If there is an engine that is easy to construct at home, then it has to be the Stirling engine. If you manage to build it nicely, it will be able to do some 3000 RPM which is the highest attainable speed for this type of homebuilt engine.Here's how to make a Stirling engine at home.The chief material for building a nice Stirling engine is scrap and especially the metal part of it.Apart from the scrap, you will need the following straight pins, washer, PVC balloon, balloon, red bull tins, coke, coat hanger, silicon gasket and high temperature glue.Go ahead andcome up with all the listed materials before you start off on the main exercise of building the Stirling engine through the following steps. The first step is to make a ring stand using the coke tin and it should be hallowed already for this task. Once you have hallowed it, cut it up into some two equal halves. One of the two halves preferably the lower one should then be cut open with the help of a base ring so that it can be transformed into a three legged ring. The can's side should then be cut out to end up with a ring stand.
The next step involves coming up with the pressure level of the engine. In order to do this successfully, you'll have to take another can of coke and scrape its sides well before cutting the top most part off. The bottom part of the pressure vessel will be composed of this cut can. A level of accuracy needs to be observed when it comes to constructing the upper part as opposed to the lower part. You will need another can of coke and then cut it 2 inches from the bottom accurately. Take a pin and pierce a hole at the center of the bottom part. After this, at the center of the pressure vessel, fix a small rectangular steel plate with some glue plus the bolt to prevent leakages. The displacer is the next unit to be made using similar steps as above but with a red bull can which is then fitted into the pressure vessel that was made previously.
The coat hanger will be used to make the crankshaft of your Stirling engine. The crankshaft support will come from the red bull cans that come with support holes. After this, have the crankshaft properly fitted in into the material that was intended to support it and then turn it to see whether it turns well within them. Once you are ready to undertake this, fix the crankshaft including its support professionally into the pressure vessel. Take the balloon and cut it up into the shape of a disc and then use it in place of a diaphragm. The task of the diaphragm is to connect the crank and the disc. To have it running, heat up the lower part of the pressure vessel for 30 or so seconds and then gently push the fly wheel of the engine and you will have it rotating. You've just learnt how to build a Stirling engine.
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This article touched the basics of the topic. I have 2 more resources related to the above. They are how to make a stirling engine at home and how to build a stirling engine . Do consider reading them.
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