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  • Users: 737eng
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  1. 737eng

    Question on the definition of Limit Load and service life

    I know that Limit Load is the maximum load anticipated on the aircraft or component during its service life. My question is what is the definition of service life and how it relates to limit load. I was taught that a limit load is only to occur once in the life of a fleet (i.e. 1 aircraft out...
  2. 737eng

    Huth Formula for Fastener Flexibility

    I asked this in another forum as well. But I thought a discussion on different methods of determining fastener flexibility may begin here. I have been using Tate and Rosenfeld and recently read the paper by Huth and felt that since his formula was determining lower compliance that the...
  3. 737eng

    Fastener Torque vs Tensile Load

    I am looking for a reference that translates Fastener torque to tensile load in the fastener. I believe there is a mil-std or something, but I searched on-line and could not find anything. Something that is a mil-spec or that I can validate is preferred.
  4. 737eng

    Aging Aircraft and WFD Issue

    With the release of the WFD NPRM and the ongoing Aging Aircraft Issue there is going to be a requirement on STC holders to accomplish a WFD assesment in a relatively short amount of time. It is my feeling that for most STC holders and Engineering Firms this is going to a monumental task that...
  5. 737eng

    Material allowables for altered sheet thickness

    In the aircraft world, we commonly "reverse" engineer using ultimate material properties found in Mil-Hdbk, MMPDS, or equivalent source. Which allowable do you use if a part is made by altering a sheet thickness. Example a 0.090" thk 2024-T3 sheet is chem-milled down to 0.050" thk in order to...
  6. 737eng

    Fuselage Skin Repairs and Drag

    This post is similar to one that I posted in the Aircraft Engineering forum, however, in this post I am only concerned with the drag issue, not the structural integrity and durability. I have been working as a Liaison Engineer in the airline world for a good while. I always knew that adding...
  7. 737eng

    Fuselage Skin Repairs and Drag

    I have been working as a Liaison Engineer in the airline world for a good while. I always knew that adding external "scab" patches to the fuselage induced drag (I believe it is called Excrescence Drag) and this drag would effect the overall fuel burn of the aircraft. However, due to time...
  8. 737eng

    Good General Aerodynamics Book

    I am a Structures Engineer, who hasn't dealt with calculating aerodynamic loads (lift and drag) in a long time (since college, and I either sold back my text book or I borrowed it for the classes, I believe it was by Anderson). These aero loads were always provided to me and I utilized them to...

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