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Assembly Manual / Airframe – 75" Extra 330 LT
Thank you for purchasing this 3DHobbyShop by Extreme Flight ARF RC aircraft. If you have
any issues, questions, concerns or problems during assembly, please contact our tech
department at: Info@extremeflightrc.com or 770-887-1794 10am-5pm Eastern Monday thru
Friday.
SAFETY in Assembly
During assembly of this aircraft, you will be asked to use sharp knives and hobby adhesives.
Please follow all safety procedures recommended by the manufacturers of the products you use,
and always follow these important guidelines:
ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power
tools. Safety glasses are the best way to protect your eyes.
ALWAYS protect your body, especially your hands and fingers when using adhesives, knives,
or tools, especially power tools. Do not cut toward exposed skin with hobby knives. Do not
place hobby knives on tables or benches where they can roll off or be knocked off.
ALWAYS have a first-aid kit handy when working with adhesives, knives, or tools, especially
power tools. ALWAYS keep hobby equipment and supplies out of the reach of children.
SAFETY in Flying
This is NOT a toy! It is a very high-performance RC airplane capable of high speeds and
extreme maneuvers. It should only be operated by a competent pilot in a safe area with proper
supervision.
ONLY fly your aircraft in a safe, open area, away from spectators and vehicles and where it is
legal to fly. NEVER fly over an unsafe area, such as a road or street.
NEVER fly near overhead power or utility lines. If your airplane ever becomes stuck in
a line or a tree DO NOT attempt to retrieve it yourself. Contact the authorities for
assistance in retrieving your aircraft. Power lines are DANGEROUS and falls from
ladders and trees CAN KILL!
Never fly too close to yourself or spectators.
Spinning propellers are DANGEROUS!
Never run your motor inside a house or building with the propeller attached Remove the
prop for safety. Always fly within your control.
Always follow manufacturers instructions for your radio system.
Always preform a pre-flight check of your aircraft to be certain of the aircraft's
airworthiness.
A lways obtain proper insurance before flying. Always fly model aircraft in accordance
with the Academy of Model Aeronautics (AMA) Safety Code. Visit the AMA's website
at
www.modelaircraft.org
for more information.
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Related Manuals for Extreme Flight Extra 330 LT
Summary of Contents for Extreme Flight Extra 330 LT
- Page 1 Assembly Manual / Airframe – 75” Extra 330 LT Thank you for purchasing this 3DHobbyShop by Extreme Flight ARF RC aircraft. If you have any issues, questions, concerns or problems during assembly, please contact our tech department at: Info@extremeflightrc.com or 770-887-1794 10am-5pm Eastern Monday thru Friday.
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Page 2: Limits Of Responsibility
Extreme Flight provides high-quality aircraft and components to it's customers and end users. These aircraft and components are assembled by the end user to produce a flying model. It is beyond Extreme Flight's control to monitor the end user's completed aircraft. Therefore, Extreme Flight in no way accepts or assumes responsibility or liability for damages resulting from the end user assembled product. -
Page 3: Let's Get Started
natural property of balsa wood. As your airplane adjusts to the weather in your part of the world, wrinkles may appear and disappear. Wrinkles may be removed with the gentle application of heat to the covering material on your airplane. The best tools to use are a heat gun and covering iron. Apply the heat gently: the covering material will shrink as you apply the heat, and this will remove the wrinkles. - Page 4 * Note: graphics in manual may differ from your airframe* Install the wheels onto the axles and secure with the wheel collars, as shown. (1.5mm Metric Allen Wrench/Driver) Slide one wheel/axle assembly into a wheel pant as shown above. Be sure to orient the wheel pants to face forward when landing gear is installed on the fuselage.
- Page 5 Install wood screws through gear into pants as shown. (Tip: Drilling a 1/16” pilot hole will ease screw installation) Attach the gear to the fuselage with 4mm screws, use loctite. (3mm Metric Allen Wrench/Driver) Install gear cover plate as shown, using thick CA, epoxy glue or clear silicone.
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Page 6: Tail W Heel
(3/32 Allen Wrench/Driver) Rudder Hinging The 75” Extra 330 LT comes with pre-hinged and pre-gap-sealed wings/ailerons to save time during your build. The airplane also comes with the hinges pre-glued to the rudder and elevator halves to further lessen the work. All tail hinges are the same type and work the same way. The below instructions cover the use of polyurethane and epoxy glue. - Page 7 1) Apply Petroleum Jelly to center hinge joint using cotton swab. 2) Lightly dampen all holes with water. (More important in dry climates)
- Page 8 3) Squeeze in a small amount PU glue into all hinge holes. 4) Install rudder. BE SURE to position tail-wheel tiller wire as shown. 5) Wipe away glue as it expands and foams using rubbing or denatured alcohol. (Keep an eye on it and wipe as required for the first 10-20 mins)
- Page 9 Covering Removal Remove covering from areas indicated above. Recommended covering removal tools: 1) Hobby Knife 2) Soldering Iron (Pencil Tip) 3) Hot Knife...
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Page 10: Horizontal Stabilizer Installation
Horizontal Stabilizer Installation Remove covering over the horizontal stabilizer opening. Insert horizontal stabilizer – DO NOT GLUE YET. Temporarily install the wings onto the fuselage. Builders Tip: Use foam material to hold the horizontal stabilizer in place while aligning. Use a ruler to center and align the stab side-to-side. - Page 11 Using a tape measure or long ruler, measure from the stab to the wing tips as shown in the diagram. Equalize that measurement right and left to be sure your stab is aligned. Double check the side-to-site alignment before proceeding. When stabilizer is centered and aligned, drip Thin CA glue onto the stab-to-fuselage joint top and bottom.
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Page 12: Elevator Installation
Elevator Installation Install joiner into left elevator half using Medium CA. Press firmly into place to assure proper alignment. Allow to dry. Apply glue to left side elevator hinge holes using same method as rudder installation. - Page 13 Slide elevator into position as seen above. Insert hinges and temporarily hold elevator in place using a small piece if masking tape.
- Page 14 Apply Medium CA to right elevator joiner slot. (Test fit before applying glue) Apply glue and position right elevator in place.
- Page 15 Make sure the elevator can swing 45 degrees up and down, minimum. Apply masking tape strips to both elevator counterbalances, allow to dry.
- Page 16 Rudder and Elevator Control Horn Installation Rudder Control Horns for Electric/Pull-Pull set-up. (Short Mounting Tabs) Rudder Control Horn for Gas/DA 35 Push- Pull. (Long Mounting Tabs) Elevator Control Horn Temporarily assemble rudder and elevator control horns for your chosen power system as pictured above without lock nuts.
- Page 17 Remove covering from just inside of marker perimeter. Repeat above steps on LEFT elevator.
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Page 18: Elevator And Rudder Servo Installation
Using plenty of epoxy or polyurethane glue, install the rudder and elevator horns as shown. (or on both sides of the rudder) Use the ball-joint as shown, to hold the rudder horn in perfect alignment while the glue dries. Clean up any excess glue with alcohol. - Page 19 Rudder Elevator Install rudder and elevator servos as shown. Note: Use 18-24” servo extension. A NOTE about servo arms on the 75” Extra LT. The Extra uses ball-links on its controls for precise control- surface motion. It is extremely important to make sure that the ball-links have free motion throughout the servo travel, and do not touch the servo arms.
- Page 20 Install elevator and rudder pushrods using hardware pictured above. NOTE: We recommend the use of one elevator servo with metal gears and at least 100 oz/in of torque. However, enough hardware is supplied in your kit to install a second elevator servo, in “mirror image” fashion, on the other side of the fuselage.
- Page 21 The rudder pull-pull cables are assembled as shown in the diagram. Crimp the crimp tubes firmly with pliers, and use a drop of thin CA glue on each crimp tube after you are done crimping. Crimp the servo end of the cables first. The cables cross once inside the fuselage to form an “X”. Use a lock nut to tighten the ball link into the rudder control horn.
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Page 22: Aileron Servo Installation
Aileron Servo Installation Remove the covering over the aileron servo openings and install the aileron control horns using the same installation techniques from elevator and rudder. Attach the factory installed servo lead guide, gently pull extension through internal wing structure. (6-12”... - Page 23 Builders Tip: Apply a small piece of masking tape to temporarily secure aileron while installing pushrod hardware. Install both aileron pushrods using hardware pictured above.
- Page 24 SFG Installation (Side Force Generator) Locate items pictured above. Your 75" Extra kit includes SFG spacers, SFG's and wing tips, along with four 4-40 screws for mounting. Use the SFG spacers to help locate blind nut mounting holes in the wing tip and SFG’s. Install SFG’s as pictured.
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Page 25: Gas Engine Installation
Gas Engine Installation The 75" Extra can accomodate various gas engines from 30cc to 40cc. See the following suggestions for mounting the DA 35. Use the supplied template to locate mounting holes. - Page 26 Go over motor box joints with thin CA and epoxy as needed. Suggested throttle servo location.
- Page 27 The 75" Extra includes vent covers for the pipe tunnel. We suggest using these to provide maximum cooling. Note: the covering over the vents must be cut out. The 12oz. Forutitude fuel tank is great upgrade. Due to additional vibration of the gas engine, we recommend using the included canopy screws and blind nuts.
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Page 28: Electric Motor Installation
Cut cowl to clear engine Electric Motor Installation Use the included template marked "DLE 30" to locate mounting holes for the included electric motor box extension. Use included hardware to mount motor box extension and electric motor. The electronic speed control may be mounted to the bottom of motor box. -
Page 29: Cowl In S Tallation
Cowl In s tallation Note: Firewall to front of cowl measurement = 6.25" Place a small piece of masking tape on all four cowl mounting tabs, mark the centers. Install cowling and drill 4x holes for mounting screws. - Page 30 9/64 Drill Gas engine users are required to install the four 4-40 blind nuts provided in your kit. Install cowling using (4x) 4-40 mounting screws and washers. Check cowl to spinner fit. NOTE FOR ELECTRIC POWER SYSTEMS For those using electric power systems, the cowling can also be mounted using 4 of the supplied silver wood screws.
- Page 31 Balancing: The 75" Extra 330 LT can use a wide range of center-of-gravity locations. The range is from 5.25” – 6.0” from the leading edge of the wing measured at the root where the wing meets the fuselage. The forward edge of this range will be more nose-heavy for sport and precision flight, the rear edge of this range provides better 3D performance.