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  1. MOHR1951

    AN3 hole tolerance question

    No one has yet to reply to my earlier post.Perhaps my answer lies in the comments made,and speak for themselves.But tell me anyway,my kit money is burning a hole in my pocket.
  2. MOHR1951

    AN3 hole tolerance question

    Just out of curosity,and I am considering a kit build,who may I ask,without prejudice either way is the manufacture of the kit ?
  3. MOHR1951

    Book to learn Vortex Methods from.

    I'll have to check this one out,hadn't run across it before,Vortex Methods and Vortex Motion.
  4. MOHR1951

    Book to learn Vortex Methods from.

    Yeah,well may be not a true layperson."Div,Grad,Curl and all that",by H.M.Schey,published in '73.I didn't find the book til much latter,after Calculus 3.We were forced to wade thru vector cal at Thomas,this was the chosen text at the time,cause the guy's at MIT used it,but that didn't mean that...
  5. MOHR1951

    Book to learn Vortex Methods from.

    Don't know if my earlier reading suggestions were any help to you.When reviewing something else,ran across an even better,short summary of Vortex Methods.It's short,to the point and practical.It's dated,"Aircraft Structures", by David J. Perry,the original edition.See pages; 213 thru...
  6. MOHR1951

    What causes this pattern in stretch formed Aluminum skins?

    I have seen and noticed this before,also.When I first saw it,I to thought it to be some form of corrosion,too.But as you point out,no other signs of corrosion exist.It has to be associated with the conditions it's exposed to while in service,possibly a combination of heat or temperature changes...
  7. MOHR1951

    Questions about 'reference stress'

    Another example of sloppy terminology.Design work grasps all of it's roots from strength of materials and basic structural analysis,they are the heart of the matter,without them we would have people running around "designing" stuff based on their feelings or what they felt was pleasing,a...
  8. MOHR1951

    Weight increase in turning

    College physis course problems often called this "apparent weight",another common example being elevator problems.
  9. MOHR1951

    Questions about 'reference stress'

    So,rb1957,the conditions you point out in your #2,set certain conditions on it.So,reference stress is really a misnomer.to say the least.I just checked my three favorite strength of materials text books,none even mention reference stress,by name,the most generic or preferred name appears to be...
  10. MOHR1951

    Questions about 'reference stress'

    Have never recalled the term "reference stress",in all the literature I have read."Nominal stress" is by far the most commonly accepted term,and as SWC points out,this is simply the far field stress,with no stress concentration,at work.It took me a long time as a student to grasp what "nominal...
  11. MOHR1951

    Book to learn Vortex Methods from.

    Try : Aerodynamics for Engineering Students,by Houghton,Carpenter,Collicott,and Valentine.Elsevier,Sixth Ed.. Starting around page 270,it's one of the clearest explanations I have found.It starts off with the basics and takes you into intermediate level,it keeps stuff simple,and lots of...
  12. MOHR1951

    Prying (Heel-Toe) Calculations

    We've lulled our way into thinking that if we don't have CAD,FEM.and all the other software that it can't be designed safely,or efficiently.Recall before we used standard engineering procedures,calculations,and healthy safety factors and for the most part it all worked out,we designed...
  13. MOHR1951

    Prying (Heel-Toe) Calculations

    rb1957,is it correct to simply vector sum offsets ? What rule or logic do you use or refer to? It sounds like a perfectly legitimate thing to do,but I don't recall being able to make this assumption,let alone being taught such practices.
  14. MOHR1951

    Bending of a pipe slotted within a pipe

    SparWeb,would really like to see or know of the footnotes for 43.13,just to see what the federal agency considered right or relevant at the time.Where do you think I should search for them ?
  15. MOHR1951

    Bending of a pipe slotted within a pipe

    This problem,or question may seem very theoretical to many.In fact it's been around in aircraft tubular structural repairs for decades,I for one ,like perhaps many others on this blog maybe never thought of it's importance or ramifications.FAA 43.13 is filled with circular aircraft fuselage...
  16. MOHR1951

    which is the Best Course For Fatigue and Damage Tolerance learning?

    Chapter 6,of C.T.Sun's,Mechanics of Aircraft Structures may be of interest to you. I should add,that both the book by Sun is most interesting,and Paris deserves much credit for his research,both of these texts are more theoretical in nature,the practical applications are not given,that's left up...
  17. MOHR1951

    which is the Best Course For Fatigue and Damage Tolerance learning?

    This subject you learn alittle about by looking at cracks,and tears,then go read Sam's book and others then go look at some more cracks,low and behold all you thought you knew has been disproved.A subject that' really hard to draw conclusions about.Interesting from a theoretical point of...
  18. MOHR1951

    Need Opinion on Stress Analysis Procedure for Interior Monument Honeycomb Laminates

    So,just treat the material as a homogeneous item,no difference in materials,yes,that sure makes things simple from a strength of materials stand point.But is it safe to make such simplifications ?
  19. MOHR1951

    Need Opinion on Stress Analysis Procedure for Interior Monument Honeycomb Laminates

    Brian,will you pls. let me know when your text becomes available.It may give me a better feel for this idea of smeared stress,thanks in advance. george_hobbs@msn.com
  20. MOHR1951

    Need Opinion on Stress Analysis Procedure for Interior Monument Honeycomb Laminates

    Have checked for the term "smeared stress",in the two texts on composite design I have,and all of my structural analysis design texts ,I have related to airframes,nobody even speaks this language.Who came up with or coined this and when ? We need to all be on the same wave length to communicate...

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