Skip to Content

FJDynamics RM21 – Robotic Lawn Mower 93,600 m²

  • RTK-GPS without a boundary wire – centimetre precision for golf, football and parks
  • Fully autonomous 24/7 operation – mows large areas efficiently and systematically
  • Modular – can be fitted with a mower, ball picker, line marker and more
  • Built for tough conditions – handles slopes, uneven terrain and the Nordic climate

Size your robot fleet and compare the cost in RoboKalkylen


FJD Protection insurance (Arctic/Protector)
  • Max. mowing area 72 h with charging station
  • Dimensions (L × W × H)
  • Weight
  • Number of blades/discs
  • Cutting height
  • Max. working area (per charge)
  • Battery capacity
  • Speed
  • Max. slope
  • Standard charging time
  • Fast charging
  • Average mowing time
  • Certifications
  • IP class
  • Heltar per Månad

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.

See the RM21P →

FJDynamics RM21 is more than a robotic lawn mower – it is an Autonomous Platform

What is the RM21?


At RoboService we like to say that the FJDynamics RM21 is not a robotic lawn mower – it is a robot platform.

FJD RM21 on a golf course with autonomous mowing
RM21 rough mower in operation on a grass surface

"Best cutting result I've seen a robot do"

Magnus Eliasson at Albatross Golf is very satisfied
Magnus Eliasson
Albatros Golf Club

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
Failed to save your selection. Please try again.