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Reply to "Scale PRR S2 Turbine"

PRRronbh posted:
Allegheny48 posted:

I remember reading a full length article on the turbine in Classic Trains a few years back and the engine's exhaust alternately exited out of each of the 4 stacks in some sort of rotation.  Since the engine was not of the reciprocating type which tends to create a forced exhaust the turbine did not and I would guess that the exhaust tended to flow back along the boiler top and into the cab.  Therefore the attempts to create an updraft to lift the smoke a bit higher.  One of the NYC's L4 Mohawks sported a cowl similar to what is shown on the turbine in the middle picture.  I'd love to trade places with the young boy in the last photo. 

Actually to maintain the needed draft to the firebox at various speeds three butterfly valves were designed/installed into three of the four exhaust outlet ports.  And as speed increased the butterfly valves would sequence open.

Ron

For those of you that may be interested in reading the Classic Trains article mentioned in my earlier post the issue is Spring 2012 pages 20 thru 31.  The author, Preston Cook, includes a comparison to C&O's M-1 turbine and EMD's E7's.  Some interesting reading in my opinion.

 

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