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Tower Hobbies Sbach Instruction Manual

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WINGSPAN
49.6 in [1260 mm]
19– 20 oz/ft
LENGTH
47.5 in [1207mm]
®
Tower Hobbies
guarantees this kit to be free
from defects in both material and workmanship
at the date of purchase. This warranty does not
cover any component parts damaged by use or
modification. In no case shall Tower Hobbies' liability
exceed the original cost of the purchased kit. Further, Tower
Hobbies reserves the right to change or modify this warranty
without notice.
In that Tower Hobbies has no control over the final assembly or
material used for final assembly, no liability shall be assumed nor accept-
ed for any damage resulting from the use by the user of the final user-assem-
bled product. By the act of using the user-assembled product, the user accepts
all resulting liability.
If the buyer is not prepared to accept the liability associated with the use of this
product, the buyer is advised to return this kit immediately in new and unused condition
to the place of purchase.
To make a warranty claim, visit: towerhobbies/support
®
© 2017 Tower Hobbies.
 A subsidiary of Hobbico, Inc. 
I N S T R U C T I O N M A N U A L
WING LOADING
[58 – 62 g/dm
]
2
2
WEIGHT
4.0 – 4.3 lbs [1814 –1928 g]
WING AREA
482.0 in
[31.1 dm
]
2
2
RADIO
4 – 5 channels, 4 servos
READ THROUGH THIS MANUAL
BEFORE STARTING CONSTRUCTION.
IT CONTAINS IMPORTANT
INSTRUCTIONS AND WARNINGS
CONCERNING THE ASSEMBLY
AND USE OF THIS MODEL.
POWER
1.65" [42 mm] diameter, 925W
RimFire .32 (42-50-800)
3300– 4000 mAh 4S LiPo 75A ESC
(not included)
TOWA2026

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Summary of Contents for Tower Hobbies Sbach

  • Page 1 INSTRUCTIONS AND WARNINGS without notice. CONCERNING THE ASSEMBLY In that Tower Hobbies has no control over the final assembly or material used for final assembly, no liability shall be assumed nor accept- AND USE OF THIS MODEL. ed for any damage resulting from the use by the user of the final user-assem- bled product.

  • Page 2: Table Of Contents

    Futaba R617FS 7-channel FASST receiver (FUTL7627) LiPo Battery Charger The Sbach is intended to be fl own with mini servos in the 20g range such as Futaba S3150 or Futaba S3172SV mini servos. To charge a 4S 3800 mAh LiPo at 1C, a charger capable of about 65 Watts output power is required (4S x 4.2V/cell =...

  • Page 3: Kit Inspection

    TOWA5034 Hatch for working TOWA5035 Landing Gear on your TOWA5036 Wheel Pants Sbach. TOWA5037 Spinner TOWA5038 Decals TOWA5039 Wing Tube A covering iron with a cover sock may be required for tightening and re bonding covering to the model that may have loosened between the time the plane was manufactured and the time the model was removed from the box.

  • Page 4: Preparation

    CANOPY REMOVAL/INSTALLATION PREPARATION Between the time the covering was applied to your model and the time it arrives in your hands it is normal for the covering to loosen and wrinkle – especially if it has been a long time and/or the air is dry at your location (causing the structure to contract and the covering to loosen).

  • Page 5: Assemble The Wing

    6. NOTE: The procedure for preparing the holes in wood for all wood screws is as follows: 3. OPTIONAL: When you get to the ailerons, elevators and rudder, puncture three or four pinholes through the A. Drill the hole with the drill specifi ed in the step. covering on the bottom of those surfaces between each of the braces or “ribs.”...
  • Page 6 to the servo, then cut off the unused arms. Drill out the holes in the arm with a #49 (.073") drill. Horn all the way to leading edge of aileron. 90° Pushrod Connector 1/16" [1.6mm] 5. Test-fi t, but do not glue the fi berglass wing tabs into the ends of the wings.

  • Page 7: Assemble The Fuselage

    epoxy. Before the epoxy hardens, reinstall the wings back onto the fuselage and position the tabs so the slotted holes will be centered over the holes in the brackets. Momentarily remove the wings to be sure there is no excess epoxy around the tabs that would inadvertently stick the wing to the fuselage.
  • Page 8 4. Temporarily mount the elevator servo, then remove 7. Now that the stab is level with the wing, center the it (it’s easier to drill the holes for the elevator servo now, stab laterally by using a ruler to equalize the distance from before the stab has been glued in).
  • Page 9 though the ink and most of the covering on top of the stab are black, you’ll still be able to see the line indicating where the covering will be cut and removed in the next step. 10. Insert a pin into the middle of the fuselage crutch across the top of the former as shown.

  • Page 10: Glue In The Horizontal Stabilizer

    Glue in the Horizontal Stabilizer 1. Gather your small paper towel squares and denatured alcohol for epoxy clean up. Small balsa sticks chopped up from 1/16" [1.5mm] balsa sheet are also handy for “squeegeeing” away most of the epoxy before using the paper towel squares.

  • Page 11: Hinge The Elevators And Rudder

    Hinge the Elevators and Rudder 1. Once more, test-fi t the elevators to the stab with the joiner wire and hinges to make certain all the hinges and the joiner wire go in and everything fi ts together well. 5. Permanently glue in the hinges with four or fi ve drops of thin CA on the top and bottom of all the hinges –...
  • Page 12 Hook up the Rudder and Elevators 1. Cut the included rudder pull/pull line into two equal lengths. 8. Use 30-minute epoxy to permanently glue the torque rod centered into the rudder with the wood washers, metal washers and M2 nuts as shown. 2.
  • Page 13 Rudder lines cross one time. 11. Arrange the rudder pull-pull lines so they will cross as illustrated. Also be sure the lines are below the cross brace at the cockpit former as illustrated in the image at step 13. 5. Cut off the short end of the line near the swage. 6.

  • Page 14: Mount The Motor And Esc

    2. Drill 1/16" [1.6mm] pilot holes through the punch marks, then enlarge the holes with a 5/32" [4mm] drill. 15. Attach a 12" [305mm] servo extension to the elevator servo, then mount the servo in the fuselage and guide the wire down through into the cabin.

  • Page 15: Final Radio Installation

    Final Radio Installation Refer to this image while mounting the receiver. 1. Connect the ESC and elevator and rudder servos to the receiver and 6" [150mm] servo extensions for the aileron servos. Mount the receiver with adhesive-back hook-and- loop strips or other preferred method. Guide the servo wires over and around the internal structure as needed so nothing interferes with the rudder pull/pull lines.
  • Page 16 Now let’s do the tail gear… Wheel Washer Collar Axle Wheel pant 5. Glue the nylon tail gear bushing into the bottom of the fuselage. 2. Assemble the wheel and wheel pant to the landing gear as shown—hold the nut with hemostats or needle-nose pliers while tightening the axle with a fl at-blade screwdriver.

  • Page 17: Mount The Cowl

    8. Mount the tail gear wire with the clip, two M2 x 10 Phillips wood screws and a wheel collar with the set screw. Use a .050" hex driver wrench to tighten the set screw to 3. Install the cowl, the spinner back plate, propeller and prop nut to the motor.

  • Page 18: Prepare The Model For Flight

    the spinner, the screw holes may be enlarged or elongated to 2. Use the programming in your transmitter and/or move slightly reposition the cowl. the pushrods to holes farther out or in on your servo arms and/or the control horns to adjust the control throws as 6.

  • Page 19: Balance The Model Laterally

    1. Support the bottom of the rudder (a servo case was used for the model in the image) and lift the Sbach several times by the propeller shaft to see if one wing drops. Do this several times to get a consistent reading.

  • Page 20: Motor/Propeller Discussion

    50 – 55A in the air, but averages a little less than 20A through a “normal” fl ight. This is a suitable propeller choice and fl ies the Sbach well. Another suitable propeller choice is the APC or Xoar 14 x 7 which provides slightly more thrust at the expense of a little speed which is okay for this type of plane.

  • Page 21: Range Check

    These are two 3200mAh batteries (one 11.1V and the 11.1V other 7.4V). When joined in SERIES, the result will be a 18.5V, 3200 mAh battery. (3-Cell) 3200mAh 11.1V (3-Cell) 3200 mAh SERIES SERIES adapter This is a SERIES battery adapter that connects two batteries in series.

  • Page 22: Radio Control

    FLYING 1) I will have completed a successful radio equipment ground The Sbach has no bad fl ight characteristics or idiosyncrasies check before the fi rst fl ight of a new or repaired model. that you need to be made aware of ahead of time. The C.G.
  • Page 23 Notes...
  • Page 24 ® © 2017 Tower Hobbies.  A subsidiary of Hobbico, Inc.  TOWA2026...

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