Skymaster Viper Jet XXL instruction manual

1/2.5 Scale Almost-Ready-To-Fly RC Jet
Assembly and operations manual
Spesifications
Type :
Scale :
Length :
Weight :
Radio :
T.A.V.S ARF PRO
1/2.5
133”: (3380mm)
25—30Kg
12 Ch ( 8—12servo’s)
Span : 140 ”: (3560mm)
Turbine: 1 x 21-31 Kg (single)
The VIPER XXL by Skymaster
The 1/2.5 VIPER produced by Skymaster is the result of years of R&D work and excessive testing. We are proud
that you have decided to buy the best ARF ViperXXL in the market today. We hope you enjoy your jet! Please
note that the photos show certain views from the prototypes. Some modifications and upgrades might have taken
place by the release of the model. Many scale options are included with your model include, speed brakes and
lights. This manual describes the assembling of “ PRO” model. Speed brakes, landing gear and doors are factory
installed. Before you start building and setting-up your aircraft, please make sure you have read this instruction
manual, and understood it. If you have any questions, please don’t hesitate to contact us. Below are the contact
details:
Office Taiwan:
No.15, Min-San 3rd Street, Ren-Wu Area, Kaohsiung, 814, Taiwan, R.O.C.
TEL: +886 9 3299 7923
FAX: + 886 7373 1215
http://www.skymasterjet.com
Sales : skymaste@skymasterjet.com
Technical support : morne.m@pixie.co.za
SM © 2018
Assembly & Operation Manual
Index:
INTRODUCTION....................................................................................................................................... 3
DISCLAIMER..............................................................................................................................................3
WARNING…...............................................................................................................................................3
ARF PAINT.................................................................................................................................................4
FINISHING YOUR VIPER….......................................................................................................................4
HANDLING & TRANSPORTING ...............................................................................................................5
TOOL LIST................................................................................................................................................ 6
HEALTH…..................................................................................................................................................7
GENERAL ASSEMBLY TECHNIQUES..................................................................................................…7
RADIO EQUIPMENT & ACCESSORIES…………….................................................................................8
KIT CONTENTS…….……………...............................................................................................................9
OPTIONAL PARTS………………..……………….....................................................................................10
WINGS …………………………………………………………………………………………………………...12
RUDDER FIN...........................................................................................................................................13
STABILIZER.............................................................................................................................................14
FUSELAGE REAR..………………….........................................................................................,,............ 15
LANDING GEAR…........………………………………………………………………………………………….16
FUEL CELLS…………………………………………………………………………………………………...…16
FUEL DIAGRAM………………………….………………………………………………………………………17
AIR SYSTEM .......................................................................................................................................... 18
AIR DIAGRAM......................................................................................................................................... 19
TURBINE INSTALLATION……………………………………………………………………………………....20
COCKPIT & CANOPY…......................................................................................................................... 21
EQUIPMENT INSTALLATION INTO THE VIPER ARF…...…….............................................................22
BEFORE YOU FLY.................................................................................................................................. 23
P-2
Assembly & Operation Manual
INTRODUCTION
Thank you for purchasing Skymaster arf pro VIPER ! We have put a lot of effort and time into this model.
We at Skymaster strive to be a market leader in the ARF— jet market. We were the first company to
produce ARF—jets in the world and we would like to continue being amongst the best. Although we
have made every effort that this model was fit for shipping, we would like you to inspect the contends
and call your nearest dealer immediately if any defects or missing parts are spotted! This manual will
allow you to duplicate the factory prototypes.
LIABILITY
You have acquired a kit, which can be assembled into a fully working R/C model when fitted out with
suitable accessories, as described in the instruction manual with the kit. However, as manufacturers, we
at Skymaster are not in a position to influence the way you build and operate your model, and we have
no control over the methods you use to install, operate and maintain the radio control system components. For this reason we are obliged to deny all liability for loss, damage or costs which are incurred
due to the incompetent or incorrect application and operation of our products, or which are connected
with such operation in any way. Unless otherwise prescribed by binding law, the obligation of the Skymaster company to pay compensation is excluded, regardless of the legal argument employed. This applies to personal injury, death, damage to buildings, loss of turnover and business, interruption of business or other direct and indirect consequent damages. In all circumstances our total liability is limited to
the amount which you actually paid for this model.
BY OPERATING THIS MODEL YOU ASSUME FULL RESPONSIBILITY FOR YOUR ACTIONS.
It is important to understand that Skymaster, is unable to monitor whether you follow the instructions
contained in this instruction manual regarding the construction, operation and maintenance of the aircraft, nor whether you install and use the radio control system correctly. For this reason we at Skymaster
are unable to guarantee, or provide, a contractual agreement with any individual or company that the
model you have made will function correctly and safely. You, as operator of the model, must rely upon
your own expertise and judgment in acquiring and operating this model.
WARNING
This ‘jet’ aircraft is a high-end product and can create an enormous risk for both pilot and spectators, if
not handled with care, and used according to the instructions. Make sure that you operate your jet according to the AMA rules, or those laws and regulations governing model flying in the country of use.
The engine, landing gear, servos, linkages and control surfaces have to be attached properly. Please
use only the recommended servos and accessories. Make sure that the ‘Centre of Gravity’ is located in
the recommended place. Use the nose heavy end of the CG range for your first flights. A tail heavy
plane can be an enormous danger for you and all spectators. Fix any weights, and heavy items like batteries, very securely into the plane. Make sure that the plane is secured properly when you start the engine. Have a helper hold your plane from the nose before you start the engine. Make sure that all spectators are far behind, or far in front, of the aircraft when running up the engine. Make sure that you
range check your R/C system thoroughly before the 1st flight. It is absolutely necessary to range check
your complete R/C installation first WITHOUT the engine running. Leave the transmitter antenna retracted, and check the distance you can walk before ‘fail-safe’ occurs. Then start the engine, run at about
half throttle and repeat this range check. Make sure that there is no range reduction before ‘fail-safe’
occurs. If the range with engine running is less then with the engine off, please DON’T FLY at that time.
Make sure that your wing spar tube is not damaged. Check that the anti-rotation dowels for the wings
are not loose. Check that the wing, stab, fin and nose retaining bolts are tight. Please don’t ignore our
warnings, or those provided by other manufacturers. They refer to things and processes which, if ignored, could result in permanent damage or fatal injury. Secure the plane before starting engine.
P-3
Assembly & Operation Manual
ARF Paint
The color finish on your Skymaster VIPER arf pro model was applied out of the mold.
We have used only the highest standard automotive paints to finish your model.
Should you damage the finish, Skymaster stock the color paint and hardener required
for the repair. A good automotive spray painter should also be able to mix and supply
the correct samples for repair.
If you have no experience in the use of these paints, it will be best to seek assistance.
Do not leave your model unprotected in the sun! always cover your model or park it in
the shade. Extreme temperatures will damage the paint!
Finishing Your All White VIPER XXL ARF PRO
It is always best to fully assemble the model before painting. By doing so no damage
or glue prints will ruin the paint.
The all white model will have some release agent on the surfaces.
Use #1000 wet and dry paper to sand the entire model. Mold lines can be sanded and
filled using normal automotive fillers.
Please be extra careful when sanding near the hinge line! The hinges can easily be
damaged. When masking and painting please make sure the control surfaces are not
bend past 90—180 degrees extensively. This will cause the hinges to crack and may
cause flutter.
The clear canopy are not installed. It is best to install these components after painting
was done.
P-4
Assembly & Operation Manual
HANDLING & TRANSPORTING
Composite models are very light but strong. These characteristics do have a down side!
It is brittle.
Take care when handling your model. DO NOT ATTEMPT TO PICK UP AN FULLY FUELED
MODEL BY THE LEADING EDGE BY YOURSELF! The leading edges will crack and delaminate. Full size jets have specially marked access points for the hooks of cranes!
Inspect your model before and after a rough landing. Make sure all parts are safe and sound.
Inspect model before and after transport. A sudden stop can easily cause an unnoticed dent!
We recommend to REMOVE the rear fuselage and wing tips for transport. It will only take a
couple of seconds.
The wings and tails are very flight worthy structures. They are light and extremely strong , however, they will dent if mishandled. Always support these structures on clean soft foam rubber.
P-5
Assembly & Operation Manual
Tools and Adhesives
Tools etc:
This is a fairly quick and easy plane to build, for a jet model, not requiring difficult techniques or special equipment, but even the building of Skymaster aircraft requires some
suitable tools! You will probably have all these tools in your workshop anyway, but if
not, they are available in all good hobby shops, or hardware stores like "Home Depot"
or similar.
1. Sharp knife (X-Acto or similar)
2. Allen key set (metric) 2.5mm, 3mm & 5mm
3. Sharp scissors, curved type for canopy
4. Pliers (various types)
5. Wrenches (metric)
6. Slotted and Phillips screwdrivers (various sizes)
7. Drills of various sizes
8. Battery drill and Dremel tool (or similar) with cutting discs, sanding tools and mills
9. Sandpaper (various grits), and/or Permagrit sanding tools.
10. Carpet, bubble wrap or soft cloth to cover your work bench (most important !)
11. Car wax polish (clear)
12. Paper masking tape
13. Denaturized alcohol, Acetone, or similar (for cleaning )
Adhesives:
Not all types of glues are suited to working with composite parts. Here is a selection of
what we normally use, and what we can truly recommend. Please don’t use inferior
quality glues - you will end up with an inferior quality plane, that is not so strong or
safe. Jet models require good gluing techniques, due to the higher flying speeds, and
hence higher loads on many of the joints. We highly recommend that you use a slow
cured epoxy for gluing highly stressed joints, like control horns, into position. The most
commonly used is ‘Aeropoxy’. The self-mixing nozzles make it easy to apply. It takes
about 1 - 2 hours to start to harden so it also gives plenty of time for accurate assembly. Finally it gives a superb bond on all fiberglass and wood surfaces.
1. CA glue ‘Thin’ and ‘Thick’ types. We recommend ZAP, as this is a very high quality.
2. ZAP-O or Plasti-ZAP, odorless (for gluing the clear canopy)
3. 30 minute epoxy (stressed joints must be glued with 30 min and NOT 5 min epoxy).
4. Aeropoxy/Loctite Hysol 3462 or equivalent (optional, but highly recommended)
5. Epoxy laminating resin (12 - 24 hr. cure) with hardener.
6. Milled glass fiber, for adding to slow epoxy for stronger joints .
7. Micro-balloons, for adding to epoxy for lightweight filling.
8. Thread-locking compound (Loctite, or equivalent)
At Skymaster we try our best to offer you a high quality kit, with outstanding value-for money, and as complete as
possible. However, if you feel that some additional or different hardware should be included, please feel free to let
us know.
P-6
Assembly & Operation Manual
HEALTH
Use a mask (available at auto paint stores) to protect from inhaling the glass or carbon
fiber dust. Use this mask whenever you are sanding or cutting fiberglass or
carbon fiber materials. Use a charcoal filter paint mask (available at auto paint supply
stores) when spraying any primer or paint. Spray out of doors or in a properly vented
spray booth. Use safety glasses any time rotary tools, such as Dremel cut-off disc or
Perma-Grit cutters, are being used.
GENERAL ASSEMBLY TECHNIQUES
We recommend to wax the model before assembling. This will help protect the finish
from an epoxy finger print. Wax will not help for CA glues!
Extra glue, extra paint, extra resin will add up to a heavy model. Plan before you glue!
The glass cloth side of parts to glue, should be sanded with #80 grit paper for best
glue adhesion.
Support the fuselage on foam pads.
Skymaster makes every attempt to insure that the parts fit. However, due to manufacturing tolerances, some parts may fit a little tight. Always trial fit parts and adjust if
needed.
Only use high quality adhesives such as the ZAP products from Pacer Technology.
For extremely high stress areas we recommend “Aeropoxy.” It is the strongest and
best gripping adhesive we have found.
If fuel or grease are on the surface, first clean with acetone or thinners.
Clean off all excess glue—excess glue is excess weight.
Always check the outside skin of the model to look for any glue residue and remove it
with Acetone before it cures. “Aeropoxy” is tough to remove once it has thoroughly
cured.
P-7
Assembly & Operation Manual
Radio equipment
Failure to use the recommended servos, output arms, extensions, and hardware
may result in a loss of control!
Throughout this manual we make use of various types of servos and radio equipment!
The prototype was flown using MKS servos with powerbox bus system!
If you make use of another manufacturer, please use equipment with similar specifications! For JR we recommend DS8911HV servos.
The VIPER will require extension leads! Please use high quality extension leads. Make
use of ceramic non ferrite cores if leads exceeds 1 meter. We recommend using X-bus
system. This will eliminate long power leads.
Use dual battery management systems and dual RX equipment. With the introduction
of 2.4 GHz even quad RX systems are considered as normal for a jet model.
Always center and install the correct output arms while on the bench, once the servo is
in the aircraft access to the servo arm screw is sometimes limited.
Do not save any money when buying radio equipment. The price of servo’s are far
from the price of replacing the entire model.
REMEMBER: The best equipment is only as good as the weakest link. Ask yourself if this servo or link or lead etc is worthy of my trust to protect my very large
investment…
Accessories
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
14.
15.
16.
2 MKS 9910servo’s for the elevator.
2 MKS9910for flaps
2 MKS9910 for ailerons
1 MKS9910 for rudder
1 MKS9910 for steering servo.
2 x 2way valve + 1 x 1way valves
sequencer for landing gear + doors + brakes
1 x 2 way valve for speed brake
Powerbox Royal with X-Bus support SRS
Pneumatic support set for landing gear
1 x Turbine motors, with thrust range between
21Kg to 31kg, with accessories.
Fuel tubing, Hopper tank, festo fittings, fuel filters, fuel tube etc
Cable ties in various lengths.
Radio system with S-bus or X-bus technology (will simplify the radio installation)
Did you understand everything in this manual completely?
Then, and only then, let’s start assembling your VIPER. If not, please read it
again before you start the assembly.
P-8
Assembly & Operation Manual
Kit Contents
Picture A
VIPER XXL ARF PRO Contents:
Picture A
Fuselage front, middle and rear section + hatches
Fin + Rudder & tail cone.
Nose gear + Main gear + doors installed
Wings centre section + flaps + winglets
Wing tips left and right + Ailerons
Fuselage strakes
Elevator
Canopy assembly + glass
P-9
Assembly & Operation Manual
OPTIONAL PARTS
3 x Air Tanks
1 x Retract Valve
2 x Filler & 2 x Pressure Gauges
1 x Electronic Brake Valve
5 x Air Tubing, 10 x Quick Disconnect
Photo 1
Fuel Tank
Accessory Set
Photo 2
Photo 3
Jettronic 2way & 1 way valve
& Sequencer
Control Brake, Gear and Doors
Photo 4
Stainless Tail Pipe
Cockpit + Pilot
Photo 5
Photo 6
P-10
Assembly & Operation Manual
L/G hydrolic set
Photo 7
Metal horns
Photo 9
Tank Hardware
Photo 8
Photo 10
LG Set + UAT
Photo 12
Photo 11
Photo 13
Wing bag
P-11
Assembly & Operation Manual
WINGS
NOTE: Make sure to have some sort of protective foam on the work bench. This will
protect the paint surface from unwanted dents. Assemble both wings simultaneously.
Mark √ each step.
The VIPER XXL have a 3 piece wing. Centre wing bolted to fuselage and holds the
landing gear, flaps. The tips hold ailerons and are removable for transport.
FLAPS & AILERONS:
Photo 14
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Photo 15
Photo 16
Fit large servo metal horns to MKS9920 servos. Repeat for all 4 servos.
Mark location of flap pushrod and cut slot in trailing edge.
Secure the 2 servos and pushrods to flap brackets.
Draw a line perpendicular across the hinge line and mark location for dual carbon
horns for flaps—check that flap pushrods aeembly move free into slot.
Dremel slot. Make sure the horns are supported by balsa inside flap.
Glue 2 horns parallel each other with 5 minute epoxy. Width must be same as
bearing link for tight fit.
Fit 2 aileron servos to wing tips. Mark location
for aileron horns and cut slot in skin.
Install the pushrods with bearing link.
Draw a line perpendicular across the hinge line
and dremel slot for dual carbon horns.
Glue with 5minute epoxy. Make sure balsa
block installed into aileron
Photo 17
Cut the servo & pushrod cover and screw in position.
Install the tips and check operation of all surfaces. Route wires through centre wing.
P-12
Assembly & Operation Manual
FIN & RUDDER
NOTE: Make sure to have some sort of protective foam on the work bench. This will
protect the paint surface from unwanted dents. No play must be present. Mark √ each
step.
Photo 18
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Photo 19
Fit horn to servo and centre servo. Remove horn.
Fit servo to bracket.
Make up servo horn assembly. Use Loctite to secure horn.
Install horn through skin and make sure free movement. Sand skin if needed.
Trial fit the rudder to fin by inserting hinge pin.
Trial fit servo horn into rudder slot. Check that you have no play.
Check left and right deflection. If happy secure fin. Route servo wires away tailpipe.
Note—Rudder and fin must be fitted before tailpipe.
Photo 20
Photo 21
P-13
Assembly & Operation Manual
ELEVATOR
NOTE: Use some protective foam on the work bench to protect the paint surface from
unwanted dents. Mark √ each step.
Photo 22
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Fit elevator to stab by hinge pin. Check operation and no play. Sand if needed.
Fit metal servo horn and center servo using radio. Synchronize the servos.
Fit servo to stab brackets. Mark location of horn in skin. Cut slot with dremel.
Draw a line perpendicular across the hinge line and mark location for dual carbon
horns for elevators—check that elevator pushrods aeembly move free into slot.
Dremel slot. Make sure the horns are supported by balsa inside elevator
Glue 2 horns parallel each other with 5 minute epoxy. Width must be same as
bearing link for tight fit.
Check operation and movement of elevator.
Make up 2 elevator pushrod bearing mounts. Same
length. Install pushrods.
Run servo wires away from tailpipe.
Connect to temporarily to radio and check operation
of elevator.
P-14
Photo 23
Assembly & Operation Manual
FUSELAGE REAR
Photo 24
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Before joining the fuselage it is necessary to tidy up the servo wires. Make sure
wires are secure and will not touch the tailpipe.
Use quick disconnects between front and rear fuselage.
Check operation of rudder and elevator
Install the ventral fins below fuselage with bead of silicon.
NOSE STEERING
Photo 25
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Photo 26
Fit steering servo.
Check operation of nose LG & doors.
P-15
Assembly & Operation Manual
LANDING GEAR
Photo 27
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Photo 28
Photo 29
Gear is part of centre wing section.
Check operation of main gear and doors. All factory fitted. Root all air pipes and
servo wires neatly to front of fuselage. Use quick disconnects.
With gear in centre wing it makes it easy to assemble at flying field. Centre section
can be left on fuselage.
NOTE: Real Viper has no gear doors in fuselage.
FUEL CELLS
NOTE: Bad plumbing lead to flame outs. This will destroy your model. Please take your time
and do a good job.
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Make sure clunk moves freely and reaches all corners of inside of tanks.
Fit to main tank. Mark pipes for “inlet” and “outlet”.
Secure tank in position. The main tank will feed
UAT.
Plumb tank using diagram on next page. Fill tank
and check for leaks.
Drain tank with turbine fuel pump and check no air.
Bubbles in system until last drop is drained. A good
plumbing will secure good turbine operation.
Photo 30
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Assembly & Operation Manual
FUEL CELL DIAGRAM
Photo 31
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Assembly & Operation Manual
AIR SYSTEM:
You will need 2 x 2way and 1x 1way + sequencer for doors and brakes. You will
need 1 x 2 way for operating speed brake. All work done at factory.
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Glue the air tanks (4) with silicon
Use quick connectors on fuselage joints to help
with break up of model.
Fit the 3 filler valves and 3 pressure gauges
onto tray in nose
Photo 32
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Plumb the landing gear, door and brake system by using color air tubing. T all
same color tubing together until a single pipe emerge.
Fit electronic valves + sequencers on tray.
Secure 1 x 2way valve to operate speed brake.
Air leaks can damage your model! Please do a thorough check for air leaks. Make
sure the system can hold pressure for at least an hour in the up and down position.
Do not rush this installation.
Photo 33
P-18
Assembly & Operation Manual

For scale functions such as speed brake you will require additional 2 way
electronic valves.
Photo 34
AIR DIAGRAM
Photo 35
P-19
Assembly & Operation Manual
TURBINE AND TAIL PIPE INSTALLATION
NOTE: Use the manufacturer recommendations when installing your turbine. We have used
a Kingtech K310G2 turbine with a thrust of 31Kg.
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Photo 36
Photo 37
Photo 38
Photo 39
Please follow the instructions supplied with your turbine.
Use FOD screens. Secure all wires and cables and pipes. We recommend to make
use of a mechanical shut off valve as well.
Silicon glue bell mouth to pipe.
Secure L-Brackets to bell mouth and secure to turbine rail. NOTE: For transport we
recommend to remove rear of fuselage. Pipe must be removable to do this.
The tail cone will twist and lock to decure pipe.
Photo 40
P-20
Assembly & Operation Manual
COCKPIT AND CANOPY (after painting)
Photo 41
Photo 42
NOTE : PRO kit will have cockpit installed.
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Cut cockpit to fit fuselage and front nose gear.
Secure rear of cockpit with 2 screws.
Check that canopy clear the cockpit. Trim if needed.
Install the pilots.
P-21
Assembly & Operation Manual
EQUIPMENT INSTALLATION INTO VIPER

1.
2.
3.
4.
5.
6.
7.
Equipment installation is a personal venture. There is one golden rule: Do it as neat
and logical as possible! This will make fault finding and service of components easier. The Viper basically consist of 7 circuits!
Servo wires
Power cables
Data cables
Pneumatic pipes
Air pipes
Fuel pipes
RX cable / Satellite Receivers
Please try and separate these circuits as far as possible. It is advisable not to run RX
cables near any kind of electrical fields. Make all switches and filler valves and charging sockets easy accessible. If you use S-bus technology it will simplify installation.
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The VIPER will come out tail heavy if you do not plan installation. It is very important to install all equipment as far forward as possible.
Removable nose hatch make access to radio gear easy.
I have installed all batteries in nose.
.
Photo 43
P22
Assembly & Operation Manual
BEFORE YOU FLY
It is assumed that the builder of this kit has acquired the basic skills and
knowledge necessary to make a safe and functional radio control installation into a model. Therefore, these notes are intended only to assist that experience.
TRAVEL MAX SETTINGS:
1.
2.
3.
4.
Elevator
Rudder
Aileron
Flaps
+35 mm/ -35 mm
+40 mm /-40 mm
30 mm down / 35 mm up
100 mm landing / 50 mm take off
Do not change location of CG unless you are experience and have some feel of
model before!
CG: 160 mm from root at outer wing panel
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Set the max speed to 150mph! The prototype was tested with a
K310G2 turbine.
The VIPER XXL was fitted with the longer scale wings. Weight was
saved via new construction techniques. Please do not use this jet
for high G maneuvers and high speed flying. This jet was designed for scale flying and not high performance sport jet.
Photo 44
P-23
Assembly & Operation Manual
Take-Off
Do some taxi tests before your flight! Make sure you are familiar with all settings and
make sure the model track straight on the ground without rudder input.
Choose a fine day for the maiden flight. Select take off flap or flight mode 1 and open
throttle. Gently pull back on stick 30m down the runway. Raise the flaps and gear at
safe altitude. If the ailerons feel sluggish—select higher rate. Land and adjust to fit
your need.
Slow Flight
Most of the first flight should be utilized to get familiar with the slow speed flight characteristics. Select the flaps to the takeoff position; there should be no pitch change. Extend the gear and select full landing flaps; adjust the power to maintain level flight and
a speed of about 60—70mph. Climb to a safe altitude and slow the model to the edge
of a stall to know where that edge is.
Landing
Fly a complete circuit before landing. Approach from the downwind side and lower the
LG. Fly a complete circuit getting use to the power required. On the next circuit lower
the flaps. It is very important to get the nose above horizon for landing as the viper will
float and you may land deap. Do a go around and land again. The wing loading is very
good and slow landings is easy once your skill level is good. Use elevator to get nose
up and throttle to change altitude. You will need to work out a glide slope to fit your run
way. Just before touch down—pull more elevator to flare model. Do not pull to much
elevator in glide slope as you may snap the airframe. There is fine line between just
right and too much. Do not use speed brakes for landing on maiden. Let the model
roll out and apply brakes.
We at Skymaster wish you many happy flights with your VIPER XXL! Add some landing lights and smoke to make a good show plane.
Anton Lin and Skymaster Team!
P-24
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