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Assembly and operation of this aircraft must be done by or under the direct
supervision of a responsible adult. If not handled correctly, this model is capable of
inflicting serious bodily harm. It is your responsibility and yours alone to assemble this
model correctly, properly install all R/C components, and to test and operate it in a safe
and responsible manner.
Copyright
1994
INSTRUCTION BOOK
WARNING! THIS IS NOT A TOY!
Sturdy
Birdy
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Table of Contents
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Summary of Contents for Hobbico Sturdy Birdy
- Page 1 Sturdy Birdy INSTRUCTION BOOK WARNING! THIS IS NOT A TOY! Assembly and operation of this aircraft must be done by or under the direct supervision of a responsible adult. If not handled correctly, this model is capable of inflicting serious bodily harm. It is your responsibility and yours alone to assemble this model correctly, properly install all R/C components, and to test and operate it in a safe and responsible manner.
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Page 2: Table Of Contents
Repairing......................18 INTRODUCTION Congratulations on your purchase of the HOBBICO STURDY BIRDY, THE FIRST REAL SUPER TRAINER You now own the BEST FLYING durable trainer available By following these instructions as you assemble the model you will have a great flying plane that will not only teach you how to fly but it will stick with you while you learn, no matter... -
Page 3: Parts List
PARTS LIST Stock #..Description ........Qty Stock # ..Description ........Qty ARF1F01 ..Plastic Fuse Tube......1 ARF1F05 ..Landing Gear Strips.....2 ARF1F02 ..Aluminum Channel ......1 ARF1S04 ..1/16" Ply Stab Doubler....1 ARF1P01 ..Instruction Book......1 DOWEL030.. 1/4" Dowel........4 ARF1R05..1/64" Ply Fin Doubler....1 ARF1M01 ..Hardware Sub-Pack EM2040 ..Engine Mount (Left &... -
Page 4: Additional Item List
FUEL TANK ADDITIONAL ITEMS The STURDY BIRDY was designed to hold a square NEEDED tank We recommend a Great Planes 6 oz. tank (#GPMQ4102). Here is a description of some of the additional items you will need to assemble your STURDY BIRDY. -
Page 5: Fin/Rudder
CONSTRUCTION FIN/RUDDER so that the outer hinges are approximately 1" from the ends of the rudder and the middle hinge is in the center. D 1. The fin is made up of the three pieces shown above. Locate these three pieces and lay them out. D 4. - Page 6 D 6. Trial fit the fin and rudder together using the hinges to check for proper alignment. Do not glue the hinges in place yet! Sand the rudder and/or fin so they match each other at the top. D 7. Remove the hinges from the rudder and bevel the leading edge with your sanding block as shown in the sketch.
- Page 7 D 16. Mark the hinge locations using the same technique D 13. Use a sanding block to round the edges of the you used in step #4. There are five hinges used here. The fin/rudder assembly as shown above. Give the sides a outer hinges are approximately 1"...
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Page 8: Wing Assembly
bottom of the channel and line the stabilizer up with the slots in the wing to make sure it fits nicely Mix up channel (using the line you just drew) When you are about 1/2 oz of epoxy and spread it throughout the satisfied with the alignment draw a line down both sides slot in one wing panel With the wing panel upside of the channel on the top of the stabilizer. -
Page 9: Covering
If you are planning on doing some aerobatics or combat with your STURDY BIRDY you should also put three D 29. Cut the supplied 2" x 9" CA Hinge Strip into 24 strips of tape on the top surface of the wing. -
Page 10: Fuselage
round off the corners with a sanding block. Test fit the doubler into the front of the plastic fuselage tube as shown in the photo. The firewall doubler should fit into the fuselage with a snug but not tight fit. The front of the fuselage is cut at a slight angle so the firewall and thus the engine will point down slightly. - Page 11 D 37. Cut the "spreader bar" off each mount half. Trim D 40. Temporarily install the engine on the mount with off any burrs or flashing, then snap the mount halves two #4 x 1/2" sheet metal screws. Mark the location of together.
- Page 12 Large servos will not work in the STURDY BIRDY. The servos should be placed as far forward in the channel as possible and right next D 47. Press the fin/rudder into the channel with the...
- Page 13 D 48. Assemble the two pushrods by screwing a 1" threaded rod into one end of each inner pushrod and then screwing a nylon clevis onto each threaded rod. The rod should thread into both the pushrod and the clevis at least 1/4".
- Page 14 D 54. Assemble the short throttle pushrod by screwing the remaining 1" long threaded rod and nylon clevis into one end of the 12" long inner pushrod and snapping this assembly onto the throttle servo horn. D 57. Tack glue or hold these in place for the next step. D 55.
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Page 15: Final Assembly
vent line to the pressure tap on the muffler. Make the the throttle control. Make sure you can achieve both full throttle and idle without binding of any kind. It is also fuel lines long enough so that there is a 1" gap between the fuel tank and the back of the firewall. -
Page 16: Balancing
This will help keep the control FLYING surfaces from fluttering. The STURDY BIRDY is a very stable flying airplane with a unique self-recovering system designed into it. This makes it one of the easiest-flying planes BALANCING available. -
Page 17: Repairing
Your control inputs should be very gentle until the The STURDY BIRDY is very tough, but there may plane has climbed high enough to be out of danger of be crashes hard enough to break parts of the plane. - Page 18 Pilots Log Use this to record your flights, it's fun to look back on! Date Flight Time Conditions Comments...
- Page 19 Date Flight Time Conditions Comments Engine Mount Template for 20-48 Adjustable Mount...
- Page 20 WITH AILERONS Locate the two 15/32" x 3/8 x 26-1/2" Sub Trailing Edge pieces (Sub T.E.). Trial fit the Sub T.E. against the trailing edge of each wing half. The Sub T.E. should be oriented as shown in the sketch with the 90 degree corners along the bottom of the wing.
- Page 21 Locate the two 3/8" x 1-1/4" x 37/8" Tapered Center Trailing Edge pieces. Use the inset sketch above to help you determine which side is the top and mark the lop side of each piece. Make another mark 7/16" from the "inboard" end of each piece. Notch each piece to make a slot for the torque rod.
- Page 22 Use150-200grit sandpaper to roughen the outer surface of the torque rod bearing Slide the bearing toward the threaded end of the torque rod and put a small amount of petroleum jelly around the ends of the bearing tube to prevent epoxy from seeping in Spread some epoxy in the slot and on the leading edge of the center trailing edge pieces Do not apply any epoxy within 1 /4"...
- Page 23 Epoxy the two 11/32" x 2" x 1-5/8" Tapered T.E. Supports to the inboard bottom of each center trailing edge as shown in the photo.
- Page 24 Use a sanding block with 150 grit sandpaper to sand the inner ends of the sub trailing edge, center trailing edge and the tapered trailing edge to match the angle of the foam wing end. Be careful not to change the angle of the foam wing.
- Page 25 6. Hold the 3/8" x 1-1/4" x 22-1/4" Ailerons in place against the sub trailing edge and under the torque rods. Mark the location where the torque rods will enter the ailerons. Drill a 3/32" hole in each aileron to accept the torque rods.
- Page 26 Cut a groove in the leading edge of the aileron to allow clearance for the torque rods. Trial fit the ailerons in place and cut as necessary until they fit.
- Page 27 Draw an accurate centerline along the leading edge of the aileron and cut three hinge slots in each aileron The hinge slots should be approximately 1-1/2", 10" and 18" from the wing tip Place the ailerons against the sub trailing edge and mark the hinge locations on the wing Draw a center line down the sub trailing edge and cut the hinge slots to match the ailerons.
- Page 28 Using a sanding block, sand the leading edge of each aileron to a "V" shape as shown in the photo above.
- Page 29 10. Insert the hinges into the slots and trial fit the ailerons in place on the wing. Do not glue the hinges until after you have covered the wing. Sand the outboard edge of the sub trailing edges and the ailerons to match the foam wing tips.
- Page 30 11. Use a sharp hobby knife or a Dremel Tool with a tapered cutting bit to trim out the servo and torque rod cut outs in the Plastic Center Section Protector. There are scribe lines on the bottom surface of the protector to help guide you Trial fit the aileron servo in place and trim as necessary to make it fit properly Use scissors or your hobby knife to trim the outside edges of the wing protector along the remaining scribe...
- Page 31 12. Place the wing protector on the center of the wing so the torque rods fit through their holes and draw a line on the wing around the servo cut- out. Remove the protector and carve out a hole in the foam wing to fit your servo.
- Page 32 13. Glue the 3/16" x 1/4" x 1-1/4" Basswood Servo Rails in place along the front and back edges of the servo cut-out. Put the aileron servo in place and mark on the plastic protector where the servo mounting screws should be. Drill 1/16" diameter holes on the marks you just made and mount the servo using the screws provided with your radio...
- Page 33 14. Trial fit the wing protector assembly on the wing and enlarge the cutouts in the foam wing if necessary to make the protector lie flat against the wing. When satisfied with the fit, remove the servo and use coarse sandpaper to scratch up the bottom of the wing protector so the glue will hold better.
- Page 34 15 Mount the aileron servo with the screws provided in the radio system and assemble the pushrods as shown in the sketch above Attach the pushrods to the torque rods by screwing the Aileron Clevis Connector onto the threaded portion of the torque rod Use a pair of needle nose pliers to make the Z bends and attach them to the servo horn Turn on your radio, plug in your aileron servo and adjust the centering of the servo horn until it is centered and the right aileron moves up when you...