Hello, I am from Ukraine, I am 64. I would like to present to your attention my first engine. It has a volume of 0.2 cc and a cylinder diameter of 6 mm, stroke 7 mm, weight 23 grams. For its manufacture, only small homemade lathe was used. The structure was drawn in SolidWorks. The engine has a hardened steel sleeve and cast-iron piston, the crankshaft is also hardened and ground. The piston and cylinder are ground in and the cylinder has a cone of the working surface of about 3 microns. The engine starts easily on standart fuel and develops up to 14000 rpm with Cox 4x2.5 prop. A total of 4 such engines were manufactered. I have developed many different engines rating from 0.1 to 0.8 cc, the next type is in the process of preparation. Their peculiarity is the machined crankcase due to the lack of casting possibilities. Here are a few photos of the engine, accessories and, as well a shot video of the first test run.