RM21 Multi-Functional Robotic Mower
All-in-One Solution for a New Era of Grass Care.
RM21 at a glance
Manufacturer: FJ Dynamics
Product: RM21 Multi-Functional Robotic Mower
UK supplier & support: Grass Robotics, the professional robotic mowing division of LiDAR Tech UK Ltd
Best suited to: golf courses, sports grounds, estates and large maintained areas
Navigation: RTK + LiDAR
How to buy: demonstration, site assessment and quotation available
Compare the FJ Dynamics mower range, explore solutions for golf courses, sports pitches and estates & large grounds, or book a UK demonstration.
Order your RM21 online
FJD RM21 professional robotic mower for commercial and large-residential grounds.
Prices include VAT, with the ex-VAT amount also shown. Free UK delivery. UK orders only.
Robot Mowing for Cricket: FJD RM21 at Charlbury Cricket Club
We chat with Archie at Charlbury Cricket Club about the FJD RM21 and robotic mowing for cricket outfields.
Considering a robotic mower for your club? Discuss your ground and arrange a demonstration with Grass Robotics UK.
RM21 Mower Options
RM21 Robotic Mower
BP01 Ball Picker Kit
LM01 Line Marker Kit
GC01 Grass Collector Kit
DB01 Dew Brush Kit
Product Showcase
Explore real-world case studies from around the globe, demonstrating how the RM21 solution is used in practice.
Kris Misiaczynski
Black Water Links Golf Course
What Green Keepers Say About the RM21 Lawn Mower?
“I think robot at the golf course is a game changer for our profession.”
LM01 Line Marker Kit
Accurate, autonomous line marking
Pitch maintenance is not only about mowing. It is also about delivering clear, consistent line marking within limited time windows and changing conditions.
BP01 Ball Picker Kit
Automate your Driving Range
At a golf driving range, RM21 autonomously collects balls and returns to the unloading point when full, reducing labour and saving time.
Smart Control, Hassle-Free Performance
Intelligent Path Planning
Plan optimal routes automatically within a defined work area, ensuring your turf is perfectly maintained.
Multi-Zone Management
Run a single task across multiple zones — ideal for large golf courses and sports fields.
Remote App Monitoring
Monitor status, create maps, and manage schedules on your phone anytime, anywhere.
Full-Time Safety, Worry-Free Operation
No Signal Worries
RTK + LiDAR fusion ensures reliable performance even under trees or in signal-challenging areas.
Multi-Layer Safety Protection
Combine real-time 360° LiDAR obstacle detection with front and rear physical bumpers, ensuring safer autonomous operation.
Smart Docking & Charging
Automatically returns to charge when the battery is low
— no more range anxiety.
Application Scenarios
Specifications
| 72-hour max mowing area (fast charging mode) | 108,000㎡ (26.7 acres) |
| 72-hour max mowing area (standard charging mode) | 93,600㎡ (23.1 acres) |
| Max mowing area per charge | 12,000㎡ / 3 acres |
| Max climbing ability | 20° |
| Recommended working slope | 15° |
| Travel speed | 0–6 km/h / 0–3.7 mph |
| Weight | 170 kg / 375 lb |
| Dimensions | 1330×853×980 mm / 52.4×33.6×38.6 in. |
| IP rating | IPX4 |
| Operating temperature | 0–45℃ |
| Cutting Height | 20–127 mm / 0.8–5 in. |
| Cutting Width | 635 mm / 25 in.n. |
| Battery capacity | 4 kWh |
| Maximum Working Time | 5 Hours |
| Charging Time (Standard) | 5 Hours |
| Charging Time (Fast Charging) | 3 Hours |
| Battery Rated Voltage | 48 V DC |
| Flat Blade | Standard |
| Discharge Blade | Standard |
| Charging Station | Standard |
Request Demo
We have an RM21 available for demo in the UK. Why not drop us a line to request a demo?
RM21 accessories & packages
Choose attachments, positioning equipment or a complete RM21 package. Prices include VAT, with the ex-VAT amount also shown. Free UK delivery.
RM21 attachments
Attachments are sold separately from the RM21 mower. Application images show each attachment fitted to a mower.
LM01 Line Marking Kit
GC01 Grass Collector
BP01 Ball Picker
DB01 Dew Brush Kit
Positioning & mapping
Contact Grass Robotics for advice on the appropriate positioning and mapping configuration for your site.
RS1 RTK Base Station + Tripod
CORS Station — 5 NTRIP Accounts
FJD Trion P2
Complete RM21 packages
Each package includes the RM21 mower and the listed equipment. LM01 is the line-marking kit; GC01 is the grass collector.
RM21 + LM01 + RTK Station
RM21 + LM01
RM21 + GC01
RM21 + LM01 + GC01
RM21 + CORS Station
Order your RM21 online
FJD RM21 professional robotic mower for commercial and large-residential grounds.
Prices include VAT, with the ex-VAT amount also shown. Free UK delivery. UK orders only.