Pylon Racer aero naut F Order No.
FOXX is a powerful pylon racer. Building materials are mostly balsa and light-ply to achieve a light yet strong structure for maximum flying performance. Due to its considerable top speed this model is recommended for experienced pilots only. We use mostly laser-cut parts for maximum precision and to speed up the building process. Wing spars are spruce with sheet webs at the wing root for additional strength. Power is provided by suitable inrunners with a diameter of 28 mm.
R5 1 R1 R4 R 10 Protect your building board with cling film and position right fuselage side R 1 on building board. Attention: The fine lines indicating the position of the canopy need to be visible on the outside of the fuselage! Glue in place wing support R 10 together with formers R 4 and R 5. Make sure R 10 follows contour of wing cut-out exactly. Remove any glue from slot at rear end of R 10. Glue wing support R 10 to inside of left fuselage side R 2.
3 Chamfer lower edge of former R 6 to match installed positon behind former R 5 R 8/9 and temporarily insert in slots in right fuselage side behind R 5. Glue R 9 at an angle of 90° to servo tray R 8. Temporarily insert R 8/R 9 in slots in rigth fuselage side below R 6. Insert R 7 in slot at rear end of R 10. R6 R5 R7 R6 R9 R8 R 10 4 Position left fuselage side R 2 onto tabs of formers and check for proper fit. Then remove left fuselage side from formers.
Sand triangular stock at rear end of fuselage so that fuselage sides meet. Apply glue to R 6, R 8/R 9 and to contact surfaces of triangular stock, draw fuselage sides together and secure with clamps and/or pins until glue has dried. Attention: Make sure fuselage is absolutely symmetrical! 6 Select R 3 A or R 3 B for motor installation depending on the type of motor you use. Use R 3 A for 28 mm inrunners.
7 12 mm from the top drill rear end of fuselage with 2 mm for elevator control. Insert snake inner R 19 through rear end of fuselage and through horizontal slot in former R 9. Apply glue to pushrod housing at rear end of fuselage only and cut off flush with fuselage. Do not apply glue to slot in former R 9! R 19 8 Install elevator servo in servo tray and drill mounting holes for servo. Install pushrod connector R 25 to servo horn and install servo. Note that servo horn faces forward in installed position.
R 20 9 Carefully sand top and bottom contact surfaces of fuselage, then sheet top and bottom of fuselage with R 20 (3 mm balsa), grain crosswise. Attention: Do not sheet contact surface of tailplane! R 20 10 i Sand front of fuselage flush with R 3 (A or B) and glue in place R 11 A or R 11 B (1 mm birch ply), depending on type of motor.
11 Carefully sand fuselage and round off the edges. cut here With a razor saw cut out canopy along the lines indicated on fuselage sides. cut here 12 Glue together fin parts R 14 and R 15. R 16 is added to fin after model has been covered.
13 Bevel off front edge of elevator R 13 to R 17 allow for sufficient control throw, then glue in place control horn R 17. Attention: Note orientation of control horn. The vertical edge faces aft! R 13 When dry, sand front edge of control horn flush with front edge of elevator. R 12 14 Glue fin in place on tailplane R 12 and make sure fin is at an angle of 90° in relation to tailplane. Reinforce joint with R 22 (6×6 mm triangular stock) on either side.
15 Fit together the two-piece wing jig and secure to building board with tape. F1 16 Glue together two centre ribs F 1. Then insert ribs F 1 to F 10 into jig. If necessary, tack-glue tabs to building bord with a drop of glue to secure ribs.
17 F 12 F 11 Glue in place upper wing spar 11 (5×2 mm spruce). Make sure all ribs are upright and fully seated in jig. Glue leading edges F 12 (4×4 mm obechi) to front of ribs. Insert pins in front of leading edes into jig to hold leading edges in position. F1A 18 Glue riblets F 1 A to centre ribs F 1, two riblets either side.
19 Glue in place top wing sheeting panels F 13 and F 14 (1.5 mm balsa). Fit and glue in place F 13 first. F 13 Attention: The rear end of F 13 must coincide with centre line of wing spar. Remove residual glue immediately to provide a good contact surface for F 14. F 14 20 When glue has completely dried, carefully remove wing from jig and turn upside down. Cut off tabs with modeller´s knife or razor saw and sand lightly.
21 Fit and glue in place webs V 1 to V 3 between ribs F 1 to F 4. Glue in place lower wing spar F 11 (5×2 mm spruce). Glue servo trays F 15 in rib bays between ribs F 3 and F 4 to upper spruce spar and to top sheeting. V2 F4 V3 V1 F 11 Align servos parallel with rear edge of wing and glue in place on servo trays. F 15 F3 F1 22 Into rear sheeting panels F 14 cut slots for servo horns and openings for servo leads as shown. F 13 Glue in place sheeting panels F 13 and F 14.
F 17 23 Carefully sand rear edge of wings flush with ribs. Trial-fit trailing edges F 16 and cut contact surfaces at wing centre to appropriate angle. Then glue trailing edges in place and secure with tape. Carefully sand top and bottom wing sheeting flush with end ribs. Wing tips consist of 4 pieces F 17 each. Glue together, then glue to end ribs. When dry, sand wing tips and leading edge to shape and give complete wing a smooth surface.
25 Position wing on fuselage and align centre lines of wing and fuselage. Drill with 4 mm through wing and R 7 for M4 wing bolt F 19. Redrill R 7 with 5 mm. From below insert nut R 24 in R 7 and glue in place with epoxy. R 24 i Note: Bottom view; fuselage side panel omitted for clarity. R7 26 Glue reinforcement F 21 (1 mm birch ply) to top side of wing. Make sure that holes in wing and reinforcement match perfectly.
With soft pencil mark ailerons on trailing edge: aileron cut-outs start 50 mm from centre line of wing. They are 210 mm long and 18 mm deep. Cut out ailerons with modeller´s knife and razor saw. 18 mm 27 210 mm F 20 28 Bevel off front edge of ailerons to provide for sufficient control throw. Cut slots for control horns F 20 into ailerons and glue control horns in place.
Finishing Give the whole model a final sanding and cover it with the covering material of your choice. Use bright and contrasting colours on top and bottom of wing. This makes it easier to identify the model in the air. Check that contact surface for tailplane on fuselage is absolutely even. Position wing and tailplane on fuselage and make sure they are parallel. Remove covering film from contact surface of tailplane and glue tailplane in place.
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