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1
Your Own Design / Re: Another Adventure in Hot Air
« Last post by PaulR on Today at 02:57:26 pm »
I disconnected everything and gave it a spin, it's very free-running...

<a href="https://www.youtube.com/watch?v=hK2AJQyxdRU" target="_blank">http://www.youtube.com/watch?v=hK2AJQyxdRU</a>

Meanwhile, the water jacket developed another leak so I disassembled to investigate. When I put it back together I found that there was no longer any bounce back when everything was connected up.  :Mad: I'm going to put this on the shelf and do something else for a week or two!
2
Your Own Design / Re: Another Adventure in Hot Air
« Last post by Minh Thanh on Today at 11:08:55 am »
Quote from: PaulR on October 10, 2026, 10:05:26 am
I just reassembled with the new lighter displacer and we have some bounce back.


I don't think I'm getting anything like 10 revolutions when spinning the disconnected flywheel by hand, probably in the region of four or five. I think that will improve if I run it in further using the rotary tool to spin it - it takes ages to wind down when I take the tool away and has improved over time.


  If you do not connect the flywheel to the displacer and power piston, Then that number of rotations is too low.,  this indicates excessive friction between the shaft and bearings, or a mechanical bind somewhere.

  This My engine has an aluminum flywheel—with a steel flywheel, it spins for much longer.

<a href="https://www.youtube.com/watch?v=NmKHmshNYJI" target="_blank">http://www.youtube.com/watch?v=NmKHmshNYJI</a>
3
From Kits/Castings / Re: Southworth rotative pump
« Last post by Charles Lamont on Today at 09:07:47 am »
Restricting the ball lift also prevents the ball from hammering the seat. K N Harris says ball lift should be restricted to 1/6 of ball diameter and "The White steam car, which had pumps driven at engine speed, had 5/8 in. diameter bronze ball valves, and these were restricted to a lift of only 1/32 in. Anything more resulted in rapid deterioration of the balls and their seats and a lot of objectionable noise." He goes on to say they were working at uncommonly high speed and pressure.
4
Introduce Yourself / Re: Hello from Pensford, Somerset
« Last post by Ralph F on Today at 08:53:07 am »
Many thanks Andy

I have dropped the Bristol boys a line. They are the wrong side of bristol for me, but Shepton is quite a distance, but probably a nice drive :)
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Introduce Yourself / Re: Hello from Pensford, Somerset
« Last post by Spinner21 on Today at 08:46:45 am »
A follow up to my earlier message, there is also the East Somerset society based at Shepton Mallet which maybe a little closer to you
Andy
6
Introduce Yourself / Re: Hello from Dorset!
« Last post by Chipswitheverything on Today at 08:35:55 am »
Hi Andrew, welcome to the forum from a modeller in Hampshire.  Just had a look at your excellent website, very nicely done.  Am interested in what you have done by way of the attractive drawn and painted header illustrations, are they done by yourself? ;  and I'm wondering if they are on paper, or created by digital technique ?  Dave
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Introduce Yourself / Re: Hello from Pensford, Somerset
« Last post by Spinner21 on Today at 08:35:11 am »
Hi Ralph, in your original post you asked about Model Engineering clubs, there is the Bristol Society of Model Engineers, I believe there may also be a club in the Taunton area.
Andy
8
From Plans / Re: Liney RV-2 Rescue
« Last post by Admiral_dk on Today at 06:42:23 am »
Great result - looks good and runs great  :praise2:

Per          :cheers:
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From Kits/Castings / Re: PM Research #3
« Last post by Sanjay F on Today at 01:43:50 am »
Looking very nice, making good progress  :popcorn: :ThumbsUp:
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From Kits/Castings / Re: Southworth rotative pump
« Last post by Sanjay F on Today at 01:41:10 am »
Quote from: crueby on Today at 12:33:05 am
They keep the check balls from moving so far that they block the passage on the other side. You want one ball at a time seated - to allow the fluid to flow in just one direction. Without the pin, the ball behind it would move too far, and block the passage where the fluid coming from that hole would go into.
Thanks Chris - I like to know how things work rather than just make them without understanding; that makes perfect sense  :) :ThumbsUp:
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