Estate / Commercial
FJD Dynamics
RM21
375 lbs of commercial-grade autonomy. 25-inch deck. RTK + LiDAR fusion. Up to 27 acres in 72 hours. The most capable robotic mower on the market.
Interchangeable modules transform the RM21 from a mower into a complete grounds management system.
25" commercial deck with adjustable height from 0.8" to 5"
Autonomous collection for driving ranges and sports fields
Precision field striping for athletic fields and sports venues
Integrated collection for clean-cut finish on formal lawns
Remove morning dew for better turf health and playability
Assign zones, optimize routes, and monitor everything from your phone.
Divide your property into independent zones with custom schedules, cutting heights, and priorities. Manage multiple areas from a single dashboard.
Efficient path algorithms calculate optimal mowing patterns to minimize overlap and maximize battery life. Covers 3 acres per charge cycle.
Track real-time position, battery status, and mowing progress from anywhere. Set schedules, receive alerts, and review job history in the FJD app.
Reliable signal in challenging terrain. 360-degree safety. Fully autonomous docking and charging.
Dual navigation systems ensure centimeter-level accuracy even under tree canopy, near buildings, or in areas with weak satellite signal. No perimeter wire needed.
Full-surround obstacle detection with physical bumpers and emergency stop. Detects people, pets, and objects from all angles for safe autonomous operation.
Automatically returns to its charging station when battery is low. Fast charge in 3 hours or standard charge in 5 hours, then resumes mowing on schedule.
From tournament-ready turf to sprawling estate grounds, the RM21 delivers consistent results at scale.
| Performance | |
| Coverage per Charge | 3 acres |
| Max 72hr Coverage (Fast Charge) | 27 acres |
| Max 72hr Coverage (Standard) | 23 acres |
| Cutting Width | 25 in (635 mm) |
| Cutting Height | 20 – 127 mm (0.8 – 5 in) |
| Speed | 0 – 6 km/h |
| Max Slope | 20° |
| Power | |
| Battery | 4 kWh / 48V DC |
| Runtime | Up to 5 hours |
| Charge Time (Standard) | 5 hours |
| Charge Time (Fast) | 3 hours |
| Navigation & Safety | |
| Navigation | RTK + LiDAR Fusion |
| Boundary Setup | Virtual (no perimeter wire) |
| Obstacle Detection | 360° + Physical Bumpers |
| Emergency Stop | Yes |
| Build | |
| Weight | 375 lbs (170 kg) |
| IP Rating | IPX4 |
| Noise Level | <65 dB |
| Modules | |
| Available Modules | Mowing, Ball Picking, Line Marking, Grass Collecting, Dew Brushing |
| App & Connectivity | |
| App Control | FJD App (iOS / Android) |
| Remote Monitoring | Yes — real-time position, status, scheduling |
| Auto Docking | Yes |
| Warranty & Pricing | |
| Warranty | 2 years manufacturer |
| Price | $29,999 |
| Installation | From $999 |
The RM21 is not a residential mower scaled up. It is purpose-built for commercial and estate applications.
At 25 inches, the RM21 has the widest cutting deck of any autonomous mower. Fewer passes means faster coverage and less wear on your turf.
Five interchangeable modules make this more than a mower. Ball picking, line marking, grass collecting, and dew brushing are all available on one machine.
One RM21 can replace a full-time mowing crew. It operates autonomously 24/7, rain or shine, with no overtime, no breaks, and no callbacks.
Frequent, light cuts promote healthier grass. The RM21 can mow daily at under 65 dB, returning fine clippings as natural fertilizer.
Virtual boundaries mean no trenching, no buried wire, and no signal issues. Change your mowing zones in the app anytime.
Smart Lawn NY provides professional installation, training, seasonal maintenance, and warranty service right here in the Hudson Valley.
Schedule a free on-site assessment. We'll measure your property and recommend the right setup.
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