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17

servo output arms in place at 90

O

upright. Tape the elevators to the

stabilizer in neutral position. Attach the solder link ends of the
elevator pushrods to the servo output arms. Adjust the threaded
R/C links to fit into the middle hole of each elevator horn. Remove
the tape holding the elevators in neutral and test the movement of
the elevators with your radio.

Adjust as required to get both

elevators exactly at neutral (if you are using the "Miracle Y™"
chord, you can turn the pot adjustment screw to achieve exact
neutral very easily). Final elevator throw adjustments and locking
the R/C links in place with the hex nuts will be made later.

LANDING GEAR AND WHEEL PANT ASSEMBLY
NOTE: We suggest you use Loctite

®

threadlocking compound on

all bolts used in the assembly of the landing gear.

❑

1) Locate the two fiberglass Wheel Pants, two Main Wheels,

the two Steel Wheel Axles, two axle Lock Nuts, four Wheel Collars
with Set Screws, and four M3 x 15mm PWA Bolts. Install the axles
into the large holes at the bottom of each leg of the aluminum main
landing gear. Thread the large lock nuts onto the threaded ends of
the axles and tighten these securely.

Note: On the axle side of the gear leg, the two flat sides of the
flange must end up parallel to the front of the landing gear, so that
the notch in the wheel pant will fit over the flange properly.

❑

18) As mentioned earlier, to make the elevator servos function

properly you will need to either;

(a) electronically reverse one of the elevator servos internally

and use a standard Y-harness, or

(b) use the " MIRACLE Y™ Servo Reversing Y Adapter" to

obtain mirror image elevator action

Install your Y-harness chord through the canopy opening, back to
the two elevator servo cutouts. To avoid a clutter of chords and to
keep them away from the pull-pull cables, route the y-harness
chord through the upper part of the rear fuselage.

Plug the

elevator servos into the Y-harness ends at the servo cutouts,
securing all connector plugs with tape. Then reinstall both elevator
servos, pulling the excess chord lengths towards the front. Use
plastic "cable ties" or small spots 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 correctly identify which elevator goes on the right side and which
goes on the left. Look for the plywood mounting pads that are inset
into the BOTTOM side of each elevator, underneath the covering.
After installing the hinges, wipe off all excess glue from the hinge
line with alcohol, and then tape the elevators to the stabilizer in
neutral position and allow to dry.

❑

20) After the hinges are dry, mount the control horns to the

elevators. You will need the two remaining Metal Control Horns and
eight M2.6 x 10mm Metal Screws.

As mentioned, there are

plywood mounting pads already inset in the bottom of the elevators,
under the covering material. Hold the control horn in place on the
elevator, lined up with the elevator servo output arm. Make sure the
pivot holes in the control horn line up with the hinge line. Mark the
control horn mounting holes on the elevator with a felt pen. Drill a
3.64” dia. (or #56 drill) pilot hole for each screw, then screw the horn
in place. Repeat this procedure on the opposite elevator.

❑

21) Locate the two 4-40 x 2-3/4" Threaded Pushrods for the

elevator, plus two 4-40 Solder Links, two 4-40 Threaded R/C Links
and two 4-40 Hex Nuts. Make two elevator pushrod assemblies by
soldering a solder link onto the unthreaded ends of the pushrods.
Thread a hex nut onto the threaded ends, followed by an R/C link.
Use your radio to center the elevator servos and then mount the

IMPORTANT: After mounting the elevator control horns for
the first time, take them back off and set aside temporarily.
Put a few drops of Thin CA into each of the screw holes in the
elevator. The Thin CA will soak into the threads in the wood,
increasing their holding power. Be sure to use Thin CA, not
medium or thick CA. Let the Thin CA dry completely before
remounting the control horns onto the elevators.

WHEEL PANT

ALUMINUM

LANDING GEAR

STEEL

AXLE

WHEEL

LOCK

NUT

M3 x 15mm

PWA BOLTS

WHEEL

COLLAR

WHEEL

COLLAR

Содержание Extra 300XS

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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 ...

Страница 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...

Страница 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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