Hello Bob,
What I understand is that Hydracushion is a devise in the center sill of the
car which cushions the "slack action" of starting and stopping (i.e.
switching). The aim was to help preserve the load on/in the car.
It works on the same principle as your car's shock absorbers.
FWIW, as a live steamer, I do find the discussion about water compressibility
quite interesting.
Thanks,
John Oglesby
--- On Tue, 8/19/08, Bob Werre <[EMAIL PROTECTED]> wrote:
From: Bob Werre <[EMAIL PROTECTED]>
Subject: Re: {S-Scale List} Re: water compresses
To: [email protected]
Date: Tuesday, August 19, 2008, 9:52 AM
Since I'm the one who started/asked the question, I should have probably
rephrased everything earlier. I guess what I was wondering was what the
term Hydra (and my mis-spelling Hydro) actually meant. From reading the
SP literature it states that the cushioning comes from a center mounted
spring system which seems to be shown in the scale model. My original
though was it might have something to do with liquid filled shocks.
Anyway I thank you gentlemen for your efforts, you have gone way above
my pay grade with knowledge!
Bob Werre
BobWphoto.com
Ed Kozlowsky wrote:
> OK, I'm going to say one more thing on the matter and then drop it.
> The difference of compressibility between water and steam is an order
> of magnitude, so naturally water would, for practical purposes, be
> considered incompressible in that context. But, that was not the
> context of the original statement. That had to do with cushioning
> freight car loads. Let me give an example relative to that. It's not
> inconceivable that a standard size large car or truck would have 30
> feet of brake line. A tremendous amount of pressure is applied to the
> brake fluid given the magnification of power brakes. If the fluid was
> water with an approximately 1% of compression, the water in the line
> would compress 3.6 inches, and that my freinds is one heck of a lot of
> brake pedal movement. It's enough movement to act as an effective
> "cushion" or spring, which is what the discussion started with. Not
> steam chests.
>
> Ed Kozlowsky
> Sanford, Maine
>
> --
>
>
>
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
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