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  1. JJG Koopmans
    Post

    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,...
    Post by: JJG Koopmans, Dec 14, 2023 in forum: Steam Traction
  3. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Dec 13, 2023 in forum: Steam Traction
  4. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Dec 12, 2023 in forum: Steam Traction
  5. JJG Koopmans
    Post

    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
    Post by: JJG Koopmans, Dec 12, 2023 in forum: Steam Traction
  6. JJG Koopmans
    Post

    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
    Post by: JJG Koopmans, Dec 11, 2023 in forum: Steam Traction
  7. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Dec 11, 2023 in forum: Steam Traction
  8. JJG Koopmans
    Post

    Chapelon and related Matters

    Yes, correct! On a second look it appeared to be connected with a sliding block!
    Post by: JJG Koopmans, Nov 20, 2023 in forum: Steam Traction
  9. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 16, 2023 in forum: Steam Traction
  10. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 15, 2023 in forum: Steam Traction
  11. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 4, 2023 in forum: Steam Traction
  12. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Dec 14, 2022 in forum: Steam Traction
  13. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Dec 14, 2022 in forum: Steam Traction
  14. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Apr 25, 2022 in forum: Steam Traction
  15. JJG Koopmans
    Post

    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,...
    Post by: JJG Koopmans, Dec 8, 2021 in forum: Steam Traction
  16. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 17, 2021 in forum: Steam Traction
  17. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 15, 2021 in forum: Steam Traction
  18. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 15, 2021 in forum: Steam Traction
  19. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 6, 2021 in forum: Steam Traction
  20. JJG Koopmans
    Post

    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...
    Post by: JJG Koopmans, Nov 5, 2021 in forum: Steam Traction
  21. JJG Koopmans
    Post

    Draughting arrangements for Bulleid Pacifics including the Giesl ejector

    Please, don't! Draughting and vision impairment are interconnected this time! Kind regards Jos
    Post by: JJG Koopmans, Apr 12, 2021 in forum: Steam Traction
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