Morgans schreef:

You might do well to consider a 2 stroke supercharged diesel engine. You
make one of those, and make it scaleable by adding more banks of cylinders,
and the flying world will beat a path to your doorstep.

Hm. The flying world did not exactly beat any kind of path to the
doorstep of www.dair.co.uk, though they did exactly that. Wilksh company
wasn't far off, either, with equal lack of big success.