Rotary valve engine

[AStroudParticipant @astroud]

Hi all

Here is a clip of my rotary valve steam engine, inspired by the River Queen plans. I made several changes, not least to the rotary valve design as in my mind the published plans only allow partial opening during the cycle.

Andrew

https://youtu.be/gVItba_ImAM

[John HaineParticipant @johnhaine32865]

Partial opening during the cycle is probably preferred especially for high speed running as it admits a burst of steam into the cylinder which is then allowed to expand doing work.  Reduces steam consumption.  Engines often have variable cutoff valve gear to optimise efficiency over a wide range of speeds.

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