Sideplay For Wheelsets Of A 8-wheel Tender

[Dog Star]

There is not a lot of room between the sideframes of a LNER 8-wheel tender.... so side play has to be controlled carefully and thereby hangs the rub.

[1] minimal on leading and trailing axles, sideplay on inner pair of axlesz?
[2] minimal on leading axle and third axle, sideplay on second and trailing axle?

Or some other combination?

What would you do?

thanks, Graham

 

[Buckjumper]

Option 1.

 

[mickoo]

Agree, option 1 and maybe some flange reduction to boot depending on proposed minimum radius.

Kindest

 

[Dog Star]

Minimum radius... ? Hmmm.

Well the engine portion has negotiated 7' 6" radius curves on our Forest of Dean layout and I hope that the finished A4 will have running rights over Hartley Hill where the ruling radius is 60'. Otherwise - who knows!

Option [1] eh guys? Well that surprises me because I was expecting [2] on the basis of shortening the distance between the axles which have no sideplay (a conclusion based upon placing the tender frame with wheels over a curve drawn on paper).

thanks, Graham

 

[Dikitriki]

Hi Graham

The problem with option 2 is that you will have much more of an overhang at the rear than would look acceptable round curves, particularly running tender first. My vote is for option 1 too.

Yours

Richard

 

[Dog Star]

Richard, what you say makes sense... maybe I ought to see what happens if I put the sideplay on the leading and third axles with no sideplay on the second and trailing axles! (on the basis that the rear of the engine has overhang on curves... hence overhang on the front of the tender would match the engine.... ).

Time to try...

thanks, Graham

 

[Buckjumper]

...a conclusion based upon placing the tender frame with wheels over a curve drawn on paper.

A curve drawn with gauge widening appropriate to it's radius?

Wherever possible I'd keep the outer axles fixed with the absolute minimum sideplay to eliminate waddle at either end. You're building an A4, but last I heard, it wasn't 60022...

 

[Eastsidepilot]

I'd go for option one, but I'd like to know if there is any gauge widening ?

ATB, Col.

 

[Dog Star]

I'd like to know if there is any gauge widening ?

On our home layout - I have included gauge widening for the reverse curves and for the closure rails of the turnouts. Hartley Hills is 60' radius curves and the equivalent of C8 turnouts so there is no gauge widening there. What has been included for West Mersea?

 

[Susie]

I would have said go for option 1, but recently reading FAS Brown's book on the eary Great Northern, it appears that the 8-wheel carriages (as opposed to bogie vehicles) had fixed inner wheels and side play on the end axles...

Susie

 

[Buckjumper]

I would have said go for option 1, but recently reading FAS Brown's book on the eary Great Northern, it appears that the 8-wheel carriages (as opposed to bogie vehicles) had fixed inner wheels and side play on the end axles...

In the 1860s the Metropolitan had 8-wheel non-bogie carriages with lateral movement on the outer axles (and due to their excessive movement, only brakes on the inner fixed wheelsets), but these were soon replaced with radial axleboxes because the wheels regularly lifted clear of the rails around the tighter radius curves and hurled the carriages into the ballast.

I suspect the minimum radius on the GN was significantly greater than that on the Met.

 

[Eastsidepilot]

On our home layout - I have included gauge widening for the reverse curves and for the closure rails of the turnouts. Hartley Hills is 60' radius curves and the equivalent of C8 turnouts so there is no gauge widening there. What has been included for West Mersea?

We have gauge widened the closer rails on our pointwork also, the tightest curves( 9'-0" radius) are on the external link, between the station and the workshop cassettes. ATB, Col.

ATB, Col.

 

[mickoo]

Graham, on a slightly different tack, which A4 kit do you have, any feedback or photos to show and tell .

Kindest