Torpedo ventilators

One of the topics we discussed on the Gaugeone3Dcircle weekly zoom call today was torpedo ventilators.
The outside is easy enough to model but we then realised we didn't actually know what the inside was like. One participant was able to say that he had once seen inside one and it wasn't as expected, but we also noticed they are not aligned along the carriage as theory expects. Google has not immediately yielded a picture of one in bits nor a drawing.
can anyone help?

No idea but found here

The design will be to keep the weather out sooo... it must induce an eductor type airflow which draws air out of the cabin... is my guess

Some more pics here

Looks like slots across the top of the torpedo each side of the support (going fore and aft), and a second slot in the base which can be closed

Edited By Ady1 on 07/04/2023 01:29:53

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That’s an excellent find, Ady … my curiosity is aroused !

MichaelG.

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Edit:

http://www.furnessrailwaytrust.org.uk/about/blog/?p=2298

https://www.spicersauctioneers.com/catalogue/lot/fb947702dc20e469ba19d0b3467d8d2e/2a6fa85538c56e3991b429b74f737ad8/collectors-including-movie-posters-trading-cards-vi-lot-13/

https://worldwide.espacenet.com/patent/search?q=pn%3DGB190412939A

Q.E.D.

Edited By Michael Gilligan on 07/04/2023 08:32:03

The classic operation is supposedly that the torpedo is in line with the airflow ie along the carriage, and so the air flowing between the torpedo and the outer ring (rain guard) has to flow faster. Faster air is at lower pressure so then making holes in the torpedo in the middle should allow air to flow from the inside into this low pressure area. Simple.
But apparently not in practice.
Still need someone in a preserved railway repair shop to take one apart and be the first to post a picture on the internet. (or maybe ask a chatbot as they are in the news again today).

The word ‘incompetence’ springs to mind

… my own curiosity is sufficiently satiated by finding the patent.

MichaelG.

I tried to log onto one of the chatbots and the second thing they asked me for was my home phone number

So they're using the publicity for personal information harvesting

More torpedo vents here

But the underneath one looks confusing

Edited By Ady1 on 07/04/2023 10:01:06

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Perhaps you could take the initiative, and write to Furness … their blog contains plenty of evidence that Fred cleaned, repaired, and repainted theirs.

MichaelG.

Well done finding the patent MG.

Another view of the underside 'pattress' here on the Altrincham group's restoration.
Perhaps the airflow side on to the torpedo produces low pressure above and below as with an aircraft wing and the slot described in the patent exploits that. The airflow due to the rainshield outer part though would make the currents complex.

Strange how you don’t “see” details until they have been a topic of conversation. I have seen this bus at Shuttleworth many times (one of our neighbours drives it on occasion), but had not noticed the ventilators on the roof until today.