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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.

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 ?

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

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...

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...

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...

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...

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

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...

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...

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...

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...

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.

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 ?

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...

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...

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...

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 ?

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

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...