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Tamjets A4 Skyhawk Assembly And Flight Set-Up Manual

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Tamjets
A4 Skyhawk
Assembly and Flight Set-up Manual
Specifications:
Wing Span......................48"
Weight (Dry)...........18.5 – 21 lbs
Fuel Capacity..................70 oz.
Overall Length.................70"
Radio............................Min. of 8 channels required
Turbine Power .................13 to 17 lbs thrust turbine

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Summary of Contents for Tamjets A4 Skyhawk

  • Page 1 Tamjets A4 Skyhawk Assembly and Flight Set-up Manual Specifications: Wing Span………………….48” Weight (Dry)………..18.5 – 21 lbs Fuel Capacity………………70 oz. Overall Length……………..70" Radio……………………….Min. of 8 channels required Turbine Power ..……………13 to 17 lbs thrust turbine...
  • Page 2 You will find the assembly to be straight forward provided that you follow these instruction in the sequence as outlined. An assembly jig is now available from TAMJETS to aid in the alignment of the wings to the fuselage ensuring proper wing and supporting bulkhead alignment.
  • Page 4 Hinges pivot point Servo control arm and linkage hook up...
  • Page 5 BEGIN CONSTRUCTION: FUSELAGE: 1. Locate all plywood components that will be fitting into the Nose cone. Trial fit all parts together and LIGHTLY sanding any part that may cause the fiberglass to “BULDGE” as we do not want this tight a fit as we must allow for the glue joint as well.
  • Page 6 3. Trial fit all bulkheads inside of the fuselage and sand (if needed) to obtain proper fit-up to the fuselage and sand the fiberglass in these bulkhead areas as well. DO NOT GLUE AT THIS TIME. 4. Locate the forward fuselage bulkhead and drill (3) 3mm holes (# 31 Drill) as shown.
  • Page 7 5. Trial fit the nose cone to the fuselage and transfer the location of the 3) 3mm holes onto the bulkhead in the nose cone. Remove the nose cone and drill clearance holes to install 3) “T” nuts on the forward side of the Nose cone bulkhead.
  • Page 8 6. Assemble the TAMJETS A4 assembly jig using CA+. With the Fuselage positioned in the jig, slide the Wings into the fuselage. Insure that the wings are tight against the fuselage sides. When properly fitted to the fuse, the ROOT of the wings should be resting on the JIG SADDLES.
  • Page 9 NOTE: Check to see that the vertical fin centerline is 90 Degrees to the work surface using a square. IF it is not, shim UNDER the fuselage jig to accomplish this before performing step 7. Maintain this alignment when installing wings and horizontal stabilizers later !!! 7.
  • Page 10 9. With the bulkheads positioned against the clamps, double check to insure that the wings are properly supported in the jigs and aligned per step 6, tack the clamps to the bulkheads with CA+ and allow to cure. DO NOT GLUE THE BULKHEADS to the FUSELAGE at this time.
  • Page 11 NOTE: Check to see that your turbine mounts fit the rails properly side to side. If you need wider rails, consider cutting new ones from birch ply and install or you can add filler pieces to the outside of the existing rails BUT you will need to glue a 1/16”...
  • Page 12 17. Assemble bulkheads F2, F3 and the tray. Place into the fuselage and slide forward into position. Check fit to fuselage and sand F2 & F3 as required to obtain proper fit if needed. Remember that the TRAY is removable. 17.
  • Page 13 19. Install the Latches into the REAR of the Main Hatch by locating the pin holes first. Then mark the location of the Lever on the top surface of the hatch and remove. Repeat for both latches. 20. Trial fit and check operation. When satisfied, glue into place.
  • Page 14 21. Using the Black Magic Marker, coat the end of the hatch pin, install hatch, pull back and release striking the fuselage identifying the location of the pin. Drill 1/16” hole at this location. Repeat for both latches. 21. Locate a hole in each FRONT corner of the Main Hatch for the mounting of the brass tube pins.
  • Page 15 23. Prepare to mount the canopy frames by Drill a #22 hole to receive the Brass pin. (NOTE: Carbon Fiber Pins can be substituted for the supplied Brass Pin.) 24. CA Pins into place. 25. Mark and drill into Fuselage to receive the pins.
  • Page 16 26. Shorten the latch pin by pulling the latch back, holding and cutting the pin LEAVING 1/16” pin REMAINING. 27. Locate the latch pin opening as you did for the Main Hatch. 28. Locate and cut the latch lever slot into the Fuselage. Mount the latch using CA tack.
  • Page 17 31. Lightly sand the backside of the F/G fuselage inlet pieces and the mating surface of the fuselage, then using CA+ or 5 Min. Epoxy, glue the fuse. Inlet sections into place. 32. Locate the Left and Right air inlet ducting and trial fit them into the fuselage and mate to the backside of the fuselage Inlet pieces just installed.
  • Page 18 34. Trial fit and secure the Inlet dusting into the bulkhead as shown using #2 x 3/8” Socket Head Sheet Metal screws. 35. Trim the Inlet ductings to suite your installation. 36. Remove the bell mount from the pipe first. Slide the pipe from rear forward. Use servo screw to secure the pipe to engine rail.
  • Page 19 37. Adjust the engine location to insure that the FRONT EDGE of the pipe Bellmouth Inlet is EVEN with the REAR of the Engine Exhaust nozzle. Inserting the engine nozzle too far into the tailpipe can result in high engine EGT’s. 38.
  • Page 20 39. Install fiberglass tail cone. Use micro screws to secure the cone. 40. Install nose gear door, air cylinder and closing valve.
  • Page 21 WINGS: 1. Locate the Main Landing gear and install the wheels and brakes. Use the washers provided to center the tires on the struts. The thin washers are positioned between the E-Clip and the tire bushing. 2. Insert the main gear assy. into the pre-cut wing opening and position the gear so that the tire is centered in the wheel opening.
  • Page 22 3. Locate the Flap hinges. Note that 3 are required for each flap, (1 w/ horn 2 w/o). Very carefully cut a slot into the wing skin at the 3) location marks already provided. The Horn Hinge is to be aligned wit the Servo output arm. 4.With the flap still taped to the wing, mark the location of the rear portion of the flap hinge and proceed to cut slots for these as well.
  • Page 23 6. Remove the flashing from the ends of the wings in the hinge area to allow for the ailerons to fit into and rotate properly. 7. Locate the aileron hinges and trial fit them to the wings. 8. Lubricate the hinge pins with a very small amount of Vaseline to prevent glue form sticking to them.
  • Page 24 9. Using 15 Minute epoxy or Aeropoxy, insert a small amount of glue into the hinge holes in the AILERONS only. DO NOT try to glue hinges into both the Ailerons and Wing at the same time as it is to difficult to keep the hinges aligned properly.
  • Page 25 11. Install wheel pod. (Note: try fit the wheel pod to made sure you had the correct side before doing any work).
  • Page 26 12. Prepare to mount the servos (JR-3421’s or equal). Install the servos into the mounting trays. The trays will be mounted to the servo hatch. Sand the bottom of the servo trays to insure good adhesion with the Epoxy. This procedure is duplicated for ALL flight control servos. 13.
  • Page 27 15. Using masking tape, locate the servo output arm location as this will be transferred to the cover. 16. Trial fit the cover in place and mark the cover cutout. ( Stab. Servo Cover used as a ref. only for this task.) 18.
  • Page 28 19. Drill thru the cover into the wings at the 4) corners with # 23 drill. Then remove and drill COVERS ONLY w/ # 33 drill. 20. Using a Dremel, recess the holes. This completes the Wing assy. Set aside until final assy. HORIZONTAL STAILIZER / ELEVATORS: 1.
  • Page 29 4. Locate the Elevator Horn buy alignment with the servo output arm. Mark the bottom of the Elevator with the Horn Location. 4. Cutout a slot equal to the Horn width. 5. Cut the horn as shown to obtain a proper fit into the slot.
  • Page 30 6. When satisfied with fit Epoxy into place with 15 Min. or AEROPOXY. This completes the Stabilizer / Elevator assy. Set aside until final assy. to fuselage. RUDDER : 1. The Rudder is hinged in the same manner as the other surfaces as is the Rudder servo installation.

  • Page 31: Final Assembly

    FINAL ASSEMBLY: 1. Trial fit the horizontal stabilizers to the fuselage using the short and long Aluminum pins. 2. With the fuselage in the jig and the fin checked to be square with the work surface as per Fuselage assy. step 6, insert the stabs into the fuselage. 3.
  • Page 32 When satisfied, glue in place using 15 Min. epoxy. RECHECK ALIGNMENT. 5. Install the Radio system insuring that all servos meet or exceed the recommended ratings as listed in the beginning of this manual. Locate all batteries forward to help achieve aircraft balance to eliminate the need for ballast.
  • Page 33 7. Install the retract air support system with the Air valve and servo on the equipment tray or on the side of the fuse.
  • Page 34 8. Install that Air - Quick Connect systems and bulkhead as shown. (Note this hard point Air-Quick Connect systems require good fitting. Otherwise it could leak when wing was not plug in other way). You can use the standard Air-Quick Connect.
  • Page 35 9. Hump option installation. 10. Tail Hook installation.
  • Page 36 11. Fuel Probe 12. Left side fin This completes the final assy.
  • Page 37 DISCLAIMER Tamjets R/C Inc. assume no liability for the operation and use these products. The owner and operator of these products should have the necessary experience and exercise sense. Said owner and operator must have a valid Academy of Model Aeronautics license and a...