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CR4 - Recent Forum Threads and Blog Entries

Recent content from CR4, The Engineer's Place for News and Discussion

Published: Sat, 18 Nov 2017 12:47:27 EST

Copyright: Copyright 2017

Wind/Solar Combined

Sat, 18 Nov 2017 12:47:27 EST

Would it make economical sense to put solar cells on wind both sides of some turbine blades? With the storage and conversion equipment already installed,it would seem like a wind-win (pardon the pun) situation. I realize it would not be as efficient as a ground based tracking solar farm applicatio

B16.5 Flange Thickness Deviation

Sat, 18 Nov 2017 06:48:15 EST

Hi All, Is there any possibilities to accept the flange thickness which is deviated from standard ASME B16.5 ? else anything has mentioned in the standard itself to accept the deviation... i have read, but i couldn't found anything like that... if not, Do we have any alternate calculation to accep

Robotic Toys for Anyone

Fri, 17 Nov 2017 21:41:41 EST

I'm particularly drawn to the one made from a soda can.

A Microengineering Miracle

Fri, 17 Nov 2017 20:37:57 EST

I'm a big fan of Great Stuff foam. One thing I always hated about it was that the foam would cure in the straw/can, so if I didn't have enough gaps to fill with one can I'd almost always have to throw it out. I bought a can this past summer, and lo and behold this problem is no more. Dow now includ

Differences Between Engineers and Scientists

Fri, 17 Nov 2017 14:07:27 EST

My interpretation of the difference (blurry at best) between an engineer and scientist is that an engineer applies scientific principles to solve real-life problems. In my office we have people with science degrees and an engineering job title, so I'm not sure if it matters too much.

Jumping Jack the Robot

Fri, 17 Nov 2017 13:27:56 EST

Boston Dynamics strikes again!!! Now this guy is extraordinary! Not only that, but he is not perfect in his acrobatics, since he does not "stick" every landing as you will see in the video. I put this in aerospace, since he does go airborne.

Magnets and Expanding Universe

Fri, 17 Nov 2017 10:29:01 EST

I have always been fascinated by magnets,and the forces they are capable of.I have a few around all the time,and I was playing with a couple;a small one,and a larger one. When placed in opposing polarities,of course they repelled,but only at a certain distance.When held closer,they attracted each o

The Amazing Tesla Semi Truck

Fri, 17 Nov 2017 07:54:20 EST

Plant Availability Factor in Thermal Power Station

Fri, 17 Nov 2017 05:16:39 EST


MHD in Air

Thu, 16 Nov 2017 21:41:16 EST

Basic question: Is ionization of air possible to sufficient extent with Tesla coils, etc. to produce a conductive low temperature plasma that can be induced to flow by the use of a non-stationary magnetic field. Suppose this ionized gas will be in a large tube (but not too large?), and coils are af

Cutting Wait Times for Restaurants with Google

Sat, 18 Nov 2017 05:00:00 EST

The geniuses at Google are doing life-saving work. Hear me out. Thanks to them, those of us impatiently loitering around the hostess stands at our favorite restaurants — desperately hoping that those seated will quickly shovel through their meals so that we can be seated — will no long

Caption This for 11/17/2017

Fri, 17 Nov 2017 21:45:00 EST

Here's this week's image: Be sure to vote for your favorite! Thanks Nigh for the submission. And remember, more submissions are always welcome!

AACA Museum’s Latest Exhibit Celebrates “Getting the Job Done: Vehicles that Earned Their Keep”

Thu, 16 Nov 2017 14:00:00 EST

Without commercial vehicles, modern life would grind to a halt rather abruptly. Despite their importance, these workhorses are rarely embraced by collectors, and the likelihood of a 1913 Ford Model T C-cab or 1938 Autocar tanker truck taking Best of Show at Pebble Beach lies directly between “

Say It Isn't So! Greek Theater Acoustics Aren't Perfect

Wed, 15 Nov 2017 14:55:49 EST

Have you ever heard that Greek theaters, at least some of them, had such perfect acoustics that the audience could hear a word whispered from the orchestra all the way up in what we might now call the cheap seats? I’d read this claim. When our tour coordinator offered an excursion to Epidaurus

SEMA Feature Cars, 2017: The Show Within a Show

Wed, 15 Nov 2017 14:00:00 EST

Though it’s been held annually since 1967, the SEMA Convention was not always a haven for specially designed and built show cars. Even after coming to Las Vegas in 1977, custom display cars were sparse. But the last decade or so has seen an explosion of show cars, particularly since the areas

Guess the Architecture for 11/14/2017

Tue, 14 Nov 2017 19:00:00 EST

Do you recognize this week's building? Care to take a guess?

Japanese Celebrate 35 Years of Manufacturing in the U.S.

Tue, 14 Nov 2017 14:00:00 EST

There was a time when buying an import, particularly a Japanese import, was seen as an affront to American workers. But since the early 1980s, Japanese automakers have become a significant force in American manufacturing, each year employing more and more Americans not only on the factory floor, but

Woman of the Week – Danielle Dy Buncio

Mon, 13 Nov 2017 21:30:00 EST

Danielle Dy Buncio is the co-founder and CEO of VIATechnik, a construction and engineering services firm working to make the construction industry better. The company works through virtual design and construction by blending global human capital with construction technologies. Dy Buncio leads the c

Texas Begins Revoking Titles for Dune Buggies, Sand Rails, and Other Kit Cars

Mon, 13 Nov 2017 17:00:00 EST

While Texas state officials claim to be looking into the matter, the state’s DMV has outlawed any rebodied vehicles and has started to revoke titles and registrations for dune buggies in the state, a move that has provoked Texan kit car enthusiasts to start lobbying the state to re-legalize th

Laser Engraved Gift Guide 2017

Sun, 12 Nov 2017 05:00:00 EST

The holidays are upon us, which means racking the brain for the perfect gift for that special someone. Sure, you can join the crowds and shop ‘til you drop, but why bother when you can add a personal touch to an ordinary object for the ultimate holiday gift. If you have a laser engraver, then