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Steam speed records including City of Truro and Mallard

Yes, of course there are a couple of finer points! But the relative chimney length argument is common to double chimneys, Kylchaps, Lemaitres,...

المشاركة بواسطة: JJG Koopmans, ‏14 ديسمبر 2023 في منتدى: Steam Traction
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Steam speed records including City of Truro and Mallard

No, It is because of fundamental fluid dynamics! I have explained it before in the 6023 and exhaust discussions, but here it is again: Already in...

المشاركة بواسطة: JJG Koopmans, ‏13 ديسمبر 2023 في منتدى: Steam Traction
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Steam speed records including City of Truro and Mallard

Any chimney can draw more air, so using that as an argument for a Kylchap is not really a proper argument. The issue is that a Kylchap does it in...

المشاركة بواسطة: JJG Koopmans, ‏12 ديسمبر 2023 في منتدى: Steam Traction
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Steam speed records including City of Truro and Mallard

I beg to differ! The Kylchap trick is to draw the same amount of air and have a larger exhaust orifice area at the same time kind regards, Jos

المشاركة بواسطة: JJG Koopmans, ‏12 ديسمبر 2023 في منتدى: Steam Traction
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Steam speed records including City of Truro and Mallard

Well, the Coal-Board changed a lot of locomotives along this line, they must have had some reason to believe in it! Kind regards Jos

المشاركة بواسطة: JJG Koopmans, ‏11 ديسمبر 2023 في منتدى: Steam Traction
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Steam speed records including City of Truro and Mallard

In France the cost of coal transportation had to be added, given the location of mines they had to send coal trains the length and the width of...

المشاركة بواسطة: JJG Koopmans, ‏11 ديسمبر 2023 في منتدى: Steam Traction
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Chapelon and related Matters

Yes, correct! On a second look it appeared to be connected with a sliding block!

المشاركة بواسطة: JJG Koopmans, ‏20 نوفمبر 2023 في منتدى: Steam Traction
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Chapelon and related Matters

? Imho this would be true if there was no short link on the inside valve rod. Since there is a short link the above argument is also valid for the...

المشاركة بواسطة: JJG Koopmans, ‏16 نوفمبر 2023 في منتدى: Steam Traction
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Chapelon and related Matters

The drawing shows a 7" offset, using Pythagoras the length of the inclined side would be the square root of 1' 5 3/4" squared plus 7 squared...

المشاركة بواسطة: JJG Koopmans, ‏15 نوفمبر 2023 في منتدى: Steam Traction
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Chapelon and related Matters

Sorry, this is a website that quotes from a book. Imho this is "scientific" hearsay! Chapelon himself discussed these locomotives in his 1952...

المشاركة بواسطة: JJG Koopmans, ‏4 نوفمبر 2023 في منتدى: Steam Traction
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Locomotive Performance and Tractive Effort Discussion

Were the "Selkirk" tests not with a high-powered locomotive with conventional exhaust? A changeover to a modern multiple exhaust for the same...

المشاركة بواسطة: JJG Koopmans, ‏14 ديسمبر 2022 في منتدى: Steam Traction
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Locomotive Performance and Tractive Effort Discussion

In the above it is stated that supersonic exhaust flow always exists. This is only true in the case of the Red Devil which was redesigned for...

المشاركة بواسطة: JJG Koopmans, ‏14 ديسمبر 2022 في منتدى: Steam Traction
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35011 General Steam Navigation

It took me some time to think this over! In general a 8-orifice jet unit should be slightly better than a 7 jet type. However a single chimney of...

المشاركة بواسطة: JJG Koopmans, ‏25 إبريل 2022 في منتدى: Steam Traction
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Edward Thompson: Wartime C.M.E. Discussion

Southern Locomotives ltd has a copy. I received a pdf from them. There is also a report from the University of Illinois, now available on the net,...

المشاركة بواسطة: JJG Koopmans, ‏8 ديسمبر 2021 في منتدى: Steam Traction
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Does steam and diesel have a future?

Steel requires a small carbon content. So as long as steel is made from ore, even in a hydrogen process carbon has to be added. As for oil, would...

المشاركة بواسطة: JJG Koopmans, ‏17 نوفمبر 2021 في منتدى: Steam Traction
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Does steam and diesel have a future?

I have suggested a change since 2006. It took new and younger management that had some vision on the future of steam locomotives to test a more...

المشاركة بواسطة: JJG Koopmans, ‏15 نوفمبر 2021 في منتدى: Steam Traction
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Does steam and diesel have a future?

Biocoal was tested some time ago with locomotive 5 of SHM in the Netherlands. Since the product used had half the calorific value of the mined...

المشاركة بواسطة: JJG Koopmans, ‏15 نوفمبر 2021 في منتدى: Steam Traction
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9F With Giesl ejector

Frankly I do think not very much. I reconstructed the 9F graph with the Rugby test data showing little difference between the effect of the...

المشاركة بواسطة: JJG Koopmans, ‏6 نوفمبر 2021 في منتدى: Steam Traction
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9F With Giesl ejector

Yeah! I know, the Giesl had the lowest backpressure, then the double chimney and the single had the highest. I had some comparative graphs which I...

المشاركة بواسطة: JJG Koopmans, ‏5 نوفمبر 2021 في منتدى: Steam Traction
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Draughting arrangements for Bulleid Pacifics including the Giesl ejector

Please, don't! Draughting and vision impairment are interconnected this time! Kind regards Jos

المشاركة بواسطة: JJG Koopmans, ‏12 إبريل 2021 في منتدى: Steam Traction

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