The next generation: RM21P “Rough Ranger”
RM21P is the successor to the RM21 — the same modular platform and the same batteries, with a floating front and a spring-loaded cutting deck for a more even cut. For new installations we recommend the RM21P. If you already own an RM21 we service and support it as before.
FJDynamics RM21 is more than a robotic lawn mower – it is an Autonomous Platform
FJDynamics RM21 Autonomous Robot Platform – RTK GPS & LiDAR for
Mowing, Ball Picking and Sports Fields
It can mow grass, collect balls, mark lines on football pitches, scrape dew or even be used in agriculture.
All thanks to a modular system where different implements are mounted on the same autonomous robot.
With RTK-GPS navigation and advanced sensors the RM21 can work completely independently with centimetre-level precision.
The result is a robot that can take care of large areas such as:
football pitches
golf courses
sports facilities
parks
agriculture
In other words: it does the job while you do something more fun.
The RM21 uses RTK GNSS navigation together with IMU sensors and an advanced autopilot.
This means the robot:
navigates without a boundary wire
works with ±2 cm precision
can plan efficient driving patterns
handles large open areas
The system maps the work area digitally and creates optimal work routes.
Benefits:
high capacity
even results
low operating cost
minimal staffing
The robot platform can also be remotely monitored via app or control system.
For business customers: lease from 189 SEK per day (5 750 SEK/month, 60-month leasing via Siemens Financial Services). A one-time startup fee for delivery, installation, mapping and training is added. Contact us for a quote.
Options and accessories
Add-ons that fit this product. Open one to see price and details.
| Max. mowing area 72 h with charging station | 90 000m² |
| Dimensions (L × W × H) | 1330 × 853 × 980 mm |
| Weight | 170 kg |
| Number of blades/discs | 1 rotor |
| Cutting height | 20-127 mm |
| Max. working area (per charge) | 12 000 m² |
| Battery capacity | 4 kWh |
| Speed | 0–6 km/h |
| Max. slope | 20° (25° dual rear wheels) |
| Standard charging time | 5 h |
| Fast charging | 2,5 h |
| Average mowing time | 3-5 h (4 kWh) |
| Certifications | CE / PSE |
| IP class | IPX4 |
| Heltar per Månad | 90 hectares |













