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  1. 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...
  2. 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.
  3. btrueblood

    How to Air-Seal Oval Tube into Hole!

    In the rocket biz we would braze shaped, ovalized tubes into header pipes to form interesting bits of gear like rocket nozzles and combustion chambers. Welding would likely work too, if you design the joint for weld access. As LI said, no reason that the oring has to be used in a round joint...
  4. btrueblood

    New Patented High Speed Steel Alloys

    MoWie Steel (sounds like Bowie, of knife and/or rock star fame). MoWow Steel MoWie Wowee ... hmm, might be already trademarked for certain organic products...
  5. btrueblood

    Seeking Guidance on Developing an Adhesive Coating Formula

    My dental hygienist puts fluoride varnish on my teeth at the end of my tooth cleaning ordeals. The stuff sticks to my teeth and stays there for several hours, or until I eat or drink or brush my teeth. According to...
  6. btrueblood

    Premature Deterioration of Ozone Diffuser Gaskets – Request for Support

    Viton/FKM chemistry is...weird. The base polymer for FKM is not well controlled, and the chemistry for Viton A is a vinyl backbone which can be problematic with oxygen rich environments and high temperatures. People specify Viton or FKM for high temperature water and steam, when both...
  7. btrueblood

    Can you use 16 oz singed polyester bags that got wet?

    It's more of a time at temperature thing - polyester in cold or lukewarm water will hold up for a long time and is used as a wet filter fabric in those conditions, but as the temperature climbs it can suffer hydrolysis more and more rapidly. 180F is the general long-term use limit in submerged...
  8. btrueblood

    what creates stainless steel 304 wire spring back?

    Yes, a higher tensile strength will mean more spring back. Fully annealed wire will spring back less than 1/2 hard or full hard or spring temper wire. As Ed said, stainless wire also springs back more than carbon steel wire due to differences in work hardening between the two materials.
  9. btrueblood

    Blue Origin space tourism

    "Are tax dollars being used to supplment Katy Perry and other celebrities who are paying to ride into 'space'?" I don't know, are they? Virgin Space has been doing tourism launches as well. I doubt much in the way of tax dollars, other than FAA, and local and state taxes to maintain airspace...
  10. btrueblood

    L410 bag into prop

    The engine cowling looks like it's seen some things...
  11. btrueblood

    Two instrumemts, Same Loop

    Taicho, it's possible if only using the HART or similar digital communication over the loop, rather than the analog value of the current (standard 4-20ma output)
  12. btrueblood

    polymer coating of nonwoven fabric

    It must be heat bonded, since few adhesives work well on low surface energy materials like polyethylene.
  13. btrueblood

    Omniscient Elon Musk seez....

    I'm sure a person with your research skills can find items that are being considered. JWST would be my prime example.
  14. btrueblood

    The wheels are falling off the Net Zero Bandwagon 2025 edition

    I don't dispute that, but is your example one of those (you never said it was, nor show anything that proves it is...just noise and hype).
  15. btrueblood

    pressure drop test nitrogen instead of helium

    Sounded to me like the OP wants to measure a flowing pressure drop (total pressure loss) across an open or partially open valve, i.e. a Cv curve. But, as Wil said, you need to be more specific about what testing you are contemplating. It is still tricky to measure with nitrogen and then...
  16. btrueblood

    Omniscient Elon Musk seez....

    "I have my doubts as well, which is why I will continue to QUIETLY sit back, watch, and wait." Except for the QUIETLY part? Nothing Musk and his team have done is innovative, it is derivative, at least in the rocket biz. Tesla has done some cool stuff, but they were doing that before Musk...
  17. btrueblood

    The wheels are falling off the Net Zero Bandwagon 2025 edition

    "How many of these projects were funded by the US government? Here is another collapsing. It seems that there has been a massive collapse of the global green energy initiatives once DOGE started looking under the covers." The one you posted is in Wales, which despite what our president might...
  18. btrueblood

    SpaceX Starship missions

    You didn't read the article, his numbers are inflation adjusted. Your quoted numbers are for manned lunar missions (including ground support), not payload delivery to LEO. He's using the cost of just the first and second Apollo stages (boosters), not the much more complex and costly Command...
  19. btrueblood

    Tightest realistic tolerance of a 200mm ID cylinder

    Not sure why the cylinder needs to be stainless steel, but if it's for corrosion resistance more than strength, there are alternatives. An alternative corrosion resistant material would be glass tubing. It's formed to very tight (.001 mm) axial i.d. tolerances (shrink fit from the melt over...
  20. btrueblood

    Air assisted seal pressure vessel

    A sketch of the seal geometry might help. That said, the seal (presumably made from an elastomer?) will likely deform from the applied hydro test pressure and the internal air will equalize to be substantially the same as the hydro pressure.

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