Author Topic: 30ft 1890's navy steam launch 1/6th scale  (Read 31092 times)

Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #345 on: December 08, 2021, 12:21:41 AM »
duplex....
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Offline Dan Rowe

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #346 on: December 08, 2021, 12:36:50 AM »
Yes very nice... what is the bore and stroke and did you make the castings or what is the source of the castings...... :cartwheel: :cartwheel: :cartwheel: and how big is it?

Sometimes a picture needs a few words.

Cheers Dan
ShaylocoDan

Offline cnr6400

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #347 on: December 08, 2021, 12:40:56 AM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:

That is one gorgeous pump! You and Slim should be proud of that one!  :cheers:

Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #348 on: December 08, 2021, 01:06:41 AM »
the photo is the real one,, hoping mine looks half that good,, for the basic design a set of cole's duplex pump plans was reduced by 1/3.. steam bores are 1/2" pumps bores are 5/16ths..
« Last Edit: December 08, 2021, 01:38:08 AM by tghs »
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Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #349 on: December 08, 2021, 01:42:08 PM »
a little catch-up as there was a time gap in the work, 1/6th scale US navy Worthington duplex steam pump for boiler make-up, the pump end on non-navy pumps are like the Cole's plan with intake and exhaust valves in a complex(but worked well) arrangement above the cylinders.. the Navy "sailor proofed" the pump with a simple arrangement of intakes below the cylinders and exhaust above, they added individual valve cover design for easy service.. the mounting in the boats was vertical.. ala Crueby, no castings are being used, kind of in the range of watch making to get the scale close to correct, these were small units in real life..
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Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #350 on: January 07, 2022, 06:03:15 PM »
working on the pump valve type today.. started with the cone type, but thought about a seated ball for better seating and sealing.. with use off a 1/8" ball end mill it was simple to make and looks like it should work well.. 7 more plus a few spares to make.. I have several material type of balls to test..
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Offline Dan Rowe

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #351 on: January 07, 2022, 06:31:47 PM »
I really like this design. I would have used a cone shaped seat even with a ball valve because it is easier to make a lap for a cone seat for future maintenance. I have lapped a few of these types of valves on merchant ships.

Cheers Dan
ShaylocoDan

Offline crueby

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #352 on: January 07, 2022, 06:41:52 PM »
Great looking parts, will be interesting to see which valve types work best.   :popcorn: :popcorn: :popcorn:

Offline Dan Rowe

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #353 on: January 07, 2022, 08:21:22 PM »
I was looking for drawings of the Navy version of a Worthington duplex pump and did not find anything, but here is a link to the early history of the pump:
https://cdn.asme.org/wwwasmeorg/media/resourcefiles/aboutasme/who%20we%20are/engineering%20history/landmarks/final-mariners-asme-brochure-red.pdf

Cheers Dan
ShaylocoDan

Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #354 on: January 09, 2022, 01:59:12 PM »
the navy small boat worthingtons were rare little things, the design sacrificed the proven but complex pump for a simple unit that could be cleaned or serviced with few tools and in place (sailor proof). the biggest problem was the lack of use as these boats spent may have spent months in the cradles not in operation and then maybe a few days of work before another stowed period. My full scale steam contact who has worked on several of these does some "modern" mods to improve the operation.. modern O-rings added to valve faces in one
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Online Roger B

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #355 on: January 09, 2022, 04:31:43 PM »
This is quite an interesting piece on ball valves:

https://www.precisionballs.com/ball_valve.php

I have one of their ball laps for the delivery valves on my fuel injection pumps. It seems to do the job  :)
Best regards

Roger

Offline Dan Rowe

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #356 on: January 09, 2022, 05:31:36 PM »
Roger, thanks for the good link on ball valves and laps, very interesting and useful.

Cheers Dan
ShaylocoDan

Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #357 on: January 09, 2022, 06:35:30 PM »
lots of great info, seeing that the pump block is brass, thinking I can turn a guided ball tool from steel and lapp in some seats to help the balls seat better..
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Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #358 on: February 25, 2022, 07:27:31 PM »
spent some time on the lathe today and produced parts that wouldn't even fill a thimble!  turned a tool to lap the valve seats for hopefully better seating and less wear. slims starting to wonder when all these parts are going to get put together..
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Offline tghs

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Re: 30ft 1890's navy steam launch 1/6th scale
« Reply #359 on: March 19, 2022, 03:57:17 PM »
hope to be back at this shortly,, the RAF boat in down to small details and paint.. looking again at my engine and thinking that the thrust box could be made functional,, thinking that a flat plate fixture to hold the halves with the center open so the disc recesses could be milled out with a keyway cutter in the mill?  any other ideas..
what the @#&% over