On another maritime forum:
Well Merlyn, I see Half Rotate being adapted for marine use. long shafts with propellers at the end must be attached to each wheel with the weight.
This type of engine does not become popular quickly, because no one has shown its good technology .. I show possible technology, because it is possible, because the "cylinder" and the piston are relatively separated by the distance, and in a small sonic it can be 1 mm , but even larger, even 5 millimeters. and such a row may be imperfections of the "cylinder" .. Besides, the "cylinder" will not wear out, so nothing threatens a bolted joint with a double head, similar to classic solutions .. Probably now you will look at it with a more kind eye .. Of course it can They can be steam or diesel versions, as well as Newcomen waste heat recovery, which will also recover all heat from the exhaust gas cooling from the conventional engine.
I think this is the next small step in developing this structure ..
Andrew