The Hit and miss engine shown below has such silicone O ring used for a piston ring. George, I'm well aware of the silicone O-Rings which are used to make piston rings. On this M29 the combination of to big a clearance and to many oil groves are the reason why so much air steam is leaking between piston and Cylinder. The rather large piston Cylinder clearance prevents piston seizure but the trade off is a big leakage. Aiding a second one on top just kills it. The longer and throe going a piston is the better is the resulting seal.Īs it usually goes, one problem would not be that bad. Each time you aid a oil grove you basically reduce the seal. The small clearance between piston and cylinder is what makes a seal which is in this case not a given. Looking at the given design i think Microcosm did not find the right balance. Designing a Cylinder and piston you have 2 parameters that can be used to keep a good seal and preventing a piston seizure. I think aiding 3 oil groves is a total overkill defeats the purpose. By aiding 3 Oil groves that are each time 0.7mm wide they removed nearly 50% of the piston surface. They have to be completely filled with oil to work and that is not for sure always a given.Ĭompared to a combustion engine steam engines have usually a rather short piston. The reason for tat is that they do work just conditional. I will not go to much in details otherwise it will get to confusing again.įirst off I'm not a big believer when it comes to the Oil Groves in the piston. Looking at car engines you always find the Aluminum piston and Steel cast cylinder combination and there are good reasons for that. In case of a cylinder and piston it would be wise to have one of the two made with a material that is slightly harder this will greatly prevent a piston seizure. However it is not as simple as many think. If i produce new pistons i might use a clearance of 20microns. Keeping that in mind i claim that the tolerance we see is way to big half of the tolerance would be fine. The tolerance will remain as measured even if engine is getting hot. Since piston as well as cylinder are made of brass we would not see various heat expansions. Doing the math this is 50 Microns clearance or 2 mills. The piston measured 12.96mm and the cylinder measured 13.01mm. This morning i removed one of the Cylinders to measure the clearance between piston and Cylinder. Wilesco construction kits give almost every age group the opportunity to build technical systems themselves, regardless how skilled they are. The longevity of Wilesco steam engines also fuels the ambitions and passions of collectors. The principle of energy conversion, however, remains the same.Īll machines have the GS sign (means prooved security) or type-tested seal of approval, awarded and monitored by TÜV Nord, an independent testing lab.įor more than 60 years of production of over three million different steam engine models ensure unbeatable enjoyment. These days, steam power plants use turbines instead of piston-driven machines. Wilesco steam engine models follow a long line of tradition, more topical than ever! Heat is converted into mechanical energy and is thus made into usable power. This powered individual machines via transmissions. If energy can be obtained from “water and fire”, energy which can run power drills, saws, trip hammers and organs, Wilesco steam engines are just the visual aid to learn from and play with.Īt the start of the 19th century, whole factories were kitted out with a central steam engine. He continuously perfected his steam engine model and is considered to be the man who discovered the potential of harnessing steam expansion. The Scottish inventor, James Watt (1736-1819), improved past inventions and registered his design as a patent in 1769. In the second half of the 18th century, a new era was set in motion, the dawn of industrialisation. The question “Steam engines - what’s that?” was a question already raised in the classic black and white German film “Feuerzangenbowle” (“The Punch Bowl”), which was set in the late 19th century. Wilesco Steam Engines – Explore fascinating technology
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