Introduction: HPD F1 - Evo

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This is a radio controlled 1:10 scale F1 car intended for competition racing.

Before you start I want to encourage you to be quick to report any problems you encounter. The quicker we correct the problems the easier it will be for the next person.

Any thoughts, question, problems, suggestions may be posted as a comment below or, preferably, more personally on Discord: https://discord.gg/haqPpKY


Supplies

STL files

Chassis: https://cults3d.com/en/3d-model/game/hpd-f1-version-3
Rear axle: https://cults3d.com/en/3d-model/game/hpd-f1-carbon-rear-axle
Front wing: https://cults3d.com/en/3d-model/game/f1-front-wing
Rear wing: https://cults3d.com/en/3d-model/game/crash-resistant-rear-wing-to-f1-cars
Spacer clips: https://cults3d.com/en/3d-model/game/spacer-clips-for-f1
Body: https://cults3d.com/en/3d-model/game/body-fro-hpd-f1-evo

Bill of materials

Following list is for your convenience. If you prefer Torx screws or Tamiya front springs you may try. Feel free to replace to anything compatible. You can probably even use some Imperial measurement screws if you so wish.

Suggestion: Buy more to have spares. The springs are especially easy to lose.

Screws 
	
#   Description	         Part no
8   M3x12 counter sunk   ISO 10642
5   M3x10 counter sunk   ISO 10642
4   M3x8  counter sunk   ISO 10642
0   M3x6  counter sunk   ISO 10642
4   M3x14 button head    ISO 7380
5   M3x12 button head    ISO 7380
4   M3x10 button head    ISO 7380
4   M3x8 button head     ISO 7380
2   M3x6 button head     ISO 7380
3   M3x18 socket head    ISO 4762
2   M4x25 Hexagon head   ISO 4017
1   M3 nut               ISO 4032
2   M4 nylock nut        ISO 7040
2   M4x20 Counter sunk   ISO 10642
Generic parts 
#   Description	               Part no
8   5.8mm ball end             9655000173-0 (Hobbyking.com)
4   5.8mm ball end socket      9655000171-0 (Hobbyking.com)
1   48.5mm Shock absorber      9655000144-0 (Hobbyking.com)
2   Ø3mm x 36mm Steel pin
			
2   6x9mm X-ray side spring    373585       (x-ray)
2   3.6x6mm X-ray front spring 372180       (x-ray)
2   8x12x3.5mm ball bearing
4   6x10x3mm ball bearing
1   Pinion (25T 48 pitch)      #413  (kimbroughracingproducts.com)
1   Spur gear (69T 48 pitch)   #160  (kimbroughracingproducts.com)
1   Servo saver                #114  (kimbroughracingproducts.com)   
2   33mm turnbuckle	
3   Body clips
Electronics 
#   Description
1   Low profile servo	
1   Radio receiver	
1   Electronic speed control	
1   21.5T motor

Step 1: Chassis

3D printed parts:

  File                     Support
  main_chassis.stl         Yes
  front_chassis.stl        No
  front_damper_mount.stl   No

Hardware needed:

  #  Dimension   Description         ISO
  2  M3x12       countersunk screw   ISO 10642
  2  M3x10       button head screw   ISO 7380 
  1  5.8mm       5.8mm ball end      n/a

Ball end is available here: https://hobbyking.com/

Assembly

  1. Insert front chassis into rear chassis. Use the M3x10 screw to hold them together.
  2. Mount the front damper mount with the countersunk screws.
  3. Add the ball end on the rear of the chassis

See video for more info.

Step 2: Front Upper Arms

3D printed parts:

#  File                     Support     Infill
1  upper_arms.stl           Yes         100%
2  camber_socket.stl        No
2  camber_screw_block.stl   No

Hardware needed:

#  Dimension   Description         ISO
2  M3x18mm     Socket head screw   ISO 4762
2  M3x6mm      Button head screw   ISO 7380

From previous steps

2  Ø3mm x 36mm Steel pin

Assembly

See video, steps:

  1. Ensure that the 3mm pin is freely moving, with minimum play, in all holes
  2. Place the camber screw (M3x18mm socket head)
  3. Lock the camber screw with the camber_screw_block, secure with the M3x6mm screw.
  4. Use the camber screw to attach the camber_socket. Carefully, do not screw too far.

Step 3: Front Arms Assembly

3D printed parts:

#  File                     Support     Infill
1  lower_arm_left.stl       Yes         100%
1  lower_arm_right.stl      Yes         100%

Hardware needed:

#  Dimension   Description         ISO
4  M3x12mm     Countersunk screw   ISO 4762

From previous steps

2  Ø3mm x 36mm Steel pin
1  Upper arms

Assembly

See video, steps:

  1. Mount lower arms. NOTICE ANGLE! King pin should lean backwards.
  2. Mount upper arms
  3. Ensure that the king pin is moving freely

Step 4: Motor Pod

3D printed parts:

#  File               Support    Infill   Material
1  pod_front.stl      no         100%
1  pod_left.stl       no         100%
1  pod_right.stl      no         100%     Nylon, PETG or similar
1  pod_rear.stl       no         100%

The motor is mounted on "pod_right" and becomes 70 degrees Celsius. Therefore you will need a heat resistant material in this component.

Hardware needed:

#  Dimension   Description         ISO
5  M3x10mm     Countersunk screw   ISO 4762
2  M3x12mm     Countersunk screw   ISO 4762
1  M3x12mm     Button head screw   ISO 7380 
1  M3          Nut                 ISO 4032

Assembly

See video, steps:

  1. Place a M3x10 screw in the ball clamp, do not tighten yet.
  2. Place the M3 nut into the socket on "pod_right".
  3. Use the M3x12 button head screw to connect the upper part of pod_front and pod_right.
  4. Use a M3x12 counter sunk screw to connect the bottom part.
  5. Use a M3x12 counter sunk screw to connect the bottom part of pod_front and pod_left.
  6. Use the 4 remaining M3x10 counter sunk screws to attach the pod rear.

Step 5: Mount Motor Pod

3D printed parts:

#  File                 Support    Infill
2  motor_pod_stab.stl   no         100%

Hardware needed:

#  Dimension   Description                        Part no
4  M3x14mm     Button head screw  (ISO 7380)
1  48.5mm      Hobbyking shock absorber           9655000144-0
2  5.8x6mm     Hobbyking Ball end                 9655000173-0

From previous steps

1  Chassis
1  Motor pod

Assembly

See video, steps:

  1. Place the m3x14 Button head screws into the motor_pod_stabs.
  2. Place the motor pod on the chassis protruding ball end.
  3. Screw the motor pod stabs on place.
  4. Add the shock absorber.

Step 6: Side Suspension

3D printed parts:

#  File                        Support    Infill
1  side_suspension_mount.stl   no         100%
1  spring_holder_xray.stl      no         -

Hardware needed:

#  Dimension   Description         ISO         Part No
2  M3x10mm     Button head screw   ISO 7380
2  M3x12mm     Button head screw   ISO 7380
2  6x9mm       X-ray Side Spring               373585

From previous steps

1  Assembled Chassis

Assembly

See video, steps:

  1. Screw the M3x12 button head screw to the holes second furthest out.
  2. Screw the spring_holders on the screws
  3. Add side springs.
  4. Thread the side suspension on place.
  5. Secure it on place with the M3x10 screws.

    Step 7: Rear Axle

    Hardware needed:

    #  Dimension   Description
2  8x12x3.5mm  Ball bearing

    From previous steps

    1  Assembled Chassis

    From other project

    Carbon Rear axle : F1 Carbon axle

    Assembly

    See video, steps:

    • Add a spacer washer on the diff side of the axle.
    • Add one ball bearing.
    • Insert the axle in the motor pod.
    • Add the second ball bearing.
    • Add the hex drive (with wheel in the video).
    • Tighten the screws to secure.
    • Do not forget about the wheel nuts.

      Step 8: Motor

      3D printed parts:

      #  File                        Support    Infill    Material
1  motor_clamp.stl   no         100%      100%      PETG/Nylon

      Hardware needed:

      #  Dimension   Description      
1  21.5T       Brushless motor
2  M3x12mm     Button head screw   ISO 7380

      From previous steps

      1  Assembled Chassis

      Assembly

      See video, steps:

      • Insert screws into the holes on the motor clamp.
      • Insert the motor from the bottom.
      • Secure the motor with the motor clamp
      • Add pinion.
      • Adjust gear play

        Step 9: Steering Hubs

        3D printed parts:

          File                     Support
  steering_hub_left.stl    no
  steering_hub_right.stl   no

        Hardware needed:

          #  Dimension   Description         ISO
  2  M3x8        screw               ISO 7380
  2  M4x25       Hexagon head screw  ISO 4017
  2  5.8mm       5.8mm ball end      n/a
  2  Ø3mm x 36mm Steel pin

        NOTE: 1. the M4x25 is replaceable with M4x30. Should be hexagon head though. 2. The ball end can be any ball end of your choice.

        Ball end is available here: https://hobbyking.com/

        Assembly

        NOTE: the steering hubs are asymmetrical. There is a right and left and up and down.

        The "down" side of the steering hub has a small pyramid around the hole for the steel pin (the King Pin) while the upper side is flat.

        1. Ensure that the steel king pin is going trough the steering hub. Leave it in.
        2. Screw in the M3 screw into the steering hub until it holds the steel pin. Then unscrew one turn.
        3. Remove the king pin.
        4. Add the M4 screw.
        5. Add the ball end on the "upper side" of the arm.

          See video for more info.

          Step 10: Front Wheels

          3D printed parts:

            File                     Support
  wheel_bearing_shim.stl    no

          Hardware needed:

            #  Dimension   Description         ISO
  4  6x10x3mm    Ball bearing

          Assembly

          As we are using a 6mm axle instead of the customary 5mm we have to use a different ball bearing to what you are used to. This also means that we need to compensate for the thinner ball bearing by inserting a shim on the inside of it.

            Steps (in video):

            1. Insert shim.
            2. Add ball bearing.
            3. Repeat until done.

            Step 11: Front Suspension

            Hardware needed:

            #  Dimension   Description      
2              Front springs

            From previous steps

            1  Assembled Chassis.
2  Steering hubs.
2  Steel pins.

            Assembly

            See video, steps:

            1. Place steering hub (Note difference between left and right)
            2. Slide steel pin from the bottom until it is flush with the top of the steering hub.
            3. Hold the spring above the pin.
            4. Slide the pin through until it is cresting the upper arm.

              Step 12: Steering Linkage (and Servo)

              Hardware needed:

              #  Dimension   Description      
1              Low profile Servo
1              Servo saver
2  32-38mm     turnbuckles
4              ball ends
4              ball end sockets     
4  M3x8        Counter sunk screws

              From previous steps

              1  Assembled chassis

              Assembly

              See video, steps:

              1. TBW.

                Step 13: Front Wheels

                Hardware needed:

                #  Dimension   Description      
2  M4          M4 nuts

                From previous steps

                2 Front wheels with bearings

                Assembly

                See video, steps:

                1. Attach wheels....

                  Step 14: Rear Wing

                  Hardware needed:

                  #  Dimension   Description      
2  M3x8        Button head screw

                  From previous steps

                  1  The chassis

                  From other project

                  Rear wing: Crash resistant rear wing to F1 cars

                  Assembly

                  See video, steps:

                  1. Attach wing....

                    Step 15: Front Wing

                    3D printed parts:

                    #   Name
1   body_mount_front.stl

                    Hardware needed:

                    #  Dimension   Description      
2  M4x20       Counter sunk screw

                    From previous steps

                    1  Chassis

                    Assembly

                    See video, steps:

                    1. Attach the front wing..

                      Step 16: Mounting Electronics

                      This is mostly a personal choice. Look at picture to get inspiration.

                      Step 17: Secure Battery and Mount Body.

                      3D printed parts:

                      #   Name
1   battery_lock.stl

                      Hardware needed:

                      #  Dimension   Description      
3              Body clips

                      From previous steps

                      1  Chassis

                      From other projects

                      Body: https://cults3d.com/en/3d-model/game/body-fro-hpd-f1-evo