Extreme Flight RC 83 inch MXS ARF User manual

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83" MXS ARF
Instruction Manual
Copyright 2012 Extreme Flight RC
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Please take a few moments to read this instruction manual before beginning assembly. We
have outlined a fast, clear and easy method to assemble this aircraft and familiarizing
yourself with this process will aid in a quick, easy build.
Please read the following paragraph before beginning assembly
of your aircraft!
THIS IS NOT A TOY! Serious injury, destruction of property, or even death may result
from the misuse of this product. Extreme Flight RC is providing you, the consumer, with a
very high quality model aircraft component kit, from which you, the consumer, will
assemble a flying model. However, it is beyond our control to monitor the finished aircraft
you produce. Extreme Flight RC will in no way accept or assume responsibility or liability
for damages resulting from the use of this user assembled product. This aircraft should be
flown in accordance with the AMA safety code. It is highly recommended that you join the
Academy of Model Aeronautics in order to be properly insured and operate your model at
AMA sanctioned flying fields only. If you are not willing to accept ALL liability for the
use of this product, please return it to the place of purchase immediately.
Extreme Flight RC, Ltd. guarantees this kit to be free of defects in materials and
workmanship for a period of 30 DAYS from the date of purchase. All warranty claims
must be accompanied by the original dated receipt. This warranty is extended to the
original purchaser of the aircraft kit only. Extreme Flight RC in no way warranties its
aircraft against flutter. We have put these aircraft through the most grueling flight tests
imaginable and have not experienced any control surface flutter. Proper servo selection
and linkage set-up is absolutely essential. Inadequate servos or improper linkage set up
may result in flutter and possibly the complete destruction of your aircraft. If you are not
experienced in this type of linkage set-up or have questions regarding servo choices, please
contact us at [e-mail] or 770-887-1794. It is your responsibility to ensure
the airworthiness of your model.

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Congratulations on your purchase of the Extreme Flight RC 83 inch MXS!
This aircraft is unique in that it is being offered in two versions: A gas/glow version and a
dedicated electric version to satisfy the growing legions of electric power enthusiasts.
There are subtle differences in the construction of these two versions to accommodate the
installation of the chosen power systems. The gas version can be effectively powered by
any of the numerous glow engines in the 1.40-1.80 class or with a 30cc-40cc gas engine.
The electric version will perform best when powered with a 3000+ Watt power system on
8S -12S Lithium Polymer batteries. Either version will allow you to perform aggressive 3D
maneuvers with an economical power plant, allowing you to experience the performance
and stability of a much larger aircraft at a considerable savings.
The Extreme Flight MXS is loaded with unique features, including first rate hardware,
components and thorough instructions to ensure a trouble free assembly and set-up.
Weight saving components are used throughout, such as carbon fiber structural
reinforcement, carbon fiber wing and stab mounting tubes, aluminum landing gear,
titanium pushrods and a carbon fiber tail wheel assembly, all ensuring the lightest, most
high performance aircraft possible. You will notice there is a box built into the bottom of
the glow/gas version of the MXS fuselage. This is a pipe tunnel and will accommodate
most canister mufflers and tuned pipes sold for the current makes of 30-40cc gas engines.
The performance ability of the Extreme Flight RC MXS is phenomenal! This sleek, fast
and agile airframe is completely unlimited in its ability to perform the full range of full
stall high alpha maneuvers and aggressive gyroscopic tumbling maneuvers. The MXS is
rewriting the rule book on ultra-aggressive 3D maneuvers! Unrivaled in pitch and yaw
authority, the MXS will be the machine that introduces a whole new level of gyroscopic
gyrations and insane tumbles to the hardcore 3D masses. Rock solid in all aspects of
current 3D maneuvers, the MXS will give those that fly on the bleeding edge the
confidence and capability to push through and break new ground in expanding the
rapidly evolving 3D flight envelope. Utilizing the same lightweight interlocking laser cut
construction and carbon reinforcement as our Extra, the MXS is capable of handling the
most punishing maneuvers imaginable.
We have spent a great deal of time and effort to provide you, the discriminating aerobatic
enthusiast, with the highest quality, most complete package possible. We are very proud of
the end result of our labor and wish you great success with the assembly and flying of
your Extreme Flight RC 83 inch MXS!
carbon fiber
carbon fiber

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Items needed for completion:
Masking tape.
Hobby knife with #11 blades.
Thin and medium CA. We highly recommend Mercury M5T thin and M100XF
medium formulas as well as the Mercury glue tips.
30 minute epoxy. Mercury Adhesives Epoxies have worked very well for us.
Blue Loctite.
Electric drill with an assortment of small drill bits.
Small flat head and Phillips head screw drivers.
Standard and needle nose pliers.
Side cutter
Metric ball driver or allen key set.
Sanding block and sandpaper.
5 x METAL GEARED servos with a minimum of 300 oz. in of torque.
Aluminum Servo Arms – 2 x 1.75” single arms, 2 x 1.5" single arms and 1 x 4”
double arm.
2 x 6” Servos Extensions
2 x 12” Servo Extensions
2 x 36” Servo Extensions
76mm Spinner
Gas/Glow version
1.40-1.80 class glow engine
30cc-40cc gas engine
Electric Version
3000+ Watt Brushless Power System
100 to 160 amp HV ESC
8S -12S Lithium Polymer batteries

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Tips for Success:
1. Before starting assembly, take a few minutes to read the entire instruction manual
to familiarize yourself with the assembly process.
2. Please take a few minutes and go over all the seams on the aircraft with a covering
iron on a medium heat setting. Also, due to climate changes, wrinkles may develop
in the covering however; these are easily removed with a little bit of heat. Use a
100% cotton tee-shirt and your heat gun and heat the covering while gently rubbing
the covering onto the wood with the t-shirt. Be careful not to use too much heat as
the covering may shrink too much and begin to lift at the edges. Take your time, and
a beautiful, paint-like finish is attainable.
3. Take a few minutes and apply CA to high stress areas such as servo mounting trays,
landing gear mounts, anti-rotation pins, and motor box joints.
4. By the time your aircraft arrives at your door step, it will have been handled by a lot
of people. Occasionally, there are small dings or imperfections on some of the
surfaces. An effective method to restore these imperfections to original condition is
to use a very fine tipped hypodermic needle and inject a drop of water under the
covering material and into the ding in the wood. Apply heat to the area with a
sealing iron and the imperfection will disappear. Deeper marks may require that
this process be repeated a couple of times to achieve the desired result, but you will
be surprised at how well this technique works.
5. Use a high quality epoxy for installing the composite control horns and hinges. We
highly recommend the new Mercury Adhesives 30 minute Epoxy as well as Pacer
Hinge Glue. We very pleased with the results and ease of application and cleanup of
these products.
6. When applying decals, first clean the area where the decal will be applied with
alcohol. Mist the area lightly with Windex or Rapid Tack before applying the decal
which will allow you to properly position it, and then use a rubber squeegee to push
all of the liquid from under the decal. This will result in very few air pockets
trapped under the decal.
7. Take the time to properly balance and trim your aircraft and set up rates and
exponential values. Your flying experience will be greatly enhanced once your plane
is properly dialed in.

Let's begin!
Elevator Assembly
1. Locate the horizontal stabilizer/elevator assemblies as well as the composite control
horns and base plates from the elevator hardware package. Use a sharp #11 blade to
make a cut in the covering over the 2 slots for the elevator control horns on the
bottom of the elevator surface.
2. Insert the 2 control horns into the base plate and trial fit thehorns into the slot,
making sure they seat properly against thebase and elevator surface. If necessary,
sand the bottom of horns to ensure proper fit in the elevators.
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3. Trace around the base plate with a felt tipped marker.
4. Remove the horn assembly and use a #11 blade to remove the covering from inside
the ink line you traced around the control horn base.
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5. Wipe away the ink line with a cotton cloth or paper towel soaked in denatured
alcohol.
6. Use sandpaper to scuff the portion of the horns and base plate that will be inserted
into the elevator.
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7. Apply 30 minute epoxy to the elevator slots, G-10 horns and base plate bottom. Use
a zip tie to ensure the slots are filled will epoxy.
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8. Reinsert the assembly into the elevator and wipe away any excess epoxy with a cloth
and denatured alcohol. Place a 3mm bolt through the horns to help insure proper
alignment and set aside to dry. Repeat for the other elevator half.
9. Next remove the pin hinges from the horizontal stabs. Take note that one pin is
shorter than the others - this is to allow for clearance of the stab tube.
Note: There are several methods and adhesives that can be used for installing the
hinges. We will describe the way we do it as this method has proven itself over many
years of model building.
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10. Use a cotton swab to apply petroleum jelly ONLY to the knuckle of the hinge. This
will keep the epoxy from getting into the hinge which can cause it to bind.
11. Mix a generous batch of 30 minute epoxy. Use a zip tie or an old pushrod to
thoroughly coat and fill the hinge holes on the stab AND elevator with epoxy.
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12. Next, coat one side of all 3 hinges with epoxy and push the hinges into the holes of
the elevator. Remember the short hinge goes in the hole closest to the fuse.
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13. Now coat the other side of the hinges with epoxy and install the elevator into the
stab, making sure the hinge pins are centered in the hinge gap. Don’t forget to apply
epoxy in the hinge holes on the stab before installing the stab to the elevator.
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14. Use denatured alcohol and a cloth to remove all excess epoxy, especially on the hinge
pin. Make sure you have full deflection in both directions – once satisfied with the
results, set the surface aside to dry. After the hinges have dried thoroughly, pull on
them to make sure they are properly installed. Repeat this process for the other
stab/elevator half.
Note: Now is a good time to seal the hinge gap with a strip of Ultracote or Blenderm
tape. Be sure to fully deflect the control surface when sealing the gap to allow for
full deflection once the gap is sealed.
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Wing Assembly
15. Locate the wing/aileron assemblies as well as the composite control horns and base
plates from the elevator hardware package. Following the same procedure as
outlined with the elevator / stabs, install the control horns and hinges for both
wings. Each wing has 5 hinges so it’s best to install the hinges in the aileron first
then mix a second batch of epoxy to install the aileron hinges to the wing.
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Note: Before moving to the next step – it would be a good time to seal the hinge gap
with a strip of Ultracote or Blenderm tape. Be sure to fully deflect the control
surface when sealing the gap to allow for full deflection once the gap is sealed.
Also, take a few minutes to go over the wings with a trim iron on a medium heat to
seal all the trim seams and remove any wrinkles in the covering. Use caution and
avoid excessive heat as you may cause the Ultracote to shrink too much and lift at
the seams.
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16. Locate the aileron servo mount and remove the covering from this area. Use a
sealing iron to seal the edges of the covering to the sides of the servo opening. Take a
few minutes to apply some CA to the joints of the servo rails and the ribs.
17. Attach a 6” servo extension to your servo and secure with thread or heat shrink
tubing. Use the manufacturer supplied mounting hardware to install the servo with
the output shaft toward the trailing edge of the wing. Electronically center the servo.
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18. Use the recommend 1.50” SWB servo arms and attach 2 ball links onto the titanium
turnbuckle pushrod. Secure the pushrod to the control horns and servo arm using
the supplied 3mm bolts, washers, and nylon insert locknuts as shown in the picture
below. As always, use blue Loctite on ALL bolts!
19. Use a soldering iron or a sharp #11 blade to remove the covering from the blind nuts
on the wing tip. This is for attaching the SFG’s or Racing Tips.
Note: Repeat this process for the other wing. Clean the wings with Windex and set
them aside.
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Rudder and Tailwheel Assembly
20. Locate the rudder, the rudder control horns and the 2 slotted base plates. As with
the elevators, use a sharp #11 blade to remove the covering from the 2 pre-cut slots
in the rudder.
21. Before applying epoxy, measure the control horns to ensure they are centered
properly and mark their location with a felt tipped marker. This will make it easy to
reinstall control horns when epoxy is applied.
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22. Scuff the middle of the horns that will go into the rudder as well as the base plates.
23. Mix a generous batch of epoxy and completely fill the two slots as well as the areas
on control horns and base plate that will glue into the rudder.
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