Glad that old engines and techniques are still being preseved, across mthe world.
Seeing and hearing the start of the Ruston and Hornsby reminded me of the 9 inch bore Wilson at The WaterWorks Museum in Hereford, another single cylinder air start monster.
Have nevr managed ro find any data on it, so it may be the only one left that is runnable.
The father of a working colleague was a Fen Drainage Officer, and one evening he took us to see one of the big Rustons driving a scoopp wheel..
It wa redlined at 260 rpm. At that speed you could feel the engine house swaying in sympathy with the inertia forces.
(The big end cap required block and tackle to carry it when off, after removing the fout 7/8 BSF retaining bolts.
Heavy engineering!
Howard