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  1. btrueblood

    Need help sourcing a custom-made Buna O-ring.

    I agree with Brian, that a well-made (generous radii) groove will accept a common round molded o-ring with minimal fuss. A bit of super-lube or silicone grease (or plain old lithium grease for bog standard Buna rubber) will help hold it in place if there is a lot of movement or even inversion...
  2. btrueblood

    SpaceX Starship missions

    One thing about the "move fast and break things" methodology is that it can be overdone to the extent that it leaves no time to conduct failure investigations and reviews, and thus precludes the important learning step in the iterative problem solving process. You'd think that, having blown up...
  3. btrueblood

    Titan sub noise heard on board support ship.

    "It's the fact you have two different materials joined together subject to all sorts of differential forces including bending, thermal contraction / expansion, water pressure trying to get into the joint, end cap force creating both direct axial load and some bending which may change as the...
  4. btrueblood

    Titan sub noise heard on board support ship.

    Manned submersible, possibly not. There already are unmanned submersible vessels using composite hulls, and they work for the depths they were designed for. https://www.compositeenergytechnologies.com/underwater-carbon-fiber-pressure-vessels/ "Through comprehensive engineering studies...
  5. btrueblood

    SpaceX Starship missions

    Would you be more comfortable on the Starship re-entering from lunar transfer orbit? It hasn't even made a successful return from sub-orbital speeds, and talk about heat shield issues...
  6. btrueblood

    Grim news... Trump's 2026 budget would slash NASA funding by 24% and its workforce by nearly one third

    New Horizons - this is a probe that is already past Pluto (having returned some spectacular pictures of same) and planning to intercept several more Kuiper belt objects before being mothballed...something like the Voyager probes. I'm thinking NASA can lobby for more funding once they point out...
  7. btrueblood

    Min/Max Roll Gap Drift in Danieli Pinch Rolls (Wire Rod Mill) – Need Troubleshooting Advice

    What Gr8blu said - "1. Have one or more bolts loosened (e.g. backed out), or has the bolt itself lengthened? Both can be measured and can give an indication of what is happening." You should be marking the bolt heads after the adjustment to see if they are rotating, and/or checking bolt length...
  8. btrueblood

    Speed of flash steam formation

    This is Eng-Tips.com, not Eng-domyworkforme.com
  9. btrueblood

    Speed of flash steam formation

    Take a slug of fluid, and assume: random particles (milli-slugs) across the slug will nucleate to vapor if Tfluid local is > boiling point at local pressure conditions. Note that the local expansion of these nucleate sites will raise the local pressure on surrounding areas of the droplet...
  10. btrueblood

    SpaceX Starship missions

    Rocketdyne struggled for years to get the F1 design to run stably throughout the launch. In the end, they traded engine efficiency for stability, but it worked. Later redesigns (F1A, F1B) would have brought back a lot of efficiency, but - big engines are hard to design, and there was little...
  11. btrueblood

    Speed of flash steam formation

    I've seen multi-phase CFD and cruder combustion simulations (think rockets, jet engines, even motor vehicles) where fuel (or oxidizer, think liquid oxygen) droplet injection is modeled, along with combustion and heat release, and the evaporation of those droplets is tracked over time whilst the...
  12. btrueblood

    Question silicone rubber elastic

    Best investment ever, it's always increasing.
  13. btrueblood

    Carbon capture con job

    "Stop with practices that are detrimental to our plants ability to absorb CO2.... Like clear cutting rain forests or old growth forests." Not sure that old growth forests are such great absorbers of CO2. At some point, old growth trees get diseased and blow down, to rot and release their...
  14. btrueblood

    Sealing documentation over groove specification?

    Quad rings have the advantage (for suppliers of them) that they can withstand far less wear than a regular o-ring before leaking.
  15. btrueblood

    Air Traffic control failures

    I'm glad my wife and I are on hiatus from air travel right now. Maybe we'll take more boat rides and driving trips in the near future.
  16. btrueblood

    Air Traffic control failures

    I've had coffee chats with people who looked at bidding on replacement LORAN systems (I may not be using the correct acronym, but the function was the same, i.e. radio navigation systems for planes), the contract would be linking existing systems into a newer, upgraded, remote-monitoring...
  17. btrueblood

    Stacking an object

    For as-hot-rolled A36 steel, parallelism between the top and bottom faces might also come into play, as the warping of the stack creates its own perturbations of the c.g. and value of the bending moment. I.e. the offset/non-vertical alignment of the stack increases its tendency to buckle.
  18. btrueblood

    Fuel Bladder Testing

    I had the same question: Base Engineer Emergency Force. Google will give you references...
  19. btrueblood

    Carbon River Fairfax Bridge - Closed

    The Carbon River is glacier-fed, and the canyon is a mess of loosely agglomerated ash and friable andesite rock from the volcano. People are injured and killed somewhat regularly on the Carbon river, because sunshine on the Carbon glacier in the afternoon causes rapid melting and subsequent...
  20. btrueblood

    Where to buy exotic steel alloy bars in low quantities?

    When I need quick delivery of a small bit of something exotic (i.e. not lying around on the shop floor) I surf over to McMaster.com and look there.

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