Assembly and Operational Instructions Manual
Designer and test pilot : Anton Lin
Instruction Manual : Morné Nortier
Office Taiwan:
No.9.39 Lane,Yuag-Chang 2nd Street, Ren-Wu Hsiang, Kaohsiung Hsien, 814, Taiwan, R.O.C.
TEL: +886 9 3299 7923
FAX: + 886 7373 1215
Tech support : morne.m@pixie.co.za
For any further information and updates please visit www.skymasterjet.com
SM © 2010
Assembly & Operation Manual
Index:
INTRODUCTION..................................................................................................................................................... 3
DISCLAIMER..............................................................................................................................................3
WARNING…...............................................................................................................................................3
ARF PAINT.................................................................................................................................................4
FINISHING YOUR WHITE VIPER ARF......................................................................................................4
HANDLING & TRANSPORTING ...............................................................................................................5
LIVE HINGE ……………………………..……….........................................................................................5
TOOL LIST............................................................................................................................................................... 6
HEALTH….................................................................................................................................................7
GENERAL ASSEMBLY TECHNIQUES............................................................................................................…7
RADIO EQUIPMENT ……………..........................................................................................................................8
COMPOSITE PARTS……………............................................................................................................................9
OPTIONAL PARTS……………………………………….....................................................................................10
CONTROL LINKAGES .........................................................................................................................................11
WINGS......................................................................................................................................................................11
STABILIZERS.........................................................................................................................................................13
FIN & RUDDER...................................................................................................................................................... 15
VENTRAL FINS…………………………………………………......................................................................... 16
FUSELAGE............................................................................................................................................................. 17
TAILPIPE………………………………………………………………………………………………………….18
FUEL CELLS…………………………………………………………………………………………………...…19
FUEL DIAGRAM…………………………………………………………………………………………………20
TURBINE INSTALLATION................................................................................................................................. 21
AIR SYSTEM ......................................................................................................................................................... 22
AIR DIAGRAM....................................................................................................................................................... 23
COCKPIT & CANOPY…...................................................................................................................................... 24
EQUIPMENT INSTALLATION INTO THE VIPER ARF…………................................................................25
BEFORE YOU FLY................................................................................................................................................ 26
P-2
Assembly & Operation Manual
INTRODUCTION
Thank you for purchasing Skymaster arf Viperjet! 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 judgement 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 Viper
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 ‘failsafe’ 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 model was applied in or out of the mould.
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 ARF
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. Mould 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.
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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 FUELLED
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!
The wings and tails are very flight worthy structures. They are light and extremely strong , how-
ever, they will dent if mishandled. Always support these structures on clean soft foam rubber.
LIVE HINGE
Skymaster utilize this system of hinging control surfaces because it is a very strong
hinge system and is accomplished at the factory.
Occasionally, because of climatic changes, the bottom surfaces may “catch” or interfere with control travel surface actuation. Should this happen, use a fine abrasive strip
to further bevel the L.E. of the control surface.
CAUTIONS: Do not apply any primer or paint to the underside of the main surface trailing edge.
Prior to each flight, check that the ailerons and elevators actuate properly, up and
down.
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Assembly & Operation Manual
TOOL LIST
1. Perma-Grit sanding blocks
2. Perma-Grit small files
3. X-Acto Razor Saw
4. X-Acto hobby knife
5. Carbide Cutters (5/pk)
6. Set of ball end hex wrenches
7. Dremel Drum Sander
8. Dremel cut-off discs and mandrel
9. Dremel tool
10. A good set of small Phillips and slot end screwdrivers
11. Steel ruler
12. Pin vise to hold 1/16” drill bit
13. Soldering Iron
14. Solder
15. Cable ties
16. ZAP CA, epoxy, Aeropoxy
17. Microballoons
18. Resin mix
19. Polyester putty
20. Aeropoxy
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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 manufac-
turing 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.
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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!
We have used JR equipment during the installation process. If you make use of
another manufacturer, please use equipment with similar specifications!
The Viper will require extension leads! Please use high quality extension leads. Make
use of ceramic non ferrite cores if leads exceeds 1 meter.
The trend nowadays is to 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. The JR Matchbox or
Powerbox Royal makes this task very easy without using the complete radio system on
the work bench.
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...
P-8
Assembly & Operation Manual
COMPOSITE PARTS
1. Rear fuselage including hatch
2. Nosecone including landing gear and door
3. Canopy
4. Left wing including landing gear and doors
5. Right wing including landing gear and doors
6. Left stab
7. Right stab
8. Fin
9. Rudder
10. Winglets (pr)
11. Ventral fins (pr)
Photo 1
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Assembly & Operation Manual
OPTIONAL PARTS
3 x Air Tanks
1 x Retract Valve
2 x Filler & 2 x Pressure Gauges
1 x Brake Valve
5 x Air Tubing, 10 x Quick Disconnect
8 x T-pieces
Photo 2
Photo 4
Photo 6
Photo 7
Viper L/G feature oil damped oleos,
air inflatable tyres & brakes.
The L/G come factory assembled
and oleo pressure is factory set.
Fuel Tank
Fuel Accessories.
Viper Accessories
Airpower Optional 5 in 1 Electronic
Valve & Sequencer
Control Brake, Gear and Doors
Stainless Steel Tail
Pipe
Cockpit (2)
P-10
Photo 3
Photo 5
Photo 8
Assembly & Operation Manual
CONTROL LINKAGES
Photo 9
Flaps : 98mm
Aileron : 88mm
Elevator : 70mm
Rudder : 68mm
Steering: Cable
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.
The Arf Pro kit feature factory installed landing gears with doors. Please check operation of landing gear. Check all nuts and bolts and screws. We may have missed something. Mark √ each step.
Use Aeropoxy to glue LG blocks and LG
ribs to skin of wing or carbon cloth and
resin if you want to reinforce this area for
possible “not so good arrivals”. For normal
tarmac landings it is strong enough.
Check servo mounts. Use CA to glue ply-
wood if needed.
Check operation of Flaps and Ailerons.
Trim if needed. Make sure surfaces move
freely.
P-11
Photo 10
Assembly & Operation Manual
Fit 2 L-shape servo brackets to 2 x JR DS8411.
The 2 servo’s must be mounted back to back
with servo horns opposite each other.
Secure servo horns and centre servo’s with TX.
Secure 2 x extension wires. Use safety clips on joint.
Photo 11
Feed wire through ribs.
Secure servo’s to wing. Use 8 servo
screws.
Draw a line perpendicular to hinge line.
Use masking tape to mask off area around
control horns. This will help with inserting
glue in slots.
Mark location of horns. Make sure pivot
point is directly above hinge line.
Use Dremel to cut slot for control horns.
Use 30 minute epoxy to glue control horns
After epoxy cured, insert pushrods.
Photo 14
Photo 12
Photo 13
P-12
Assembly & Operation Manual
Cut slots in servo cover to clear servo horns.
Secure servo covers with 6 , 1mm set screws.
Fit and glue winglets to wing tips. (do this
after painting)
Photo 15
Trail fit both wings to fuselage. Bolt in posi-
tion and check operation of LG. Trim fuselage
if needed!
Repeat for other wing.
P-13
Photo 16
Assembly & Operation Manual
STABILIZERS
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 stabilizers simultaneously. Mark √ each step.
Inspect the hinge line and make sure elevator
operates freely.
Locate 2 x DS3301 servos and secure long HD
plastic servo horn to servo.
Connect both servos to RX and set up TX for
dual elevators. Centre both servos.
Photo 17
Mark location of servo horn. (Put servo on top of skin and mark location)
Cut hole in skin. Check servo horn moves freely. Draw line perpendicular across
hinge line.
Cut slot in root of elevator and fuselage to clear servo.
Note that servo horns must closets to TE.
Secure servos to plywood mounts. The back of servo will
exit stab root. Therefore a opening must be cut in fuselage.
Cut slot for elevator horn and glue in position. Make sure
pivot point on horn is direct in line with hinge line.
Photo 18
Run extension wires in harness and secure to form-
ers. Note: It is very important that wires do not touch
tail pipe. Use protective sleeve if you feel like it, although the prototype did not have.
If using Sullivan clevises you need to drill servo horn.
(standard holes will be too big and flutter will occur.
Use bearing links for best results)
Secure extension lead and servo wire with cable ties.
P-14
Photo 19
Assembly & Operation Manual
Insert stabilizer spars & bolt stabs in
position.
Fit pushrod.
Photo 20
Check operation of control surface and
adjust both elevators the same. (The
installation must be a mirror image of each
other)
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. Mark √ each step.
Photo 21
Mark location for servo horn on skin of fin.
Cut slot with Dremel tool.
Trial fit servo into fin & make sure all clear servo.
Mark location of rudder horn. Mask off area.
Cut slot for rudder horn and glue in position. Check
for free operation.
Photo 22
Install long servo horn and centre servo.
Secure extension wires inside fuselage. Make sure
no wires do touch tail pipe.
Trial fit fin and rudder. If happy glue rudder hinges
and rudder in position
P-15
Photo 23
Assembly & Operation Manual
Slide fin in position and secure with bolt.
Fit pushrod.
Check operation of control surface and adjust rudder
pushrod for centre.
Photo 24
VENTRAL FINS
NOTE: Make sure to have some sort of protective foam
on the work bench. This will protect the paint surface
from unwanted dents. Mark √ each step.
Dril 4 2mm pilot holes for ventral fins
Use aeropoxy and glue 2.5mm steel pins in position.
Mark locations for pins onto ventral fins.
Drill 4 2mm pilot holes into ventral fins.
Photo 25
Trial fit fins. Note the fins are shaped to fit fuselage. Make sure it aligns with the
panel line drawn on fuselage.
Mask off area both sides of each ventral fin. This will help not to get glue onto un-
wanted areas.
When happy use silicon glue and glue fins in position.
Align fins with turbine hatch. Make sure both fins sit at
same angle. (Note: If model unpainted do this after
painting)
Photo 26
P-16
Assembly & Operation Manual
FUSELAGE
Make sure you have a good stand for fuselage. Once the nose wheel and ventral fins are
installed it is very difficult to handle on a flat surface. You will need to assemble the rest
of the Viper on this stand. Note: Arf pro nosegear and doors are factory installed.
Photo 27
Photo 29 Photo 30
Photo 28
Locate the 4 x M5 bolts and washers for fuselage.
Align fuselage and secure with 4 bolts. Check fit
of canopy once the fuselage halves are joined.
Route all loose servo wires to nose. Secure wires with cable ties to formers. Also
install 2 x Aileron and 2 x Flap extension wires.
Install JR DS8411 steering servo.
Centre servo and install push-pull cable system.
Install springs or elastic bands to tension cable. This will help pull cable out of way
when noseleg is retracting.
Retract unit and check for clearance all around wheel.
P-17
Assembly & Operation Manual
Check operation of nose door and main doors in
fuselage.
Photo 31
TAIL PIPE
Dril holes in bellmouth of tail pipe.
Slide tail pipe in position. Note: The rear of pipe
must just exit the rear former by 10mm.
Mark location of screws on bellmouth mount.
Dril pilot holes for self tap screws.
Photo 32
Secure pipe in position and glue end of pipe with silicon glue to former.
Glue bellmouth with silicon glue.
Photo 33
P-18
Assembly & Operation Manual
FUEL CELLS
The fuel system is very important. A good installation will ensure trouble free operation
and no flame outs due to air bubbles. Make use of an air trap. We recommend BVM UAT.
Rinse tank and make sure no foreign objects from
manufacturing process stayed behind in tank.
Do a pressure test and see if tank is secure no cracks
on seam lines.
Mark the top of tank . Also draw arrows to show direction
Photo 34
of flow.
Make up fuel fittings. Make sure clunk will reach all corners of tank.
When you cut copper pipe, make sure to ream ends
for better operation.
Fit fitting to tank. Tighten bolt and do an air test. Make
sure no leaks are present. Do not over tighten bolt.
Silicon glue bottom tank to bottom of fuselage and
inlet duct.
Install UAT on bottom of fuselage in front of bottom
tank.
Plumb tanks with tygon tubing.
Photo 35
Fill and drain tanks! Check that no air are trapped in tanks. UAT must drain last and
stay full of fuel all the time during draining.
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Assembly & Operation Manual
FUEL CELL DIAGRAM
Photo 36
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Assembly & Operation Manual
TURBINE INSTALLATION
Please follow the instructions supplied
with your turbine.
Secure turbine to turbine rail via hatch
at bottom of fuselage. Leave gap of
25mm between NGV and tailpipe.
Run all turbine wires and power cables
on opposite side of servo wires.
Always secure all wires in harness. I
would suggest you install a FOD. This
will save you money in the long run.
Photo 37
Install fuel pump close to UAT. We recommend to make use of a mechanical shut
off valve as well.
Secure all Festo pipes with cable ties. Make sure fuel filter and gas canister are
mounted vertical.
Install NiCad or LiPo battery in nose next to LG. I always put a fuse holder inline
with power cable.
Locate 6 x 2mm screws to hold turbine cover in position.
Photo 38
Photo 39
P-21
AIR SYSTEM
Photo 40
Assembly & Operation Manual
Glue the air tanks with silicon behind the fuel
tanks. I have installed the 2 large tanks for
operation of gears ,doors and brakes.
Fit the 2 filler valves and 2 pressure gauges
onto accessory tray.
Plumb the landing gear, door and brake system
by using color air tubing. T all same color
tubing together until a single pipe emerge.
Route all 5 pipes to the accessory tray in front
of fuselage.
The air system will consist of :
Air up, Air down retracts (2)
Air up, Air down doors (2)
Air out brakes (1)
Air in (2)
Total of 7 pipes
Photo 41
Photo 51
Photo 42
There are 2 options available for the air system:
Mechanical Valves or Electronic Valves
For mechanical valves you will need
2 x 2 way valves and 1 x 1way valve
with 3 servos and sequencer.
The electronic EV5U will do all the
above in a single unit. This will make
installation much simpler and save
space.
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.
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Assembly & Operation Manual
For scale door installation the Viper require additional 2 way electronic valves. The
main doors in the fuselage will stay close before and after retraction. This can easily be programmed with EV5U.
Photo 44 1 way Photo 43 2 way
AIR DIAGRAM
Photo 45 Diagram for retracts
P-23
Assembly & Operation Manual
COCKPIT AND CANOPY
Paint inside of frame black or grey for
more scale look.
Cut rear cockpit front to fit over bulk
head. (47)
Photo 46
Photo 48
Photo 50
Cut rear cockpit to clear upper tank
fittings. (48)
Cut 2 slots in fuselage canopy frame to
slide front cockpit in place (50)
Glue balsa to front of fuselage (49) to
support front canopy.
Slide front canopy in position.
Slide rear cockpit on position. Trim to fit.
Use small 2mm self tap screws to secure
cockpits in position.
Photo 47
Photo 49
Photo 51
Photo 52
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Assembly & Operation Manual
EQUIPMENT INSTALLATION INTO VIPERJET
Equipment installation is a personal ven-
ture. There is one golden rule: Do it as
neat and logical as possible! This will
make faultfinding and service of components easier. The Viper basically consist
of 6 circuits!
1. Servo wires
2. Power cables
3. Data cables
Photo 66
4. Pneumatic pipes
5. Fuel pipes
6. RX cable
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.
Photo 67
Photo 68
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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 adjust measured at root.
1. Elevator 20 mm
2. Rudder 25 mm
3. Aileron 20 mm
4. Flaps take off 35 mm
5. Flaps landing 65 mm
NOTE : Make sure flaps travel same. Use Powerbox or Matchbox to match travel.
Flaps should be deployed in landing circuit only below 90mph
CG 25mm in front of main spar. This is slight nose heavy position for
maiden and strong winds. CG on main spar for experience pilots
only and windless days. Empty tanks, UAT full and wheels down.
Weight Dry weight will be between 20 and 24 lbs depending equipment.
PSI 80—100 psi for pneumatic system
Power Depends on your radio system. Make sure you have at least
double the amp required for a normal flight. Use a Hangar 9 meter
to check idle currents and extreme currents.
TX RX Do a complete range check before flight. Do this with turbine
running. Follow manufacturers instructions.
Speed Set the maximum speed to 180mph! The prototype were tested
with Jetcat P-80 and Kingtech K80E. More powerful turbines
require extra care and extra reinforcing.
Timer A timer can safe your model. Get into the habit of programming
the timer.
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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. Do not force a maiden flight!
Select take off flap or flight mode 1 and open throttle. Gently pull back on stick 40m
down the runway. The Viper will rotate gently and have no bad habits. Raise the flaps
and gear at safe altitude and let the model sit on rails.
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 80—90mph.
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. If you have a headwind be very careful not to get below the power curve on
the downwind side.
Align the model and use throttle to control the descent! The elevators will stay very active even at low speed. Flare the model just before touch down. Let the model roll out
and apply brakes. The Viper is an extremely forgiving jet to fly. The long wings and
good profile make it almost to easy. But it is still a 22lbs model and if it stalls it will
make a large hole in the ground.
Taxi back and do necessary adjustments to customize Viper for your need!
We at Skymaster wish you many happy flights with your Viper! Put some smoke and
landing lights and you will be centre of attention at your next air show!
Regards,
Anton Lin and Skymaster Team!
P-27
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