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CNC Hager Impala Building Instructions

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Building Instructions
Congratulations on your purchase of the Impala, and many thanks!
You are now the owner of a high-quality product "Made in Germany" by the CNC Hager company.
Please read right through these building instructions before starting construction, and follow the
sequence carefully when building.
General 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 : Graupner DES 427 BB digital
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
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Summary of Contents for CNC Hager Impala

  • Page 1 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.
  • Page 2 Caution: take care to produce a handed pair of fuselage sides (left and right)!

  • Page 3: Fuselage Construction

    Fuselage construction - 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. - Glue the lower fuselage longeron R1 (4 x 4 mm balsa strip) to the fuselage side R2, flush with the outside edge.
  • Page 4 R14a R14b (R24a) (R24b)
  • Page 5 - Glue 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.
  • Page 6 These radii should be identical! R28a R29b R29a R29b R28b R30b R30a R30b R31b R31a R31b Up to 1.5° acceptable e.g. spirit level or similar...
  • Page 7 - 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.
  • Page 8 2 mm Ø steel rod or drill bit...

  • Page 9: Wing Construction

    Wing construction - 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...
  • Page 10 F4-6 F1-3 Choose your preferred linkage position: top or bottom Caution: be sure to build one R.H. and one L.H. wing! Rubber bands...
  • Page 11 ! The following steps should initially be carried out “dry” (no glue)! - Carefully assemble the inboard section of the wing, consisting of parts F1 - F3, F4 - F6, F7, F8 and F9. ! De-grease the aluminium tubes F9, and roughen the surface with abrasive paper.
  • Page 12 90 degrees Underside F21 F22...
  • Page 13 - It is important to check the wings very carefully before gluing the joints. - Slide both wings onto the joiners R33. - Locate two identical parts F18 and support the wings on them at the l eading and trailing edges to check that the wings butt up correctly against the fuselage;...
  • Page 14 1,5 mm clearance 1,5 mm clearance...
  • Page 15 - Trim the root trailing edges F27 to fit the wings, then tack them in place with a little cyano. Compare both wing panels before finally gluing these parts in place using thin cyano. ! The trailing edge must continue the wing section accurately (see Fig. 20). It is very important that the trailing edge should not be set at a negative (down) angle, as the model would then have a marked pitch-down tendency in the air.
  • Page 16 Round off edges Round off edges 1.0 mm steel rod Servo end Control surface end 1.0 mm steel rod...
  • Page 17 Completing the basic airframe - Round off the edges of the tip fins F28. - Assemble the model temporarily, and carry out any minor corrections required. - Fit output arms on the servos, centre them from the transmitter, and install them in the wings.

  • Page 18: Centre Of Gravity

    Centre of Gravity Measured from the rear face of the trailing edge. See plan view. Elevon settings: (as seen from the tail) Elevator (up) 7 mm 7 mm Elevator (down) 5 mm 5 mm Aileron (left) Expo approx. 50% 5 mm 5 mm Aileron (right) Expo approx.

  • Page 19: Final Assembly

    Covering and completing the model - Thread the 50 cm extension leads (not included) through the wings. - When you are confident that everything is in place and all the fits are correct, it is time to cover the airframe using the material of your choice (all the test models were covered with Oracover).
  • Page 20 - Adjust the recommended elevon travels at your own discretion to suit your personal preference. Landing: ! Carry out a few “dry runs” before the first landing, to get a feel for the Impala’s very shallow glide angle. - Fly a wide, low approach at quarter-throttle and cut the motor early on the final leg, as the model will glide a very long way even without motor power.