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  1. sigmatau

    Cadmium Plated AN4 Bolts vs CRES AN4C Bolts

    If you look at the spec, all steel bolts are the same strengh. Yes on the subs. Jim Brown, DER Structures www.faader.us
  2. sigmatau

    Why learn to design aircraft ?

    One thing in your job hunt, is don't send your resume to HR. Find out who the manager is in the area you want to work, and send it to him and/or his boss. Much better response rate. Jim Brown, DER Structures www.faader.us
  3. sigmatau

    Adding 1.15 to margin of safety for repairs.

    No confusion, if you're using calculated allowables, the 1.15 factor is to be included, otherwise you're using test data. Unless a larger special factor is being used (25.619). Specical factors are in 25.621-25.625. Jim Brown, DER Structures www.faader.us
  4. sigmatau

    FtuX1.5

    inertia4u is correct... it is simple factor for determining the plastic bending factor for a rectangle... you can find several references for it. Buhn is one of them. And yes, some explaination is needed in the analysis. The FAA doesn't tell you how to do the analysis. They are concerned...
  5. sigmatau

    What Ever Happened to RAPIDC?

    No, I tried it, but it took too long to setup the repair each time. Faster to do the DT by Avgrow.
  6. sigmatau

    What Ever Happened to RAPIDC?

    No, you don't have to go to Boeing or Airbus for the DT. In any case the DT usually isn't approved for about a year... you can always ask them to provide it. It takes a bit to do the DT. You can run the numbers just as easy as they or anyone else can for static. Your MRO doesn't have a DER or...
  7. sigmatau

    Limit Loads & SCFs vs Ultimate Loads

    What advisory circular dicusses SCF's?
  8. sigmatau

    What Ever Happened to RAPIDC?

    Dan, A couple of things... In working for an MRO, if you hardly have time to draw up the repair, how do you have time to run Rapid? I've found it to very time consuming to use. You don't have to go to Boeing or Airbus for approvals, some DER's can approve them also. In my experience...
  9. sigmatau

    AC43.13-1B Table 4-9,4-10 (# req'd rivets) inconsistancies

    Single lap joint doesn't mean a single row of rivets, it means one lap.
  10. sigmatau

    DAR structure book

    This company can approve your report www.faader.us Sigmatau
  11. sigmatau

    Aircraft repair

    Did you get your crack problem fixed?
  12. sigmatau

    Warbirds and the FAA

    I am an FAA DER for structures, and can approve the data for structural repairs and modifications. You need a form 337 to approve an airplane for return to service after a "major" alteration or repair. The FSDO or an IA can sign the 337. See www.aviation-engineer.com for more info. Sigmatau
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