SIG Extra 300XS Assembly Manual Download Page 3

3

WINGS & related parts

1 Right Wing Panel, covered

1 Right Aileron, covered

1 Left Wing Panel, covered 

1 Left Aileron, covered 

1 Right Aileron Servo Hatch, covered 

1 Left Aileron Servo Hatch, covered 

4 3/8" x 3/4" x 3/4" Hardwood Aileron Servo Mounts 

1 Hardwood Wing Joiner 

1 Aluminum Tube Rear Wing Joiner

2 1/8" x 1-1/2" x 1-1/2" Plywood Wing Bolt Plates

2 1/4-20 x 2 Nylon Wing Bolts 

LANDING GEAR & related parts

1 Aluminum Main Landing Gear

3 M4 x 15mm PWA* Bolts; for landing gear 

2 Steel Wheel Axles 

2 M8 Lock Nuts; for wheel axles 

2 3-3/4" dia. Main Wheels 

4 Wheel Collars with Set Screws 

1 Right Fiberglass Wheel Pant, painted

1 Left Fiberglass Wheel Pant, painted

4 M3 x 15mm PWA* Bolts; for wheel pants

CONTROL SYSTEM PARTS

3 RIGHT Metal Control Horns; for ail.(1), ele.(1), & rud.(1)

3 LEFT Metal Control Horns; for ail.(1), ele.(1), & rud.(1)

24 M2.6 x 10mm Metal Screws; for control horns

2 4-40 x 2-3/4" Threaded Pushrods; for elevators

2 4-40 x 3-5/8" Threaded Pushrods; for ailerons

6 4-40 Threaded R/C Links; for ail.(2), ele.(2), rud.(2) 

6 4-40 Hex Nuts; jam nuts for R/C links 

4 4-40 Solder Links; for ail.(2), ele.(2) 

1 1/8" od x 18" Nylon Pushrod Tubing; for throttle pushrod

1 1/16" od x 18" Stranded Steel Cable; for throttle pushrod

1 1/8" x 5/8" x 1-1/4" plywood Throttle Tube Support

1 2-56 size Solder Link; for engine end of thr. pushrod

1 Brass Pushrod Connector Body; servo end of thr. pushrod

1 Molded Nylon Retainer; for pushrod connector

1 4-40 x 1/8" Socket Head Bolt; for pushrod connector

TAILWHEEL ASSEMBLY PARTS

1 Main Leaf-Spring with Steering Arm, Wheel Yoke, and

Tailwheel installed

1 Short Leaf-Spring

2 Coiled Steering Springs

1 Metal Rudder Horn (T-shaped)

2 M2 x 9mm PWA* Screws

3 M3 x 14mm PWA* Screws

PULL-PULL CABLE SYSTEM PARTS

1 .024" dia. x 96" Steel Cable

4 Copper Swage Tubes

4 Threaded Rigging Couplers with Knurled Stop Nut

4 Metal JDL R/C Links

FUEL TANK  PARTS

1 450cc (15.2 oz.) Oval Plastic Tank 

1 Rubber Stopper 

1 Metal Front Clamp 

1 Metal Rear Clamp 

1 Clamp Bolt 

1 Metal Clunk Pickup 

2 Aluminum Tubes

1 Fuel Tubing for inside tank

2 9" Fuel Tubing

SPINNER PARTS

1

3" dia. Spinner, White 

1

3" dia. Back Plate, White 

1

Prop Shaft Adapters

4

Self-Tapping Screws 

MISCELLANEOUS

20 M2.6 x 10mm PWA* Screws; for aileron servo hatches(8),

ail. servo mount blocks(4), fuselage hatch(4), cowling(4)

6

M3 x 8mm PWA* Screws; for canopy

2

Glass-Filled Engine Mounts

4

10-32 x 1" Socket-Hd. Mtg. Bolts; for engine mount

4

10-32 Blind Nuts; for engine mount

4

#10 Flat Metal Washers; for engine mount

1

Decal Sheet

* PWA = phillips washer-style head

NOTE ABOUT COVERING MATERIAL
Your EXTRA 300XS ARF has been professionally covered with
Oracover

®

#10 White, #54 Violet, and #71 Black(Note: In the

United States, Oracover

®

is sold under the name of Hangar 9

Ultracoat

®

. The equivalent Ultracoat colors are called #870 White,

#868 Smoke Purple, #874 Black).

Oracover

®

is well known for its ease of application, light weight and

consistency of color. If you live in a drier climate, you may notice
that some wrinkles might develop after removing the covered parts
from their plastic bags. If that is the case, there is no need to be
alarmed. This is perfectly normal in low humidity climates. Your
model was built and covered in a part of the world with relatively
high humidity and therefore the wood was likely carrying a fair
amount of moisture. When exposed to drier air, the wood typically
loses this moisture, dimensionally "shrinking" in the process. In
turn, this may cause some wrinkles. (If you've been in modeling
long, you've undoubtedly noticed that most iron-on coverings stay
tight in the summer only to loosen a little in drier winter conditions.)  

Any wrinkles that appear in the covering are easy to remove by
using a hobby-type heat iron. We suggest covering the iron's shoe
with a thin cotton cloth, such as an old T-shirt, to prevent scratching
the film. The iron should be set to about 280

O

- 300

O

F.

First, use the heated iron to go over all the seams and color joints
in the covering, making they are all sealed and well adhered. Then
use the heated iron to lightly shrink the material - do not press on
it. Once the covering is tight, lightly iron the material back down to
the wood. You can also use a hobby-type heat gun to re-shrink the
covering, but you must be extra careful around the seams. Re-
heating seams may cause them to "creep", making them unsightly.

MODELER’S TIP:

One of the most common problems 

associated with shrinking any covering film is controlling the 
heat around seams. Heat applied close to or directly onto 
seams re-heats the covering adhesive and the seam will often 
"crawl". This is easy to control. Just tear a few paper towels 
into strips and soak them in cool tap water. Lay the wet strips 
over any covering seam and use your heat gun or iron as you 
normally would. The wet strips keep the seam cool while the 
covering immediately next to it shrinks. This tip works great 
with any iron-on covering.

Summary of Contents for Extra 300XS

Page 1: ...h the pushrods coming off the top of each servo in direct line with the control horns This is done so the geometry of the servos pushrods and horns is exactly symmetrical on both sides providing the exact same response to control inputs for each elevator This is very important in an all out aerobatic machine like the EXTRA Normally in order to have this type of setup work properly with a standard ...

Page 2: ... Irvine 1 20 and 1 50 2 stroke engines extensively and found that both engines provide suitable power and are easy to install and operate in the EXTRA 300XS In the case of the Irvine 1 50 with a 16 x 8 APC prop we have excellent vertical performance not unlimited vertical but it will go straight up for an impressive distance much longer than most typical R C models When using a 2 stroke engine ins...

Page 3: ... 10 32 x 1 Socket Hd Mtg Bolts for engine mount 4 10 32 Blind Nuts for engine mount 4 10 Flat Metal Washers for engine mount 1 Decal Sheet PWA phillips washer style head NOTE ABOUT COVERING MATERIAL Your EXTRA 300XS ARF has been professionally covered with Oracover 10 White 54 Violet and 71 Black Note In the United States Oracover is sold under the name of Hangar 9 Ultracoat The equivalent Ultraco...

Page 4: ... Hardwood Wing Joiner right side up the greater angles are on the bottom 1 Locate the two pre covered aileron servo hatches and eight M2 6 x 10mm PWA Screws Trial fit the hatches into the aileron servo openings to determine which hatch goes in the right wing and which goes in the left wing Tape the hatches in place aligning their servo arm cutouts with the ones in the wing openings 2 Drill a 3 64 ...

Page 5: ...he wing panels use your radio system to center both servos and to check servo travel Make sure both servo output arms are 90O to the servos and that they are long enough to clear the wing s bottom surface during extremes of travel a Now attach 12 long servo extension chords to both aileron servos Note Be sure to put a piece of tape around the connecting plugs so they can t come apart while hidden ...

Page 6: ...easily Use a sharp 11 blade in your hobby knife to adjust ONE of the holes slightly to the left or right to achieve a good fit Once the wing dowels properly engage press the rear of the accept the square knuckle part of the hinge You need to countersink the holes to accept the knuckle part of the hinge so that the hinge can be pushed in far enough for the pivot point to line up with the front V po...

Page 7: ...are already pre drilled in the center to pass the nylon wing bolts Notice that there are also holes for the wing bolts pre drilled in the rear center section of each wing panel Hold one of the wing bolt plates in position on the BOTTOM of the wing aligning the hole in the plate with the bolt hole in the wing Use a pencil or fine tip marker to draw the outline of the plate onto the wing Do the same...

Page 8: ...ttach a solder link onto the unthreaded end of one of the threaded pushrods Thread a 4 40 hex nut onto the threaded end of the pushrod followed by a 4 40 threaded R C link Connect the solder link end of the pushrod to the aileron servo output arm Holding the other end of the pushrod up next to the aileron horn adjust the threaded R C link as needed to match its connecting pin to the horn Repeat th...

Page 9: ... are sunk securely into the back of the firewall Apply some epoxy glue around the flanges of the blind nuts to keep the nuts from coming loose Be careful not to get any glue in the threads of the blind nuts 7 With the engine mounts bolted on the firewall place your engine on the mounts Move the engine forward or backward on the mounts until you measure exactly 6 from the front face of the prop dri...

Page 10: ...gap between the back of the spinner backplate and the front of the cowl Center the spinner backplate to the cowl and use masking tape to secure the back of the cowl to the fuselage leaving the four pre drilled mounting holes along the back edge of the cowling uncovered 3 With the cowl securely taped in place use a 3 64 or 56 dia drill bit to drill pilot holes in the fuselage centered in each of th...

Page 11: ...is to make a simple 90O aluminum bracket to hold the valve mount it to the firewall and then make a small hole in the cowl to accept the fuel probe We mounted our filler bracket near the left edge of the firewall Our bracket was made from K S 1 16 thick aluminum sheet Drill one end of the bracket with a 3 8 dia hole to accept the fuel valve body and drill two 7 64 dia holes at the other end allowi...

Page 12: ...hat best suits the throttle arm on your engine Mount your throttle servo in the plywood tray using the grommets and mounting screws supplied with your radio system 2 Locate the 1 8 od x 18 Nylon Pushrod Tubing the 1 16 x 18 Stranded Steel Cable the 1 8 x 5 8 x 1 1 4 plywood Throttle Tube Support has one rounded end with a hole for the tube the Pushrod Connector assembly hex brass body nylon retain...

Page 13: ... seal iron to tack the loose covering around into these cutouts Trim and remove the excess covering material 4 Inside the fuselage slip the plywood throttle tube support over the end of the nylon pushrod tube and up against the forward fuselage former Position the plywood support so that it aims the nylon tube directly at the throttle servo s output arm Then glue the plywood support to the former ...

Page 14: ...in is absolutely 90O upright on the fuselage and that it is aligned straight with the centerline of the fuselage not turned left or right b When satisfied with the alignment use a felt tip pen to mark the fin location on top of the stab Take the fin off and carefully remove the covering material from the stab just inside of the lines NOTE Accurate alignment is ultra critical to the performance of ...

Page 15: ...Apply a coat of glue to the inside of the fairing where it will contact these areas Install 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 fairing in place Allow to dry 10 Mount the rudder servo in the center servo cutout in the fuselage using the grommets and screws supplied with your radio system ...

Page 16: ...e back and run it back through the copper tube Pull the tube up to the rigging coupler about 1 2 away from it Use pliers or a crimping tool to squeeze the copper tube tightly over the cable locking it in place Cut off the excess short end of the cable Thread an R C link onto the rigging coupler centering it on the threads Repeat this process to make the same type of end on the other piece of cable...

Page 17: ...s of silicone adhesive to lightly fasten the extension chords or the MIRACLE Y control pot in place to the model structure to keep them from flopping around during flight and possibly coming unplugged Finally plug the chord into your radio system to check the action of the elevator servos Make any corrections that may be required 19 Hinge the elevators to the stabilizer at this time Be careful to ...

Page 18: ...ors and use spray cement to glue it in place on the cockpit deck Last we mounted a 1 4 scale civilian pilot figure to the cockpit deck to finish off the cockpit detailing There are many brands of pilot figures available No matter which brand you use be sure to reinforce the bottom of the cockpit deck by epoxying a piece of scrap 1 32 or thicker scrap plywood underneath the area where the pilot wil...

Page 19: ... reproductions of some of the insignias that are typically seen on full scale aerobatic airplanes They are not intended to be a complete set of markings to duplicate one particular EXTRA 300XS However we think you ll agree that when applied to the SIG EXTRA as shown on the box label they look very realistic and believable Feel free to use all or only some of the decals in different locations as yo...

Page 20: ...at a good straight edge a ruler and a hobby knife with sharp 11 blades We also suggest that you have some trim tape handy for making temporary guidelines 1 8 width or so is perfect for help in aligning the decals First spray the surface of the model where the decal is to be placed with a soapy water mixture Then peel the backing sheet completely off the decal being careful not to let the sticky si...

Page 21: ...oved aft an airplane will become more responsive in all axis but it will be especially noticeable to a model pilot in pitch up and down We have flown the EXTRA at the 30 location and found it to be manageable with excellent aerobatic capabilities However we did notice an increase in pitch sensitivity and had decrease the elevator throw to compensate Softening elevator response with a reasonable ex...

Page 22: ...safely for years Your R C model airplanes should receive the same consideration While still at the flying field and after you ve finished flying for the day empty the fuel tank completely with your fuel pump After draining the tank start the engine and let it run the fuel lines totally dry Old glow fuel that has been left in the tank for more than a few hours will not run properly After each flyin...

Page 23: ...23 EXTRA 300 LOG BOOK Date of first flight Comments ...

Page 24: ...The color and markings of this ARF kit do not duplicate one particular full scale Extra 300XS Rather they are a realistic selection of markings typically seen on many full scale aerobatic airplanes 24 ...

Page 25: ...ther 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 completely air...

Page 26: ...ng the most power at a reasonable cost First Place Engines are your best choice for large gasoline powered model airplane power plants All engines use piston and cylinder assemblies from world renowned manufacturers such as Husqvarna and Sachs Makita insuring long life and easy operation Using state of the art CNC machines First Place produces all other major components from high quality billet al...

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