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SIG CAP 231EX, Assembly Manual, Page: 7 / 26

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wing bolt holes already drilled in the rear center section of 
each wing panel.

Use your hobby knife to remove the 

covering over the two wing bolt holes in the wing panels 
and the bolt plate.

Place the plate in position over the 

trailing edge of the wing, aligning its rear edge with the 
fuselage bottom and its two bolt holes with the bolt holes in 
the wing panels. In this position, press the bolt plate to the 
wing and use a pencil to draw the outline of the bolt plate 
onto the wing. Remove the wing from the fuselage. Use a 
hobby knife to remove the covering material on the wing, 
about 1/8" inside the bolt plate outline. Glue the bolt plate 
to the wing - aligning its bolt holes with those in the wing - 
with thick CA glue. Hold or clamp the plate firmly to the 
wing, allowing the glue to set.

❑

13) From the kit contents, locate the two M5.5 x 35mm nylon 

wing bolts. Mount the wing in place to the fuselage and 
insert the two nylon wing bolts into the two holes. Thread 
the bolts into the blind mounting nuts and use a 
screwdriver to tighten them and the wing in place onto the 
fuselage. Do not over tighten the bolts. Remove the bolts 
and the wing from the fuselage.

❑

14) Connect aileron servo Y-harness to your receiver and servo 

leads to the Y-harness. Turn on your transmitter and plug 
your airborne batteries into your receiver. You should now 
be able to operate your aileron servos.
• Center servos with trims and/or through the radio's 

computer.

• Carefully center servo output arms to exactly 90° upright 

when at neutral.

• Test the action of the servos, making sure the output 

arms move freely and that they move in the correct 
directions for left and right aileron action.

• Turn off the radio system, disconnect the servos from the 

Y-harness.

❑

15) From the kit hardware provided, locate one left and one 

right nylon control horn and four #4 x 3/8" sheet metal 
screws.

Tape the ailerons in neutral and lay the wing 

upside down on your bench. Position one of the ailerons 
horns in place on the bottom, leading edge of the aileron, 
lined up with the servo output arm. Mark the horns hole 
locations onto the aileron with a pointed marker pen. Drill 
two 3/32" dia. guide holes into the aileron at the marks just 
made. Mount the horn in place, using two #4 x 3/8 sheet 
metal screws. Repeat this process on the opposite aileron.

❑

16) Make the aileron pushrods by first soldering a 4-40 solder 

clevis to the unthreaded ends of the two 4-40 x 2-3/4" steel 
pushrods. Thread a 4-40 hex nut onto the threaded end of 
the pushrod, followed by a threaded clevis. Connect the 
solder clevis end of the pushrod to the aileron servo output 
arm.

Holding the pushrod in place to the aileron horn, 

adjust threaded clevis as needed to match its connecting 

pin to the middle hole in the horn - snap the threaded clevis 
in place to the horn. Repeat this process on the opposite 
wing panel.

Remove the tape holding the ailerons in 

neutral to the wing panels.

❑

17) Check the aileron servo action with your transmitter by 

connecting the servos to your receiver. Final adjustments 
of all flying surfaces will be done after assembly is 
complete. This completes the wing assembly.

ENGINE MOUNTING

It is assumed that most modelers will side mount their engines,
with the head in the right cowl cheek. The CAP has a relatively
large amount of area for this type of engine mounting and it is 
highly recommended. Realistically, the engine could be mounted
in any position, including upright or inverted, as long as it is 
understood that the cowl must be cut to clear it. These instructions
assume that your engine will be mounted on its side with the head
in the right cowl cheek. Accurate horizontal and vertical engine
centerline marks are on the firewall. These marks must be used in
order to position your engine accurately to the intended 
thrustline and to accurately mount the cowling. The round hole in
the firewall accepts the front of the fuel tank and is purposely 
offset to allow fuel line clearance when installing most engine
types. The supplied motor mounts are generic. They will accept
many engines but not all. Check your engine for fit to these mounts
before using them. Other after-market mounts are available and
will work on this airplane if you choose.

❑

1) Use a straightedge and pencil to highlight the horizontal and 

vertical centerline marks on the firewall.

❑

2) Measure the width of your engine's case, at the mounting 

lugs. (example: an Irvine 1.50 2-stroke has a case width of 
2.03" (2-1/32") between the mounting lugs and a Saito 1.50 
measures almost exactly 1.80" between the mounting 
lugs.). Divide the case width measurement by 2 and place 
a mark on each side of the vertical centerline on the firewall.

7

Summary of Contents for CAP 231EX

Page 1: ... loss of control You should use heavy duty ball bearing servos with at least 65 inch ounces of torque or more to drive the ailerons elevator and rudder If available use a servo with metal gears instead of plastic Specifically in our prototype models we used Airtronics 94731 servos for the ailerons elevators and rudder This is a dual ball bearing servo rated at 80 inch ounces of torque Another good...

Page 2: ...litter cables we found that clear silicon adhesive works great These assembly instructions will be specific regarding adhesives While we all have our own preferences we would urge you to give careful consideration to these suggestions KIT CONTENTS The following is a complete list of every part included with your CAP 231EX ARF kit This kit was packed and inspected at the SIG factory Each part has b...

Page 3: ...ves require three 3 hinges each and the rudder uses three 3 hinges for a total of 17 hinges and hinge pins These are provided in a separate bag in your kit Begin by using a hobby knife to completely open up and clear each pre slotted hinge openings These slots need to be 1 wide to accept the width of the hinges and about 5 8 deep on each side Next use a short length of thin saw blade material such...

Page 4: ...ng part as possible while still having full left and right or up and down movement ability Again use alcohol and a cloth to carefully remove all excess glue Flex the flying surface to be sure it moves freely Tape the part in place and move to the next surface to be hinged WING ASSEMBLY The wing panels have been carefully built sanded and covered at the factory The dihedral angle has been already b...

Page 5: ...out touching the slot s edge about 1 32 clearance is adequate With the servo now in this position use a sharp pencil to mark the hatch with the locations of the servo mounting blocks Remove the servo from the hatch and apply thick CA or 5 minute epoxy the to bottoms of the servo blocks and glue them in place to the hatch again checking for output arm clearance Place a weight onto this assembly and...

Page 6: ...e 30 minute epoxy to install the two front locating dowels into the front wing plate leave 1 2 of dowel exposed to engage the corresponding fuselage mounting holes Use plenty of glue and a stick to get it into the two holes before inserting the dowels Visually be sure these dowels are straight in the wings and not at angles With the dowels in place stand the wing up on its leading edge and allow t...

Page 7: ...wo 4 x 3 8 sheet metal screws Repeat this process on the opposite aileron 16 Make the aileron pushrods by first soldering a 4 40 solder clevis to the unthreaded ends of the two 4 40 x 2 3 4 steel pushrods Thread a 4 40 hex nut onto the threaded end of the pushrod followed by a threaded clevis Connect the solder clevis end of the pushrod to the aileron servo output arm Holding the pushrod in place ...

Page 8: ... from the front face of the prop drive flange back to the firewall This is the distance your engine needs to be from the firewall for cowl mounting and prop clearance purposes Mark your engine s mounting lug bolt hole locations onto the motor mount arms and remove the engine 7 Note that we have supplied you with most of the hardware needed to assemble this kit with the exception of engine mounting...

Page 9: ...and left sides of the cowl From your parts bag locate two 2 1 8 x 3 4 sq plywood plates four 4 4 40 x 1 2 nylon bolts and four 4 4 40 blind mounting nuts The two 1 8 x 3 4 sq ply plates will be glued to the inside of the fuselage at the upper right and left hole locations directly over the holes just drilled Hold one of the ply plates in place flat against one of the upper inside cowl mounting hol...

Page 10: ... onto the fuselage over your engine In this step you will determine the location for the hole required for your engine s needle valve to exit the cowl This is easiest done using the penlight mentioned earlier in step 1 and fine line marker pen First find the approximate location of where the needle valve will exit by looking carefully at your engine s carburetor Mark that location onto the cowl No...

Page 11: ...your particular engine If required shaft spacers are included If your engine shaft is larger than the hole size in the spinner it can be drilled to fit This should be done using a drill press Slip the base plate onto the shaft Slip the propeller onto the shaft and secure it with your engine s nut and washer Snap the spinner nose cone in place into the base plate channels and use the four mounting ...

Page 12: ...the axle end of the wire If the wheel is a tight fit use a 7 64 dia drill bit to open the axle hole a little The remaining 2 washer will be soldered in place to retain the tailwheel To protect the plastic wheel hub use a scrap piece of 1 32 plywood over the axle and against the wheel Slide the washer in place against the plywood and solder it in place remove the plywood spacer The completed tailwh...

Page 13: ...rt small part with one rounded end with a hole for the tube the pushrod connector assembly 3 16 hex brass body nylon retainer and 4 40 x 1 8 socket head cap screw and the 2 56 solder clevis Drill a 1 8 dia hole through the firewall aligned with your engine s carburetor throttle arm From the front insert the 1 8 nylon tube through the firewall and into the fuselage leaving 3 exposed in front of the...

Page 14: ...overing material just inside of these two lines including where it contacts the fuselage at its leading and trailing edges 14 In this step you will prepare the horizontal stabilizer for mounting by first checking it s alignment with the wing and fuselage Start by using the three M4 x 25mm bolts provided to mount the landing gear to the fuselage Bolt the wing in place Attach a Robart Incidence Mete...

Page 15: ...d of the cable Press the heat shrink tubing in place over the aluminum tube and use heat to shrink it in place Thread a 4 40 hex nut completely onto the rigging coupler followed by a 4 40 R C link Center the link approximately onto the rigging coupler threads Repeat this process on the remaining length of cable These two prepared ends will be located at the rudder Feed the bare end of the cables i...

Page 16: ... and use a standard Y harness with 12 extensions or use the Miracle Y elevator splitter to obtain mirror image elevator action Install the splitter cables through the back of the canopy hatch opening back to the two elevator servo cutouts To avoid a clutter of cables and to keep them away from the pull pull cables route the extensions through the upper rear fuselage Connect the servos to the exten...

Page 17: ...these areas Fit the fairing pressing it firmly in place to make sure it contacts all gluing areas Clean up any excess glue with alcohol and use tape to secure the faring in place Allow the glue to cure 23 Apply petroleum jelly to the elevator hinge knuckles and apply epoxy to the exposed hinge halves Attach the left and right elevator halves to the stabilizer wiping off any excess glue from the hi...

Page 18: ...l collar With the set screw pointing straight down tighten the set screw enough to temporarily retain the wheel 2 With the wheel pant slots facing inward fit the pant in place over the wheel if necessary loosen the wheel collars to reposition the wheel to fit into the pant The pant slot should accept the axle hex nut If not rotate the hex nut with a wrench until the pant slides in place This is ho...

Page 19: ...surface of the canopy base Use a sharp single edge razor blade to cut 1 4 off of the length of each bolt If desired the canopy base can now be detailed On our prototypes we used light gray art paper to line the bottom and back of the canopy base giving it depth and color We measured and cut the paper to fit and applied it to the base with a heavy coat of spray cement We used a commercially availab...

Page 20: ...witch and battery connections to the receiver are now made The aileron Y harness stays plugged into the receiver aileron channel receptacle with the two connecting ends hanging loose for wing attachment Turn the radio system on and check the functions of the throttle elevator and rudder servos These should all now be centered and working perfectly without any binding Correct any such problems now ...

Page 21: ...he actual model These will help you understand where the decals are to be placed When placing the striping tape guide on the fuselage have the cowl in place and the rudder taped to neutral Once the striping tape is placed along the entire length of the fuselage rudder and cowl carefully cut the tape at the rear edge of the cowl and remove the cowl The checkers will be applied to the cowl off the f...

Page 22: ...e engine propeller shaft and the other end over the tailwheel bracket Hang the model from the ceil ing or a rafter leveling it in side view With the model secured in this way observe the wings Ideally they should be level without one wing lower than the other If one panel is lower it means that it is somewhat heavier than the other When flying the model this uncorrected imbalance may cause the mod...

Page 23: ... Assuming you re comfortable and getting used to the airplane take it to a safe altitude and throttle back to get a feel for the slow flight and stall characteristics Properly balanced and trimmed your CAP should demonstrate fairly sedate no fuss stall characteristics Once flying speed and up elevator input is bled off the CAP should just drop its nose and resume flying as speed picks up All of th...

Page 24: ...ampaign IL 61822 HANGER 9 HAN8275 and INSTRUMENT PANEL HANGER 9 HAN177 MIRACLE Y ELEVATOR SPLITTER MAXX PRODUCTS and 815 Oakwood Road Unit D LARGE CAPACITY BATTERY PACKS Lake Zurich IL 60047 and Tel 847 438 2233 AFTER MARKET Y HARNESSES Fax 847 438 2898 INCIDENCE METER ROBART MFG INC P O Box 1247 St Charles IL 60174 CAP 231EX DOCUMENTATION SCALE MODEL RESEARCH FOTO PAAK 5444 3114 Yukon Avenue Cost...

Page 25: ...of any form either model size or full size are not toys Because of the speeds that airplanes must achieve in order to fly they are capable of causing serious bodily harm and property damage if they crash IT IS YOUR RESPONSIBILITY AND YOURS ALONE to assemble this model airplane correctly according to the plans and instructions to ground test the finished model before each flight to make sure it is ...

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