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foeth

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About foeth

  • Birthday 10/10/1975

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    ontheslipway.com
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    Wageningen, Netherlands

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  1. Small blog update with bits of Warspite https://ontheslipway.com/hms-warspite/ (see link for dates)
  2. I ordered the panels in two batches; didn't want to commit to three panels before all errors were ironed out. Price went up by over a quarter... Now they don't even have the panels in stock anymore, but the prices for Walnut was about 240 EUR/m2, and I had about 2m in waste alone... (used that for spares and may use most of that for something else).
  3. I'm happy to continue too The modeling itch became unbearable... the last two speakers were really a drag so I'm glad that is now done. Next weekend I'll make some jigs to support the main deck parts (painting and handling, should have done that earlier) and make a list of supplies I need. My plastic glue bottle evaporated so can't do much at the moment! The wood is American Walnut; I used prefab panels typically used to make furniture. Wenge would have been even more beautiful but the price of these panels has soared over the years.... had to stop somewhere...
  4. Woodworking done! Back to HMS Hood! Build log of this time vampire here: https://ontheslipway.com/lx521-introduction/
  5. https://www.maritiemdigitaal.nl/index.cfm?event=search.getsimplesearch&saveToHistory=1&database=ChoiceMardig&needImages=YES&searchterm=kortenaer-klasse https://www.maritiemdigitaal.nl/index.cfm?event=search.getsimplesearch&saveToHistory=1&database=ChoiceMardig&needImages=YES&searchterm=S-fregat https://nimh-beeldbank.defensie.nl/foto-s/?mode=gallery&q=S-fregat&page=1&record=51e5f0c0-39b1-df7b-0caa-082e7df21d6c&view=horizontal Quantity < Quality, but soit. Useful searchterm is probably S-fregat.
  6. We tried keelhauling at first, but our largest models are only about 15 meters long and 2 m wide, so that just didn't cut it
  7. Ducks are actually a great subject to study if you're interested in wave patterns (or ducks for that matter) as they clearly show the diverging wave pattern. In fact, for our National Science quiz we actually sent in a question what would happen to the angle of the bow wave if a duck speeds up to fetch a duckling that wandered off.... All my colleagues who did not give the right answer were fired; shame.
  8. Well sure, why not: https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/waveriding-and-wavepassing-by-ducklings-in-formation-swimming/94759A0FF7070D9D7CAC5907594B1781
  9. Yes, that is a very good page! He refers to "Principles of Naval Architecture" a few times; the co-author of the latest volume on ship resistance is the author of the code I used to calculate the wave pattern and he occupies an office down my hallway (that is, not now due to Covid...:( ).
  10. Please do! Most warships are quite slender and copying the wave pattern would work quite well. There are always differences, and comparing the pattern to photographs would work best I think. These images might help udnerstanadong what to look for. This calculation doesn't include wave breaking and so on, and you need good pics to model that. I've been planning writing down what it is you see in a pattern for ages but never really felt like actually finishing that (also wondering if people have the attention span to read with youtube two clicks away so never bothered). I uploaded jpegs as well, just change the speed in the URL between 11 and 32 to get another pattern; this one shows 22 knots. Note that the scale for the colour outline is every quarter meter, so most of the bow waves remain below +/- 1m; not that much in 350 scale! With a bit of seaway this wave pattern can become undiscernable, so there's major artistic license. The main thing to pay attention to is the wave pattern from the bow. For Hood this bow wave become more noticeable around 17-18 knots. I'm not really a wave person, but I do notice a few things that modelers often miss The angle of the bow wave does not depend on ship speed; this angle is constant at about 39 degrees. The animation shows this as well. The angle remains the same, only the distance between the waves increases. The bow wave is not a single large diverging wave but this undulating pattern you can see above. Most diorama's aren't too wide but you can still get this "in frame". The wave pattern at the stern is not super accurate; there is no propeller action in this simulation and also no effect on friction (edit: or wave breaking; the effect of very steep waves is not captured here). A trade-off between a few hours of work and some assistance from our CAD engineers, versus several days of work and a lot of CPU time... But adding some modeling froth will go a low way. This pattern would not work well for bluff hulls such as subs at the surface, or trawlers and tugs. For high speed craft the pattern changes as well, so fast cruisers exceeding hull speed and planing (the transom-sterned vessels). For most carriers and battleships it should work well enough,
  11. Of course, that will take a small while. When the project is rebooted I need to finish the main superstructure parts (nearly done though), do a beauty pass of the hull plus painting, then do the waves. But I am looking forward to that part Hide that hideous underwater hull (mistakes were made).
  12. The woodworking is progressing slowly in the weekends, still displacing HMS Hood for the moment. I expect to pick up the project in 2022. I've neglected her for so long that meanwhile my Plastic Magic Glue bottle fully evaporated (yes, the cap was on) so I can't do any modeling anyway. The Dutch IPMS where I wanted to stock up was cancelled... As naval hydrodynamicist with an idle laptop and access to some cool company tools, what can you do when in a Hood mood? Calculate the wave pattern, of course. This is the wave elevation from 10 to 31 knots in steps of 1 knot. I'll probably go for a 22-25 knots speed or thereabout, where Hood sinks in about half a meter as well (squat) and no trim. Some swell will be added anyway; with some waves around you rarely see the calm-water as perfectly as you do here. Took some time to properly visualize the pattern. Dashed line is zero difference wrt calm water, scale in meters (none of those units from middle earth).
  13. That should be dribbling slate-faced lunatics; can't they do anything right Usually I assemble as much as possible as long as I think I can reach all area's that need masking; so large bridges structure and turrets can be assembled, though the various upper deck parts of the bridge are probably best added one after the other.
  14. Yes I have and the speakers sound stunningly good! That is, after I replaced one driver that seems to be broken, and there's still some noise coming from the DIY amps that needs to be removed (no idea how though, have to experiment a bit, must have done something wrong!)
  15. Three out of five done, two more to go. These are ready to be assembed but vacation ran out... Three weeks of dedication & cursing wood for being such a weird material. Hood is just of out of the frame at right and has to wait a bit longer....
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