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Nano Flux Thermo-acoustic Twin Cylinder Engine

Nano Flux Thermo-acoustic Twin Cylinder Engine

5.0
2 reviews
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SKU NANO-FLU-TWIN
£79.17
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was £87.50 Save 10%
A twin cylinder Thermo-acoustic engine with an anodised aluminium frame and a blisteringly fast top speed.
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Robin H.
London,
United Kingdom
Fri 7 Feb 2025
This is an impressive piece of precision engineering and it is a pleasure to assemble it from kit. Assembly instructions are clear and do not require any specialised knowledge or techniques. There are two things to note about this engine. Firstly, it is very sensitive to draughts and any movement of the flames causes the engine to stop, but it can be restarted in a few moments when the flame is stable again. Secondly, the glass tubes do get a small patch of lampblack on them at the point of contact with the flame. This can be removed by gentle rubbing with a small piece of damp Brillo pad.
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Nano Flux Thermo-acoustic Twin Cylinder Engine
Product Details

Thermo-acoustic Twin Cylinder Engine

The Kontax Nano Flux Thermo-acoustic Twin Cylinder engine has an anodised aluminium construction with delicately styled brass fittings. It features twin cylinders running in a parallel configuration, self-lubricating graphite pistons running in borosilicate glass cylinders and stainless steel regenerator stacks. Unlike Stirling engines, this thermo-acoustic engine has no displacer and can therefore run in either direction. It runs on two tiny candle-sized flames with the top speed a blistering 3300 rpm.

How does it work?

Thermoacoustic engines are known by several names, including resonant engine, lag engine and lamina flow engine. Conventional Stirling engines have a power piston and a second device usually called a displacer that shuttles air between the hot and cold parts of the engine. Thermoacoustic engines don’t use a displacer to shuttle the air around, but rely on a standing wave to do the work of a displacer. Inside the engine at the hot end there is dense slug of stainless steel wool known as a stack, which is heated by the flame. At the other end of the glass tube, by the brass fins, is a barrier with a tiny hole through it, known as the choke. The standing wave resonates between the stack and the choke. In operation, a packet of air is compressed by flywheel and piston motion which heats it slightly. The packet of air is pushed into the end of the hot stack where it absorbs heat from the stack and main tube walls, which causes an overall expansion within the system and drives the piston outward. Piston motion outwards decompresses the packet of air and and it moves out of the hot stack which causes an overall cooling and decompression within the system which does more work on the piston, pulling it in.

Main features:

  • Twin configuration
  • Stainless steel regenerator stacks
  • Top speed of 3300rpm
  • Runs on a tiny methylated spirits or denatured alcohol flame
  • Extremely low friction self-lubricating graphite pistons
  • Built in flywheel balancing

Materials

  • Aluminium connecting rods
  • Stainless steel ball-race bearings
  • Micron precision borosilicate glass cylinders
  • Micron precision graphite power pistons
  • Aluminium base, foot, and brackets
  • Aluminium flywheel spokes
  • Brass flywheel rim

Dimensions

  • Base - 115mm x 50mm x 5mm thick (4.5" x 1.9" x 0.2")
  • Flywheel - 35mm diameter x 6mm thick (1.4" x 0.23")
  • Power piston - 9.5mm diameter (0.375")
  • Overall height - 70mm (2.76")
  • Burner - 25mm diameter x 40mm high (1" x 1.6")

Assembled

The engine is available fully assembled and ready to go or as a self-assembly kit.

Instructions

Click the image below for PDF assembly, operation and maintenance instructions for this engine.

Nano Flux Twin instructions


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