Small Revving Single-Cylinder Engine From Paper

The model is completely made of paper, it is reduced(and slightly modified) copy of this model: https://www.youtube.com/watch?v=kkSg02t4IDw&list=PLvVMj5_TSMBUA8QwBFIuf7Zz-U3NVK6xN LxWxH: 18 x 13 x 22 mm Shaft diameter: 0.5 mm Piston stroke: 3 mm Cylinder diameter: 3 mm "Swept volume": ~ 21 mm3