Mystery steam engine

[chris123]

Looking at the photo - post #65 - it appears that the crank pins are in-line, so the pistons move together. The valves must therefore be configured so the when the bottom of the HP cylinder is open and exhausting, the LP cylinder must have the top cylinder port opened as the intake to receive the HP exhaust. And vice-versa.
Thus there is no way the pistons can move when at TDC or BDC unless carried-over by inertia from a flywheel.
I suggest the flanges on the ends of the crankshaft will have a flywheel on one end, and a coupling to the propeller shaft on the other end. The flywheel is likely to be a solid cylinder, with the diameter about the same as 2 x the radius to the outer end on the big-end side bars, and the length of the flywheel equal to the diameter. That's what I have used on Marine single engines. And although a Compound Twin, this engine acts dynamically as a single cylinder engine.
K2

 

[chris123]

Hi steamchick
The pistons move not in the same motion
I just got a pic for you

 

[chris123]

The condenser just condenses the exhaust steam.
The old engines from the 1840's, such as ship engines, used the vacuum created in the condenser to improve efficiency (perhaps all condensers improve efficiency).
You can reclaim the condensate (water) from the condenser and reuse it in the boiler, assuming you can get rid of the oil.
Oil in a boiler can make it foam, which is not a good thing.
In industrial areas with little access to large amounts of boiler feed water, condensers were a must.
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Yes that realy make sense
And the eccentric would have driven
Such a pump
Isnt it?
Chris

 

[chris123]

I have seen some modern steam engines cast with very complex cores; the german guy, I forget his name, made his own design and had a foundry cast it in gray iron. It took two attempts by a professional foundry to get a complete fill.

Making the cores for one piston valve and one D-valve would not really be any different if they were located between the cylinders, or at the outsides of the cylinders. It would probably be easier to support the cores if they were located on the ends of the cylinders.

As far as machining, using a D-valve between the cylinders could make for some tricky machining, since you would have to reach in.
Like a 20hp Stanley steam auto engine, with two D-valves between the cylinders; you have to reach in to machine the valve faces.

Long castings can be tricky to fill, and you have to make sure one end does not solidify first and draw molten metal from the other end.

It is an impressive cylinder casting, in my opinion, and impressive machining too.
.

Edit:
The german guy is Rainer Radow.
Here is a link to his website, and a few photos from that website.
All image copyrights by Rainer Radow.

https://radow.org/dampfmaschine-kaiserliche-marine.php

https://steamboating.de/kaiser/dampfmaschine-kaiserliche-marine-03-09.php

https://steamboating.de/kaiser/dampfmaschine-kaiserliche-marine-03-10.php

https://steamboating.de/kaiser/dampfmaschine-kaiserliche-marine-03-11.php


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Hi green twin
Now this is realy a complicated cast
Super difficult
Chris

 

[chris123]

Hi green twin
Now this is realy a complicated cast
Super difficult
Chris

Hi green twin
On the drawings that u sendet through
I saw that in the middle section is meant to be a slider
Bud my one is empty
Look
The brass u see is the seal on the bottom of the cast
Regards chris