TB Model 120mm Viper Jet

OWNERS MANUAL

Thanks for purchasing one of our fina ARFs. It is very

straightforward to assemble, but it is not meant for

first-time builders. You are expected to have certain

basic modeling skills...if not, GET HELP.

This airframe was designed, stock, for power up to 1300

watts or so, and scale-like flying. If you want to use a lot

more power, or fly very hard, you should think about

beefing it up a bit.

You could easily push this model above 150mph, given

enough power(or a turbine engine), but the design was

not set up for that without modifications. Get

experienced help, and build accordingly.

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Cut open the two servo bays. Use a nice new blade.

Glue the hinges into place. The best way is to remove

each hinge, then put two pins into the centerline of each

hinge, then put the hinges into place, then remove the

pins, then glue them. This keeps the hinges from sliding

too far into one surface or another.

Organize your wing servo covers, cut the holes for the

control horns.

Fit your servos to the covers, using the provided blocks.

You can modify the blocks as you see fit to suit your

servos.

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Add appropriate extensions as needed, tape these

extensions for safety, use 2 pieces of hardwood for the

servo.

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Fit the aileron servos into place. Use a wire with a hook

on the end to fish the servo lead out the hole in the wing

root.

Drill holes for the servo cover mounting screws.

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Fit all the servos into place with screws.

Prepare four servo horns as shown.

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Fit the pushrods and use them to determine the location

of the control horns.

Shoot a bit of CA accelerator onto the spots where the

horns will go.

Tack glue the horns into place with CA.

Drill holes for the mounting bolts.

Screw the horns into place.

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Glue the wingtip into place.

Fit the wing tubes to the wings.

Test fit the wings onto the fuselage, add the carbon

fiber antirotation pins. Adjust the wing alignment

carefully. Use screw to install the wing to the fuselage,

then the wing can be removed.

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Carefully fit the stabs and the stab tube. When satisfied

with alignment, then remove any paint from the mating

surfaces on the fuse, and epoxy the stabs into place.

Glue the elevator hinges into place with CA.

Fit the elevator servo. Use the same techniques as the

wing servos, don’t forget the extension for it.

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Cut open the servo bay for rudder. Use a nice new blade.

Carefully fit the Vertical and the vertical tube. When

satisfied with alignment, then remove any paint from the

mating surfaces on the fuse, and epoxy the vertical into

place. Fit the Rudder servo. Use the same techniques as

the wing servos, don’t forget the extension for it.

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Install the main landing gear.

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Install the nose gear and strut.

Install a servo for nosegear steering.

Link up the steering with monofilament fishing line. Use

nyrod tubes, glued at one end as shown, to add some

pressure to keep the steering cables taut as the gear

retracts, so they do not tangle with the nosegear. Study

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the picture for a few minutes.

‘

Install the nose gear retract door.

Glue the upper tray into position. Do a good job here, as

your batteries will be held on this tray.

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Install the nose part of fuselage to the fuselage with

screw.

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Install the canopy to the fuselage

Spray the aft end of the tail cone silver for better

appearance.

Mount up your fan, screw it to the rails and then mount

the fan cover.

Fit the tail cone to the fan, and make a hole for the ESC

or motor wires.

The fan hatch is fit in place with screw. You can add a

little clear tape if it makes you feel better, too.

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Add your receiver and wiring.

Balance is 2CM forward of the main spar.

Throws are:

Elevator 1cm up, 1cm down

Ailerons 1cm up, 1cm down

Rudder as much as you can get

Nosegear steering, 1/4” each direction.

Flaps, 1” down.

The Viper jet is very easy to fly, just don’t try to horse it

off the ground, let it gain speed before climbing out.

Landings, keep some power on, and fly it down onto the

runway. Do not try to “flare” it, there is no reason to stall

the plane, just fly it down onto the runway. Don’t attempt

to land it with no power, you will likely tip stall it and

kill it. Good luck and happy flying.

UnReg

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