Here you get all information about the care and maintenance of your Böhm Stirling engines.

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Speed and operation

The rotational speed depends on the length of the wick and the vertical and horizontal distance from the heating cylinder. The wick should protrude adequately: 4-5 mm is good and it should be pressed widely (bushy). The models require a proper flame, then you can reduce the speed and experiment with it.

The engine runs faster at the beginning and then slows down because the temperature difference is smaller and ergo the power.

The engine must be operated with new ethyl alcohol (94%). (English name: denaturated alcohol, methylated alcohol, the percentage must be at least 94% or higher.

Check the laws and rules for open fires which are binding.

Never leave ethyl alcohol bottles open. Close after filling and remove far from the demonstration area. Keep out of reach of children!!! ONLY FOR USE BY ADULTS!

When using other flammable liquids such as e.g. The use of lamp oil/paraffin oil/candles voids the warranty.

Tea lights are not suitable in any case! They soot the engine. Likewise the required temperature is not achieved meaning that the model can not run!

Never replace the pistons or displacement axles in multi-cylinder models.

Each cylinder has its own is measured piston and displacement axle (is a coordinated team).

Scores can form in brass cylinders. This is normal for a friction bearing.

As already described, clean the piston and cylinder with a dry cloth. This is very important, because the abrasion dust must be removed, otherwise the model will run more and more poorly until it stops!

The sound level of individual models may vary considerably, especially with flame lickers, ringing, whistling, squealing are normal and no cause for a complaint.