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Century Helicopter Products Hawk III, Instruction Manual

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Century Helicopter Products Hawk III Instruction Manual Download Page 27

STEP 38   Pushrod Setup and Adjustments

STEP 38    

Make up all the control pushrods according to the specified lengths shown in the

drawing.  These are full scale drawings so you can easily match each pushrod to the page.  Please
note that these dimensions listed from end to end of the plastic rod-ends are to be taken as correct.
Fine tuning may be required as the picture size may change when printed.  Also some servos offer
different horn placements for fine tuning.  The numbers in the center of the pushrod drawings are the
actual length of the rods to help select the correct pushrod for each control surface.

Setup for the 5 Channel Helicopter radio, there will be one extra 105mm.
Setup for the 4 Channel Airplane radio, requires one of the 105mm pushrods to be shorten by
  12mm, 6mm per end for use as the Collective Arm Pushrod.

Note:  It is very important that before you install the pushrod linkages that you first charge your radio then remove
all the servo horns from the servos and center all the mechanical or electronic trims on the radio.

Measurements
are tip to tip on
the ball link.

26

15

105 shortened to 93

105

80

75

80

15

128

B (1)  103mm

A (2)  51mm

I (2)  35mm

C (2)  106mm

D (1) 104mm

E (1)  137mm

F (2)
156mm

H (1) 119mm

Washout to Flybar Control Arm

Bell Mixer to Seesaw

Throttle pushrod

Collective (Heli)

Collective (Airplane)

Bell Mixer to Swashplate

Elevator pushrod

Aileron pushrod

Tail Rotor pushrod

All pushrods are
shown full size.

Due to printing, the overall lengths of the pushrods on the right are to be taken as correct.

Pushrod Set
[HW3192]

Ball Link  Set
[HI3145]

G (1)  894mm

J (2)  53mm

Aileron Bellcrank to Swashplate

25

Summary of Contents for Hawk III

Page 1: ...IAMETER 49 5 in TAIL ROTOR DIAMETER 9 3 in OVERALL LENGTH 46 in HEIGHT 16 2 in ENGINE 32 38 BALL BEARINGS 29 Century Helicopter Products Designed and Developed in USA 1st Edition October 1999 HAWK III HAWK III Instruction Manual ...

Page 2: ...ames Step 18 19 15 Upper Lower Frame Assembly Step 20 21 16 Final Rotor Head Assembly Muffler Step 22 23 17 Servo Frame Airplane Step 24 18 Servo Frame Helicopter Step 25 19 Landing Gear Tail Output Shaft Step 26 27 20 Tail Rotor Output Assembly Step 28 30 21 Tail Rotor Hub Grips Step 31 32 22 Tail Guide Drive Shaft Step 33 35 23 24 Tail Boom Drive Strut Step 36 37 25 Pushrod Setup Step 38 26 Radi...

Page 3: ...it can inflict serious injury otherwise It is recommended that if you are doubt of your abilities seek assistance from experienced radio control modelers and associations As manufacturer we assume no liability for the use of this product Pre assembly Information Upon opening the kit all the major component parts are bagged and numbered for ease of assembly which correspond to the sections of the m...

Page 4: ...ents Main Blade Pitch Gauge w PaddleGauge CN2026 Ball Link Plier CN2034 15 or 30 Heli Fuel 12Volt Start Battery 12Volt Starter Fuel Line Eletric Fuel Pump or Hand Pump Glow Starter w Charger 5 5mm 7mm Phillips Screw Driver 4 Way Wrench CN2031 Hobby Scissors Allen Key Set CNBN10946 Hobby Knife Metric Ruler Locktite Servo Tape Lubrication CN2024T Tie Wraps Fuel Filter Glow Plug Whip Antenna Needle N...

Page 5: ... Open End Wrench The tools and materials listed below are the minimum needed to build the helicopter Screwdrivers Slotted and Phillips head Long Nosed Pliers Allen Wrenches 1 5mm 2 0mm 2 5m supplied in kit 3 0mm Appropriate Socket Wrench glow plug wrench for engine shaft nut Scissors Double Sided Foam Tape 1 16 3 32 Foam Rubber radio packing JB Weld bond clutch lining Locktite thread lock liquid H...

Page 6: ...he num bered order thread one M3x6 self tapping screw and one M3x6 Special ball through the offset plates into one tie bar Slide the assembly onto the seesaw shaft and attach the other tie bar from the opposite side Special Ball x 2 HI3167E Completed rotor head 3x7 Ball Bearing x 2 CNBB0730 Tie Bar x 2 HI3167C Seesaw Shaft Set HW3161A M3x6 Self Tapping Screw x2 Rotor Head from Step 1 Bearing Cup x...

Page 7: ...t Ball From parts bag 1 insert the Feathering Shaft into the head block slide one 5X10mm Washer on each side of the shaft Install the blade grip Note the direction of the bell mixer arm and beveled edge is on top of the blade grip followed by one 4x10mm Washer one 4x12mm Washer and one 4mm Locknut Assemble Pushrod I x 2 measuring 35mm end to end distance following the diagram on page 26 and connec...

Page 8: ...eck the distance between the end of the flybar and the control arm and adjust until the lengths are the same and there is no free play between the control arms and the rotor head Remove one set screw at a time apply threadlock and tighten in place Slide the Flybar Weight Tip the flat end of the weight faces the paddle and thread on the Flybar Paddle until all the threads are covered onto the flyba...

Page 9: ...ling the second Guide Block onto the start shaft insert the pin through the hole in the top of the shaft and press the Start Cone over the pin finally secure with one M3x6mm Washer Head Screw from inside the cone using threadlock Apply some lubricant on the shaft after assembly to ensure smooth operation Completed Guide Blocks Note they are installed as shown Starter Shaft HW3005 Start Cone HI3001...

Page 10: ...ngine drive gear assem bly start by pressing the guide pin into the hole in the end of the Drive Shaft Insert the shaft through the Counter Gear make sure the pin is fully seated in the recessed side of the gear then slide the two M5x13 Ball Bearings followed by two oilite bearings Insert one 3x4mm Set Screw into the Alloy Drive Gear then slide the gear onto the shaft taking care to position the s...

Page 11: ...Bearing HW3040 M2x16 Pin Elevator Bellcrank Semi Assembled HI3032A STEP 12 From parts bag 2 apply a small amount of lubricant to the long threaded axle and slide through the elevator bellcrank semi assembled be careful not to get grease on the threads Slide one short spacer over one 3x30mm Socket Cap screw and one 3x7mm washer attach to the threaded axle do not use threadlock here repeat for other...

Page 12: ...l strip out the plastic holes STEP 13 From parts bag 2 install two 4x5mm Set Screws on the Mast Stopper then slide the mast stopper on the main shaft only assemble at this time Slide one M8x19 Ball Bearing on each end of the main shaft against the mast stopper and auto rotation assembly Attach the starter shaft assembly with four 3x12mm Self Tapping Screws1 observe the correct direction of the blo...

Page 13: ... positions and four M3 locknuts It is advised to position the elevator assembly between the side frames at this time to reduce the amount of disassembly later While pulling up on the main shaft make sure the main gear rotates push the mast stopper against the upper ball bearing apply threadlock to the set screws and tighten in place Upper Side Frames L R HI3107 ElevatorAssembly STEP 14 Upper Frame...

Page 14: ...rt the slide tube through the bellcrank using a small amount of lubricant the bellcrank is offset make sure the slide tube is inserted from the flat side Starting on the left side remove the 3x30mm Socket Cap Screw short spacer and washer from the elevator bellcrank previ ously assembled in Step 12 slide the left aileron assembly onto the screw and insert through the left collective lever Apply th...

Page 15: ...the clutch stops torque an additional 1 16 of a turn Using a Piston Lock CN2155 Optional Parts makes this easier Secure the fan by placing one 6 5x13mm Washer and apply a liberal amount of threadlock to secure the nut that came with the engine from the inside of the fan assembly using Again only torque the nut 1 16th more Cooling Fan HI3009 M5x13 Flat Washer Engine Nut Optional Parts CN2153 Thrott...

Page 16: ...cap bend the long aluminum tube upwards make sure the tube comes to the top of the fuel tank and attach the short piece of fuel line and clunk to the short straight piece of tubing Test fit the assembly into the Fuel Tank and make sure that the clunk reaches the end but moves freely and the vent tube is near the top of the tank but does not touch Install the included tie wrap around the outside of...

Page 17: ...e using parts from bag 3 assemble the two halvesusing five 2 6x10mm Self Tapping Screws Install the engine assembly into the lower side frames using four 3x16mm Socket Cap Screws and four 3x7mm Large Flat Washers Position the lower shroud overlapping the upper shroud adjust the engine height by looking from the side slide the engine upwards until the clutchbell gear is properly meshed with the cou...

Page 18: ...he bottom hole in the muffler remember to use threadlock on these parts Speed Torpedo Muffler CN3005HK STEP 22 23 Final Rotor Head Assembly Muffler 17 Following assembly move the collective lever fore and aft to the endpoints The swashplate and washout unit should be very smooth throughout the movement range If not inspect the fit of the washout guide to the pins in the rotor head these pins can b...

Page 19: ...e the screws that came with your servos or the screws provided in the kit Attach the rudder aileron and elevator servos noticing the orientation in to top servo tray Attach the front canopy mount using two 3x30 Phillips Head Machine Screws through the top of the servo tray through the plastic spacer and into the canopy mount STEP 24 Servo Tray Airplane Radio Airplane Radio 4 Channel Setup Rudder S...

Page 20: ...upport Note use the rubber grommets provided with the servos you can use the screws that came with your servos or the screws provided in the kit Attach the rudder aileron and elevator servos noticing the orientation in to top servo tray Attach the canopy mount using two 3x30 Phillips Machine Screws through the top of the servo tray through the plastic spacer and into the canopy mount Helicopter Ra...

Page 21: ...kids HW3123 x 2 M3x16 Phillips Machine Screws x 4 STEP 27 From parts bag 7 notice that the Tail Rotor Drive Shaft has 2 holes one through the shaft and one drilled partially into the shaft Slide the small Bevel Gear with the teeth facing the shaft from the end with the through hole and position the gear aligning the holes Press the 2x12mm Pin through and secure with one 3x4mm Set Screw using threa...

Page 22: ...utput Shaft by sliding two Ball Bearings on to the shaft followed by the large Bevel Gear Align the holes on the gear with the shaft and press in one 2x12mm Pin and secure with one 3x4mm Set Screw using threadlock M3x4SS Set Screw small hex key Gearbox Housing HI3078 Right Hand Side Tail Pitch Plate Assembly STEP 30 Slide two Ball Bearings on each side of the Tail Rotor Drive Shaft assembly and in...

Page 23: ...g threadlock into the bearings M3x4SS Set Screw small hex key Tail Rotor Hub HW3098 M3x10 Socket Cap Screw x 2 Press a steel hollow ball with the flange on the bottom into the Tail Rotor Bellcrank install the Steel Ball threaded from the bottom of the bellcrank and install the tail bellcrank arm on to the tail rotor gear box with one 2 5x16mm Phillips Machine Screw inserted through the brass bushi...

Page 24: ... into the main mechanics the other end needs to have a flat spot 20mm long filed on the round end of the shaft for the two 4x4mm Set Screws in the tail rotor input shaft Thoroughly grease the tail drive shaft and insert the newly filed end into the tailboom end with the slots into the drive shaft housing assembly ensure the end with the new flat spot exits the tailboom end with the round holes and...

Page 25: ...ore closing the gearbox Position the gear box halves over the holes in the end of the tail boom and secure with one 3x10mm Socket Cap Screw and M3 locknut at the end of the gearbox and two 3x12mm Socket Cap Screws with M3 locknuts at the center of the gearbox Install the Vertical Fin with two 3x30mm Socket Cap Screws and M3 locknuts through the mounts in the front end of the tail rotor gearbox M4x...

Page 26: ...o of the pushrod guides infront of the horizontal fin and one behind Attach the Horizontal Fin on the tailboom using two 3x12mm Self Tapping Screws into the Tailboom Clamp and space the fin along the tailboom at the position where the Tail Boom support Tail Strut is attached Note the mount for the strut is angled test fit the strut to position the clamp in the correct direction then secure the str...

Page 27: ...plane radio requires one of the 105mm pushrods to be shorten by 12mm 6mm per end for use as the Collective Arm Pushrod Note It is very important that before you install the pushrod linkages that you first charge your radio then remove all the servo horns from the servos and center all the mechanical or electronic trims on the radio Measurements are tip to tip on the ball link 26 15 105 shortened t...

Page 28: ...hanical trims back to center D R Pos 0 90 90 Exp 20 20 IDLE UP 100 100 0 0 Trim Offset store trim positions after test flying HV T TH CRV 1 3 5 Pos N 0 50 100 IDLE UP2 40 50 100 THR AILE ELEV RUDD GEAR PITCH SPARE SPARE TH HLD set 5 above idle position PG 01T Piezo Gyro Direction N Gain 50 REVO1 Up 30 Down 20 General The parameters here are based on Futaba servos and to be used as a guide in progr...

Page 29: ...r to origi nally set the wheels or arms centered on the servo Futaba cross horn JR round horn Airtronics cross horn 10 mm radius We strive to have all the control surfaces setup linearly this means that as the control stick is moved an equal distance from center that the servo will move a corresponding equal amount of travel Although this is not clear now this will become very clear when adjusting...

Page 30: ...ank Pushrods F some slight adjustment maybe necessary to have the swashplate sit level or 90 degrees to the main shaft when viewed from front or back Move the Aileron stick completely in both directions to insure that there is no binding in the link ages For the Collective Servo attach one steel ball with one 2mm nut to the servo horn at a distance of 10 12mm from the center of the servo using thr...

Page 31: ...between 5 6 mm from the center of the servo whereas the ball for the Throttle Pushrod should be 10 15 mm Install one steel ball and one 2mm nut on the Throttle Extension on the engine check to see that the carburetor is at half throttle or half way open when the arm is pointed straight up the nut holding the arm may need to be loosened and the arm repositioned in the outermost hole using threadloc...

Page 32: ...row of the swashplate It is impor tant that the swashplate sit at 90 degrees to the main shaft Pushrod A x 2 Pushrod C x 2 Step 41 When attaching all pushrods make sure same length pushrods are actually the same length from the beginning otherwise it will be difficult later to figure out where the linkage problems are coming from The entire rotor head is set up the same way for both types of radio...

Page 33: ...g the pushrod hex connector thread the short rudder pushrod and attach the ball link to the servo end Having the radio on and the rudder trim centered press on the servo horn onto the servo set at 90 degrees to the servo and align the rudder bellcrank to 70 degrees as shown in the diagram Install one steel ball into the servo arm from the bottom secured with one 2mm nut Trim the excess of the scre...

Page 34: ...the trim in the center press the servo horn onto the servo so the ball is at 90 degrees to the servo the hover ing position Move the throttle stick to the low idle position and press the Throttle Pushrod B onto the steel balls Check that in the low position the carburetor has about a 1mm wide opening for idling and finally as the trim is moved fully down the carburetor closes completely to shut th...

Page 35: ...nt with two 3x6mm Self Tapping Screws note the location for the mount has to be moved 8mm forward of the marked location on the bottom of the canopy The clear windshield can be attached using six 2x6mm Self Tapping Screws in Bag 4 drill six 1mm holes at the locations shown The two holes for the rear canopy mount have to be moved to 14mm from the rear and bottom edge as shown Attach the canopy usin...

Page 36: ...o Screw 20 M3x25 Phillips Mach Screw 5 M3 Locknut 5 M2x6 Self Tapping Screw 6 Hex Key M1 5 1 Hex Key M2 0 1 Hex Key M2 5 1 Long Ball Link 14 Throttle Extension 1 Steel Ball w 2mm Thread 7 M2 Hex Nut 14 Landing Struts Plastic 2 Landing Skids Metal 2 M3x4 Set Screws 4 M3x16 Phillips Mach Screw 4 Landing Gear Bag In Box Main Mechanics Ass 1 Tail Boom Assembly 1 Instruction Manual 1 Registration Card ...

Page 37: ... add some tape to the lighter blade to balance the rotorhead The same procedure can be used to balance the flybar without the main blades attached Balancing the Rotor Head Attaching Main Blades 36 Receiver Battery Pack and Gyro Controller Using the foam rubber wrap the battery pack receiver and gyro controller mechanical type separately allowing wires to be collected and tied together Using two el...

Page 38: ...B If no hunting occurs at 100 in hover move the rudder pushrod connection one hole outward on the servo 5 Check that the gyro is installed correctly by watching the rudder servo While holding the rotor head move the rudder stick to the right and observe the direction the servo arm moves Now quickly rotate the nose to the left the servo horn should move in the same direction If the rudder servo hor...

Page 39: ...ing Check that all servos move in the correct directions see the diagram on pg 36 Dual Rates For beginners using the flybar weights the dual rate values should be set at 100 for both switch positions until hovering has been mastered Normal position high rate 100 Switch position 1 low rate 75 Now that the servo installation into the helicopter is finished the following pages should be reviewed As v...

Page 40: ... smoother the engine the less adjustment required Not all engine muffler fuel combinations are the same which will shift some of the values shown below 39 Throttle Curve Pitch Curve Low Mid High 10 5 Pitch Range Stick Position 2 9 5 Low Mid High 10 Pitch Range Stick Position 9 5 Low Mid High 50 Stick Position 0 Idle Power Output 100 10 Autorotation Low Mid High Stick Position 50 0 Idle Power Outpu...

Page 41: ...t provide a starting point for the beginner These values correspond to the total travel for the tail rotor pitch To adjust the high setting hold the helicopter at hover and increase the throttle so the helicopter climbs steadily Notice the direction the nose rotates High Stick Setting 40 Low Stick Setting 20 Normal Flight Mode left increase revo value to increase tail pitch right decrease revo val...

Page 42: ...er with substantially reduced risk of crashing These systems provide an on ground training capability to allow pilots to become familiar with the helicopter before actually leaving the ground Pitch In steps 34 35 you setup the pitch range using a pitch gauge and setting the pushrods on the servo horms at specific distances Once the helicopter is flying the pitch setting have to be fine tuned Using...

Page 43: ...or use a rechargeable glow starter Do not connect yet Move the throttle stick to the low position with the trim in the center Look at the fuel line entering the carburetor is there fuel in the line if not pull the fuel line off and check If there is no fuel in the line reconnect and push down on the start cone and turn the engine by hand until you see fuel entering the carb make one more revolutio...

Page 44: ...way 2 Always watch the nose of the helicopter move the rudder left and the nose will move left 3 Start by increasing the throttle slowly until the helicopter rises 2 6 inches off the ground then set it back down 4 Repeat this process until you become comfortable with the holding the model in the same spot for a few seconds then land it After some time at this you can increase the height slightly u...

Page 45: ... Wrap 1 Clutch Shoe 1 Clutch Bell w Gear 1 Ball Bearing M12x18x3 2 Cooling Fan 1 Engine Mount 1 M3x16 Socket Cap Screw 8 M3x11 Flat Washer 4 M5x13 Flat Washer 1 M9x14 Flat Washer 1 Gyro Tray 1 M3x15 Self Tapping Screw 4 Bag 5 Bag 4 Fuel Line 1 Rod Aileron M2 3x128 2 Rod Elevator M2 3x105 2 Rod Coll Swash M2 3x80 3 Rod Throttle M2 3x75 1 M4x30 Socket Cap Screw 2 M4 Locknut 2 M2 3x10 Servo Screw 20 ...

Page 46: ...06 TAIL CONTROL ROD CLAMPS 3 HI3107 UPPER SIDE FRAMES 2 HI3112 LOWER SIDE FRAMES 2 HI3115 SERVO MOUNT FRAME SET 2 HI3122 LANDING STRUTS PLASTIC 1 Hawk Hawk III Upgrade Parts CN0427A Hex start system w hex adapter 5mm CN0402 Hex start adapter only 5mm black CN0520 Carbon torque tube tail drive 2 B B CN2007 Trainer Pod 30 46 w 4 Legs CN2008 Trainer Pod 60 Gas w 6 Legs CN2015 Hardened Tip Hex Wrench ...

Page 47: ... CN2120 Dual B B tail assembly The only way to balance fly bar and eliminate excess vibration caused by out of balance paddles 3mm 4mm Fly Bar Weights CN2029A 3mm weights 30 46 7 95 Neon Glow Color Hot Dog Paddles 3D switchless inverted pilots must try out these lightning quick paddles CN2079Y NeonYellow CN2079R Glow Red CN2079O Glow Orange Hot Dog Flybar Paddle w Weights 3D Hot Dog pilot can t mi...

Page 48: ... canopy and never lose canopy screws again purple Hawk Falcon Phoenix CN2210 Quick Mounts Metal Clutch Bell CN2225 Clutchbell w gear HI3010A Bell only HI3010B 2 Stroke Gear 26T HI3010C 4 Stroke Gear 33T CN2020L Clutch lining 2 30 Size Metal Swash plate This beautiful CNC precision machined aluminum swashplate will increase acrobatic 3D maneuverability black Look Hawk 30 CN2056 Metal swash plate 8m...

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