FREE UK SHIPPING ON ORDERS OVER £100
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NEXT WORKING DAY DISPATCH 48 HOUR UK DELIVERY
- Description
- Shipping and Refund
- INFORMATION
The Ross Yoke mechanism
The Kontax KS90R Low Temperature Stirling Engine features a unique and fascinating Ross linkage mechanism, which drives both the piston and displacer disc from the same end of the central axle with a cam-driven triangular yoke. The yoke pivots on two precision ball-race bearings, and the oval aperture at the bottom of the yoke pivots on one precision ball-race bearing. The engine also features anodised aluminium chamber plates, super-lightweight flywheel spokes and a solid brass rim, all styled in an elegant and efficient manner. The engine is designed in a gamma configuration, with the power cylinder connected directly to the main chamber and both the piston and displacer disc operating in parallel to each other.
Eco-friendly
This KS90R engine is the ultimate eco-friendly device, showing with one spin of the flywheel a clean and simple way of converting waste heat into motion. Because these engines rely on a temperature difference for operation, they will run on almost any heat source. Typical heat sources include hot coffee or tea, warm sunlight, TV digibox and the human hand. As long as one plate is 5°c to 10°c warmer than the other the engine will run. It doesn't matter which plate is warm, as long as the other is cooler. If you warm the bottom plate the engine will run clockwise, if you reverse the temperature differential and warm the top plate the engine will run anti-clockwise.
How does it work?
Stirling engines work by cyclically heating and cooling the air inside the main chamber. As the air heats up it expands, and as it cools down it contracts. This expansion and contraction drives a small piston which in turn drives the flywheel. The clever thing about Stirling engines is that the mechanism for cycling the heating and cooling of the air is built into the engine in the form of the displacer, which is driven by the flywheel and crank arrangement and moves the air from the warm side to the cool side and back again over and over.
The Stirling engine is named after its inventor, Rev. Robert Stirling, who patented his idea in 1816.
Heat Sources
The engine can run on strong direct sunlight. The top surface will be the hot side and the bottom the cool side and the engine will run anti-clockwise.
The engine can run on hand heat. If you have a warm hand in a cool room the engine will run from the heat of your hand.
Placing the engine on top of a freshly made cup tea or coffee (NOT BOILING) will provide enough energy for it to run at a relatively high speed for up to 30 minutes.
Placing the engine over a bowl of ice will provide enough temperature difference for operation. Similar to solar operation the top surface will be the hot side and the bottom the cool side, and the engine will run anti-clockwise. You can also place a dish of ice on the top plate for clockwise operation.
Main features:
Ross linkage mechanism (named after its inventor, Andy Ross)
Will run on a 5°c to 10°c temperature difference
Extremely low friction self-lubricating graphite piston
Built in flywheel balancing
Dimensions calculated for optimum performance
Main chamber pillars thermally isolated with nylon screws
Regenerating displacer disc
Materials
Stainless steel connecting rods and ball-race bearings
PEEK connecting rod bushes
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
Aluminium plates
Dimensions
Plates - 92mm diameter, 3mm thick (3.62" x 0.19")
Displacer - 70mm diameter, 7mm thick (2.75" x 0.27")
Flywheel - 82.5mm diameter, 4mm thick (3.25" x 0.16")
Power piston - 9.5mm diameter (0.375")
Overall height - 130mm (5.11")
Assembled or Kit
The engine is available fully assembled and ready to go or as a self-assembly kit.
PLEASE CONTACT US IF YOU WISH TO ORDER
SHIPPING INFORMATION FOR UK BUYERS
Shipments to UK buyers are sent by either Parcelforce or Royal Mail on a 48 hour tracked service.
Postage costs to UK addresses are determined by basket total.
UK SHIPPING COSTS
Orders under £10.00 | £1.99 postage |
Orders between £10.01 and £100.00 | £3.99 postage |
Orders over £100.00 | FREE UK DELIVERY |
Orders are dispatched by the next working day and will not be dispatched on public bank holidays, advertised closure times and over weekends.
RESTRICTED PRODUCTS
Products containing Hexamine (notably, Mamod Waxed Fuel Tablets and Wilesco WiTabs) are now regulated in the United Kingdom and therefore no longer available for purchase by the general public without the correct licence in place. For this reason, both products are available for collection from store only and, at point of collection, can only be supplied to buyers who can produce a valid EPP Licence.
SHIPPING INFORMATION FOR INTERNATIONAL BUYERS
We are currently accepting orders from UK, the EU and a range of countries worldwide. Whilst we ship to many countries, we may not ship to your country. If we are unable to ship to your country, you will be unable to checkout.
RESTRICTIONS
We are unable to supply solid fuel tablets to buyers from overseas.
EU and International shipping costs are determined by order weight and will be sent by the Royal Mail Standard International service. For further information about shipping times for different destinations, please visit the Royal Mail website.
EU (Plus Norway & Switzerland) SHIPPING COSTS
Orders under 250g | £9.50 GBP |
Orders between 250g and 2kg | £14.50 GBP |
Orders between 2kg and 5kg | £23.50 GBP |
Over 5kg | Please contact us directly to arrange shipping |
WORLDWIDE (Ex. Australia & New Zealand) SHIPPING COSTS
Orders under 250g | £10.95 GBP |
Orders between 250g and 2kg | £29.50 GBP |
Orders between 2kg and 5kg | £47.50 GBP |
Over 5kg | Please contact us directly to arrange shipping |
AUSTRALIA & NEW ZEALAND SHIPPING COSTS
Orders under 250g | £11.95 GBP |
Orders between 250g and 2kg | £32.95 GBP |
Orders between 2kg and 5kg | £47.50 GBP |
Over 5kg | Please contact us directly to arrange shipping |
Orders to buyers outside of the UK will not be charged UK VAT however will be required to pay taxes and duties payable upon import to the destination country. You will be contacted by the shipping company with details about how to do this, if required.
Dispatch of international orders may take slightly longer than our usual 1 working day aim to dispatch due to customs requirements.
Details of our refund and returns policy can be found on our website here.
We are a UK-based stockist and distributor for Wilesco, Jensen, Mamod and more!
This product is a detailed model or associated spare part for adult collectors. Not suitable for children under 14 years.