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3DHS Bigfoot 84" Assembly Manual

3dhobbyshop arf rc aircraft
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3DHobbyShop.com
Bigfoot 84" Assembly Manual
Thank you for purchasing this 3DHobbyShop ARF RC aircraft. If you have any issues, questions,
concerns or problems during assembly, please contact our tech department at:
Info@3DHobbyShop.com
or 717-814-5316 10am-4pm Eastern Monday – Thursday.
SAFETY in Assembly
During assembly of this aircraft, you will be asked to use sharp knives, hot irons, and hobby adhesives.
Please follow all safety procedures recommended by the manufacturers of the products you use, and
always follow these important guidelines:
ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power tools. Safety
glasses are the best way to protect your eyes.
ALWAYS protect your body, especially your hands and fingers when using adhesives, knives, or tools,
especially power tools. Do not cut toward exposed skin with hobby knives. Do not place hobby knives on
tables or benches where they can roll off or be knocked off.
ALWAYS have a first-aid kit handy when working with adhesives, knives, or tools, especially power tools.
ALWAYS keep hobby equipment and supplies out of the reach of children.

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Summary of Contents for 3DHS Bigfoot 84"

  • Page 1 3DHobbyShop.com Bigfoot 84” Assembly Manual Thank you for purchasing this 3DHobbyShop ARF RC aircraft. If you have any issues, questions, concerns or problems during assembly, please contact our tech department at: Info@3DHobbyShop.com or 717-814-5316 10am-4pm Eastern Monday – Thursday. SAFETY in Assembly During assembly of this aircraft, you will be asked to use sharp knives, hot irons, and hobby adhesives.

  • Page 2: Required Items

    Blue Loctite thread-locking adhesive Dremel-type rotary tool Small adjustable wrench or wrench set IMPORTANT NOTE: 3DHS Recommends ONLY High-Torque, Digital, Metal-gear Servos for this aircraft. Suitable part numbers include Hitec HS-7955TG,and HS-7954SH. DO NOT attempt to use nylon-geared servos on this airplane.

  • Page 3: Covering Material

    WRINKLES Your Bigfoot was packed at the factory without any wrinkles in the covering. You may notice some wrinkles now; more likely, you will notice a few in a day or two or the first time you take the plane out to the flying field.
  • Page 4 Also remove the covering over the wing spar, wing pin and retainer, and servo wire openings as shown. Remove the covering over the horizontal stabilizer slot and the rear servo openings as needed. NOTE: Bigfoot includes two rudder servo mounts, one in the rear on the right side (shown below) and one in the cabin for pull-pull cable arrangement.
  • Page 5 Test fit the vertical stabilizer into the slot but do not glue it yet. The fit should be snug. If it is too tight, sand the bottom of the vertical stabilizer slightly.
  • Page 6 The main axles on the Bigfoot include a cross-drilled hole in the end of the axle for positive retention of the main wheels with a cross-pin. Bolt the main axles onto the landing gear as shown.
  • Page 7 Your kit includes 3" wheels, which are a very lightweight option. If you wish to use them, install them onto the axles along with wheels collars and pins as shown.
  • Page 8 For a more scale look, you can use 6"-8" balloon tires, such as the pictured DuBro 6" balloon tires. Be certain to use the cross pins as shown for wheel retention. Attach the landing gear to the fuselage as shown, being sure to loctite these screws.
  • Page 9 Use rubber cement or epoxy to attach the landing gear fairings. Use tape to hold the fairings in place while the glue sets.
  • Page 10 Use rubber cement or epoxy to install the landing gear cover plate on the bottom of the fuselage as shown.
  • Page 11 Installing the tail surfaces: Slide the carbon main wing spar tube into position. Without any glue, temporarily install both the horizontal and vertical stabilizer as shown and check for alignment with each other and the wing tube. Make any adjustments needed by sanding or shimming. Do not remove any covering from the horizontal stabilizer.
  • Page 12 Install the control horns onto the rudder and elevator. Note that if you are using pull-pull rudder, you will need to install control horns onto both sides of the rudder. If you are using gas power, you will only need one horn, on the right.
  • Page 13 Apply a drop of vaseline or oil to the center axle of each hinge point. Be careful not to get it on the ends of the hinge points.
  • Page 14 Install the elevator joiner into the slot in the elevators with 30 minute epoxy, and install the hinge points into the horizontal stab and elevators with 30 minute epoxy. Align everything and apply masking tape as shown to hold elevators in alignment while the glue dries. Install the rudder hinge points with 30 minute epoxy as shown.
  • Page 15 Install elevator servo as shown, running extension forward through the fuselage. Install elevator pushrod as shown.
  • Page 16 If you are using the tail mounted rudder servo, install rudder servo and pushrod as shown. IF you are using an electric power system and need to use the pull-pull rudder system, mount the rudder servo as shown.
  • Page 17 The pull-pull cables for the rudder are assembled as shown in the following diagram: Assemble the forward ends of the pull -pull cables first. Crimp the brass crimp sleeves firmly, looping the cable trough as shown. Install the cables onto the rudder servo as shown.
  • Page 18 At the rear of the fuselage, pull the cables taut and crimp the ends as on the front. NOTE: Do not pull the cables too tight. They only need to be snug, so that they do not sag and the rudder does not flop back and forth.
  • Page 19 Locate the stabilizer brace wire hardware pack. There are a total of six cables. Four long cables for the top, two shorter for the bottom.
  • Page 20 Kiwk-links and a small threaded pushrod with a hole in one end are provided for the ends of the cables. This allows for small adjustment once all the cables are installed. Each wire is made up with the same technique as the pull-pull rudder. Insert the small pushrods 4-5 turns into the kwik-links. Then install the kwik-links to each hard point.
  • Page 21 kwik-links more to make the cable taunt. Note: as with the rudder pull-pull cables, we just want to take up the slack... not banjo or guitar tight. Once you are satisfied with the cable tension, apply medium CA where the pushrod enters the kwik-link and apply CA kicker. This will keep the pushrods from rotating, but will allow adjustment later if necessary.
  • Page 22 Install the tiller bar and springs as shown.
  • Page 23 Use the template to mark the firewall, or transfer your engine or motor's mounting dimensions to the firewall. Drill the firewall and cut for carb clearance if necessary.
  • Page 24 If you are using electric power, you may elect to use the electric motor extension box. If you motor's mounting pattern down no match the extension box, you may use standoffs to mount your electric motor directly to the firewall.
  • Page 25 Install throttle servo box on appropriate side of fuselage for your engine using 30 minute epoxy.
  • Page 26 Mount your engine as shown. Mount the ignition box as shown. Mount fuel tank as shown.
  • Page 27 Trim cowl for cylinder clearance and cooling. Use tape and paper strips as shown to make the cowl for drilling as shown. Install wood screws to retain the cowl as show.
  • Page 28 Install side door as shown, using thin CA on the hinges as shown. Apply canopy glue to the side windows as shown.
  • Page 29 Install the side windows into the fuselage and side hatch and use masking tape to hold windows in place while the glue dries.
  • Page 30 Apply canopy glue to windscreen as shown. Use tape to hold windscreen in place while the glue dries. When glue is dry, you can outline the windscreen with black trim tape for appearance.
  • Page 31 Using 30 minute epoxy, install control horns in the flaps and ailerons as shown. Remove the covering over the aileron servo opening as shown.
  • Page 32 Install servo as shown. Install servo cover, also locate the screw holes for the wing struts and remove the covering over them as shown.
  • Page 33 Install the flap servo as shown.
  • Page 34 Remove the covering over the flap servo arm slot as shown. To achieve full flap deflection, you will need to trim the slot as shown. Assemble aileron and flap pushrods as shown.
  • Page 35 Install flap servo arm and pushrods as shown.
  • Page 36 Once the flap servos are operational, check the current draw at full flap deflection. It is important to be precise in setting the servo endpoints. If you let the servo travel too far, the current draw will increase dramatically. The goal is achieve 70-75 degrees of flap deflection at a very low current draw...
  • Page 37 Bigfoot includes locations on the leading edge of the wing for lights. You can install an LED light system in these locations if desired. The kit includes form-fitting lenses for the leading edge of the wing. Start by trimming the lens material to length. Install the lenses with canopy glue and trim tape as shown.
  • Page 38 Install the wings onto the wing spar tube and fuselage and attach with the nylon wing bolts. Assemble the wing struts as shown with bolts and locknuts. Attach wing struts in-between fuselage and wing as shown with a bolt and washer. Take your time installing the wing struts the first time.

  • Page 40: Control Setup

    Install receiver into fuselage, we mount it under the fuselage top hatch for easy access. Install receiver battery on fuel tank tray as needed for CG adjustment. If additional weight is needed for CG location, we recommend the use of modeling clay inside the motor box. Install a 18-21"...
  • Page 41 Center or Gravity We recommend a CG of 3.5 inches, measured back from the leading edge of the wing at the wing root (where the wing meets the fuselage). This provides a fairly nose-heavy CG so the pilot may maiden and trim the aircraft.