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RJX Hobby X-Treme 90 Instructions Manual

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Technical Data:

Overall Length
Overall Height
Overall Wide
Main Rotor Diameter
Tail Rotor Diameter
Gear Ratio
Gross Weight
PLEASE READ AND UNDERSTAND THE INSTRUCTIONS THOROUGHLY BEFORE ASSEMBLY
1340 mm
430 mm
210 mm
1690 mm
281 mm
8.1.8:1:4.7 + 8.4.5:1:4.7
4300g - 4600g

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Summary of Contents for RJX Hobby X-Treme 90

  • Page 1 Technical Data: 1340 mm Overall Length 430 mm Overall Height 210 mm Overall Wide 1690 mm Main Rotor Diameter 281 mm Tail Rotor Diameter 8.1.8:1:4.7 + 8.4.5:1:4.7 Gear Ratio 4300g - 4600g Gross Weight PLEASE READ AND UNDERSTAND THE INSTRUCTIONS THOROUGHLY BEFORE ASSEMBLY...
  • Page 2 It may look easy when watching an experienced pilot flying his model, but perseverance and hours of practice will needed before you will be able to fly and opperate the model safely. RJX HOBBY suggests you join a club or seek help from an experienced pilot to help you in your first hops off the ground and then as with all things the more you practice the better you will become.
  • Page 3 TABLE OF CONTENTS 1. Introducion 2. Table of contents 3. Additional Items Required 4. Tools Required A1 - A33 5. Assembly S1-S4 6. Servo Installation 7. Servo Adjustment S5-S6 8. Rotor Head Setup 9. Final Servo and Radio Setup R1-R5 10.
  • Page 4 ADDITIONAL ITEMS REQUIRED TO COMPLETE THE Gyro system with Choose a CCPM compatible PCM Radio System for Three large and two small disks or Heading Hold Helicopters with a minimum of 6 channels. arms are required 90 Size glow engine,OS 91, YS91 90 Size Muffler (for kits without Muffler) 1,5V Glow Plug Battery Helicopter fuel:...
  • Page 5 TOOLS REQUIRED (NOT INCLUDED) Allen Drivers 1,5mm - 2mm - 3mm - 4mm Phillips Drivers Large,Middle, Small Nut Drivers 4,5mm - 5,5mm - 7mm Scissors Universal Pliers Cutter Sandpaper Pitch Gauge Ball Link Plier Metric Ruler Grease Cyanoacrylate (CA/Superglue) Epoxy 30 Minutes Universal RC Cross Wrench Ball Link Driver Ball Link Tool...
  • Page 6 STEP 1-1 Clutch Bell / Starter Shaft BB Block Assembly USE THREADLOCK IMPORTANT: USE THREADLOCK IMPORTANT: Before assembling sand the inner side of the clutch bell and the side from the clutch liner you will glue in.Use 30 minutes EPOXY to glue the liner in the clutch bell and fix them with some clips to ensure a good and thight fit of the liner.
  • Page 7 STEP 1-2TT Tail Drive Pinion Gear Assembly (TT Version) USE THREADLOCK IMPORTANT: Start assembly with the OUTPUT SHAFT. Tail Drive Pinion TT Gear Box View of the complete Assembly. 5x7x1 Washer Check that the gearmesh is correctly (if necesary add a 0.2mm Nylon Washer) and 19T Delrin Beevel Gear the assembly rotated freely but without play.
  • Page 8 STEP 1-4 Fuel Tank and AUX Tank Assembly NOTE: For easy assambling of the Exhaust Pressure Nipple use a thin cable binder passing it throug the nipple. Main Tank AUX Tank M5 Special Nut Exhaust pressure nipple To Main Tank Tank Nipple Fuel Clunk Silicon Tube 40mm...
  • Page 9 STEP 1-6 Swash Control Assembly USE THREADLOCK Nick Arm M4x4 Setscrew 4mm Ball Arm Joinball Swash Lever M2x6 Socket Head Bolt View of the completed Assembly STEP 1-7 Front Tail Arm Assembly USE THREADLOCK CAUTION: Do NOT over tighten the M3x20 bolts to avoid breaking the bearings.
  • Page 10 STEP 1-8 Battery Tray Assembly BATTERY TRAY inside the bag of the MAIN FRAME USE THREADLOCK M3x6 Countersunk Head Bolt Battery Tray Special Crossmember View of the completed Assembly from both side STEP 1-9 Canopy Stands BREAKOFF are inside the bag of the MAIN FRAME USE THREADLOCK 32mm Crossmember Breakoff...
  • Page 11 STEP 2-1 Main Frame Assembly (TT+Belt) USE THREADLOCK Main Frame Right Holes to be used Main Frame Left M3x8 Socket Head Bolt M3x8 Socket Head Bolt Bottomplate Mounting Block M3x8 Socket Head Bolt CAUTION: Bottomplate Mounting Block The main frame sides are NOT the same. Look at the L and R writing cutout on the frame sides to ensure that you have the correct sides.
  • Page 12 STEP 2-3B Main Frame Assembly (Belt Version) USE THREADLOCK Main Frame Right (Assembled in Step 2-2) Tail Drive (Assembled in Step 1-2B) View of the completed Assembly M3x8 Socket Head Bolt M3x10 Socket Head Bolt with Finish Cap´s Holes to be used IMPORTANT: DO NOT use Threadlock in this stage for the Bearing Blocks, for later adjustment.
  • Page 13 STEP 2-4 Main Frame Assembly (TT+Belt) Swash Guide USE THREADLOCK M3x10 Socket Head Bolt Rear Gyro Mount Frame Stiffner Canopy Mount Front Gyro Mount M3x8 Socket Head Bolt View of the completed Assembly NOTE: DO NOT use thread lock on the Bolts for the Main Shaft BB Blocks.
  • Page 14 STEP 2-5/2 Main Frame Assembly (TT+Belt) M3x10 Socket Head Bolt with Finishcup CAUTION: Ratio Modul Left Depending on witch Engine Type used (90T Main Gear) must be selected diferent Ratio Mounts. For Os91 Types and YS 91 SR must be used the Mount with 90 indicated for a 8,18 Ratio.
  • Page 15 STEP 2-7 Main Frame Assembly (TT+Belt) IMPORTANT: USE THREADLOCK When securing the main shaft, pull it upwards through Main Shaft the main bearings to eliminate any freeplay. Next press NOTE: the main shaft collar firmly onto the upper bearing block Ensure the correct way and fix with threadlock the four M4x4 set screws.
  • Page 16 STEP 2-9 Main Tank (Engine WITHOUT Tank Preasure) USE THREADLOCK NOTE: Use CA to fix the Tank Rubbers in the corners of the Main Frame. Main Shaft Collar Tank Rubber Tank Rubber M3x10 Socket Head Bolt M3x10 Socket Head Bolt with Finishcap with Finishcap View of the completed Assembly...
  • Page 17 STEP 2-10 Main Frame Assembly (TT+Belt Version) USE THREADLOCK Bottom Plate Engine Mount (Middle) M3x10 Socket Head Bolt with Finish caps STEP 2-11 Landing Skid Assembly Note: For extra strength place a second Landing Strut.On the NOTE: top of both sides and the other on the lower part of the Assemble two sets.Do NOT tighten the screws for later adjustment.
  • Page 18 STEP 2-12 Landing Gear Assembly NOTE: Place the complete assembly on a flat surface.Do NOT tighten the screws yet Landing Skids ca. 20mm View of the completed Assembly STEP 2-13 Landing Gear Assembly NOTE: USE THREADLOCK Place the complete frame after assembling on a flat surface and tighten the screws from the Landingskid assembly.Insure that the the skids are flat on the surface.
  • Page 19 STEP 3-1 CLUTCH/COOLING FAN ASSEMBLY USE THREADLOCK NOTE: If a drive washer is included with the engine you willl need to remove this. (Contact your dealer for information). For M4x10 Socket Head Bolt OS Engines, the thin black washer supplied will be used under the bottom collet.
  • Page 20 STEP 3-2 ENGINE INSTALATION M4x16 Socket Head Bolt View of the completed Assembly Spring Washer Engine Mount L/R IMPORTANT: For the 8,45 Ratio you need to add the two delivered 1.5mm Spacers between the Engine and the Engine Mount IMPORTANT: Do NOT tighten the srews for later alignment.
  • Page 21 STEP 3-4 ENGINE-PINION GEAR LINEOUT IMPORTANT about GEAR MESH: In order to archive smooth operation of the main drive train, it is important that the correct gearmesh is obtained after assembly. Try to mesh the gears to get the minimum amount of backlash and the smoothest rotation. Remember that too little clearence and the train will be too stiff to work properly and too much clearance may result the teeth stripping off when under load.
  • Page 22 STEP 4-1 SWASHPLATE ASSEMBLY USE THREADLOCK 4mm Ballarm (7) Swash Guide Pin View of the completed Assembly STEP 4-2 WASHOUT ASSEMBLY USE THREADLOCK Washout Base Washout Arm M2x10 Socket Head Bolt View of the completed Assembly Jointball Washout Arm Washer 3x5x1 M3x12 Socket Head Bolt NOTE: NOTE:...
  • Page 23 STEP 4-3 SWASHPLATE / WASHOUT INSTALLATION BOTTOM IMPORTANT: Insure the correct direction View of the completed Assembly NOTE: Attach the two Washoutlinks to the swash plate. STEP 4-4 SEESAW INSTALLATION USE THREADLOCK M3x10 Socket Head Bolt Rotor Stopper Seesaw Centerhub M4x6 Socket Head Bolt M4x6 Socket Head Bolt View of the completed Assembly...
  • Page 24 STEP 4-5 MAIN BLADE HOLDER ASSEMBLY M3x6 Socket Head Bolt Pitch Arm Main Blade Holder NOTE: Assemble 2 sets of the Main Blade Holder. View of the completed Assembly Detailed adjustments in Step ..STEP 4-6 MIXER ARM ASSEMBLY IMPORTANT: NOTE: Mixer settings are explained on Page Rh1 more detailed.
  • Page 25 STEP 4-7 MAIN ROTOR HEAD ASSEMBLY NOTE: USE THREADLOCK Use silicon grease for the dampers. This also needs to be reaplied as part of your on going maintenace (after Spindle about 30 to 40 flights) to ensure that the dampers not getting dry. Damper Thrust Washer Spindle Collar...
  • Page 26 STEP 4-9 MAIN ROTOR HEAD ASSEMBLY USE THREADLOCK Jesus Bolt M4x8 M3x14 Socket Head Bolt M3x14 Socket Head Bolt Jesus Bolt M4x8 Set Screw M3x4 Phase Ring Set Screw M3x4 View of the completed Assembly STEP 4-10 CONTROL ROD INSTALLATION Link A NOTE: The size of the linkage rod can variate depending...
  • Page 27 STEP 4-11 CONTROL ROD INSTALLATION NOTE: USE THREADLOCK Assembly both sides of the flybar control arm on the same way. M2,5x12 Socket Head Bolt M2,5x12 Socket Head Bolt Flybar Control Arm Linkrod Linkage Rod B Linkage Rod A Linkage Rod C STEP 4-12 ROTOR HEAD SETUP IMPORTANT: SECURE ALL JOINT BALLS AND SCREWS WITH THREADLOCK USE THREADLOCK...
  • Page 28 STEP 4-12 MAIN ROTOR HEAD ASSEMBLY USE THREADLOCK Ensure the two M4x4 Sets Screws are on the D-Cut of the Flybar. IMPORTANT: Flybar Paddle Insure the correct direction of the Flybar Paddle. M4x4 Set Screw Flybar Paddle NOTE: Adjust so that A and B are exactly the same distance and secure with the M4x4 Set Screws firmly.
  • Page 29 STEP 4-13 ROTOR HEAD SETUP In the diagrams below are explained the different settings posibilitys of this rotor head. There are many setups with different results. Adjust this settings on demand of you and your capability. Some of the settings can produce binding. Ensure that the ATV settings in the radio and linkage rod adjustments allowing no bindings.
  • Page 30 STEP 5-1B TAILCASE ASSEMBLY (Belt Version) USE THREADLOCK Pin 14mm M3x4 Set Screw Tail Pulley 10T IMPORTANT: Ensure to enter the side with the screw hole in the tailcase first, to secure the 14mm pin with the M3x4 Set Screw. Tail Shaft Tailcase View of the completed Assembly...
  • Page 31 STEP 5-2B TAILCASE ASSEMBLY (Belt Version) NOTE: USE THREADLOCK Do not over tighten the M3x20 bolts to avoid breaking the bearings. M2x6 Socket Head Bolt M3x20 Socket Head Bolt Washer 3X5x2 Jointball Tail Pitch Control Lever Washer 3X5x2 View of the completed Assembly STEP 5-2TT TAILCASE ASSEMBLY (TT Version) USE THREADLOCK M3x20 Socket Head Bolt...
  • Page 32 STEP 5-3 TAILCASE ASSEMBLY (TT+Belt Version) USE THREADLOCK NOTE: Check that the Joint ball is working freely and smoothly in the tail pitch control lever. IMPORTANT: Check the pre installed assemply and add red threadlock View of the completed Assembly on the copper sleeve if necessary.
  • Page 33 STEP 5-5 TAILCASE ASSEMBLY (TT+Belt) USE THREADLOCK NOTE: Clip the linkage into the jointball and check that the assembly works smooth. M4x4 Set Screw IMPORTANT: Fix the two M4x4 Set Screw into the holes from the tailshaft. View of the completed Assembly STEP 5-5TT Torque Tube ASSEMBLY ca.180mm View of the completed Assembly...
  • Page 34 STEP 5-6B TAILCASE ASSEMBLY USE THREADLOCK 20mm Spacer M3x8 Socket Head Bolt View of the completed Assembly 700XL Tail Belt STEP 5-6TT Torque Tube ASSEMBLY USE THREADLOCK Torque Tube M2,5x4 Socket Head Bolt View of the completed Assembly TT Coppler with Oneway Bearing...
  • Page 35 STEP 5-7 TAILCASE ASSEMBLY (Belt Version) USE THREADLOCK M3x10 Socket Head Bolt M3x6 Socket Head Bolt Assembled in Step 5-6 Finish Cap Finish Cap View of the completed Assembly Vertical Fin Tailboom STEP 5-7TT TAILCASE ASSEMBLY USE THREADLOCK Assembled in Step 5-6 M3x6 Socket Head Bolt M3x10 Socket Head Bolt Finish Cap...
  • Page 36 STEP 5-8 TAIL BOOM INSTALATION (Belt Version) NOTE: Introduce the complete Tail Assembly into the Tail Boom Holder as shown in the diagram, Next .The Tail Rotor is pointing downwards. Place the tail belt on the Front Pulley and check the Tail Belt is not twisted (You need to take out the lower BB Mount and Main Tank).
  • Page 37 STEP 5-9 TAIL BRACE ASSEMBLY (TT+Belt Version) IMPORTANT: Sand the ends with sandpaper and apply epoxy glue. Also sand the inner of the metal supports. Metal End 4x6 CF Tube NOTE: Place a long M3 Screw like shown in the diagram on both ends. This way you ensure they are exactly Metal End parallel.
  • Page 38 STEP 5-11 TAIL BRACE INSTALLATION (TT+Belt Version) USE THREADLOCK M3x10 Socket Head Bolt M3x10 Socket Head Bolt View of the completed Assembly Tail Brace NOTE: Fix the two M3x10 Socket Head bolt form M3x25 Socket Head Bolt the Horizontal Fin with Threadlock in this Step M3x25 Socket Head Bolt 12mm Spacer 32mm Crossmember...
  • Page 39 STEP 6-1 SERVO INSTALLATION(CCPM Servo) IMPORTANT: Depending on servo type used for cyclic, you have to install the servo from inside the frames.When installing from outside the servo horn may touch the canopy. Servo Mounting Plate (inside) In the diagram below you see how to insert the servo into the frames.
  • Page 40 STEP 6-3 SERVO INSTALLATION (Tail Servo) NOTE: For more easier assembly use CA glue to fix the Servo Mounting Plates before installing the servo. Servo Mounting Plate(from inside) Servo(from OUTSIDE) 2,6x12 Selftapping Screws Washer 2,6x7x1 STEP 6-4 SERVO INSTALLATION(Throttle Servo) NOTE: For more easier assembly use CA glue to fix the Servo...
  • Page 41 STEP 6-5 RECEIVER / GYRO / BATTERY INSTALLATION 1. Install the Battery and Receiver Gyro Amp or Governor Amp Install the Gyro sensor NOTE: a) Be sure to keep all the lead wires. etc., away from all servo arms,rods and sharp edge of the helicopter mechanics.
  • Page 42 STEP 6-6 SERVO ARM PREPARATION AND INSTALLATION NOTE: USE THREADLOCK Before attaching any of the servo output arms, turn on your radio and check that all of the primary control functions and trims are set to neutral. Pay special attention to the throttle/pitch channel where the stick has to be positioned manually unless your transmitter has a digital or graphical display of the output.
  • Page 43 STEP 6-7 LINKAGE CONNECTION NOTE: Assembly the linkage as shown below Check the correct side of the link with the logo. 1. RIGHT SERVO RJXHOBBY Use two large links 56 mm and a 2,6x30mm rod. RJXHOBBY 90º RJXHOBBY ca.117mm Use four large links and two 2x90mm rod.
  • Page 44 STEP 6-8 LINKAGE CONNECTION ca.83,5mm 4. THROTTLE SERVO 90º Use two large links and one 2x60mm rod. RJXHOBBY IMPORTANT: Ensure that the carburator is 50% open in this position.Readjust the carburator arm if not. NOTE: To avoid differential throttle travel, make certain both the throttle arm and the servo horn are positioned as shown next in the diagram.
  • Page 45 STEP 7-1 PHASE RING ADJUSTMENT USE THREADLOCK NOTE: Once the swashplate is leveled it is important to set the phasing of the the washout base. This is done by rotating the rotor head until the flybar is perfectly in line with the body and the tailboom of the helicopter (see the diagram next).
  • Page 46 STEP 7-2 CANOPY ATTACHMENT NOTE: Put the rubbers grommets for about 3 min. in hot water to insert them more easier in the canopy. Rear Canopy Mount Front Canopy Mount Fixing point NOTE: Use the Thumb Screws to secure the canopy to the body of the helicopter STEP 7-3 MAIN / TAIL BLADE INSTALLATION Washer 3x7x1,5...
  • Page 47 STEP 8-1 FINAL SERVO AND RADIO SETUP Rudder and Throttle Servo Adjustments 1.Checking the servo rotation. With the radio transmitter and receiver switched on, move the rudder and throttle sticks, and check that each servo moves in the correct direction. If either servo moves in the wrong direction, it will be necessary to reset that servo using the appropriate reversing function on your transmitter.
  • Page 48 STEP 8-2 FINAL SERVO AND RADIO SETUP Now that the radio system is fully installed the following items require precise adjustment to achieve the best results. 1. Dual Rates If dual rates are available for the aileron, elevator and rudder channels, then please ensure that they are all set to the same position for high and low ie.
  • Page 49 STEP 8-3 FINAL SERVO AND RADIO SETUP 7.Collective Pitch Setup. A Pitch Gauge will be required for this operation MIDDLE HIGH NORMAL -4º +5.5º +10º IDLE UP -10º 0º +10º +14º -14º 0º AUTOROTATION The total pitch range of the is approximately 30 degrees depending the rotor head settings you have done.
  • Page 50 - Check that the main and tail rotor blades are installed correctly. - You are now ready for your first flight with the X-TREME 90 and your next step is the adjustment of your engine. Since this depends on the fuel, plug...
  • Page 51 STEP 8-5 FINAL SERVO AND RADIO SETUP Caution: Be sure to maintain a safe distance of at least 5 meters from the helicopter when observing the track of the main rotor disc. Blade tracking ensures that both of the main blades are set to the same pitch angle, and if done correctly will make your helicopter smooth in operation. Out of Track Adjustment is necessary Caution: Be sure to maintain a safe distance of at least 5 meters from the helicopter when observing the tracking...
  • Page 52 PLEASE READ BEFORE FLIGHT is the perfect choice for intermediate and expert level R/C Helicopter pilots, however, Radio controlled models such as this can crash and cause serious damage to people and property if not properly assembled and flown with great care. Please exercise the highest levels of caution and safety when operating this model and if you are a beginner, please seek help from an experienced RC heli pilot.

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