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Re: Wild Rose ~ Quarry Hunslet

Posted: Thu Apr 04, 2019 5:27 am
by dewintondave
When you hear your loco's voice for the first time


Re: Wild Rose ~ Quarry Hunslet

Posted: Thu Apr 04, 2019 9:51 am
by FWLR
Not a bad effort that Dave. :thumbright:

Re: Wild Rose ~ Quarry Hunslet

Posted: Thu Jul 11, 2019 7:58 am
by dewintondave
Getting back in to it now! I've been working on a gas burner to slot-in instead of the grate. Had some success in the end lighting it inside the firebox.



Burner without end caps
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When I made the steam powered diesel I made a nifty jig for drilling the 4 cross holes in the thin tube, I copied the jet holder too
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Re: Wild Rose ~ Quarry Hunslet

Posted: Thu Jul 11, 2019 8:02 am
by FWLR
Brilliant job there Dave. Well done... :thumbright: :thumbright:

Re: Wild Rose ~ Quarry Hunslet

Posted: Fri Jul 12, 2019 2:49 am
by dewintondave
Thank you lads. When I built the steam diesel I bought a wide selection of gas jets that are spare parts for camping stoves from our local big box store. They range from 0.11mm to 0.23mm, the steam diesel is using the 0.23mm jets
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Yesterday I was testing this new burner with a 0.17mm jet and it wouldn't light at all outside. I tried it in the firebox and got a great big backfire :bom: (Mrs B thought it was from out on the street) I swapped the jet for the 0.11mm and it lit easily as seen on the video.

Todays testing the burner with this same jet outside of the firebox showed some interesting results. It doesn't matter how far in the burner the tube is, the result is the same. But when I flipped the burner tube around to use the wrong end for the jet holder the flame was much better. For this burner having the entrainment holes further than usual from the jet helped.

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Re: Wild Rose ~ Quarry Hunslet

Posted: Fri Jul 12, 2019 5:15 pm
by GTB
I'm not a particular fan of ceramic burners. The only one I've built was no better at boiling water than a poker burner with the same size jet. I can see the point of using them in locos designed for dual coal and gas firing, but remain unconvinced otherwise.

I'n considering building a perforated plate type as an alternative to the ceramic burner, to see if it gives any improvement in output.

A few more points to think about, from the poker burner side of the fence.......

Butane has a narrow flammability range, 1.6-8.4%v/v in air is usually quoted. The range for Propane is similar.

Which means there's not much wiggle room to get it right, especially as we want to be close to the stochiometric ratio of butane to air which is 3.2% by volume. The heat output will start to drop as the air fuel ratio moves away from that point.

All my operational boilers have poker burners and are around 55% efficient at turning butane and water into steam at 40psi, but I've never seen numbers quoted for ceramic burners. Poker burners work over a gas pressure range of about two, ie. the max heat output with the gas wound right up is about twice the heat output with the gas turned down to the minimum stable flame. The max. heat output is set by the jet size.

With poker burners, I've found the Roundhouse arrangement with rows of holes the quietest type and easy enough to make. The ones with slots are noisier and while they can be quietened with stainless steel mesh inside the poker, it restricts air flow, reduces heat output and can make the burner harder to light. I also found that putting a few strands of teased out stainless steel wool inside the poker quietened things down, but that also restricted air flow and reduced heat output.

The most interesting poker burner I own came in an Aster Krauss kit. The poker is formed from perforated stainless steel sheet and suspended in the centre of the flue. It burns very quietly, as the gas velocity is low and the efficiency is as good as the Roundhouse design.

Regards,
Graeme

Re: Wild Rose ~ Quarry Hunslet

Posted: Sat Jul 13, 2019 8:09 am
by dewintondave
Well, what an interesting subject this is.

I thought I'd have some fun with an overly long gas tube, first with 2 air holes then 3 then 4. With 2 air holes the gas tube made a great bunsen burner, but with all 4 only a small flame could be maintained before it got blown out. The long tube gave the best gas burner burn too.
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Re: Wild Rose ~ Quarry Hunslet

Posted: Sat Jul 13, 2019 8:15 am
by FWLR
Bunsen Burners.....Those were the days..... :roll: :roll:

Re: Wild Rose ~ Quarry Hunslet

Posted: Sat Jul 13, 2019 11:16 pm
by dewintondave
FWLR wrote: Sat Jul 13, 2019 8:15 am Bunsen Burners.....Those were the days..... :roll: :roll:
Happiest days of our lives eh Rod ;)

Here's one I prepared earlier, the rosebud grate and ash pan. I used the grate as a drilling jig for the gas burner. There was no way I was going to drill those holes the hard way again :D
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Re: Wild Rose ~ Quarry Hunslet

Posted: Sun Jul 14, 2019 8:48 am
by FWLR
Great idea for saving you some time and perhaps frustration Dave.... ;) ;)

Re: Wild Rose ~ Quarry Hunslet

Posted: Mon Jul 15, 2019 12:55 am
by dewintondave
Oily Rag wrote: Sun Jul 14, 2019 9:28 am Hi Dave,
Can I ask if you have achieved a "blue cone" at every hole yet? The pictures seem to show only certain select holes having a correct flame. The blue cone attached to the burner is a pretty sure way of knowing you have the correct mix and ratios.
No I haven't, infact with the standard length burner tube which I'm using, the front row aren't alight outside of the firebox.

With the gas turned right up with the burner in the firebox the flame had an orange tinge to it last night, which is good as the loco will have draught at all times in use.

Re: Wild Rose ~ Quarry Hunslet

Posted: Wed Jul 17, 2019 8:14 am
by dewintondave
What I've done
Recently I've reduced the length of the regulator handle, it was far too long
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What I've got to do

Finish the firebox door
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Mount the whistle
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Plumb-in the whistle
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Make mountings to secure the grate and gas burner
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Re: Wild Rose ~ Quarry Hunslet

Posted: Wed Jul 17, 2019 8:38 am
by FWLR
It's still very impressive Dave. I do love your workmanship. :thumbright:

I am really looking forward to seeing her running with a full head of steam. :thumbright: :thumbright:

Re: Wild Rose ~ Quarry Hunslet

Posted: Wed Jul 17, 2019 9:04 am
by tom_tom_go
Regulator handle looks much better, I didn't realise it was the large before.

The cab layout is very organised, I like it.

Re: Wild Rose ~ Quarry Hunslet

Posted: Mon Jul 22, 2019 8:20 am
by dewintondave
The fire hole door is done. It's got a counterweight to keep it closed. I had fun blackening the steel weight in old mower oil yesterday


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Re: Wild Rose ~ Quarry Hunslet

Posted: Mon Jul 22, 2019 8:32 am
by FWLR
Brilliant..... :thumbright:

Re: Wild Rose ~ Quarry Hunslet

Posted: Wed Jul 31, 2019 9:04 am
by dewintondave
I have been reducing the head height of roundhead screws to fill all the holes that I overeagerly drilled for the cylinder port blocks. Standard height is too close to the face of the port block. The frames are going to be black so I tried oil blackening the head of one to try it out. It looks good. I'd rather not spray over the screws.
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Re: Wild Rose ~ Quarry Hunslet

Posted: Wed Jul 31, 2019 9:48 am
by FWLR
Done a great job there Dave... :thumbright: :thumbright:

Re: Wild Rose ~ Quarry Hunslet

Posted: Fri Aug 02, 2019 9:24 am
by dewintondave
Thanks Rod.

Progress is being made. The whistle connecting pipe is done. The whistle is installed. The gas burner mounting is arranged. The sight glass drain pipe is fitted.

I wanted to lower the lubricator lid as it sat too high, I think I forgot about the thickness of the o-ring. It's soldered to the buffer beam spacer, so I decided to skim a bit off the top in the lathe.
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Re: Wild Rose ~ Quarry Hunslet

Posted: Fri Aug 02, 2019 9:48 am
by tom_tom_go
That looks better.