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Approach Engineering AH-1F Cobra Electric Assembly Manual & User Manual

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A H - 1 F C O B R A
E L E C T R I C
APPROACH E GI EERI G
www.ApproachEngineering.com

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Summary of Contents for Approach Engineering AH-1F Cobra Electric

  • Page 1 A H - 1 F C O B R A E L E C T R I C APPROACH E GI EERI G www.ApproachEngineering.com...
  • Page 2 If a step or photo appears unclear to you inspect the CD for additional photos with different views to aid in assembly If you have any questions, comments, or improvements please call or write to: Approach Engineering Ridgecrest, Ca. 93555 www.approachengineering.com...

  • Page 3: Fuselage Assembly

    6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS Punch out the four 3/32” fuselage side pieces for each side. Place the completed assemblies of the fuselage side frames Assemble the side frames, (S-1, S-2, S-3, S-4) over a piece of and lay them out to build a right and left half.
  • Page 4 6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS Turn the fuselage over and epoxy the 1/4” light ply fuse- Turn the fuselage assembly over and glue the four 1/2” by lage bottom to the inside of the fuselage sides. Punch out the 1.5”...
  • Page 5 6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 6.13 6.14 Punch out the two 1/8” light ply vertical fin supports and Assemble the two belt idlers pulleys as shown. The two tail rotor tube supports (TSR). The rounded edge of the tail chamfered edge of the pulleys should face inward to help guide rotor tube support faces foreword.
  • Page 6 6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 6.19 6.20 Cut out the 1/8” ply trailing edge former (TE-2) and glue Pull out the larger diameter, longer, tail rotor tube with it into the notches provided on the top of the vertical fin assem- the four vertical cuts in one end.
  • Page 7 6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 6.25 6.26 Make two sets of filler blocks by gluing one filler block Working at the lower rear of the tail boom, trial fit the side, FBS and one FBM to build a right and left. Make a vertical filler blocks to ensure a good fit.
  • Page 8 6.0 FUSELAGE ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 6.31 6.32 Using 3/32” balsa cross sheet the upper and lower sur- Punch out the 1/8” ply canopy backing plate, CBT, and faces of the nose. transmission backing teeth, TBT. Matching up the profiles glue them to the back of the fuselage doublers.
  • Page 9 OSE A D TSU (TELESCOPI G APPROACH E GI EERI G SIGHT U IT) ASSEMBLY AH-1F ELECTRIC MECHA ICS Sand the face of the fuselage assembly flush with F-1. To aid in sanding draw lines on the lower surface and the Glue on the two 1/4”...
  • Page 10 OSE A D TSU (TELESCOPI G APPROACH E GI EERI G SIGHT U IT) ASSEMBLY AH-1F ELECTRIC MECHA ICS Sand the nose blocks flush with the top of the cross sheet- Punch out six 1/4” balsa telescoping sight units. Make two ing on the fuselage nose.
  • Page 11 8.0 CA OPY ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS Punch out the 3/32” balsa canopy sides and the 1/8” lite Using the printed reference lines as a template, cut 1/4” ply canopy guide teeth (CGT). Lay out the parts to build a right triangle stock (TRI-4) to fit between C-1, C-2, and C-3.
  • Page 12 9.0 E GI E A D TRA SMISSIO APPROACH E GI EERI G BAY ASSEMBLY AH-1F ELECTRIC MECHA ICS Glue the 2” long by 3/4” triangle stock to the upper edge Punch out the 3/32” transmission sides and the 1/8” light ply transmission guide teeth (TGT).
  • Page 13 9.0 E GI E A D TRA SMISSIO APPROACH E GI EERI G BAY ASSEMBLY AH-1F ELECTRIC MECHA ICS Position the 1/4” balsa trans top pieces, T-TOP, together so Making sure to build a left and a right engine intake posi- that the part labeling is close together in the center.
  • Page 14 9.0 E GI E A D TRA SMISSIO APPROACH E GI EERI G BAY ASSEMBLY AH-1F ELECTRIC MECHA ICS 9.13 9.14 Flip the assembly over and apply the same angled surface Sand a rounded profile along the lower edge only of the on the inside back edge of the supplemental intake.
  • Page 15 9.0 E GI E A D TRA SMISSIO APPROACH E GI EERI G BAY ASSEMBLY AH-1F ELECTRIC MECHA ICS 9.19 9.20 Sand the upper surfaces of the transmission assembly to Place the transmission assembly on the fuselage assem- the desired rounded finished shape. Sand a rounded profile and bly to ensure a proper fit.
  • Page 16 9.0 E GI E A D TRA SMISSIO APPROACH E GI EERI G BAY ASSEMBLY AH-1F ELECTRIC MECHA ICS 9.25 9.26 Using a knife, razor, or Dremel cut out the material be- Glue the doghouse on the top of the transmission assem- tween the doghouse edge pieces.
  • Page 17 10.0 WI G ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 10.1 10.2 Punch out the 1/8” light ply wing spars and the 3/32” Using the laser cut 3/32” lower wing sheeting, sand a wing ribs W-1, W-2, and W-3. Referring to the Appendix, glue small angle to the leading edge to match the angle of the leading the ribs to the wing spar.
  • Page 18 11.0 ROCKET LAU CHER ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 11.1 11.2 Take out the two rocket launcher tubes. Carefully cut out Punch out the 1/8” lite ply rocket launcher stabilizers the four 1/8” light ply rocket launcher faces. Position the rocket (RLS) and the ¼”...
  • Page 19 12.0 TOW LAU CHER ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 12.1 12.2 Punch out four ¼” balsa wing tips (TLS), and two ¼” Sand the wing tip assembly to the desired finished shape. balsa wing tips centers (TLC). Glue one balsa wing tip center on each side of the wing tip center.
  • Page 20 13.0 20mm CA O ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 13.1 13.2 The 20mm gun can be made to rotate with the use of a Using left over 1/16” balsa, cross sheet the gun supports. servo. Parts are included for this option. Punch out the 1/8” lite Run the grain perpendicular to the gun side supports.
  • Page 21 13.0 20mm CA O ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 13.7 13.8 Feather one end of the chin blocks down to about 1/8” on Position the gun chin blocks to the lower nose cross the one end.. sheeting and mark the position.
  • Page 22 14.0 FI AL ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 14.1 14.2 Trial fit the transmission assembly on the fuselage. You Glue the 1/8” light ply vertical fin trailing edge former will note that the tabs on E-2 extend down the side of the fuse- TE-1 into the slots provided.
  • Page 23 14.0 FI AL ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 14.7 14.8 Mark lines ¾” from the tail boom corners on the sides, Using various grits of sandpaper round the tail boom and top, and bottom to aid in sanding. You will want to sand a lower fuselage corners to a rounded shape.
  • Page 24 14.0 FI AL ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 14.13 14.14 Sand the corners of the chin block to their final rounded Cut out the sheeting in the center notch of CB-4 to al- low the Wire Strike Protection System (WSPS) to extend through.
  • Page 25 15.0 VERTICAL FI COVERS APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 15.1 15.2 Punch out the two 1/8” ply vertical fin leading edges, Punch out the upper leading edge former, LE-T, from TSF, and glue to the 1/16” balsa vertical fin side leading sheet- 1/8”...
  • Page 26 15.0 VERTICAL FI COVERS APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 15.7 15.8 Punch out the two 1/16” balsa vertical fin trailing edge For best results wet the side sheeting to allow it to bend sheeting, VFS-R, and the trailing edge formers TE-3 and TE-4 over the contour.
  • Page 27 16.0 FI AL FI ISHI G A D ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 16.1 16.2 Finish sand your entire model using fine grit sandpaper to Note: Depending on your finishing technique the order prepare it for finishing. There are many ways you can finish of gluing on the sub assemblies will vary.
  • Page 28 16.0 FI AL FI ISHI G A D ASSEMBLY APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 16.8 16.8 Trim out the vacuum formed engine exhaust and gun Assemble the landing gear by first applying a small cover. Paint the exhaust assembly flat black. Glue the exhaust amount of epoxy in the landing gear boots.
  • Page 29 17.0 I STALLI G THE MECHA ICS APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 17.1 17.2 Install the short tail boom piece into the tail boom mount Plan your receiver, speed controller, and other compo- that holds the belt drive gear. Install the two servo mounts, if nents where they will be placed in the fuselage.
  • Page 30 17.0 I STALLI G THE MECHA ICS APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS 17.7 17.8 Connect your tail rotor control rod by first connecting it Install the transmission and canopy assembly and fasten to the gearbox. Important: Start by feeling the total travel of with four small screws each through the fuselage and into the the control rod and set the center of the travel in the flat pitch of guide teeth.
  • Page 31 18.0 APPE DIX APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS CA OPY EXPLODED VIEW TRA SMISSIO EXPLODED VIEW AH-1F COBRA—ELECTRIC PAGE # 31...
  • Page 32 18.0 APPE DIX APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS TOW LAU CHER EXPLODED VIEW ROCKET LAU CHER EXPLODED VIEW AH-1F COBRA—ELECTRIC PAGE # 32...
  • Page 33 18.0 APPE DIX APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS VERTICAL FI EXPLODED VIEW T-2 SECTIO VIEW AH-1F COBRA—ELECTRIC PAGE # 33...
  • Page 34 18.0 APPE DIX APPROACH E GI EERI G AH-1F ELECTRIC MECHA ICS AH-1F COBRA—ELECTRIC PAGE # 34...