Problems with the K-3 Mountains ?

[NW Mailing List]

What is so amazing is, after reading American Steam Locomotive (and others)
is just how much physics was unknown to the engineering world back then. Or
if known, not practical to use.

Many things like dynamics and thermodynamics were just not understood.  I
mean even today some of this stuff is understood but we can only do the
math because of powerful computers that can solve problems analytically
(e.g trial and error).

After reading some on the topic and talking with you all in this list, I
have lots of respect for the people who designed/used this stuff.

David Baker

On Wed, Nov 29, 2023, 12:41 PM NW Mailing List via NW-Mailing-List <
nw-mailing-list at nwhs.org> wrote:

> I looked at the write up in the N&W Magazine following Abe’s question - I
> recalled that the main rod length (the longest applies to any N&W
> locomotive) was discussed there.
>
> It stated the primary reason for the third driver connection was because
> of excessive rod angularity if the main rod were connected to the second
> driver, which would lead to excessive stress, heat and racking at the
> crosshead guide. Given that concern, rebuilding wouldn’t have made sense,
> trading one problem for another.
>
> It’s an interesting article, with its main focus being
> cross-counterbalancing.
>
> Matt Goodman
> Columbus, Ohio
>
> Sent from my mobile
>
> On Nov 28, 2023, at 10:15 AM, NW Mailing List via NW-Mailing-List <
> nw-mailing-list at nwhs.org> wrote:
>
> 
> Abe,
>
> C.E. Pond told me that one of the main problems with the K-3 was "Too much
> angularity at the crosshead."
>
> Tim Hensley
>
>
> On Tuesday, November 28, 2023 at 09:57:15 AM EST, NW Mailing List <
> nw-mailing-list at nwhs.org> wrote:
>
>
> Please pardon my very puerile understanding of the mechanics involved...
> but could not have the problems of the N&W's K-3 Class Mountains have been
> fixed by making the main rod connect to the #2 driver, instead of the #3
> driver ?
>
> Or would that have involved an overly-expensive complete rebuild of the
> machinery?
>
>     -- abram burnett
> Retrograde Frequency Turnips
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