“Feels absolutely amazing … very realistic, especially the jumps.”
Bruno Blumbergs — rallycross driver · SimRacing Expo, Dortmund 2025
6DOF racing simulator The rig moves like
the car does.
Four-post sim racing motion rigs put linear actuators under the chassis corners. Lifting corners approximates roll and pitch and nothing else. Built on the Portal Development Kit (PDK), the PDK Ecosystem is a 6DOF racing simulator development kit for developers, integrators and research partners, on a Stewart platform: six direct-drive legs moving the whole cockpit through all six degrees of freedom at once.
Development Kit: early-access hardware, software in active development.
What each axis gives you ›Your sims, your gear ›The long stint ›
<1 ms
game to motion — from the wheel, too
3 g
on all six axes, fully loaded (250 kg)
629 Hz
vibration, measured with up to 250 kg on board · up to 2,000 Hz per motor
“It felt stable … there was a lot more verticality than I thought there would be.”
Jake Rupert — SuperLap driver · Sim Gaming Expo, Schaumburg 2025
Quotes cut from the captioned films on See it move; each rider consented, none was paid.
What each axis gives you
Six axes, six different things to feel.
A four-actuator rig can give you two of these convincingly. The other four are the ones that tell you what the car is actually doing.
| Axis | Kind | What it tells you |
|---|---|---|
| Surge | Translation | Longitudinal load under braking and throttle. Brake markers become something you feel arrive rather than something you watch. |
| Sway | Translation | Lateral slip and traction loss. Oversteer reaches your body before it reaches the screen — the difference between catching a slide and watching it. |
| Heave | Translation | Curb strikes, surface texture, and vertical compression through high-load corners. |
| Pitch | Rotation | Dive and squat, taken from telemetry rather than approximated from corner lift. |
| Roll | Rotation | Body roll, banking and camber transitions, with the smooth authority of direct drive. |
| Yaw | Rotation | Rear-end breakaway as a real rotation of the cockpit. The cue corner-lift rigs do not have at all. |
Per-axis travel is published on the technology page and summarized on /industries/ and /compare/, as the single-axis envelope — no axis reaches its single-axis maximum while the others are working.
Stroke and speed
More stroke still has
to come back to center.
Spec sheets compare stroke. What you feel in the seat is how fast the rig answers the car, and whether you notice it washing out. Bigger rigs are slow, and they drag you back to center. Measured: under 1 ms game telemetry to motion, with both measurement points on the latency page. What a rider feels is not something ARK can guarantee.
More travel or faster motion ›Why bigger rigs drag you back ›
Your sims, your gear
It takes a pose over UDP.
Getting a pose out of a racing title is what FlyPT Mover, third-party software, does; which titles it handles is up to FlyPT Mover.
Titles
Through FlyPT Mover, third-party software, with titles such as iRacing, Assetto Corsa Competizione and rFactor 2. Which titles work, and how, depends on FlyPT Mover and each game, not on ARK.
Wheel and pedals
Bringing your own wheelbase and pedals? The PDK Racer chassis takes Fanatec and Simucube wheelbases and pedals.
Tuning
Runs in a browser dashboard served from the platform's own onboard router. Nothing to install, reachable on your network.
FlyPT Mover is third-party software, written and maintained by FlyPT Mover; it is not ARK software. How integration works ›
The long stint
The motors never carry
the weight of the rig.
A servo platform holds the full static load of rig and driver on its motors for the whole session. Heat builds, and on many rigs fidelity fades with it. On the PDK the standing load is carried by pneumatic cylinders under patent CA 3217174 C, so the motors work only when the car is moving you
The PDK + ARK Ecosystem
Wheel, pedals and chassis,
matched to the platform.
The PDK, the aluminum racing chassis, extension feet and the two-piece wood table, an ARK direct-drive wheelbase, wheel, load-cell pedals and button box, in one development kit. Support, cancellation and import terms are in the Development Kit Evaluation Agreement. We make the forces. Every part is tested to take them. You add the seat, PC and screen.
$8,499.99
USD development-kit price · €8,699.99 in the EU
The development-kit price for your country, and what it includes, is on the order page.
Order a development kitAll four builds ›
Built to allocation · ready to ship an estimated 3–6 months from order confirmation; delays of up to 12 months are possible
We build development kits in sequence for qualified recipients.
Keep reading
Backlash
The specific defect that separates a rig that feels connected from one that feels approximate.
Motion cueing
How kilometers of road are mapped into a platform with a finite envelope.
See it move
Drivers and first-time riders on the PDK at the shows, unscripted and captioned.