Engines > From Plans

Unusual Corliss

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Caber:
So I think I understand how to do this. I made a cut away model of the valve and valve chest to see how it works and realise that the eccentrics need to be at 90 degrees to the crank and advance is controlled by the rotational position of the valve in the chest. In a full size engine the valve would act against the ports but here it acts against the steam chest aperture. In a proper Corlis the advance is fixed by the valve position and cut off by the trip mechanism that I may come back to on mine once it is running. The major issue is setting the exhaust valves as I don’t know what overlap I need to make the valve steam tight. Currently my geometry gives a rotation of about 35degrees which seems adequate to keep the valve open as wide as the port area for most of the stroke. Timing to get the opening close to bottom dead centre but steam  tight during the previous power stroke will be the challenge. As there wants to be marginal advance on the inlet and it is possible to take the inlet cover off when the engine is erected is a bit less of an issue😃

Admiral_dk:
Aha moment are always revealing  ;) and usually enjoyable too.

Per   :cheers:

Caber:
It’s finished! For now. I am contemplating a governor and trip gear but that needs a lot more design thinking as I have strayed so far from the MEM drawings!

I might also add handrails and lubricators like the prototype I have been following but for now it is done.

My workshop compressor is defunct so when that is sorted I will get it running and put up some video.

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