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  1. twalter

    Radiative Emissions

    Side note on EMI issues, we tell our customers "test often, and test frequenty" as Ill often first here "We are at a test facility and failing.... ". Sigh. Quick Example... those darn little mag jacks (combined magnetic + RJ45 connectors) drive me nuts! There area some pretty good ones, but...
  2. twalter

    Mild steel or 4130 for a race car space frame ?

    tensor47 - O/A Welding 4130 is SOP for aircraft frames for experimental aircraft. You can get good repeatable results for home builders. For those welding day in, day out, TIG or MIG is fine. For occasional welding, stick with OA. One our fellow Bearhawk Builders took OA and TIG classes, and...
  3. twalter

    Boeing 737

    Anyone else have a habit of looking at the date codes on the aircraft as you board? I'll still fly on them, as Aloha Airlines Flight 243 showed just how much damage a 737 can withstand and still remain airborne. That was adhesive failure, if I remember correctly.
  4. twalter

    When did 2117 rivets first appear?

    swall. I found the A17S references and also pulled out some old handbooks... including a 1958 Alcoa book on riveting. Yes, it was in there. Just odd as my old Metallurgy Book didn't make any reference of it, so I started wondering when it first appeared.
  5. twalter

    Regan unicom. United ten-twelve downwind for runway one-niner

    Glad no fatalities involved. The issue about one controller in the tower came up after Lexington. http://www.msnbc.msn.com/id/14792433/ns/us_news-life/
  6. twalter

    When did 2117 rivets first appear?

    dgapilot - thank you. My Metallurgy Book is dated, and has the temperature vs phase diagrams of common aluminum alloys except 2117. Looking for the 2117 diagram for heat treating, I've got 2017 and 2024... but no luck in finding the one for 2117. Any pointers appreciated!
  7. twalter

    When did 2117 rivets first appear?

    My son is a ME at UTSA. We had a neat discussion about aluminum alloys and aging, and I pulled out my old Metallurgy Book from Cal Poly SLO. Well 2117 isn't even mentioned. His comment "wow, you really are old... " Darn kid! Flipped through some old books and seems 2117 rivets didn't appear...
  8. twalter

    Solid Rivet Installations - "Butt Driving"

    Can some point me to a "coupon test method" for rivets. Would be nice to confirm (shear/tension) mechanical properties on batches of rivets (i.e. AN4 washer, two sheets 0.100", another AN4 washer... then either pull for shear test, or form into a delta shape and pull to failure for tension...
  9. twalter

    Why Not Fuel Injected GA Aircraft

    As to older Cessna'a... 172N (1979) is carbed. The primer lock occasionally sticks and doesn't lock (uh why is the engine running rough, and I'm burning 15 gph?). No I would never do that! Old STC's were straight forward through the local FSDO Office, uh these days it is simpler and faster to...

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