Reverend Dr Robert Stirling patented his now famous Stirling engine on 27th September 1816. To celebrate the bicentenary anniversary of the Stirling engine we have decided to make a number of special edition engines. With this engine we used copper plating to give our KS90 Ross yoke engine some 1800s semblance while retaining the performance. The combination of copper and brass really blend well together to provide an attractive display of contrasting metals.

It should be noted that although the copper has a wonderful appearance it will oxidise over time. We HIGHLY recommend you purchase a glass dome or case for these engines to protect them and naturally they can be polished.

Each kit comes with a pair of cotton gloves so you can handle and assemble the engine without leaving marks. If you ever need to clean or polish the copper plates we strongly suggest using brasso or Peek polish. Use a micro-fibre cloth to apply polish and use a clean part of the micro-fibre cloth to polish and remove excess.

This version of our hugely popular KS90 engine has a unique and fascinating new linkage arrangement. This new linkage is known as a Ross Yoke, named after Andy Ross, its inventor.

It allows both the piston and displacer to be connected on the same side end of the axle while at the same time maintaining the 90 degree offset between the piston and displacer. For larger engines it makes dramatically reduces the crank area. Ross yoke mechanism also often has stroke-multiplication meaning the crank-throw diameter can be shorter than the actual piston stroke.

The yoke itself is attached to the crank and pivots on two precision flanged ball bearings. The oval section at the bottom of the yoke pivots on one precision ball bearing. All other specifications on this engine are identical to our KS90 model.

Our kits are supplied in a custom foam insert which we have designed and made ourselves. This ensures that all the parts are safe and secure while in transit. It also doubles as an assembly aid, holding the engine still during assembly.

Instructions
Instructions for all our engines are available online in the form of a PDF. Click here if you would see the manuals now. All the instructions provide a detailed step by step process. Most instructions have over 50 high quality images showing the complete assembly process along with full parts list and detailed written instructions. Assembly should take no more than 30 minutes. All you need to supply is a small Pozidriv screwdriver (cross head) and small flat head screwdriver.

(Our engines are also available assembled)

(KS90 solar kit shown)

ENGINE FEATURES

• Stainless steel screws (except for pillar screws)
• Micron precision Borosilicate glass cylinder and Graphite power piston
• Low-profile heat insulated chamber pillars;
• Giving flat bottom and good surface contact with heat source
• Both connecting rods are positively located using low friction PEEK and stainless steel screws
• All airtight seals are made with high strength precision screw threads and nitrile O rings
• Ultra low friction demagnetised and de-greased bearings, NO lubrication required
• Fully CNC machined, giving crisp, clean and tidy edges all over
• Engine parts ultrasonically cleaned before hand assembly

MATERIALS

• Stainless steel connecting rods and ball-race bearings
• Micron precision Borosilicate glass cylinder
• Micron precision Graphite power piston
• Aluminium main pillar, hub and spokes
• Brass chamber pillars and flywheel rim
• Brass gland and cylinder holder

MAIN DIMENSIONS

• Base plates - 92mm diameter (3.62"), 2mm thick
• Displacer - 70mm diameter (2.75"), 7mm thick
• Flywheel - 82.5mm diameter(3.25"), 4mm thick
• Power piston - 9.5mm diameter (0.375")
• Overall height - 130mm (5.11")