marine steam engines and boilers

Dave Stevens (Lumberyard)

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I'm really enjoying this thread, and the great drawings!

thanks rob
here are a some links first two are a topic here about the US steam navy and the engine of the Cairo

the other two links are other forums with this same topic. I have 3 topics on different forums because each one has different members and different discussions going on.







 

Dave Stevens (Lumberyard)

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the next part to be modeled is this

Sht. 35. Side Pipes With Valves. Mar. 31, 1840..jpg

lets break down the drawing into smaller sections so we can see and read the details

35A.jpg35B.jpg35C.jpg35D.jpg35E.jpg35F.jpg35G.jpg35H.jpg35J.jpg35K.jpg35L.jpg35M.jpg
 

Dave Stevens (Lumberyard)

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from another topic in another forum I also have on this engine


I found these diagrams while searching for images of Cornish engine valves. The poppet valves used on the engine that you are doing could have been similar to these even though your engine probably did not operate on the Cornish cycle. They call them double beat valves which I would call balanced valves. You should do more searching on Cornish pumping engines as there are still quite a few left in England. The 1812 engine at Crofton had Cornish valve gear installed in 1843.
https://commons.wikimedia.org/wiki/F...lves,_1866.jpg
https://navsbooks.wordpress.com/2016...lor-and-woolf/
https://commons.wikimedia.org/wiki/F...ine,_1904).jpg


Ok, on the elevation of the valve chest there is an upper and lower clamp right in the middle, in the top view they have two 2-3/4" diameter holes. On the right side you have two lifters with 2-3/4" diameter holes. Looks like there are two lifter shafts with these mounted on them. I've got to get my head around the distance from the center of the lift shafts to the center of the valves and see if the lifters are the right length... one is shorter. The legend mentions cut-off. There is some other mechanism in play, the rock shaft lifts a toe on the vertical shaft, the arms attach to that and lift the valve, but what is the cut-off device? Sickel's? I need to dig some. - JM

---------- Post added at 12:35:14 PM ---------- Previous post was at 12:21:49 PM ----------

Possibly:
http://americanhistory.si.edu/collec...ct/nmah_847097
 

Dave Stevens (Lumberyard)

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I tried to transcribe the instructions on the drawing and this is what I came up with

so even when you have the drawing right in front of you
you still have to figure out what the designer is talking about


Side pipe chest to be each as drawn, the ???? th?? To be changed to opposite sides of the chest respectively, then another chesty to be ??? The pattern is then to be altered by changing the bonnet C from the upper to the lower side of the chest as shown by the red lines D,D the stuffing boxes at the top of the chests to be added as shown by the red lines E,E then two more chests to be eas?? ??? one with the cores as drawn and one with the cores changed to the cores the opposite sides respectively the valves and seats ????? marked G and the boxes and caps for lifting rods to be of composition and also the bushings to guides at I,I the connecting pieces to be of cast iron, the valves seats to be ground to their place and held down by the four top bolts the stuffing boxes for side pipes are not to be boxed , ??? the glands to be boxed and turned

Sheet no. 33 drawings with side pipes and valves and cut off pipe complete hangers for rod shafts lifters for valves shaft P block for cut off motion
 

Dave Stevens (Lumberyard)

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there is just about no interest in marine steam engines here on this forum or the 3d modeling of one so all the step by step modeling and model engineering is being done on another forum.
however here are some results of the work being done

as work proceeds the engine is rendered in different colors to separate the different stages of design work.

as5E.JPGas5A.JPGas5G.JPGe421.JPGe421a.JPGe421b.JPGe421c.JPGe421d.JPGe421e.JPGeal1.JPGeal2.JPGeal3.JPGeal4.JPG
 
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Moxis

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Hello Dave. At least I am very interested about your work. I have been waiting for a new update for a long time. Could you inform in which forum you are issuing your work so that I could go there and follow your postings.
I am asking this because I am just starting a new project, where my intention is to build a working side lever engine to power the paddle wheels of the model.
In fact you might be also interested about my blog where I have built a working two cylinder marine steam engine: https://shipsofscale.com/sosforums/threads/lempi-a-steam-powered-half-open-launch-built-in-1877-in-warkaus-finland.3126/
 
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Rob Wood

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there is just about no interest in marine steam engines here on this forum or the 3d modeling of one so all the step by step modeling and model engineering is being done on another forum.
however here are some results of the work being done

as work proceeds the engine is rendered in different colors to separate the different stages of design work.

Stunning work! Will this be a working steam engine?
 

Rob Wood

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Hello Dave. At least I am very interested about your work. I have been waiting for a new update for a long time. Could you inform in which forum you are issuing your work so that I could go there and follow your postings.
I am asking this because I am just starting a new project, where my intention is to build a working side lever engine to power the paddle wheels of the model.
Same here: Which forum has the most discussion?
 

Dave Stevens (Lumberyard)

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oh my I did not realize anyone had an interest in the engine above is a link to the public forum however you may have to join the forum to see the larger images. also there is a lot of information between the people involved in the above engine going on in a private discussion. So if you want to join in the team working on this engine go to the link.
 

Dave Stevens (Lumberyard)

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what I am building is a hollow dummy engine which will be used in a diorama of the building of the steam frigate Mississippi. This will be in 3/8 scale and will result in a hull 7 feet long. At this scale every nut and bolt will be included in the engine and the boilers.

now there is an interest in taking the work being done in the design work and there is talk of castings for a working model. This step is a bit above what I am doing and falls into model engineering category.
People interested in model engineering and steam power check out the other forum.
 

Dave Stevens (Lumberyard)

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one great thing about this forum and other like minded forums they will link up and exchange information. some forums are very picky about posting links to other forums and topics. Lucky for us you can consider SOS forum a gateway to a massive amount of information world wide.
 

Dave Stevens (Lumberyard)

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great video!

I was actually thinking about 3D printing this engine in a clear resin then running it on compressed air and pumping smoke through the engine to simulate steam and show how the engine would actually work.

The Mississippi had two of these engines side by side so then I thought of a X section of the engine room under construction with one engine almost complete and the other being built my a team of little people with parts scattered all around the diorama.
 

donfarr

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Dave again magnificent, THE 3-D work is just amazing, your knowledge also and your ability to find and absorb things is amazing, are you planing a kit or is this for a muesem. Don PS X SECTION that i am talking about
 
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