Maximum Deck Space. Unmatched Stability. Tactical Utility.
The Roto-Tech Kontra R400 Open Deck configuration is a heavy-duty, 4-metre workhorse built for missions that demand maximum cargo capacity, clear work decks, and rapid deployment capabilities. By utilizing a traditional tiller-steered outboard configuration, this layout eliminates a fixed steering console, freeing up the entire internal cockpit area.
Constructed from virtually indestructible polyethylene (LDPE), the R400 Open Deck features a cathedral hull type architecture that acts a little like a catamaran, providing an incredibly stable, flat, and spacious working platform. It is the premier choice for professional diving teams, flood evacuation units, marine and rescue teams who need to transport responders, casualties and bulky equipment without restriction.
Optimized for Tactical, High-Capacity Operations
The Open Deck configuration is specifically engineered for environments where space, accessibility, and simplicity are critical to mission success.
- Diving & Salvage Operations: Without a central console blocking the deck, divers have ample room to kitting up, manage air cylinders, and move around safely. The low freeboard combined with the boat's exceptional lateral stability makes rolling off the side or pulling fully geared divers back over the gunwales safe and effortless.
- Rapid Flood Evacuation: During emergency flood deployments, every square inch of deck space matters. The open layout accommodates stretcher placement, large supply crates, and allows for the safe evacuation of up to 6 people in close-quarters inland environments.
- Shallow Water Versatility: The combination of a shallow draft, an open layout, and a rugged polyethylene hull allows this craft to slide over submerged rocks, concrete barriers, and hidden debris. Responders can step seamlessly off the open bow directly onto riverbanks or flooded streets.
Key Operational Advantages
- Unobstructed 360° Work Space: The open cockpit design allows personnel to move from bow to stern without obstruction, creating a highly efficient workspace for deploying nets, booms, search equipment, or dive gear.
- Catamaran-Style Lateral Stability: The specialized double-hull shape ensures the vessel remains level even when heavy loads or multiple crew members shift to one side. This minimizes rolling and provides a rock-solid platform for technical water work.
- Zero-Maintenance LDPE Hull: Built to withstand brutal commercial use, the hull resists extreme impacts, chemical spills, and UV degradation. It has less requirement for anti-fouling, needs no painting, and can be stored outdoors or dragged across gravel beaches.
- Smart Storage Integration: Removable or integrated seating double as heavy-duty storage lockers, keeping ropes, anchors, and emergency medical kits secure and dry while leaving the main deck completely clear.
Technical Specifications
| Parameter | Specifications |
|---|---|
| Design Category | PRS Category C / D |
| Total Length (LOA) | 4.00 m |
| Total Width / Beam | 1.60 m |
| Total Height | 0.79 m |
| Empty Unit Weight | 130 kg (base hull weight) |
| Maximum Load Capacity | 450 kg (Cat C) / 600 kg (Cat D) |
| Passenger Capacity | 4 Persons (Cat C) / 6 Persons (Cat D) |
| Max Engine Power | 40hp (Long Column / L-Shaft Tiller Outboard) |
Standard & Custom Equipment Packages
Specialist Small Craft out-fits the R400 Open Deck to be completely mission-ready upon delivery.
Our standard professional utility layouts include:
- Tiller Command Setup: Optimized transom design for long-shaft tiller outboards, allowing a full range of tiller movement without restriction.
- Heavy-Duty Crew Safety: Robust stainless steel side guardrails, optional non-slip flat flooring and perimeter life lines for maximum safety in rough water.
- Flexible Seating & Storage: Removable side bench lockers that can be adjusted or completely removed to alter the deck layout based on the day's mission.
- Commercial Hardware: Heavy-duty bow and stern mooring cleats, reinforced towing eyes, and optional dedicated mounting for searchlights or specialized equipment.
Recommended Tiller Control Outboards
With the Open Deck configuration, for normal use, we highly recommend pairing with a 20-25hp Tiller Handle outboard. Rated to 40hp, there is scope for fitment of 30-40hp outboards for maximum performance with the heaviest load.
Why Source Through Specialist Small Craft?
As the sole UK distributor for Roto-Tech marine craft, Specialist Small Craft Ltd draws on over 35 years of commercial marine experience. We specialize in building custom, turnkey commercial packages—matching the right hull, tiller outboard, and specialized launching trailer to your exact operational requirements
Please call us for more information, to view or to get a quote.
More information can be found at our dedicated Roto-Tech website: https://www.boatsandfloats.co.uk/