Twin blades for big lawns.
Twin blades for big lawns.
Special A 70 cm twin-blade cut at 0.8 m/s: the big-lawn machine.
Weakness Needs a 1.1 m gap, leaves the widest uncut edge, and loses corners on small lawns.
Gen 3 · Speedster · Concept. Simulated.
A 1 m wide robot with two 36 cm blades side by side: a 70 cm cut, nearly twice Ion's, at up to 0.8 m/s. Two big drive wheels and two casters. It's for large open lawns, where the time to cover the area matters more than reaching every corner. The width is the price: it needs a 1.1 m gap, and the uncut band along fences is wider.
Tachyon is a concept: simulated, not built. Parts and prices are estimates, in US dollars (Nov 2026). Drawings are generated from the profile the simulator uses.
| Body (L × W × H) | 95 × 100 × 40 cm |
|---|---|
| Mass | ≈ 38 kg |
| Drive | Two-wheel differential, 2 casters, 32 cm wheels, up to 0.8 m/s |
| Blades | 36 cm + 36 cm → 70 cm cut |
| Battery | 10S 15 Ah ≈ 540 Wh |
| Stripe spacing | 63.0 cm (10% overlap) |
| Edge lap | 55 cm from the edge; uncut band ≈ 20 cm for the trimmer |
| Turning in place sweeps | a 189 cm circle |
| 3D lidar blind zone | 71 cm ahead of the nose |
| Margin at raised beds | 70 cm |
| Best for | Open lawns from ~1,000 to 3,000 m². |
| Slopes | up to ≈ 15° |
| Part | What it does | Price | Source |
|---|---|---|---|
| Aluminium extrusion frame + panels | Chassis and blade guard | ≈ $200 | estimate |
| 2 × hub or geared BLDC drive motors | Drive | ≈ $150–250 | estimate |
| 2 × ODrive S1 motor controllers | Drive | $298 | ODrive shop |
| 2 × BLDC blade motors + VESC-class controllers with braking | Cutting | ≈ $300 | estimate |
| 2 × swivel casters | Support | ≈ $40 | estimate |
| 10S Li-ion pack with BMS (~540 Wh) | Power | ≈ $350 | estimate |
| Raspberry Pi 5 8 GB + SSD + cooler | The brain | ≈ $215–245 | Raspberry Pi list price |
| simpleRTK2B GNSS + antenna | Centimetre positioning | ≈ $235 | ArduSimple |
| BNO085 IMU | Heading and tilt | $30 | Adafruit |
| Livox Mid-360 3D lidar | Seeing obstacles | $979 | list price |
| Pico 2 + safety parts (two blade channels) | The hardware blade interlock | ≈ $120 | estimate |
| Total | ≈ $2,917–3,047 | ||
mowlark