I think the era of steam comes to an end. At most in obsolete nuclear power plants will be still used.
Half supports the engine has one very big advantage. Piston not friction on the walls of the "cylinder""Only the seals frictions cylinder
Thanks to these properties, the engine may be running on ... the coal dust.
Rudolf Diesel's first engine was built just on the coal dust, but unfortunately zacierał is at work. In the case of half rotate, will not look any login problems.Simply does not have any large surface friction
Only the directory should be chosen for personal seal. Each round you can straighten lines, of course, resistant to coal dust.....