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Ripon is a fine place. I take it you are familiar with the 2' gauge by the canal.

Indeed, the mathematics of the dynamic response of an inertive engine are well understood. A science in itself. You may be interested in a demo of this : https://philbarber2.wordpress.com/2024/04/10/the-destabilising-effects-of-feedback/ As for regenerative braking,

The springs hold the valve open. The design is not failsafe.

The point is, that on any governor that is belt driven, the failure mode of the belt breaking is 'wrong side' since the throttle opens to full power.

... hmmm, never heard of a Porter governor, seems like a development of Watt's with an extra weight, which would further compound the failure mode! Any solely proportional feedback controller will have a negative speed vs load characteristic so will not be 'dead on accurate'. ... In...

Hi, I'm a retired engineer from Yorkshire. See also... philbarber2.wordpress.com