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  1. johnSchwaner

    Unloading a torque wrench - spring weakening.

    It has been the common recommendation to return a snap style torque wrench to its lowest setting after usage. The often given reason is that the spring, if left compressed, will weaken. I have always questioned the reason (not the practice). Will the spring weaken (creep) under sustained...
  2. johnSchwaner

    "True Negative Drag" in bicycle wheel brochure - possible?

    Interesting in a aerodynamic expert opinion of the term. A $3,000 bicycle wheel brochure advertises "true negative drag". "using the most difficult wind tunnel testing protocol". Possibly these wheels don't require that I install pedals as the bike will accelerate on its own. But seriously...
  3. johnSchwaner

    what is an "impedance type" bolt

    I received an Engineering drawing for a helicopter part titled "Bolt, Self Retaining Impedance Type, Alloy Steel and CRES, 95 ksi." Anyone know what impedance type means?
  4. johnSchwaner

    Rivet Shear Strength Question from A&P Course

    Hello, While studying sheet metal repairs in the Aviation Maintenance Airframe Study Series I found the following statement that I question? "The rivet size and material must be chosen so that the shear strength of the rivet is slightly less than the bearing strength of the sheets of material...
  5. johnSchwaner

    Monel Safety Wire - where used

    Where would one use Monel safety wire? I'm familiar with stainless steel and inconel but the spec for safety wire - MS20995 also includes safety wire made from monel. Can't find anyone who has ever used it.
  6. johnSchwaner

    copper crush gasket torque

    Is 500-510 lb.-ft torque on a 1-3/4 -16 brass plug using a copper crush gasket excessive? This torque is listed in an aircraft engine Table of Limits and seems very high. Another engine manufacturer shows 130 degrees rotation for a comparative item. I thought that one didn't want to totally...
  7. johnSchwaner

    Proper O'ring Straight Thread Boss SAE J514 vs. MS33649

    Is there any difference in the boss o'ring used for a straight thread boss SAEJ514 and a MS3649 (formerly AND10050)? While I'm asking - what is the difference between a SAEJ514 and MS3649?
  8. johnSchwaner

    efs-2500 paint stripper removed anodize coating -safe?

    An aircraft hose we made with blue anodized aluminum fittings had the anodizing removed to bare aluminum wherever efs-2500 paint stripper splashed onto it. This "envirnomently friendly" paint stripper is advertised as safe on aluminum and is being used on many aircraft. If it's removes...

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