background image

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: 

[email protected]

 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.

Always 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.

Summary of Contents for Extra 330 LT

Page 1: ...pment 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...

Page 2: ...lips Screwdriver Set Metric Allen Wrenches Scissors Small Pliers Wire Cutters Adjustable wrench Masking tape Drill and drill bits Threadlocker Blue Loctite Optional Heat gun and covering iron Dremel tool Assembly Instructions Read completely before starting assembly UNPACK Unpack your airplane and examine the components Check for damage of any kind If you have damage please contact Extreme Flight ...

Page 3: ... at seams and corners or even by melting it The covering will shrink at low temperature with patient application of heat Wrinkles in the covering DO NOT affect flight performance If you must shrink on a color seam use the iron and go slowly and carefully to avoid any pulling or lifting at the seam Remove the canopy before attempting to use heat on your covering The canopy is made of thermo activat...

Page 4: ...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 Tighten the locknut as shown to secure the assembly onto the gear leg Repeat for other side 10mm Ny Lock Nut 4 Note graphics in manual may differ from your airframe ...

Page 5: ...ts 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 5 ...

Page 6: ...pecific RC hinge glue follow the direction on the hinge glue bottle Quick HOW TO use PU Polyurethane glue Using hinge installation as the example 1 Apply Petroleum Jelly to center hinge joint using cotton swab 2 Lightly dampen all holes with water More important in dry climates 3 Squeeze in a small amount PU glue into all hinge holes 4 Install hinges 5 Wipe away glue as it expands and foams using ...

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 7 ...

Page 8: ...ue 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 8 ...

Page 9: ...Remove covering from areas indicated above Recommended covering removal tools 1 Hobby Knife 2 Soldering Iron Pencil Tip 3 Hot Knife Covering Removal 9 ...

Page 10: ...orizontal stabilizer DO NOT GLUE YET Temporarily install the wings onto the fuselage Use a ruler to center and align the stab side to side Horizontal Stabilizer Installation Builders Tip Use foam material to hold the horizontal stabilizer in place while aligning 10 ...

Page 11: ... proceeding When stabilizer is centered and aligned drip Thin CA glue onto the stab to fuselage joint top and bottom NOTE We do not remove any covering form the horizontal stabilizer This keeps the stabilizer strong and thin CA makes an excellent joint to covering material If your stab joint is not tight enough for thin CA glue or if you have to trim the opening to align the stab you can use thick...

Page 12: ... 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 Elevator Installation 12 ...

Page 13: ...Slide elevator into position as seen above Insert hinges and temporarily hold elevator in place using a small piece if masking tape 13 ...

Page 14: ...Apply Medium CA to right elevator joiner slot Test fit before applying glue Apply glue and position right elevator in place 14 ...

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 15 ...

Page 16: ...er CG Electric power systems use Pull Pull rudder set up DA 35 Gas Engines use tail mounted Push Pull rudder set up Proceed to next page 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 Rudder and Elevator Control Horn Installation 16 ...

Page 17: ...Remove covering from just inside of marker perimeter Repeat above steps on LEFT elevator 17 ...

Page 18: ...he ball joint as shown to hold the rudder horn in perfect alignment while the glue dries Clean up any excess glue with alcohol Allow to dry Instructions for pull pull rudder set up starting on page 20 Remove covering from Elevator Left and Rudder Right servo hole openings as seen above Elevator and Rudder Servo Installation 18 ...

Page 19: ... 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 For example when using Hitec servo arms this is easily accomplished by cutting or sanding away the corner of the arm as shown Rudder Elevator 19 ...

Page 20: ...ue 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 Note that this may result in a tail heavy condition unless you are using a large and heavy power system Install the rudder servo servo arm and ball links with locking nuts as shown Pull Pull Rudder Cable Installation 20 ...

Page 21: ... 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 Assemble the cables onto the pull wire ends pulling the cables snug before crimping We do not need the cables to be extremely tight just snug and without sagging Use the threaded pull cable ends screwing them into the ball joints as necessary to tighten the ...

Page 22: ... 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 Servo Extensions depending on receiver location Aileron Servo Installation 22 ...

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 23 ...

Page 24: ...ra 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 SFG Installation Side Force Generator 24 ...

Page 25: ...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 25 ...

Page 26: ...Go over motor box joints with thin CA and epoxy as needed Suggested throttle servo location 26 ...

Page 27: ...for the pipe tunnel We suggest using these to provide maximum cooling Note the covering over the vents must be cut out Due to additional vibration of the gas engine we recommend using the included canopy screws and blind nuts The blind nuts must be installed on the tabs as shown 27 ...

Page 28: ... 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 This allows maximum cooling 28 Cut cowl to clear engine ...

Page 29: ...ce a small piece of masking tape on all four cowl mounting tabs mark the centers Install cowling and drill 4x holes for mounting screws Cowl Installation Note Firewall to front of cowl measurement 6 25 29 ...

Page 30: ...provided in your kit 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 Install cowling using 4x 4 40 mounting screws and washers Check cowl to spinner fit 9 64 Drill Bit 30 ...

Page 31: ...erted is often better for precision flight and is much easier to land gracefully Control Throws Throws are given both in degrees and in millimeters measured at the end of the surface where the throw is greatest Ailerons Low Rate 15 degrees 30 exponential High Rate 30 degrees 70 exponential Elevator Low Rate 15 degrees 30 exponential High Rate Maximum possible throw at least 45 degrees 75 exponenti...

Reviews: