The HMA150, as published
Four actuators under the chassis corners: pitch, roll and heave. 21-bit encoders. 1 g and 300 mm/s at 250 kg, as announced. $2,999, released 28 July 2026, with MOZA's own motion manager.
Compare · MOZA
One shared spec.
Different kinematics.
The MOZA HMA150 and the PDK overlap on intent — high-precision sim racing motion — and on one notable specification, the 21-bit encoder. The kinematics underneath are a different arrangement entirely, and that is where the comparison actually lives.
Side by side
Where they meet and where they part.
| MOZA HMA150 | ARK PDK | |
|---|---|---|
| Architecture | Four-post arrangement | 6-DOF Stewart-Gough, six legs in parallel |
| Axes | 3-DOF: pitch, roll, heave | Six: surge, sway, heave, roll, pitch, yaw |
| Encoder | 21-bit | 21-bit absolute, 2,097,152 positions per revolution |
| Controller | 600 MHz processor, integrated 48 V | 2 × ARM Cortex-M7 at 600 MHz · three dual-axis ArkDrive controllers · 53.3 V bus |
| Control rates | Not stated by the maker | 8 kHz drive loop per motor · 3.3 kHz inverse kinematics · 1 kHz position commands — all internal |
| Performance | 1 g and 300 mm/s at 250 kg; 0.45 g and 150 mm/s at 350 kg, as announced | 3 g peak, firmware safety limit, at any payload up to 250 kg |
| Software | First-party motion manager, game-agnostic | No first-party motion manager. Six-axis pose over UDP, so FlyPT Mover, SimHub or your own code drives it — none of them ours, none of them locked out |
| Price | $2,999, released 28 July 2026 | $4,899.99 PDK — the like-for-like · $6,299.99 PDK Racer · $8,499.99 PDK + ARK Ecosystem, with wheelbase, wheel, load-cell pedals and button box |
Figures in the other column are read from the manufacturer's published material, with source and retrieval date. Manufacturers revise specifications — if one here is out of date, tell us and it gets corrected. On the acceleration row: ours is 3 g peak, software-limited, describing a brief onset rather than a sustained load.
Sources: MOZA Racing — MOZA HMA150 Motion System (4 Actuators), us.mozaracing.com, retrieved 2026-09-13; MOZA Racing — MOZA Racing Debuts AI Coach and Motion Innovations at GDC 2026, mozaracing.com, retrieved 2026-09-13; MOZA Racing — MOZA Launches HMA150 Motion System (28 July 2026), mozaracing.com, retrieved 2026-09-13.
The real difference
Four posts give you three axes.
Six legs give you six.
A four-post arrangement raises and lowers corners. That produces pitch, roll and heave convincingly, and it cannot produce surge, sway or yaw at all — not less well, but not at all. Whether that matters depends entirely on what you are doing: for many racing applications three axes well executed is a good machine. For flight, for vestibular work, or for anything where the rear stepping out needs to arrive as rotation, the missing three are the whole point.
Side by side, in plain terms
The PDK + ARK Ecosystem
$8,499.99: the platform, the aluminium racing chassis, extension feet and table, and our direct-drive wheelbase, wheel, load-cell pedals and button box, matched and tuned as one system. Six axes — surge, sway and yaw as well — at 3 g peak, any payload up to 250 kg. You add the seat, PC and screen.
Made to order · Batch One: ready to ship an estimated 3–6 months from order confirmation
What the other three axes carry
Surge under braking and throttle, sway as the rear steps out, yaw as the car rotates. A four-post rig raises and lowers corners, so those three are not in its kinematics. Both machines read 21-bit encoders; what differs is what sits between the encoder and the load.
Keep reading
What datasheets leave out
The method behind this page, applied to us before anyone else.
NLR Motion Platform V3
A seat that tilts on two axes, against a platform that moves the whole cockpit on six.
Sim racing
What each of the six axes actually gives you in a car.
Every build starts with this platform. The PDK + ARK Ecosystem finishes it — racing chassis, wheelbase, wheel, load-cell pedals and button box, $8,499.99.
Order the PDK + ARK EcosystemAll four builds ›
Made to order · Batch One: ready to ship an estimated 3–6 months from order confirmation