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Construction Manual

WARNING

READ THROUGH THIS MANUAL 

BEFORE STARTING CONSTRUCTION. 

IT CONTAINS IMPORTANT WARNINGS 

AND INSTRUCTIONS CONCERNING 

THE CONSTRUCTION AND USE OF THIS 

MODEL.

A Radio-Controlled aircraft is not a toy!

If misused, it can cause serious bodily harm 

and damage to property. Fly only in open 

areas, preferably at AMA (Academy of Model 

Aeronautics) approved flying sites, following all 

instructions included with your radio, powerplant, 

electronics and batteries.

We urge you to join the AMA (Academy of Model Aeronautics) and 

a local R/C club. The AMA is the governing body of model aviation 

and membership is required to fly at AMA clubs.

Though joining the AMA provides many benefits, one of the 

primary reasons to join is liability protection. 

Additionally, training programs and instructors are available at 

AMA club sites to help you get started the right way. There are 

over 2,500 AMA chartered clubs across the country. Contact the 

AMA at the address or toll-free phone number below:

Academy of Model Aeronautics

5161 East Memorial Drive • Muncie, IN 47302

Phone (800) 435-9262 • www.modelaircraft.org

IMPORTANT!!! 

Two of the most important things you 

can do to preserve the radio controlled aircraft hobby are to avoid 

flying near full-scale aircraft and avoid flying near or over groups 

of people.

INCLUDED ITEMS

Wood parts included in this kit:

•  2 - LP1 - laser cut 1/8” x 6 x 24 sheet

•  2 - LP2 - laser cut 1/8” x 6 x 24 sheet

•  1 - LP3 - laser cut 1/8” x 6 x 24 sheet

•  1 - LP4 - laser cut 1/8” x 6 x 24 sheet

•  1 - BP1 - laser cut 1/8” x 4 x 24 sheet

•  2 - BP2 - laser cut 1/8” x 4 x 24 sheet

•  1 - BP3 - laser cut 1/8” x 4 x 24 sheet

•  2 - BP4 - laser cut 1/16” x 4 x 24 sheet

•  2 - BP5 - laser cut 1/16” x 4 x 24 sheet

•  4 - BP6 - laser cut 1/16” x 4 x 24 sheet

•  1 - BP7 - laser cut 1/4” x 4 x 24 sheet

•  1 - BP8 - laser cut 1/4” x 4 x 24 sheet

•  1 - BP9 - laser cut 1/4” x 4 x 24 sheet

•  1 - BP10 - laser cut 1/16” x 4 x 24 sheet

•  1 - 1/8” x 3 x 24 sheet

•  5/16” x 1/2” x 36” balsa strips (4 pieces)

•  1/4” x 1/4” x 36” balsa strips (3 pieces)

•  3/16” x 3/16” 36” balsa strips (4 pieces)

•  1/8” x 1/8” x 36” balsa strips (5 pieces)

•  5/16” x 1-1/4” x 36” tapered balsa strips (2 pieces)

•  3/16” x 3/8” x 36” basswood strips (4 pieces)

•  1 - 1/4”x 6” wooden dowel.

Hardware parts included in this kit:

•  2 - pre-bent landing gear

•  C/A type hinges for control surfaces

•  4 - control horns

•  4 - wheel collars 3/16” I.D.

•  2 - wheel collars 3/32” I.D.

•  1 - 5/64 rod (for tailwheel)

•  4 - plastic straps

•  2 - 1/4”-20 wing bolts

•  10 - 2-56 x 3/4” machine screws

•  15 - 2-56 x 3/4” self tapping screws

•   1 - canopy

•   4 - 1/4” x 1/16” Neodymium disc magnets

Other items included in this kit:

•  2 - Rolled plans (fuselage and wing)

•  1 - Construction Manual

ITEMS NEEDED

Hardware needed (not included in the kit) 

For some of these items there is more than one option which will 

require a bit of decision making ahead of time. There isn’t a right or 

a wrong choice, so choose the items that work best for you. 

Our engine size recommendation range is a .40-45 two-stroke 

or an electric motor with similar power output, an 800-900 watt 

brushless motor with a 80amp esc and 4-5S LiPo pack.

 

Here is a list of additional parts needed to complete and fly this 

kit, all of which must be purchased separately. Again, we would 

recommended supporting your local hobby shop.

• Powerplant:

 

 

if Electric (800-900 watt motor, 80amp ESC, 4-5S LiPo)

 

 

if Glow (.40-.45 engine, 6 ounce tank, fuel tubing)

• Propeller

•  Engine/Motor mount and mounting hardware

•  Receiver - (4 channel minimum)

•  Servos with 40-70 in./oz. of torque 

  1 each for elevator and rudder; 1 for each aileron if using 

ailerons; 1 for throttle (if using a glow engine) 

•  “Y” servo harness

•  Pushrods (two 5” for ailerons, two 24” for elevator & rudder, 

one 12” for throttle if glow powered)

•  Clevises for the pushrods (8 if electric, 10 if glow).

•  3” diameter wheels

•  1” tailwheel

• Covering

•  Optional pilot figure for the open cockpit.

Additional Required Building Tools and Adhesives

•  Drill & assorted drill bits

WARNING: This product can expose you to chemicals including lead, which 

is known to the State of California to cause cancer and birth defects or other 

reproductive harm.  For more information go to www.P65Warnings.ca.gov.

Summary of Contents for Sky Ranger 40

Page 1: ...irst class condition a correctly sized power system and components electronics batteries wheels etc throughout the building process You must correctly install all R C and other components so that the model operates correctly on the ground and in the air Installation shown in the manual is a suggestion You may have to adjust the mounting steps to accommodate the size of your radio equipment You mus...

Page 2: ...strips 4 pieces 1 4 x 1 4 x 36 balsa strips 3 pieces 3 16 x 3 16 36 balsa strips 4 pieces 1 8 x 1 8 x 36 balsa strips 5 pieces 5 16 x 1 1 4 x 36 tapered balsa strips 2 pieces 3 16 x 3 8 x 36 basswood strips 4 pieces 1 1 4 x 6 wooden dowel Hardware parts included in this kit 2 pre bent landing gear C A type hinges for control surfaces 4 control horns 4 wheel collars 3 16 I D 2 wheel collars 3 32 I ...

Page 3: ... as clearly as you might want So we ve anticipated this and made these photos available on our website You can either scan the QR code or type this address into your browser www oldschoolmodels com mpics sr40 Let s begin construction by working on the right starboard wing of your Sky Ranger 40 Prepare your work area You ll need a flat building surface that is a minimum of 36 long Position the righ...

Page 4: ... R2 Locate two of the WB1s from BP6 and one R2 from LP1 Note that the WB1s have a slight angle on one end and there is a small circle engraved This angled side should face the inner root rib with angle tapering upwards circle on top Fit and glue both of these to R2 then glue that assembly to the spar Step 10 Wing Assembly WH1 assembly Locate one WH1 and two R1As from LP1 The two R1As fit into the ...

Page 5: ...ng Assembly sheeting Using a bit of the leftover sheeting from the BP6 sheets measure cut and glue together the sheeting to cover the area between R1 and R2 When measuring make sure that the grain is crosswise flowing from R1 to R2 Also measure so the sheeting extends about 1 16 past R2 When edge gluing the sheeting pieces together first make sure the edges are flat give a quick swipe or two with ...

Page 6: ...the 1 16th x 1 4 x 36 balsa strips Also cut and glue a cap to the horizontal balsa strip glued behind the servo mount in step 24 Step 29 Wing Assembly cut holes for servo wires On the plans you ll see a callout suggesting a spot where a hole needs to be cut in the top sheeting This hole allows the aileron servo wires to pass through the sheeting and exit the wing Make these roughly 1 2 to 3 4 inch...

Page 7: ...f the string so they won t easily pull out Do the same for the right panel Step 36 Cut and hinge the ailerons Measure and cut the correct length and shape for each 5 16 x 1 1 4 x 36 strip to make the ailerons Round the leading edge of both ailerons When finished shaping make the necessary slots holes needed to hinge the ailerons to each side of the wing We recommend 4 hinges per aileron Step 37 Ai...

Page 8: ...e left side to the fuselage Trial fit this next step before applying any glue as there are a lot of tabs that have to properly fit into the fuselage side If using C A use a medium or thick formulation to give you time to fit everything together When the left side is fitted hold it in position or place a couple of weights on it until the glue fully cures When cured remove the fuselage from the boar...

Page 9: ...h assembly The hatch is assembled in place on the fuselage Care must be taken to position smaller pieces of waxed paper to make sure the hatch won t be glued to the fuselage Locate H1 H2 and H3 from LP4 Cut two of the leftover 1 8 x 1 8 balsa strips to span between F3 and F2 while resting on the fuselage sides Position H1 up against the back of F2 resting on both of the 1 8 square strips Now posit...

Page 10: ...h pieces It s much easier to do this now than to try it after they re installed Step 73 Fuselage Assembly Stab alignment Although we ve done everything possible to engineer the Sky Ranger 40 so it will form a sturdy block for the landing gear wire Slide one of the LG2 pieces into the pre cut slots on the fuselage sides Now paying close attention to the orientation of LG2 holes begin sliding the re...

Page 11: ...od around this area with a bit of thin C A You ll also need to cut a small groove into the leading edge of the rudder This will allow the tailwheel wire to rest flush with the leading edge of the rudder Step 77 Elevator relief Using 4 of the C A hinges dry fit the elevator to the stab Mark and trim the area where the leading edge of the elevator rubs against the tailwheel s axle Test the elevator ...

Page 12: ...ill need be drilled to allow the wires to pass through into the fuselage Also a few cooling holes are needed for internal battery cooling The ESC mounts underneath the TR1 battery tray and the motor s power battery mounts to the tray Both the ESC and battery are held in place with more self adhesive hook and loop Glow power The engine mounts so the crankshaft is positioned at the center of the fir...

Page 13: ...ws The amount of control throw should be adjusted as closely as possible using mechanical means rather than making large changes electronically at the radio By moving the position of the clevis at the control horn toward the outermost hole you will decrease the amount of control throw of the control surface Moving it toward the control surface will increase the amount of throw Moving the pushrod w...

Page 14: ... accepts all resulting liability Limit of Liability In the use of this product our only obligation shall be to replace such quantity of the product proven to be defective The user shall determine the suitability of the product for his or her intended use and shall assume all risk and liability in connection therewith If the buyer is not prepared to accept the liability associated with the use of t...

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