CNC Hager Impala Manuale di istruzioni
1
Congratulations on your purchase of the Impala, and many thanks!
You are now the owner of a high-quality product “Made in ermany” by the CNC Hager company.
Please read right through these building instructions before starting construction, and follow the
sequence carefully when building.
eneral information on the model :
The IMPALA is a high-speed delta of orthodox all-wood construction, with some carbon fibre parts.
Its outstanding features are its sleek appearance, CNC-cut parts and its very broad speed range:
the Impala is a stable flyer at both low and high speed, and it offers straightforward, reliable
handling in every aspect of flight. The wings are of built-up construction, featuring strong CFRP
spars. The control surface travels stated in these instructions have been tested by us, and are
safe basic settings for your initial flights. Naturally you are free to fine-tune them to suit your
personal preference.
Construction :
Formers, fuselage sides, ribs etc. are of interlocking design, as this makes the model much easier
to build. The CFRP wing spars provide adequate airframe strength at high speeds.
The test models were finished in Oracover iron-on film.
RC equipment :
Motor :
see www.hoelleinshop.com
EDF unit :
Wemotec Mini Fan PRO
Servos :
raupner DES 427 BB digital
Building Instructions
All rights reserved. Copying and commercial exploitation of these building instructions is prohibited. Be aware that
any modifications to parts and materials are at the builder’s discretion and risk. We accept no liability for consequent
damage resulting from unsuitable modifications to parts and materials, or from inappropriate flying, especially where
our models are subjected to excessive flight loads. Such consequences are not covered by the guarantee, and we
accept no liability since we are unable to monitor the quality of construction and the methods you use to operate the
model. The accessories, RC components and power system stated on the plan are only our recommendation.
Technical information, especially in respect of flying weight, may vary according to your construction methods, and
cannot be guaranteed. These building instructions are an integral part of the product. If you ever transfer the model
to a third party please be sure to pass on the instructions to the new owner
1
2
3
4
R1
R2
R3
R33
R1
R1
R4
R5
R6
R7
2
Caution: take care to produce a handed
pair of fuselage sides (left and right)!
R9
R8
5
- When preparing the fuselage sides be sure to produce a handed pair, i.e.
one R.H. and one L.H. side. Each step should be repeated with the
second fuselage side.
- lue the lower fuselage longeron R1 (4 x 4 mm balsa strip) to the fuselage
side R2, flush with the outside edge.
- Fit the formers R4, R5 and R6 and the bottom panel R7 in one fuselage side.
! Lightly sand the former tabs if they are a tight fit, to avoid damage to the
fuselage doublers R3.
- Lay this assembly on a flat surface, and fit the second fuselage side on top.
The bottom panel R7 helps to align the formers correctly.
- Check that the fuselage sides, formers and bottom are straight and undistorted,
then glue the parts together.
4
Fuselage construction
1
- Offer up the fuselage doubler R3 and trim it to fit if necessary before laying
it on the fuselage side R2. Position it carefully, using the CFRP tubes R33
or a 5.9 mm Ø drill to aid alignment, and glue it in place using high-viscosity
(thick) cyano adhesive.
2
- lue the remaining fuselage longerons R1 to the fuselage side.
- Lay the fuselage sides together, aligning them with the CFRP tubes R33,
and lightly sand the outside shape.
3
3
- lue together the two towhook plates R8 (2.0 mm light ply) before gluing
them to the underside of the bottom panel R7.
- Fit a large washer on an M4 screw, and use it to pull the captive nut R9
into the bottom panel R7 and the towhook plates R8. Press it firmly into
place and glue it securely.
5
6
7
8
R10
R18
R26
R25
R12
R13
R11
R14
R15
R16
R17
R23
R22
R1
R20
R14a
R14b
4
R21
R19
(R24a)
(R24b)
- lue together the two parts R10 (2.0 mm balsa) to form the rear top fuselage
deck. Weight the fuselage down on a flat surface before gluing the deck in place.
- Fit the tail former R11, and glue it in place.
- Sand back any projecting edge of the top deck R10 so that it ends flush
with the former R6.
- lue the in-fill block R12 (8.0 mm balsa) in place, followed by part R13
(2.0 mm balsa).
- Prepare the two removable hatches by gluing together parts R14a + b and
R24a + b (2.0 mm balsa). These hatches are required later to help you position
particular components correctly.
- Fit the hatch R14 against the former R6, then glue the bottom panel R15 in
place, keeping it central. Take care not to glue the hatch R14 in place at the
same time.
- lue the two bottom panels R16 and R17 to the fuselage as shown.
- lue the rear bottom panel R18 in place, clamping two pieces of paper
between the hatch and R18; the paper is approximately the thickness of the
covering film, and helps to prevent the hatch jamming when covering is complete.
- lue the doubler R19 (0.6 mm plywood) to the inside of R18.
6
7
- Fit the formers R20 and R21 between the fuselage sides, but only glue R21 in place
at this stage; this makes it easier to correct any distortions which may become
apparent later.
- Lay the fuselage on one side, and measure the height of the former R21 above the
building board.
- Turn the fuselage onto the other side, and measure the height again.
- If there is a difference between the dimensions, carry out any corrections required.
- lue the bottom panels R22 and R23 to the fuselage, taking care to avoid warps or
twists in the structure.
- The formers R20 and R21 can now be glued in place permanently.
- If the former R4 tends to bend under the pressure from the fuselage sides, add a
stiffener to reinforce it; this can be cut from the R1 material (4 x 4 mm balsa strip).
- lue the remaining top decks R25 and R26 in place using the battery hatch as a
positioning aid. Use the same procedure as described for the rear hatch R14.
8
5
9
10
6
11
Mini Fan Pro
R29a
R30a
R31a
R29b R29b
R30b
R31bR31b
R30b
R28a
R27
R28b
These radii should be identical!
e.g. spirit level or similar
Bottle
90°
Up to 1.5° acceptable
- Assemble the noseblock from all the parts R27 (8.0 mm balsa) before gluing
the block to the fuselage, correctly centred.
! Note the shape of the nose as shown in the side elevation.
- Assemble the tail block from all the parts R29a + b (12.0 mm balsa) before
gluing the block to the tail end of the fuselage, correctly centred.
- The concave radius of the tail block should now be sanded to follow the
radius of the former R11.
! Use abrasive paper wrapped round a bottle or can for this.
! Take care not to sand or modify the support surface for the fan unit.
9
7
- Temporarily attach the two fuselage hatches with two very small drops of cyano
(unless they stay in place by themselves) before sanding the whole fuselage smooth.
- The whole of the outside of the fuselage and tail block should be sanded to the
profiles shown in the cross-sections on the plan.
! In the area between cross-sections E and F the concave radius in the fuselage top
deck must match the inlet lip of the fan unit, to produce a smooth transition to the
fan unit at section F.
- Sand the fan shroud assembly to final shape before gluing it to the fuselage, taking
care to keep it central and straight.
! The fan unit must be aligned at 90° to the wing section (airfoil).
! It is essential to avoid a negative angle (thrustline) at this point. It is better if the
front part of the fan shroud dips slightly into the fuselage (positive thrustline,
max. 1.5°).
- Use abrasive paper wrapped round a bottle to sand back the air intake area of part
R12 (sections E - F) to produce a completely smooth transition.
! The diameter of the bottle must be the same as the inside diameter of the fan unit
(see Fig. 10 and sections A - ).
11
- lue together parts R29a + b, R30 a + b and R31 a + b (1.5 mm balsa) to
produce the three shroud panels as shown, and sand the joint surfaces
carefully on both sides.
- Carefully wrap the shroud panels R29 and R30 round the fan unit “dry” (no glue),
and tape them in place.
! It is a good idea to moisten the wood to ensure that it will bend without breaking.
- Start this procedure with the bottom of R29, curving it upwards until the two ends
touch. You may need to trim the ends according to the thickness of the wood.
- Fit R31 on the inside to produce a smooth transition.
! It is important that all the curved shroud panels align correctly at the bottom and
the front, and end flush with each other.
- When you are confident that all the parts fit correctly, repeat the procedure,
gluing the parts together with cyano adhesive.
- Sand the inlet lip and the rear part of the fan shroud to the profiles shown
on the plan.
10
12
13
F1
F2
F3
F4
F5
F6
2 mm Ø steel rod or drill bit
F9
8
- Please read right through the next steps very carefully, as they contain very
important information on the correct method of building the wings. Repeat
each step for the second wing panel.
- The root rib (consisting of F1, F2 and F3) is assembled using two lengths of
2.0 mm Ø steel rod or drill bits to aid alignment before the parts are glued
together.
This is the procedure:
- Assemble parts F1 - F3 in the correct sequence using the steel rods. If
everything fits properly, repeat the procedure using cyano adhesive, but
take care to avoid glue running onto the steel rods. At the same time keep
the glue away from those areas where the leading and trailing edges will
be attached, as this could affect the fit of the parts.
! The alignment holes in F1 - F3 are necessary in order to set the correct
offset of the holes for the aluminium tubes. This ensures that the root ribs
butt up neatly against the fuselage sides.
- Assemble the support ribs F4, F5 and F6, using exactly the same procedure
as described for the root ribs F1 - F3. In this case fit the aluminium tubes F9
through the holes.
! Don’t allow adhesive to run onto the aluminium tubes or the joiners.
12
13
Wing construction
9
14
15
16
Choose your preferred linkage position: top or bottom
Caution: be sure to build one R.H. and one L.H. wing!
F16
F17
F10 F11 F12 F13 F14 F15
F9
F8
F1-3 F7 F4-6
Rubber bands
10
Indice
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