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Recent content by Brian Malone

  1. Brian Malone

    Air Force Diverts Missile Funds To Modify Qatari 747... Money is being taken from Sentinel ICBM program, which is over budget.

     Tugboat - my suggestion was not directed toward only you, it is for all who are politicizing this discussion on funding for engineering-based endeavors. I am not sure if your comment on "delusions" is directed to me. I have not spoken of any politics. Edit - my suggestion was my first post to...
  2. Brian Malone

    Air Force Diverts Missile Funds To Modify Qatari 747... Money is being taken from Sentinel ICBM program, which is over budget.

    I will suggest but it may futile, that the discussion stay centered on the non-political engineering interactions/ramifications and not meme-opinion barbs. The slope of that rabbit hole is slippery . . .
  3. Brian Malone

    Explosion at fireworks storage facility in Northern California

    Remains of seven victims have been recovered: https://www.sacbee.com/news/local/article310074010.html
  4. Brian Malone

    Explosion at fireworks storage facility in Northern California

    Investigation is ongoing - this is not directly engineering but certainly, ruling out a malicious action, there will probably be failure(s) to follow standard protocols, methods of handling, and storage of fireworks/explosive devices/materials for this warehouse to have exploded and wiped out...
  5. Brian Malone

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

    dgeesman - thanks, all good! The guidance given by the posts that explain sizing the o-ring to avoid/minimize putting it in compression within the groove perimeter is what helps make the seal less prone to pop out. Zero response from the OP, so hopefully they have gleaned a little guidance and...
  6. Brian Malone

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

     dgeesaman - "That photo feels implausible to me, especiall with the groove depth barely reaching the centerline of the o-ring body" I am on the fence over whether I should post a more complete photo of the example I offered to counter your skeptical remark but the full geometry is part of a...
  7. Brian Malone

    What process / method to make this aluminum edge?

    Look up edge curling/roll-forming/ hemming. https://ems-metalworking.com/edge-curling-machine/
  8. Brian Malone

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

    No glue used - the schmutz is just debris on a part returned from service. The part of the seal on the right is just I was lazy and did not push that area of the seal down and took a bad photo. :-) I place o‐rings in uncircular grooves without issue. No ruptures or squirms. Certainly, this is...
  9. Brian Malone

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

    3DDave and  Compositepro, your guidance on o-ring cord stock is correct since the OP's seal is not close to a standard AS568 size. An option would be to redesign the seal parameters to be nearer to a -268 or -269 to allow use of an off-the-shelf part.
  10. Brian Malone

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

    I commonly use o-rings in regular (non-undercut) grooves without issues of ride-out/lift-up as long as the corner radii are not extremely tight.
  11. Brian Malone

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

    You are possibly over specifying on your design. An o-ring or any flexible seal is by definition: flexible - the actual final shape is going to vary unless measured in a constrained condition. Specifying +.001/-.000 on size dims is unrealistic for most fabrication processes for a...
  12. Brian Malone

    Air India 787 crashes on take off

    This video from Hoover (pilot debrief) touches on an idea  LittleInch posited back in posts #34 & 36, that the fuel cutoffs may have been inadvertently activated when attempting to adjust for a failing engine just at the V1 point.
  13. Brian Malone

    Guizhou bridge collapsed due to landslide

    This is old - sorry, thought it was new. Well, I think this is new . . . an earlier time/date stamp on the ShanghaiEye video had the year as 2024. It says 2025 now. https://www.yahoo.com/news/driver-truck-hangs-precariously-over-095848390.html
  14. Brian Malone

    Guizhou bridge collapsed due to landslide

    Crazy rescue of a semi truck driver on the approach of a bridge that collapsed in Guizho, China. Driver was quite fortunate the trailer wedged as it did and cab/trailer pin did not fail
  15. Brian Malone

    Elon's Roman Candles

    According to this story, SpaceX has completed in-orbit fuel transfer. The accomplishment got little attention. If the tools and techniques are solid, the in-orbit refueling is figured out. The logistics of getting tanker Statships positioned as required along the Earth-to-Mars path remains to...
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