Lockheed Stress Memo 88
Lockheed Stress Memo 88
(OP)
Hello,
I need the Lockheed Stress Memo 88. Where can I find this document in pdf? I tried at emule but it is quite dificult to find.
Does anyone have a hint?
Thanks a lot!
I need the Lockheed Stress Memo 88. Where can I find this document in pdf? I tried at emule but it is quite dificult to find.
Does anyone have a hint?
Thanks a lot!





RE: Lockheed Stress Memo 88
All of what I have has come from back-channel personal contacts. You may want to call in a few markers to see if anybody has what you want. I don't believe you'll find anybody willing to cough up SM 88 in a public forum.
RE: Lockheed Stress Memo 88
I've already found it!
The complete Lockheed Stress Memo Manual!!!
Guess where?
eMule!!!
I finished dowloading it yesterday after almost 1 week with my computer on (24 hours per day).
RE: Lockheed Stress Memo 88
Just curious, what is the date on that?
Glad you found it. I have to admit, I've never used eMule until today. There are few things I've been trying to add to my library but have yet to find. Perhaps eMule will yield some results!!!
RE: Lockheed Stress Memo 88
Does downloading a document for personal use constitute breach of copyright in the US? I would think that the people who made the document available via e-mule are guilty of breach of copyright, although because of the fragmented nature of the process (usually with multiple providers of different bits of the document) it's far from clear cut. If it's an ancient document from the '50s then that's one thing, but if it's the company's up to date manual...
RE: Lockheed Stress Memo 88
An old friend of mine, who worked for many years as Head of Methods at a large airframer in the Dallas area, once told me that every US aircraft company has a copy of their competitor's structures manuals. Where there were gaps in their own manual, the competitor's data were included and a few "confirmation tests" done to verify the "foreign" method. Thus you'll find a very large amount of uniformity among stress manuals emanating from US companies.
Differences do appear in SM material and fastener allowables however, where very often different suppliers are able to achieve statistically better results than those published in the public domain literature like the MMPDS. Similar materials (e.g. 2024) are given additional identifiers relating them to the supplier.
Much of this work has also found its way across the pond to Europe, with some sloppy disguise work done, in particular, on commercial aircraft fatigue analysis methods.
In particular the L-SM 88 method under discussion here, on Tension Fittings, has found its way into European manuals, then migrated to Ireland and has finally wound up back in Canada, with the European "tweaks" still evident in the fine-print. At least the European company did some substantial mathematical and FE analysis work on the empirical methods to confirm their validity. They have their own internal substantiating reports to back-up their use of the original.
Most of today's manuals still rely on the ground-breaking work done by the NACA researchers before during and after WW2. The works of Kuhn and Gerard et al are enshrined in each one.
Besides the inter-company "flow" of manuals, ex-company SM authors have shared their company methods and test results with us in the form of public domain books and supplements that are now widely used by stress engineers around the globe.
IMHO, the L-M lawyers would have an extremely tough time convincing a jury that they were the sole owners of the text contained in L-SM 88. But who knows, in order to turn a buck, maybe they'll try anyway.
RE: Lockheed Stress Memo 88
15 DECEMBER 1955
REVISED JUNE 1988
REVISED NOVEMBER 1992
REVISED APRIL 1995
That's it.
There is no problem at all obtaining a stress manual. Summarizing what edbgtr said, the information is spreaded away....everybody uses available information.
RE: Lockheed Stress Memo 88
You will find the LSM 88a in it.
It's already a public information.