INTRODUCTION: In a review of the first 100 pages of Mr. Limpert's book I found what I believe to be many numerical errors, and many more nit-picky editorial things. An e-mail to SAE noting that there were errors in the book drew a response asking for more detailed information. A detailed letter sent in January '97 has gone unanswered as of June 1997. Copies of the book purchased as recently as December '96 were not accompanied by any type of errata sheet. I have included here the numerical and algebraic problems, as their dissemination is the most critical, in my opinion. Locating the nitpicky-editorial stuff is left (more-or-less) as an exercise for the reader. Commentary on my commentary is welcome, and will be incorporated into this document as I deem appropriate. My comments will be identified by the text's numbered section and the page to which they apply. Suggested changes and comments will be listed to the right.
3/98 UPDATE: A second letter to SAE (in March, 1998) drew a response! They are working on the next edition, and "are very concerned with the accuracy of our products". I hope they follow through.
4/98 UPDATE: SAE has forwarded a draft manuscript to me of the second edition for technical review. I am working on it as we speak, and will keep this page updated on the results.
11/98 UPDATE: Several months ago, SAE received from me a complete review of the book. There were numerical problems throughout, as well as my editorial differences with Mr. Limpert. The 30-odd page document is too lengthy to transcribe into HTML at this time, but may happen sometime in the future. As a little thank-you, SAE sent me a coupon good for materials at the SAE bookstore!
3/99 UPDATE: SAE is still selling the old version at its website for the full price. They should be ashamed of themselves.
JAN 2000 UPDATE SAE released the second edition of this book, and sent me a gratis copy late last year. Thanks guys! Some of my suggestions were used word-for-word. It is very odd seeing my writing under someone else's byline. Most (and perhaps all) of the numerical problems and some of the variable-related problems have been resolved. I have not undertaken a comprehensive review of the new edition of the book but I scanned some of the areas I originally flagged as troublesome. There is a bunch of material in the book which just isn't necessary (how many of us civilians need to have info on the design of brakes for 40-ton tracked-vehicles taking up space on our shelves?), some material which is still very manufacturer-specific (omitting references to competing products and design), some material which is unsubstantiated and fairly apocryphal (with regard to problems experienced by particular manufacturers), and some coefficients which were revised dramatically (by factors of 100 or more) without any source reference or explanation (which does NOT give me confidence enough to actually use them). Nonetheless, the second edition is an improvement over the first. That's probably all I will have to say on the matter. If you use the first edition, please be very careful with the numbers it uses!!!
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This page created on 17-APR-1997 and last modified 17-JAN-2000