micro servo and install as shown below.
Make s re yo gl e the battery tray in place with good, 30min te (or longer) epoxy, as there
will be s rprisingly large forges on these joints in flight. It is also recommended that yo trim
the battery tray slightly as shown below to maximize the gl ing area.
Trim edges on this side into a c rve
to follow the c
rve of the f selage

Step 12: Nose gear
Take the remaining block of wood provided in yo r kit and gl e in place with epoxy as shown
below.
Next, flip the plane over and drill a 2.5mm hole as shown. Aim for the centre of the block yo
j st gl ed. Use the image below for g idance
Here
Aim appx. 5mm in
front of this line

Keep the hole as vertical and as tr e as possible.
Next, take the nose gear str t and slide on a collar. Slide the assembly into the hole yo j st
drilled. If the hole is too small drill o t slightly, b t make s re that the str t is not loose in the
hole.

Flip the plane over and install the following parts as shown. Note the clevis.
Install the p shrod and a servo horn at this stage. Arrange the p shrod so that it passes
thro gh the small gap between the battery tray and the wooden str ct re beneath and the Z
bend attaches to the servo horn.