Jtec Radiowave EXTRA 330L User manual

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40% EXTRA 330L & 300 PAK
Partially Assembled Kit
Manual
Please read through the entire manual first. It contains important instructions and warnings
concerning the finishing of the model.
WARRANTY AND PRODUCT DISCLAIMER
Radiowave Hobby Ind. 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 RADIOWAVES' LIABILITY EXCEED THE
ORIGINAL COST OF THE PURCHASED KIT. Further Radiowave reserves the right to change
or modify this warranty without notice.
In that Radiowave has no control over the final assembly or material used for final assembly, no
liability shall be assumed nor accepted for any damage resulting from the use by the user of the
final user-assembled product. By the act of using the user-assembled product, the user accepts all
resulting liability.
IF THE BUYERS ARE NOT PREPARED TO ACCEPT THE LIABILITY ASSOCIATED
WITH THE USE OF THIS PRODUCT, THEY ARE ADVISED TO RETURN THIS KIT
IMMEDIATELY IN NEW AND UNUSED CONDITION TO THE PLACE OF PURCHASE
AT THE BUYERS EXPENSE.

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INTRODUCTION
Congratulations and thank you for purchasing the Radiowave 40% Extra 330L PAK.
Flying the Extra 330L is a very rewarding experience, as it should be for such an aerobatic model.
With the aircraft control surfaces set for precision aerobatics, the aircraft will perform prescribed
aerobatic patterns as used in IMAC (International Miniature Aerobatic Club) events exceptionally
well. With control surfaces set for freestyle flying, the aircraft will perform today’s modern 3D
aerobatic maneuvers to really showcase the aircraft’s aerobatic potential.
PRECAUTIONS
Please finish the Extra 330L according to the instruction provided in this manual. We do not
recommend altering the model in any way that could result in an unsafe model. To prevent any
possibility of flutter, please make sure that there is no slop or backlash on the control linkages.
Install gap seals, especially on the ailerons. Use only high quality, high-torque servos (minimum
120 in-oz each) for all the control surfaces.
This manual provides very detailed assembly instructions for this model. Experienced modeler
may find these instructions much too detailed but we felt it is better to provide more detail than not
enough as to avoid mistakes that could be costly as well as time consuming.
Flying the Extra 330L is a very rewarding experience as it should be for such an aerobatic model.
With the aircraft control surfaces set for precision aerobatics, the aircraft will perform prescribed
aerobatic patterns as used in IMAC (International Miniature Aerobatic Club) events exceptionally
well. With control surfaces set for freestyle flying the aircraft will perform such 3D aerobatic
maneuvers as waterfalls, elevators, flat spins; knife-edge loops and pop ups that showcase its
aerobatic finesse.
The 40% Extra 330L is designed for engines from 140cc to 160cc. Unlimited vertical performance
is achievable with these engines.
PRECAUTIONS
Before starting the construction of the kit, please read through this instruction manual first.
All parts are bagged or assembled according to its function. For instance all the fuselage
parts you need for fuselage construction are bagged and labeled “fuselage” (except the
fuselage sides, which are readily identified). You may also wish to identify the parts by
checking the Parts List.
Please assemble and finish the Extra 330L according to the instructions and building sequence
provided. We do not recommend altering the kit by the addition of lightening holes or any other
modifications that could result in an unsafe model. When you are ready to fly the aircraft, to
prevent any possibility of flutter, please make sure that there is no slop or backlash on the control
linkages for all the control surfaces and install gap seals on the ailerons. As a further precaution,
the following minimum servo torque is recommended for the control surfaces; for each aileron, a
minimum servo torque of 120 in-oz is required and 3 servos must be used. For each elevator use
at least two servos with minimum of 80 in-oz of torque. For the rudder, to get good knife-edge
performance, 3 or 4 servos of at least 120 in-oz (preferably 160 in-oz) are used or two giant scale
servos of at least 260 in-oz per servo.

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A NOTE FOR SAFETY AND PRODUCT DISCLAIMER
Please fly the Extra 330L safely and in a professional manner. Radiowave Aviation accepts no risk
or liabilities when customers use our products for any circumstance, occurrence, happenings,
bodily harm or death to yourself or anyone. Please follow the Academy of Model Aeronautics
(AMA) flight safety rules and regulations. Assume the use of our products at your own risk.
ADDENDUM TO 40% EXTRA PAK
Before gluing on the root rib to the wing it will be necessary to cut the
trailing edge to make the proper fit to the fuselage.
To do this slide the wing on the wing tube till the trailing edge touches the
fuselage.
Take a long piece of balsa and lay it between the wing and the fuselage.
Draw a line on the balsa from the leading edge to the trailing edge along
the wing side.
This will be the taper that needs to be cut. Place the wings back in the
shuck; reverse the tapered piece so the wide end is now at the trailing
edge. Transfer the line to the shucks. This will be the amount of Material
you will need to remove from the root end of the wing for the proper fit to
the fuselage.
Before you cut make sure you have the right taper and the right fit. Use
the shuck as a test piece.
40% Extra 330L PAK Specifications
Wingspan 125 inches
Wing Area 2,775 sq. inches
Fuselage Length 115 inches (tip of spinner to end of rudder)

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Weight 37-39 lbs.
Engine 140cc to 160cc
Radio 4-channel, 9-14 servos
Note: Specifications subject to change without notice.
Features of the 40% Extra PAK (Partial Assembled Kit)
Fuselage:
Constructed with laser cut balsa, lite-ply and birch-ply parts
Plug-in Wing and Stab Panels
Built-in tunnel for tune pipes/mufflers
Fiberglass cowl and wheelpants
Aluminum landing gear, wing and stab tubes
Clear canopy
Wing:
Fully sheeted foam core wing panels
Ailerons are cut out double beveled for 3D aerobatics
Servo locations are precut with mounting hard points installed.
Vertical Fin:
Fully sheeted foam core.
Rudder cut and beveled for 3D with hard point installed.
Horizontal Stabilizer:
Fully sheeted foam core.
Elevators are cut and double beveled for 3d aerobatics
All hard points pre installed.
Servo locations are precut with mounting hard points installed

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PREPARATIONS
1. Required Accessories
There is no hardware provided with the kit since most modelers prefer to use their own brand of
hardware and accessories. Listed below is the hardware and accessories that you will need to
complete the model. In some cases, we have listed the brands that we have used and recommend,
although by no means are you required to use the brands mentioned.
Item Used: Number Recommended Brand For
8-32 Socket Head
Bolts 4
Du-Bro, Goldberg,
Great Planes, Sig Landing Gear
8-32 Self-Locking
Nuts 4
Du-Bro, Goldberg,
Great Planes, Sig Landing Gear
Landing Gear Axle 2
Du-Bro, Goldberg,
Great Planes Landing Gear
Wheel Collars 4
Du-Bro, Goldberg,
Great Planes Landing Gear
Wheel Pant Mounts 2 Sig, Sullilvan Landing Gear
4 ½ or 5 Inch Wheels 2 Sullivan, Du-Bro Landing Gear
6-32 x ¾ Socket
Head Bolts 6
Du-Bro, Goldberg,
Great Planes Hatch Mounts
¼ - 20 knobs 4 JTEC
Wing Attachment to Fuselage
Tail Gear and Wheel 1 Graph tech Tail Gear
4-40x 1” Turnbuckles 4 Dubro Elevator Control Rods
Hinges 44 Klett Air, Elev, Rudder
Control Horns 7 Rocket City Air, Elev, Rudder
Ball Links 8 Rocket City, DuBro Air, Elev, Rudder
4-40 x 2”
Titanium turnbuckles 6 Hangar 9 Ailerons Control Rods
Fuel Tank (50 ox) 1 Du-Bro Fuel Tank
5 inch Spinner 1
Tru-Turn, Revolution, Vortec
Spinner
6-32 1 Socket 4 Du-Bro, Goldberg Horizontal Stab
Head Bolts Great Planes Attachment to Fuselage
Clamp Loks J’TEC Servo wire guides
Pillow Paks J’TEC Servo, Battery
• Accessories that are required to mount the engine, radio, and servos are not included in the
list above.
• The Push Rods can also be made from carbon fiber tube with threaded 4-40 rods at each
end.

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Parts List
As we have made revisions some parts may no longer be
required to build this kit
Fuselage
Number Material Purpose Part ID.
12 3/8”sq x”balsa longerons
stringers & braces
2 1/8” lite ply Fuselage side, front FS1
2 1/8” lite ply Fuselage side, rear FS2
2 1/8” lite ply Aft. Fuselage doubler AFD
2 1/8” lite ply Tail wheel mounting plate TMP
1 balsa sheet Vertical fin mounting plate VMP
2 ¼” lite ply Engine box sides EBS
1 ¼” lite ply Former F1 F1
1 ¼” lite ply Former F2 F2
1 1/8” lite ply Former, bottom fuselage BF1
1 1/8” lite ply Former, bottom fuselage BF2
1 1/8” lite ply Former, bottom fuselage BF3
1 1/8” lite ply Former, bottom fuselage BF4
1 1/8” lite ply Tank Floor TF
1 3/32 x 3.25 balsa sheet fuselage bottom sheeting
1 1.5” fiberglass phonolic wing tube housing
1 7/8” fiberglass phonolic tail tube housing
1 ¼ “ ply large for firewall, cut and laminate together
Hatch:
5 3/8” sq. balsa Hatch stringers
2 3/8”x 3/8” balsa Hatch longerons
3 3/32”x 3.25 balsa Hatch sheeting
6 1/8” lite ply Hatch mounting tabs HMT
1 1/8” lite ply Hatch floor, front HFF
1 1/8” lite ply Hatch floor, rear HFR
1 1/8” lite ply Hatch former, front HF1
1 1/8” lite ply Hatch former, mid HF2
1 1/8” lite ply Hatch former, rear HF3
1 1/8” lite ply Canopy former CF1
1 balsa Dash panel

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Turtledeck:
1 sheeted foam turtledeck
1 1/8” lite ply Front turtledeck former TDF1
1 1/8” lite ply Rear turtledeck former TDF2
Wing:
1 Sheeted foam Right wing panel
1 Sheeted foam Left wing panel
4 lite ply alignment donuts
1 1.5”x 48” aluminum wing tube
Horizontal Stabilizer
1 Sheeted foam Right Stabilizer
1 Sheeted foam Left Stabilizer
1 7/8”x17.25 aluminum Tail tube
Vertical Stabilizer:
1 Sheeted Foam Vertical fin
1 Sheeted foam Rudder assembly
1 Balsa Rudder post

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Assembly:
Note: Before using any glue or cutting of wood, we suggest that you do some pre-assemble to
make sure that you understand the assembly procedure and how the parts fit.
Engine Box assembly
We suggest you use alpihatic resin glue for construction of the fuselage. It is easily cleaned
and allows time for fitting parts together.
Required parts
2) EBS 1) TF
1) F1 1) F2
1) F3 2) aluminum landing gear bracket
1. Mark and drill the motor box sides for the angle aluminum brackets (landing gear
mounts)
2. Glue TF (tank floor) into slots on the right EBS (engine box side). Make sure that
the tabs on TF are facing forward.
3. Glue the left EBS onto TF. Make sure all the tabs are seated in place. Wipe away
any excess glue.
4. Slide F1 into place. Test fit F1 into the EBS and the TF front tabs. When satisfied
with the fit glue in place.
5. Slide F3, (DO NOT GLUE) onto the end of EBS.
Motor Box Assembly Use Aliphatic Resin Sleeve
1. Glue TF into slots in one MBS. Make sure that the tabs on TF are facing forward.
2. Glue other side of TF into slots in second MBS.
3. Glue F1 into the assembly from steps 1 and 2.
4. Glue F2 into place. Secure with tape or rubber bands.
5. Place, but don’t glue the ends of MBS sides into the slots in F3.
6. Bolt in the landing gear mount brackets in place on MBS. Match up the slot and the
boltholes
7. The flat part of F1, F2, and F3 is the top of the fuselage. Turn the whole assemble
upside down so the top of the assembly is resting on your flat work bench, and
place weights on the MBS sides so that the flat part of F1, F2, and F3 is resting flat
on your work bench. Let this assembly dry. Make sure that the sides of the TF are
directly against the sides of both MBS sides, and that all the sides of F1 are directly
against both MBS sides and TF while the assembly dries.

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Fuselage Sides Assembly
A. Join Fuselage Sides
1. Take a long piece of aluminum angle or straight edge (at least 5 ft. long) and lay
it along the top of the FF side. Tape the FF side to the aluminum bar in 3 or 4
places. Lay a small piece of wax paper where the two fuselages sides will be
joined. Now place a bead of glue on the edge of the AFT side where it will butt
to the other side, and butt in against the forward fuselage side. While the glue
sets, set the top of the fuselage side against the aluminum angle or straight edge,
and tape the AFT fuselage side to the aluminum bar. This assures that the entire
top part of the fuselage is straight.
2. At the splice, make a mark 3/8 “ from the edges of the fuselage sides at the top
and bottom. Place the fuselage splice plate FSP over the joint. Note that the slot
on the splice plate is at the bottom of the fuselage side and also note the taper of
the splice plate so it matches the taper of the fuselage side bottom. Check that
the ends of the splice plate are in line with the 3/8 inch mark you made. If
necessary, sand the top and bottom of the splice plate to match the marks you
made. Prior to gluing the splice plate, make sure that the slot on the splice plate
matches up with the slot on the fuselage side. Now glue the splice plate in place.
3. Make pencil marks perpendicular to the top of the fuselage side at the aft part of
the slots. These marks will help to locate the vertical 3/8 balsa stringers and also
keep them perpendicular to the top fuselage sides. Use a triangle or square for
this operation.
4. Take one 3/8 square balsa stick and splice it to one 3/8 square stick to make a
longeron approximately 82 inches long. Use at least a 45-degree angle to
splice the sticks together. Repeat this procedure 3 more times, so you will have
four 3/8 inch square longerons, approximately 82 inches long.
5. Glue the longerons to the top and bottom of the fuselage sides with aliphatic
resin glue. Take extra care that the longerons at the fuselage top line are
exactly with the top of the fuselage sides.
6. After the glue joints for the top and bottom longerons have dried, install the 4
vertical stringers aft of the slot, and lined up with the line you drew in step 3.
The vertical stringer has one side cut at an angle to match the angle of the
fuselage side. When gluing in this stringers, check that you have the angle of the
stringers lined up properly with the angle of the fuselage side.
7. Glue the aft doubler plate in place. When gluing, align the holes for the stab
tube socket by placing the socket in the holes. After you have aligned the
holes, remove the tube socket so it does not get glued in with the doubler.
8. Cut 3/8 in square balsa cross piece stringers, which will be glued to the bottom
formers BF1, BF2, BF3, and BF4. See plans for correct location of the stringers.
Before gluing in the stringers to the formers, make a copy of each stringer,
which will be used for cross pieces at the tope of the fuselage.

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9. Repeat steps A1 thru A7 for the other fuselage side. Make sure you will make
one left side and one right side.
B. Draw Fuselage Top View On Your Workbench
1. Prior to assembling the fuselage, you need to draw the top view of the fuselage
on your workbench. The reason a full size top view is not provided is because
the paper trends to shrink or expand with changes in temperature and humidity,
and will render the drawing inaccurate.
2. Draw a centerline on your workbench approximately 78.5 inches long.
3. At one edge of the centerline, make a line perpendicular to the centerline, 7 5/8
inches from each side of the centerline, for a total width of 15 ¼ inches. This is
where you will line up the front former F1.
4. Now from the F1 line, measure back 78 1/8 inches and draw another line
perpendicular to the centerline 1 ¼ inch from each side of the line, for a total
width of 2 ½ inches. This is the aft end of the fuselage. Draw a line connecting
the front and rear measurements marks you just made. This will form the top (or
bottom) view of the fuselage sides.
5. To aid in the accurate assembly of the fuselage, it is recommended that at least 2
pieces of 1 inch x 1/8 inch x 80 aluminum angles be available. If you have 4
pieces that would be better.
C. Fuselage Assembly
1. Lay one of the fuselage sides on your work bench with the longerons and
stringers facing up. Now, place the motor box assembly on the fuselage side,
matching up the tabs on the motor box assembly with the slots on the fuselage
side.
2. Turn the assembly over, and repeat the procedure with the other fuselage side.
Place aluminum angles on the workbench, and lay the assembly upside down on
top of the aluminum angles, and clamp the fuselage sides to the aluminum
angles.
3. Install, but don’t glue in yet, the wing tube socket into the holes in the fuselage
side and the motor box sides.
4. Now, glue the motor box assembly and former F3 to the fuselage sides. Note
that there are few ways that this can be done. If you have large clamps where
you can clamp formers F1, F2, and F3 to the fuselage sides, then a slow drying
glue such as aliphatic resin or 15 min epoxy can be used. Of course, you will
first have to remove the motor box assembly from the fuselage sides so you can
place the glue, and then reassemble it to the fuselage sides.