3D Printed RS850
The RS850 is an innovative, lightweight 3D-printed RC yacht with a unique twin-mast rig, rapid acceleration and beautifully balanced, agile sailing.
RS850 Materials RS850 Build Guide
Key design features:
- 850mm Hull Length, 2.24Kg Sailing Weight
- Revolutionary Twin Mast Rig
- Lead-shot filled printed bulb @ 950g
- Printed Keel & Rudder, NACA aerofoil
- Print Volume: 200 x 200 x 200mm (xyz)
- Educational licence available for classroom use
- STLs: $26 USD Instant digital download
Revolutionary Twin Mast Rig
The RS850 is an innovative rig design that is powerful, simple and light weight. This concept is unique in modern model RC yachts and proves to be an excellent design.
The two masts are independant stayless rigs that have static goosenecks. The sail cut is designed so the carbon spars provide the forces normally created with heavy metal fittings. We have drastically simplified this with a simple but clever design.
The advantages of this rig system are:
- Less drag, no side stays, back stays or jib topping lift lines.
- Lighter weight than standard rigging
- Sails lower down which helps with aerodynamics and less heel angle
- Very simple to make yourself
- Printed battens and fittings, keeps overall costs down
- Powerful jib/main slot, evenly spaced all the way up the mast
Innovation Meets Hands-On Learning
EXPLORE. ENGINEER. BUILD. SAIL.The Racing Sparrow RS850 brings innovation into the classroom with its unique twin-mast design and lightweight construction. Students can explore aerodynamics, balance, stability and engineering while building a high-performance radio controlled sailboat.
Designed for easy 3D printing and straightforward assembly, the RS850 offers an engaging STEM project with comprehensive online build instructions and educational licensing available.
Responsive Stern Hung Rudder
The one piece printed rudder is a NACA accurate aerofoil shape and is an integral part to the success of the design of the RS850.
The servo control rod connects to the arm. There is an internal 3mm structural rod. The rudder is fixed in place with a 4mm carbon rod which is super simple to build and is very accurate and wobble free.
The open stern arrangement conceals the workings of the rudder and mainsheet and keeps the water out. We think it looks super cool too!
It's a solid dependable design which helps the boat track perfectly upwind and makes the boat very agile and easy to tack. You don't need the servo's full throw. We found only 75% of the servo throw is needed for the best sailing experience.
3D Printed Parts & Materials
The RS850 is designed for easy, stress-free 3D printing and assembly. The hull prints in five sections, with a choice of solid or soft bow. Many internal braces and fittings are integrated into the prints, simplifying construction.
All parts fit a 200 × 200 × 200mm printer, with larger cabin and rudder options for bigger printers. An editable STEP file for the servo tray is also included.
The comprehensive online build guide includes step-by-step photos, sail plans and detailed instructions.
Fast and Fun to Sail
This boat has proven to be very fast. The innovative twin rig produces a tonne of power. The long keel allowed us to reduce the total weight of the boat down to just 2.24Kg. This is almost half the weight of an IOM. The power to weight ratio results in a yacht with exceptional acceleration up and down wind.
It is the fastest boat in the Racing Sparrow fleet and we are proud of her perfomance and agility.
