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I was reviewing the manual for a Chinese VFD and was surprised to see that it could be used to control a single phase motor from a single or 3-phase source. It shows U, V, W output with W connected to the capacitor lead after the capacitor is removed. What do you guys think of that? Page 6 of...

This is a very well made video comparing the currently available liquid rocket engines and explaining their operation. 49 minutes. https://www.youtube.com/watch?v=LbH1ZDImaI8

https://reason.com/2020/03/02/oregon-tried-to-silence-this-engineers-red-light-camera-research-now-experts-say-he-was-right-all-along/

I just came across this YouTube video explaining this effect. I learned something new and found it fascinating. You may too. It is 15 minutes long. https://www.youtube.com/watch?v=1VPfZ_XzisU

This video popped up after one that I searched for. I found it fascinating. I can watch videos like this all day.

Here is an interesting alternative option for dealing with climate change. https://mises.org/wire/what-if-climate-warriors-put-their-money-where-their-mouths-are

https://www.youtube.com/watch?v=oYhCQv5tNsQ A colleague just told me about this documentary that was originally shown on BBC in 2007. I found it very interesting, and still relevant and not dated. I do not care to argue the subject myself as there are many people more eloquent, and with more...

I just watched a one-hour Nova (PBS) program titled "Secrets of the Forbidden City". I found a 3-minute video synopsis that includes all the good bits that a structural engineer will enjoy, including earthquake testing of a sub-scale structure. https://www.youtube.com/watch?v=w78Yb_aotH0

I just read a fascinating article on learning to fly antique aircraft. The author refers to the method of starting the engine by hand-cranking the prop as an "Armstrong starter". I learned a few things. The last half is a little more interesting...

I'm not a woman, and this topic is not of great interest to me, but this blog was quite interesting: http://www.ecnmag.com/blogs/2015/06/why-girls-arent-taking-engineering-classes?et_cid=4617690&et_rid=45570172&type=cta

I found this article quite interesting. I hope this link works for everyone...

A link to this lecture at Berkeley was posted in the HVAC forum. I found it very interesting and think that many in this group will also. http://www.youtube.com/watch?v=rkfAcWpOYAA

I came across this auction of an antique 20 kw Edison DC generator. There are a number of pictures that I think this group will find very interesting. http://www.govdeals.com/index.cfm?fa=Main.Item&itemid=1659&acctid=767

I have an application where we make 90 degree bends, 1" bend radius, in 5/16" O.D. aluminum tubing with 0.035" wall. The alloy is 6061-T6. We make several thousand parts per year. These are not for fluid flow but a non-critical structural application. I've been getting tubing through...

I just read an interesting article about gear crowning, a practice of which I was not previously aware. http://www.pddnet.com/blog-fred-young-cheap-fix-for-noise-reduction-and-misalignment-problems-012710/?wnnvz=1750,01285302538 How common is this practice? It must reduce the gear's load...

SAMPE Memphis is next week and tomorrow is the last day to register on-line. It occured to me that I can't remembr SAMPE being mentioned much, if at all in this forum. You can find out more about the conference and register here: http://sampe.org/events/2008Memphis.aspx. Admission to the...

I came across this great reference. It is chapter one of "The Mechanics of Pneumatic Tires". Judging from chapter one, the book is a good reference if you are interested in the subgect. http://media.wiley.com/product_data/excerpt/19/04713546/0471354619.pdf

Several questions have come-up on this topic and there seemed to be a fair amount of interest. Here is a link to a good review article on the subject. http://www.compositesworld.com/hpc/issues/2006/July/1366/1