DJH A3

[3 LINK]

Hi Brian,

I think you will find that the steam delivery pipes worked on the " venturi principle " which helps to control the flow of sand rather than rely on gravity alone.

The same system is or was used on carburettors regarding the air flow, and it was also used on the FB5XB foam branch which I had the pleasure of using in my days in the fire brigade.

Martyn.

 

[oldravendale]

Oh yes, I remember the venturi principle. Makes perfect sense.

B

 

[oldravendale]

Hi Brian,

Another issue, I'm afraid..

On the right hand side of the engine, the reversing rod should be inside of the supporting frame, otherwise it could never lift the reach rid to the top of the expansion link for reverse gear..

Sorry to be the bearer of bad news..

JB.

I've had another look at the loco and I think it's right. The earlier photo looks as though the reversing rod is on the outside of the frame but it's actually not. At least, it's OK if I've interpreted your comments properly. Here are some more photos of the detail.



....or have I misinterpreted your comments?

Please ignore the odd bits of wire sticking out here and there - these will be tidied up when I come to the painting.

There now follows a random flying machine alert.



This is Anthony Aloyisius St John Montmorency Pigeon. Known to his friends as Speckled Jim.

He is a homing pigeon who crash landed in our garden. A friendly bird who feeds from the hand but keeps just out of reach. I've tried chasing him away but he keeps coming back. Sort of a boomerang bird. I was in the workshop with the door open and he crept in, crapped and crept out again. (The old ones are still the best!)

You may ask why he's on the elite pages of WT? Well, he's very nearly blue, here and there.

Brian

 

[oldravendale]

This is Anthony Aloyisius St John Montmorency Pigeon. Known to his friends as Speckled Jim.

He is a homing pigeon who crash landed in our garden. A friendly bird who feeds from the hand but keeps just out of reach. I've tried chasing him away but he keeps coming back. Sort of a boomerang bird. I was in the workshop with the door open and he crept in, crapped and crept out again. (The old ones are still the best!)

You may ask why he's on the elite pages of WT? Well, he's very nearly blue, here and there.

Brian

He wants to grow up to be an EMU.

Jacket and hat behind hook on door. Is that the men in white coats?

B

 

[Steph Dale]

Still haven't caught it yet then?
You wait - I bet there's someone on this forum who'll be able to tell you what to do...!

Steph

 

[oldravendale]

Still haven't caught it yet then?
You wait - I bet there's someone on this forum who'll be able to tell you what to do...!

Steph

Gottim with a half brick. Pigeon and chips tomorrow for tea. Yum!

 

[OzzyO]

Sorry to say it Brian but your not home yet with the valve gear!
Looking at your photos of the valve gear, you only have the lifting link on the outside of the valve rod. When it should have one on the outside and one on the inside, as below.


Sorry it's not a very clear photo. The lifting link is the bright part pointing at about 8 o'clock.

HTH

OzzyO.

 

[mickoo]

Sorry to say it Brian but your not home yet with the valve gear!
Looking at your photos of the valve gear, you only have the lifting link on the outside of the valve rod. When it should have one on the outside and one on the inside, as below.
View attachment 34505

Sorry it's not a very clear photo. The lifting link is the bright part pointing at about 8 o'clock.

HTH

OzzyO.

If I'm not mistaken, that's an LMS motion bracket but the principle still holds the same

I think that may be what has thrown JB, the fact that only the outer part of the link is modeled, thus making it too thin and appear too far out, I'm going to guess that the kit does not come with an inner side to the lifting link and thus requires fabrication by the modeller

I'm sure I have some A4 close ups of that area, which is all but identical to the A3...certainly visually (from dim memory, need to check photos to be 100% sure), there may be small measurment differences between the two classes, I'll check for photos when I get home.

This does make me wonder how far we actually go, if you fix this then there will be something else, no kit is ever perfect but somewhere you have to draw a line as to what your prepared to accept, I'd guess Brian is probably quite happy with the current rendition, some are even happier with less detail, others require more. It's not a criticism of either party just an observation that people have differing goals.

 

[oldravendale]

Thanks to OzzyO and Mickoo.

Both correct! The parts for the lifting link are intended to go one side only on the DJH Kit and there's a pin to hold it in place. I could laminate the second and inside part of the lifting link - it's entirely possible - but as far as I remember that makes taking all the valve gear down a bit of a trial. I guess it's a question of expediency at the end of the day. It'll be interesting to see how Finney deals with this.

I'll consider creating the prototypical sandwich, but I suspect may leave it as is. I'll also have a look at the Finney instructions to see if he gives any particular thought to the issue.

Brian

 

[mickoo]

Ok some photos, two to be precise

Lifting link and associated metal work on drivers side


Lifting link firemans side


Loco is in mid gear, these are A4 but I'm pretty confident the A3 is virtually identical. The large pipe partially obscuring the lifting link lay shaft (white) is the driving wheel sand box filler neck, the sand box is at low level between the frames as discussed before, but the opening to fill it is at foot plate level behind a cover in the stream line casing.

This fill pipe is also present on the A3; of basically the same form and shape and is present on both sides. The pipe dog legs through the frames just above the driving wheel brake hanger through an appropriate hole in the frames on both A3 and A4 locomotives.

Looking back through this thread, jeez, I'm such an anorak when it comes to LNER Pacifics

 

[Rob Pulham]

He wants to grow up to be an EMU.

Hi Brian,


Perhaps not as odd as you might think. In the allotment behind our cottage there are five EMU's - three 'normal' grey/brown coloured ones and two albinos. The latter two were raised by the gent who has the allotment from eggs and we have seen them grow from nothing to full (read pretty dammed big!) size



I will try to remember to take a photo next time we are up - albeit that the next time we go might (fingers crossed) be the day that we move out.

 

[oldravendale]

Looking back through this thread, jeez, I'm such an anorak when it comes to LNER Pacifics

Oh - I'm so gad you are! And thanks to OzzyO too.

However, having rechecked, and it's clear on photos, there should be a sand pipe between the leading and second set of driving wheels. They'll be fitted behind and coming from the brake gear. Not a disaster but just a damn nuisance to have to keep going back and modifying it.

As far as the reversing gear is concerned I'm afraid it'll be left as it is, but I'm now more educated about the refinements. Perhaps, as my skills improve, I'll attempt to create a more accurate rendition.

As ever, thanks for pointing out the deficiencies. The loco wasn't test run as I'd hoped last night. We were too busy fixing Dingham couplings for the 7mm layout and the fiddle yard for the 4mm layout. We'll try the running session next week! Once test run and final issues ironed out I'll add the missing sand pipes during the painting sequence.

(In fact, I may also, secretly, have a look at making the reversing gear right, but don't hold your breath).

Best and thanks again.

Brian

 

[oldravendale]

Hi Brian,


Perhaps not as odd as you might think. In the allotment behind our cottage there are five EMU's - three 'normal' grey/brown coloured ones and two albinos. The latter two were raised by the gent who has the allotment from eggs and we have seen them grow from nothing to full (read pretty dammed big!) size



I will try to remember to take a photo next time we are up - albeit that the next time we go might (fingers crossed) be the day that we move out.

I'm delighted to see that someone else is off the wall!

In fact it gives me the oppportunity to say that I didn't actually throw a brick at Speckled Jim. That would be cruel.

No, I tied a string round one foot so he now flies in circles.

Brian

 

[Scale7JB]

Sorry Brian, absolutely right, it was a trick of the light...!

JB.

 

[oldravendale]

Sorry Brian, absolutely right, it was a trick of the light...!

JB.

Apologies not needed. There were still a few things wrong anyway.

(Actually, I'm going in to a corner and sulking, but you don't need to know that).

B