I did some messing around with it today.
At 90 degree phasing, I couldn’t get it to reliably self start due to the slip eccentrics moving after stopping. So I returned it to 180 degrees.
I then proceeded to quickly plumb in the air valves. I was quickly able to test between simple, compound, and HP cylinder only mode. The simple twin mode definitely produces the most power but I believe it is steam thirsty. It was almost turbo mode. So compound acts like economy mode and sustains the run.
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