Search found 153 matches

by baggo
Tue Jun 15, 2021 4:00 pm
Forum: Live Steam
Topic: Slide valve
Replies: 44
Views: 1662

Re: Slide valve

Ok, still trying to be helpful hopefully :D Tom has given the dimensions for the ports, the slide valve and the valve travel and we've filled in the missing dimensions? We've deduced that the lap is 0.125" and the 0.5" valve travel should match the travel required in full gear. The size of the exhau...
by baggo
Sat May 29, 2021 7:36 pm
Forum: Live Steam
Topic: Stephenson valve system
Replies: 21
Views: 1098

Re: Stephenson valve system

If the dimensions you give on your drawing are correct (and I'm interpreting them correctly) then the lap of the valves is 1/8". The valve travel to fully open the ports will be: 2 x (lap + port width) = 2 x (1/8 + 1/8) = 1/2" so your 1/2" travel of the valve rod is fine and both ports should open f...
by baggo
Fri Jan 15, 2021 6:23 pm
Forum: Live Steam
Topic: 1/2'' scale drawings
Replies: 21
Views: 9029

Re: 1/2'' scale drawings

I would be interested in knowing what design that is if anyone recognises it.

John
by baggo
Fri Jan 15, 2021 6:19 am
Forum: Live Steam
Topic: Tubes...leaking
Replies: 76
Views: 19325

Re: Tubes...leaking

I've successfully cured small weeps from tubes and stays with Loctite 290 which is a thin wicking grade of threadlocker. Just put some on the leaking area after drying and cleaning and let it soak in. It helps if you can pull a vacuum inside the boiler to help draw the Loctite into the crack. We had...
by baggo
Sun Dec 27, 2020 8:40 pm
Forum: Live Steam
Topic: Highline Videos
Replies: 29
Views: 9782

Re: Highline Videos

John, I think 2 - 1/2” gauge is a terrific size. Easily moved about, can be displayed in your living room and yet will pull a decent load with ease! I just wish the clubs here in the Northeast United States had 2 - 1/2” gauge rails. Keith Taylor, Maine USA Yes, 2½" has to be my favourate gauge, esp...
by baggo
Sun Dec 27, 2020 6:07 am
Forum: Live Steam
Topic: Highline Videos
Replies: 29
Views: 9782

Re: Highline Videos

A couple more 2½" Gauge videos:

https://youtu.be/dTGVK8lxoB4



https://youtu.be/0Yds7LQFbtQ



5" Gauge Polly rally (for Polly Models Locos) at my local club:

https://youtu.be/BHZ_IbFTQwI



John
by baggo
Sat Dec 26, 2020 9:20 pm
Forum: Live Steam
Topic: Highline Videos
Replies: 29
Views: 9782

Re: Highline Videos

Does anyone recognise the gentleman with the hat at 25:37? I'm interested as he has a 2½" Gauge Helen Long :D

John
by baggo
Thu Dec 24, 2020 1:07 pm
Forum: Live Steam
Topic: Highline Videos
Replies: 29
Views: 9782

Re: Highline Videos

Some 2½" Gauge action from the UK:

Black Five and Ayesha:

https://youtu.be/x4DpM-2oZok



Ayesha again:

https://youtu.be/G5D-HAXE32M



John
by baggo
Mon Dec 07, 2020 3:17 pm
Forum: Live Steam
Topic: Is it typical to later find steam passages need to be bored bigger?
Replies: 8
Views: 2190

Re: Is it typical to later find steam passages need to be bored bigger?

It's interesting that although LBSC was indeed a big advocate of large ports and steam passages, those on his 2½" Gauge Ayesha are quite small in comparison to those in his later 2½" gauge designs and Ayesha still runs very well. Ayesha Ports 1.jpg I can't remember exactly but the passages are only ...
by baggo
Mon Dec 07, 2020 2:56 pm
Forum: Live Steam
Topic: At what point is a boiler big enough to be steel instead of copper?
Replies: 25
Views: 7204

Re: At what point is a boiler big enough to be steel instead of copper?

Reeves have recently sold off all their boiler forming plates and their boiler 'kits' only have the flat sheet and tubes now so I presume they can no longer supply flanged plates.

John
by baggo
Wed Dec 02, 2020 5:47 am
Forum: Live Steam
Topic: tube spacing
Replies: 15
Views: 5082

Re: tube spacing

I wouldn't get too hung up on the Keiller ratio for the size of tubes used in our small gauge boilers. Keiller did base his calculations on the tubes in full size locos where the conditions in the tubes are different to those in small diameter ones. In small diameter tubes the gas flow is mostly lam...
by baggo
Mon Jul 27, 2020 6:42 pm
Forum: Live Steam
Topic: Elderly steam engine. Anyone recognize it?
Replies: 12
Views: 5176

Re: Elderly steam engine. Anyone recognize it?

Molly has the valves underneath the cylinders whereas this has the valves vertically between them. If you look carefully, what looks like one valve rod in the centre of the valvechest is actually two half round rods side by side, one for each of the valves. It's not a design that I am familiar with....