4. Middle section of the wing
No.
Designation
Quantity Material
Dimensions
Comments/plate
TM-01
Main spar
1
Pine
3 x 10 x 220 mm Square strip
TM-02
Shear webbing, bottom
1
Poplar
3 mm
Laser-cut part 4
TM-03
Spar, bottom
1
Poplar
3 mm
Laser-cut part 4
TM-04
Middle rib
1
Birch
3 mm
Laser-cut part 6
TM-05
Rib
2
Poplar
3 mm
Laser-cut part 4
TM-06
Outer rib
2
Birch
3 mm
Laser-cut part 6
TM-07
Shear webbing, top
1
Poplar
3 mm
Laser-cut part 4
TM-08
Nose board
1
Poplar
3 mm
Laser-cut part 4
TM-09
Main spar
1
Pine
3 x 10 x 220 mm Square strip
TM-10
Landing gear bearing
2
Poplar
4 mm
Laser-cut part 5
TM-11
Landing gear borehole
1
Poplar
4 mm
Laser-cut part 5
TM-12
Landing gear vertical
8
Poplar
4 mm
Laser-cut part 5
TM-13
Connecting tube
2
Brass
9/8 x 110 mm Finished part
TM-14
Doubler magnet, front
2
Poplar
3 mm
Laser-cut part 1
TM-15
Doubler magnet, rear
2
Poplar
3 mm
Laser-cut part 2
TM-16
Panelling, top
2
Balsa
1.5 mm
Board section
TM-17
Panelling, bottom
2
Balsa
1.5 mm
Board section
TM-18
Leading edge
2
Balsa
10 x 20 x 65 mm Square strip
4.1
The middle section of the wing is put together separately from the fuselage and only stuck together
with the fuselage in a separate step. It is important to have an even surface that is covered with cling
film. Important: Steps 4.3 to 4.6 inclusive are now completed in one go, without waiting for the glue to
dry.
4.2
The main spar TM-01 is fitted and the lower shear webbing TM-02 stuck in the middle. In the same
step, the rear spar TM-03 is arranged.
4.3
Now the middle rib TM-04 is stuck on, aligned exactly at right-angles and fixed onto the building board.
4.4
This is followed by ribs TM-05 on the left and right of the middle rib, followed by the outer ribs TM-06.
The inclination should be noted here, which is determined by the shear webbing and the spar.
4.5
Now the upper shear webbing TM-07 is stuck on immediately, followed by the nose board TM-08 and
the main spar TM-09. This makes for a stable structure, which is aligned at right-angles and fixed in
place until it dries.
4.6
The bearing for the landing gear consists of the following parts: 2x TM-10, 1x TM-11 and 8x TM-12.
For the adhesion, it is helpful to have two 4 mm threaded screws to hand so that the borehole does not
slip. No plastic screws or beech wood dowels can be used here.
4.7
In this way, four T-12s are stuck over one another to form a small pack. This is done twice. Both packs
are then stuck onto T-11. A distance of 3 mm is kept between the packs, which is where the middle rib
will be located later. In the same step, the two T-10s are stuck together. Only in a later step will the two
T-10s and the packets from T-11 and T-12 be stuck together. The edges of this unit are then ground
flat and pressed into the rib cut-outs.
4.8
Connecting tubes TM-13 are coarsely roughened, fitted into the boreholes and stuck together using
two-component adhesive. They meet exactly in the middle of the middle rib. File the hems of the pipes
so that they are slightly bevelled.
4.9
The rib doublers TM-14 and TM-15 for the subsequent magnet protection are stuck in from the inside
behind the two 8 mm boreholes. Please do not apply too much glue – the boreholes must remain
clean.
4.10
Now comes the moment when the fully constructed middle section of the wing is stuck onto the fuse-
lage. It is gently inserted into the cut-outs and carefully pushed in until the stop point. The rear cut-outs
in the ribs are staggered in height increments of 3 mm so that adhesive can be applied from the inside
and the outside. Glueing only begins once the middle piece has been completely inserted and aligned.
Low-viscosity superglue is the top choice here.
4.11
Now you can finish the panelling of the fuselage base. Once again, segments with transverse fibres
are cut from building board R-22 and stuck on.
4.12
The upper and lower panelling (TM-16 and TM-17) is also attached to the middle section of the wing
and two short pieces of leading edge TM-18 attached.
4.13
Finally, the outer ribs are ground flat and two cover ribs TF-48 glued on.
4.14
The servo board R-32 is glued directly beneath the rear cockpit cut-out, between the side walls of the
fuselage. Use the height of the drive levers of the servo to determine the height of the servo board so
that the linkages can reach without bending.
4.15
Directly beneath the engine bulkhead, right at the front of the FR, is the battery resting board R-33. It
is supported by two struts R-34.
