Vmar Challenger 40ARF Trainer Assembly And Operation Manual Download Page 9

Page: 9 / 32

VMAR CHALLENGER 40ARF TRAINER

2.2.10

Check the entrance to the wing spar joiner

cavity in the wing roots. There may be "flashing" or a thin
skin of wood covering the entrance to the cavity which
should be removed carefully with a sharp hobby knife.

2.2.11

Holding the wing spar joiner in your right hand

and right way up like a broad V slide the wing spar joiner
firmly and carefully into the wing spar joiner cavity
("hole") in the root of
the left wing. Push
firmly and carefully
until the wing spar
joiner is inserted into
the left wing up to the
pencil mark at the apex
of the V.

2.2.12

Holding the left wing firmly in place on the

table with the top side up, take the right wing and care-
fully position the right wing spar joiner cavity onto the
end of the wing spar joiner protruding from the left wing.

2.2.15

Carefully and firmly slide the right wing towards

the left. Wiggle the wings slightly to encourage the two
wing alignment dowels to mate with their respective
receiving holes in the opposite wing root.

2.2.16

Carefully and firmly continue to slide the right

wing towards the left until the wing roots touch. Push the
wing halves firmly together and apply masking tape
across the joint to keep the wing roots aligned and firmly
in contact with each other. Apply masking tape top and
bottom and along the joint.

2.2.14

Slide the right wing firmly and carefully onto

the wing spar joiner until the wings are about 25 mm (1
in.) apart. Stop at this point and examine the wing as-
sembly. You should see that the wing when bottom side
up, takes on a slight inverted V shape with tips sweeping
downwards. You should also note that the two short wing
alignment dowels are lining up with two receiving holes in
the opposite wing root.

2.2.17

Continue working with the wing turned over so

that you are looking at the bottom of the wing with the
leading edge facing away from you and the ailerons
closest to you.

2.2.18

Take the fuselage

[FS]

out of it's protective bag

and locate four of the plastic wing bolts

[WB]

from the

wing parts bag. Lubricate the wing bolts with a light
grease or a very light coating of candle wax and screw
the bolts into the wing mounting blocks in the fuselage.
Go slowly, winding the bolts in a bit, back them out, add a
bit more lube and then screw them in further in stages.
You will note that it becomes easier as you go. Using a 4
way wrench on the socket heads of the bolts makes it
easier but a flat bladed screw driver will do the job.

2.2.13

Turn the wing halves over so that you are looking

at the bottom of the wing halves with the leading edge facing
away from you and the ailerons closest to you.

If the wing bolts appear to be unduly tight in the blocks
when you try to screw them in, do not force the issue.
Back the bolts out and “chase” the threads in the
mounting blocks with a 1/4-20 NC tap. You can purchase
these at most hardware stores or visit your local hobby
retailer. Thread the tap lightly and gently into the threaded
holes and twist it carefully until it engages with the
threads and then turn the tap through the block and back
it out again.

2.2.19

Remove all the wing bolts from the fuselage.

2.2.20

Examine the four wing bolt holes in the wing.

Use a sharp hobby knife to carefully cut away the covering
that has been applied over the holes on the bottom of the
wing.

LEFT

WING

TOP SIDE

RIGHT END

OF WING

SPAR

JOINER