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truffy

Hornby W1 Hush Hush

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43 minutes ago, Headstock said:

The sound that the locomotive made has been described as Hush Hush.

 

That was the alternative (and better) explanation, other than it being super secret, that I read for its nickname.

 

43 minutes ago, Headstock said:

What's a R8119?

 

A Hornby TTS sound decoder.

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1 hour ago, truffy said:

 

That was the alternative (and better) explanation, other than it being super secret, that I read for its nickname.

 

 

A Hornby TTS sound decoder.

 

Thanks truffy / Nigel,

 

I figured it was a sound decoder, I should have elaborated. What is specific about that particular model that would make it suitable for the Hush Hush?

Edited by Headstock

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1 hour ago, Headstock said:

What is specific about that particular model that would make it suitable for the Hush Hush?

 

 

I'm not really 'genned up' on decoders, especially sound ones, but I understand that Hornby TTS sound decoders are fairly basic. I suspect that @Bishdurham's comment may have been tongue-in-cheek, hence the ":-)"

 

Perhaps @Bishdurham could disabuse me of any misunderstanding.

Edited by truffy
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18 minutes ago, truffy said:

 

I'm not really 'genned up' on decoders, especially sound ones, but I understand that Hornby TTS sound decoders are fairly basic. I suspect that @Bishdurham's comment may have been tongue-in-cheek, hence the ":-)"

 

Perhaps @Bishdurham could disabuse me of any misunderstanding.

 

Thanks, Nigel,

 

I probably haven't initialised emojis, so I don't see them. The same question applies to Cock 'O' the North. What exactly does a three cylinder locomotive with Lentz rotary cam poppet valve gear and a Kylchap double blast pipe sound like? The closest would probably be the 'Duck' in preserved condition.

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5 hours ago, Bishdurham said:

Maybe a Hornby R8119 would work?

 

Very witty!  :locomotive:

 

(An R8119 is a TTS decoder for an English Electric Type 4 diesel...)

 

Personally I'd have suggested R7140 OR R7239, though for verisimilitude, R8107 might be the best bet.....

 

 

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Thanks to Hroth for explaining to those  of us less familiar with the wonders of TTS decoders.

 

I quite like the idea of the R7140  HST (Valenta)!

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The latest update to The Engine Shed didn't give much on the development, except that research began in 2015 and the project was revived and expanded in 2019. But some very tempting cab shots!

 

image.png.a542ca26ab958d35e64d8041808b51a3.png

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Quite interesting to see the difference inside the cab between the 2 boiler types. 

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Is that a dual control - LH / RH - regulator on the A4-styled one?

 

Al.

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On ‎22‎/‎01‎/‎2020 at 17:52, Bishdurham said:

I wonder what sound it made?  Quick look on Youtube and the original footage was silent.  Would a HP Boiler make different sounds?  I suppose changing the chimney would also have some difference?

The major contribution to the sound output is the release of the exhausting (low pressure, hopefully) steam through the system of an 'organ pipe' and resonating chamber which is the blast pipe, chimney and smokebox. The hoped for more efficient expansion of the steam which is a core principle behind compounding, should result in lower pressure at exhaust when running compound, and thus a quieter exhaust than from a simple loco performing equivalent work.

 

All that said, the water tube boiler is a very different beast to fire tube, in that there is a continuous large cross section void all the way from grate to chimney aperture, and it was noted that the outer shell was sufficiently 'worked' by the induced partial vacuum that it developed air leaks.

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On 01/02/2020 at 06:32, Hilux5972 said:

Quite interesting to see the difference inside the cab between the 2 boiler types. 


Yes. I thought that too. 
 

There’s definitely an opportunity for a future edition of the Engine Shed to explain more about the W1’s unique boiler and how it was driven and fired compared to a conventional locomotive. 

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6 hours ago, MrTea said:

...There’s definitely an opportunity for a future edition of the Engine Shed to explain more about the W1’s unique boiler ...

https://www.lner.info/locos/W/w1.php

 

There's a picture in that article giving a good idea of the gubbins inside the external boiler casing. Very different to the usual Stephenson fire tube boiler isn't it?

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If it was truly Hush Hush would it need a sound decoder at all? ;)

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