Building EVO 4 Competition - Hoglet/HPD_F1 GitHub Wiki

EVO 4 Competition is under development as is this instruction:

Before starting to build you should consider that this model can be used as a parking lot basher, a competition racer or something in between.

You do not need adjustments of camber or a differential when driving for fun. So you can use the non adjustable upper arms (2 turnbuckles less) and threaded rods for steering linkage and the simple printed rear axle provided.

You might still not need camber adjustment but you should use a better rear axle. Either you buy a third party differential axle or you print and manufacture your own with carbon tubes. Different bearings are needed for all those choices. You also need to print the motor mount in something heat resistant as motors are getting hot during competitions, but you probably already knew that.

For a the basher then more impact resistant PLA is recomended (Esun PLA+ and Polymaker PolyMax are two great alternatives)

For competition you should consider to print the most exposed parts in something stronger like Prusament PC blend.

Note: This list contains "hex" screws but you may use equivalent torx, philips or other system of your choice. Lengths are also more of a recommendation, you may often use longer or shorter screws.

Look at this conversion table Screw Standards

Amount	Description	Part no	Comment
2	M4x20 counter sunk screw	ISO 10642	For mounting front wing
2	M4x25 Hexagon head screw	ISO 4017	For front axle
2	M3x35 Hexagon head partially threaded	ISO 4014	King pins. You might use equivalent socket head screws instead
7	M3x14 counter sunk screw	ISO 10642	Pod swivel mounting and steering linkage
50	M3x10 counter sunk screw	ISO 10642
2	M3x12 button head screw	ISO 7380	For mounting rear wing
2	M3x20 button head screw	ISO 7380	Side spring adjustment
6	M3x10 socket head screw	ISO 4762	Smooth outside, not serrated! Ensure socket cap heads for front arm pivots are to specification and have a diameter between 5.32 - 5.5mm, smaller will result in excess play
8	M3x16 grub screw	ISO 4026	For side shocks and droop adjustment
1	M2x10 socket head screw	ISO 4762	Pod stabilization screw, buy spares as they might bend

Amount	Description	Part no	Comment
2	M3 nut	ISO 4032	Securing king pin
2	M4 nylock nut	ISO 7040	Securing front wheels

Amount	Description	Part no	Comment
3	8x12x3.5mm ball bearing		Servo saver
4	6x10x3mm ball bearing		Front wheels
2	10x15x4mm flanged ball bearing		For printed rear axle
2	8x12x3.5mm flanged ball bearing		For Carbon rear axle
1	2x6x3mm ball bearing		Pod stabilizer

Amount	Description	Part no	Comment
5	5.8mm ball end	Traxxas 1942
2	M3x24mm turnbuckle	-	For camber. 24mm long threaded M3 rod is also usable
2	M3x35mm turnbuckle	-	For toe/steering. 35 mm long threaded M3 rod is also usable
1	M3x45mm turnbuckle	-	For servo linkage. A threaded rod also works
1pr	Front Wheels and tyres		Ask at your local track or in our discord forum
1pr	Rear Wheels and tyres		Ask at your local track or in our discord forum
1	Low profile std servo
1	Motor		25.5T or 21.5T sensored brushless or 27-25t brushed
1	Electronic speed controller		Suitable to chosen motor
1	RC Transmitter and receiver
1	7.4v LiPo Shorty battery
1	Charger
1	Body		See downloads for alternatives
1	Front wing		See downloads for alternatives
1	Rear wing		See downloads for alternatives

• Put balls in their sockets. See to it that balls can move smoothly, see "binding balls" for help. If the ball still binds then you can use a ball screw ( Traxxas 1942 package comes with two) with a Dremel to enlarge it somewhat.
• Reaming of upper suspension mount: This can be done by using a M3 socket head screw and a dremel.

The EVO 4 Competition is based on experience of the EVO 3. So looking at the previous videos will probably be enough. If not contact me/us on Discord.

EVO 3 Sport assembly playlist on youtube
EVO 3 Framed rear suspension assembly
EVO 3 Competition front suspension assembly
EVO 3 Transverse battery mod assembly