I came across the orphaned engine standard of a Cheddar Pintail or Pelican engine (the standard is identical for both engines, only the cylinders are of different diameter, 9 and 11mm). Somebody disassembled it for painting and later the cylinders got lost.
Pintail and Pelican, like all oscillating engines from Cheddar, were sturdy and reliable. And since the standard was basically as new, I decided to rebuild it into an engine.
After some consideration, I decided to rebuild it as a Pintail, because of the smaller working volume of 2 cc, as opposed to 4 cc in case of the Pintail. Half the working volume equates to half the quantity of steam consumed at a given rpm, meaning a smaller boiler can be used or, with the same boiler, enjoy a longer running time. In my opinion, a 2 cc engine can easily drive a boat up to 70-80 cm length and, if the hull is of slender shape, even up to 100 cm. So a Pintail seems the more useful engine to have unless one has quite a large model steam boat.
This is what I have to work with. The dark red paint is quite nice, but it is unfortunately chipped in several places.