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Recent content by be2

  1. be2

    ANC-18 plywood buckling constraints

    Hi and thanks for all the replies: I have most of the referenced documents but was happy to hear of some new. The "small" problem remains now to be sure that my calculations are actually correct, that I can do by comparing with test data from the various reports. I made a check against the...
  2. be2

    ANC-18 plywood buckling constraints

    Hi Sparweb, the big K and the small k have nothing to do with each other. I found out by googling a lot that the definition of K is hidden in reference 2(50)of ANC-18. That is NACA TM 705 and also Forest Products Laboratory "mimeograph"(= report...) no 1316. I was lucky to find a download on...
  3. be2

    ANC-18 plywood buckling constraints

    Hi, I have a question regarding buckling of plywood panels. I need help with interpreting ANC-18 (1951 issue), Chapter 2.7, figures 2-24 to 2-29 and Formulas 2:72 to 2:77. For the calculation of buckling constants "Hc" or Hs" (compression or shear),there are plots of the different buckling...
  4. be2

    Help on Stress Analysis Distance Learning Course

    Hi lupin, the course follows the book without any extra info. You get home assignments. They consist of solving the problem at the end of each chapter and you also get a problem sheet sent home to you. Some of the problems are real easy but some required a lot of brain activity. Some questions...
  5. be2

    Stiff plate on elastic supports

    Hi Terio, thanks a lot for your comments, very interesting that there is a similarity with assymetrical beam bending, never thought about that. Yes,if it is an axial force that created some of the moments the direct contribution from it will be divided equally on all bolts, just as in shear...
  6. be2

    Help on Stress Analysis Distance Learning Course

    Hi, I took the course 2 years ago and have had some very good use of it in my work as a general stress engineer. I don´t have any aircraft stress engineering background and work for a train brake company. I have some years of general design experience as a consultant. I do both hand and FEM...
  7. be2

    Stiff plate on elastic supports

    Hi again.. I am checking my formulas now. I found that the force on one bolt is a constant times its x-distance to the cg plus another constant times the y-distance (sign conventions important). To find the constants you have to solve a simple two-row equation system involving the sum of the...
  8. be2

    Stiff plate on elastic supports

    I´m trying to develop some simple equations for the resulting axial bolt loads for a STIFF plate on elastic supports(=bolts). Question is: Are there any ready made such equations? I looked up my books and the internet but found only really advanced analytical treatments for elastic plates on...
  9. be2

    Maneuvering Speed and Weight

    All of this has been more or less considered in the past. For Normal category airplanes (g allowable is about 3,8 and even if a lightly loaded normal category plane can take more gs it aint ordinarily supposed to be flown any harder. So, for simplicity allowable g´s are stated only for Max...
  10. be2

    Maneuvering Speed and Weight

    I fly the Pa 28 from time to time. The maneuvering speed on this plane is lower for a lightly loaded condition. A lightly loaded Pa28 is a little livlier than with full load.It has to do both with the lower weight and the cg position.The cg on a Pa28 is usually further back when heavy...
  11. be2

    Official AN bolt material and strength specification

    Thanks, I need all he luck I can get.I try to keep it as simple and cheap as possible, and I will keep radiuses gentle and large so I won´t have to stress releive the fitings.
  12. be2

    Official AN bolt material and strength specification

    Hi,Wil, thanks for Your comments. I have the Mil-hdk 5-J, AC 43-13 and a number of fairly up to date hardware specifikations that I recently downloaded . It´s very nice that someone takes the inconvenience to diskuss the analyze of a bolt fitting. I work as a consultant mechanical design...
  13. be2

    Official AN bolt material and strength specification

    Thanks a lot all of You, I think I can live with the old standards, I already printed and saved most of what I need them. Its amazing what good advice there is, if one only asks for it.
  14. be2

    Official AN bolt material and strength specification

    Hi, I´m a mechanical engineer with some knowledge in airplane design. I have a pilots license and have been involved in some airplane design on an EAA-basis. I am now designing a light biplane two-seater and I´m currently collecting all the necessary material strength data. My main question...
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