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Another Solo (But Not For UNCLE & No Bobbing Intended)
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 Posted: Mon Aug 17th, 2015 02:04 pm
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Herb Kephart
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Valve gear is allowing steam admission too soon?

Herb



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 Posted: Mon Aug 17th, 2015 06:46 pm
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Helmut
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Not at all. There's always a small piston travel against a closed port: see here. On this site you can also check the PV diagram to see that there's always back pressure impeding the motion.



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 Posted: Tue Aug 18th, 2015 12:34 am
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Herb Kephart
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True--And I am aware of this. But if you get smoother running with the cocks open, it sounds like you have too much compression---or too much steam admitted the cylinder before the piston comes to top dead center at low speed.

Herb



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 Posted: Wed Sep 9th, 2015 03:43 am
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Ray Dunakin
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Wow, that little steam loco is a beauty! Too cool!



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 Posted: Wed Sep 9th, 2015 07:17 pm
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Helmut
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@Herb
I just now noted that on the trials, the drain cocks were open wide. Now that has been corrected, only a faint bleed is present during normal operation. They told me they then had not found a proper seal for the drain cocks and had left them open.

And sure I hope your second modelling life will be rewarding. Thank you for all that enthusiasm and effort you've put into this forum.

@all
My 12-yr old very reluctantly allows me to operate the throttle - in true arrogant engineer fashion he relegates me almost exclusively to the shed fireman's tasks of firing it up and cleaning out the soot.

Last edited on Wed Sep 9th, 2015 07:19 pm by Helmut



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 Posted: Wed Sep 16th, 2015 02:32 am
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Si.
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Hi Helmut.

Yep ! ... LARGE SCALE !!!

Dunno how I missed this thread...
...but just caught up on it !

Looks like a great way to 'play trains' !

Clever track solutions.

All the best.

Cheers.

Si.

:moose:



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Mon Oct 5th, 2015 07:13 pm
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Helmut
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Hi all,
I think it's time to update upon my activities. As you may know, the upper reaches of the garden have not yet been accessed by a permanent rail connection. So today a firm went in to do  the necessary digging and shovelling to prepare the ground for tracklaying. The container for the excavated soil could only be placed in the lower front next to the existing tracks. There's a distance of some 300' to be covered, all along the track that is already there. Normally they would have used a small caterpillar dumper, but it would have ruined the track. So I decided to make good use of the infrastructure and within 2 days, I sort of quick-and-dirty built a front-dump truck of the same capacity to roll along the rails. Providing access to the immediate worksite by rail proved to be some challenge, but I succeeded in doing so. See what it looks like:

That's the brakeable chassis I started with ( very important on a 6.5% grade! )

As I said, quick and dirty frame.

Married to the chassis.

The dumper in all its glory, takes four whellbarrow-fulls.

The rear side openes before..

you dump the whole contents.

Container access.

A moveable turntable to get the dumper from the main line to the container track.

It turns out like that..

And up to the destination.
Sorry, there's no load to show in the photos, was too busy getting all that stuff into the container.
Lo and behold, that contraption is bobbing!

Last edited on Mon Oct 5th, 2015 07:19 pm by Helmut



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 Posted: Mon Oct 5th, 2015 08:42 pm
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Si.
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Hi Helmut.

Nice dumper wagon !

Bond-baddie Christopher Walken was excavating with similar kit.

A plan to bring Brussels to it's knees (I hope).

All the best.

Cheers.

Si.



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Fri Oct 9th, 2015 09:50 am
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Helmut
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Hi all,
as it was too cumbersome to shovel all that dirt form the front into the back of the container, I devised a hydraulic lift in order to dump directly from top into it. Also I want to show you some photo of the lumber-tram-like operations during the excavations.

The track into the upper garden. You can see clearly where the temporary tracks are placed on the soil.

Upper end. One of the contractor's workers busy at filling the dumper.

The other one ( the daring type ) trundling downhill with a full load, some 250..350kg depending on how high the other filled it up. The brake lever is essential in this type of gravity operation!

The temporary ramp with climbing track. Once the guy came round the bend ( I feared he'd derail ) with such a speed that he rattled all the way up to the stop! Well, those people from the woods of Bulgaria have a different approach to safety sometimes...
A hydraulic hoist was put to good use.

before one could dump, some of the dirt had to be pushed out by shovel, as you have to lift the whole container which is hinged in front.



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 Posted: Fri Oct 9th, 2015 01:43 pm
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Herb Kephart
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I take my hat off to you and your son, Helmut.
Quite an ingenious number of work saving adaptations. Being the lazy type, I think I would have opted for the lawn taking a beating, however..

Herb



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