Author Topic: Marcher twin cylinder marine steam  (Read 566 times)

Offline Team ricky

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Marcher twin cylinder marine steam
« on: May 09, 2024, 06:00:24 PM »
Hi Chaps,

Iím new here and wanted to share a nice build log of two lots of twin cylinder marcher engines :)

Offline Admiral_dk

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Re: Marcher twin cylinder marine steam
« Reply #1 on: May 09, 2024, 09:34:58 PM »
Don't think that I've seen this design before - but happy to see more  :)

Oh .... and welcome.

Per     :cheers:

Offline Team ricky

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Re: Marcher twin cylinder marine steam
« Reply #2 on: May 13, 2024, 08:54:01 PM »
So Iím planning on building one as a piston valve engine and one as slide valve  ;)


Should be interesting to try both out , I have just looked through the drawings and the piston valve version is a bit sketchy, When I get into it Iíll post some pictures !

Offline Team ricky

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Re: Marcher twin cylinder marine steam
« Reply #3 on: May 14, 2024, 12:38:57 PM »
So as far as I can see on the drawing there are two options within the piston valve configuration,

This makes for interesting building when you donít know this in advance!

This picture details how you are not going to build the cylinders and piston 😂


Offline Team ricky

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Re: Marcher twin cylinder marine steam
« Reply #4 on: May 14, 2024, 12:44:44 PM »
This picture shows how it is to be built, however not very detailed for the piston valve itself as it needed a re-designÖ.

The right side of the cylinder chest is to be cut off entirely, then the steam will come into the top of the cylinder via a banjo bolt, Problem is as drawn in the first picture the piston valve wonít work as there is no steam exit provided for in the lower half of the cylinder-piston arrangement.

I have made the cylinder chest as per second drawing, Then made the piston valve from ground SS stock and modified to allow steam to pass through the centre of the valve to the top to allow for a steam exhaust.

Offline Michael S.

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Re: Marcher twin cylinder marine steam
« Reply #5 on: May 14, 2024, 01:32:34 PM »
Hello,
I don't know, but I can't see any fault with the piston valve in the first picture. I think both directions of rotation of the motor will be possible. It works with external and internal inflow with steam. With the lower variant, the overall length of the motor is shorter, which is an advantage when used in model boats.

Michael

Offline Team ricky

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Re: Marcher twin cylinder marine steam
« Reply #6 on: May 15, 2024, 08:58:17 PM »
A bit more done today :)

I have made both identical piston valves with the hole down the centre to allow steam from the lower port to exit or feed as needed!  The last process is to drill a cross hole 1.5mm below the lower port positionÖ

I also made a nicely fitting piston from phosphorus bronze with graphite yarn for the ringÖ.

Offline Zephyrin

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Re: Marcher twin cylinder marine steam
« Reply #7 on: May 16, 2024, 09:36:47 AM »
but I don't see the problem you raise with the valve !

The only point I dislike with such a design is the lack of lap for the valve, required for the reversal of the rotation by inverting exhaust and steam intake, common in model engines but not very realistic, contrary to the slide valve version of this engine !

« Last Edit: May 17, 2024, 10:49:21 PM by Zephyrin »

Offline Team ricky

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Re: Marcher twin cylinder marine steam
« Reply #8 on: May 16, 2024, 08:40:38 PM »
Hi,

Yes I see I didnít quite catch all of the drawing!

The picture of the valve shown is good for making a part but isnít suitable for the valve chests in the revised piston valve assembly, there is a picture of the correct valve but no dimms, and missing the cross hole ! Itís pictured inside the valve body and not separately to make it obvious there is a difference!?

Also made two piston rods and a cross head ;)

The standards probably should be properly de-burred after the slots were cut as there are some small high spots inside, caught me out and I made the first one under sizeÖ

Iíll probably re-mount in the lathe, clock in, and very lightly skim with a boring bar Ö..

Offline Roger B

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Re: Marcher twin cylinder marine steam
« Reply #9 on: May 17, 2024, 08:23:07 AM »
Excellent work  :praise2: That's not an engine I have seen before. Is it a US design?
Best regards

Roger

Offline Michael S.

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Re: Marcher twin cylinder marine steam
« Reply #10 on: May 17, 2024, 06:58:50 PM »
Hello Roger,

I believe the castings for the steam engine can be purchased from Reeves.
I also wanted to build a small engine like this for a second steamboat. With a valve for reversing.
But then I found a German blueprint and then built this engine.
(At some point I'll change the many pipes. I think I can reduce that.)

Michael

 

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