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CR4 - Recent Forum Threads and Blog Entries

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

Published: Fri, 20 Apr 2018 02:02:17 EST

Copyright: Copyright 2018

Home Weather station batteries

Fri, 20 Apr 2018 02:02:17 EST

My home (Acu.Rite) weather station has been going through batteries faster than I like. It is difficult change due to location. I think it takes 4 AA. Their website is full of similar complaints. This unit comes with a solar panel built in. It doesn't even power the unit in sunny days. Has anyone

Materials Question: Shoes for Playing Organ

Thu, 19 Apr 2018 19:04:56 EST

I work as a professional organist on the weekends. Organists wear shoes with short heels and a special sole covering designed to provide just enough grip that the shoes don't slip off the wood pedals, but also enough slide so a player can switch from toe to heel on the same pedal without lifting it.

SpaceX Just Recovered its 24th Falcon 9 First Stage

Thu, 19 Apr 2018 12:30:26 EST

Yesterday SpaceX deployed NASA's Tess into high earth orbit and recovered the first stage of the Falcon 9 that launched it. That was the 8th launch this year for SpaceX (one of which was a Falcon Heavy launch). SpaceX is averaging a launch every two weeks. To put that in context, that is how many la

How Does An Optical Projector Show Black?

Thu, 19 Apr 2018 02:59:39 EST

After many years of watching various presentations, it dawned on me that I really don't understand how projectors work. I recently sat through a slide show that had saturated black in the images. It was much darker than the edges of the screen that had no projected light striking it. I had never th

Canonical Basis Vector and Some Other Issues

Wed, 18 Apr 2018 23:29:25 EST

Please see the attached image. FYI: A1 = A2 means that smallest and largest eigenvalues of (V*)'(V) are equal, where V = [v1| v1*| v2| v2*| v3| v3*]. Do you guys think that the last sentence(~ centered tightly around 1) is correct? around "1" ?!?! [Coding & Results]==========================

Can Tesla Survive?

Wed, 18 Apr 2018 08:37:50 EST

Many of you will understand the financials and the feasibility of Tesla. Others will see the stress on Elon's face (and the obvious lack of sleep) and know something isn't "right". Still others are believers in the company and technology, so they will believe Tesla has a future. I'd like to know wh


Wed, 18 Apr 2018 05:41:52 EST

Hi. Need help here. I'm quite confused here about module and ECU.Under BCM, we should add ECU or not? Example, lighting ECU, Door ECU,etc.. Or, we already control all of that through BCM and just need to use driver only?

Roof Cooling

Wed, 18 Apr 2018 00:46:57 EST

Good evening, I am looking for information regarding designing a solar shield evaporative roof cooling system for a warehouse. Any information is welcome.

An Unanticipated Lapse in IoT Security

Tue, 17 Apr 2018 19:38:43 EST

I did a little research on IoT security for a recent article. Let's say that the scales fell from my eyes at the [lack of] security, in part because companies don't realize how many entry points the crooks can find. This article tells the story of a perfect example. How many of you work for organiz

Simple Location for Engineers to Find a Job

Tue, 17 Apr 2018 18:54:14 EST

I found a place where only jobs for Engineers is listed. Its called I was looking for a Mechanical Engineering Manager job in Washington and found three. This site is easy to navigate and very simple. I hate cluttered sites that have tons of ads.

Zora Duntov’s “Stealth Fighter” Corvettes featured at The Revs Institute

Thu, 19 Apr 2018 13:00:00 EST

A racer himself, Zora Arkus-Duntov – the “Godfather of the Corvette” – understood the value of creating purpose-built racing cars instead of modifying production cars for competition. Twice, Duntov stood ready to launch specially prepared racing Corvettes, but both attempts w

Guess the Architecture for 4/17/2018

Tue, 17 Apr 2018 18:00:00 EST

Can you guess this week's building?

Selections from Carroll Shelby’s Personal Car Collection Head to Auction in Greenwich

Tue, 17 Apr 2018 13:00:00 EST

Carroll Shelby was a man of many interests, and, given his background as a racer and car constructor, it stands to reason that he was a car collector as well. On June 3, a selection of 23 cars from Shelby’s own garage – representing his collaborative work with Ford, Dodge, and even GM &n

The True Costs of Industrial Rubber Products

Mon, 16 Apr 2018 22:06:08 EST

What are the true costs of industrial rubber products such as seals, gaskets, and insulation? Buying rubber materials and fabricating them in-house may seem cost-effective, but is your company really saving money? For that matter, are you sacrificing quality, consistency, and potential sales opportu

Woman of the Week – Gertrude Jekyll

Mon, 16 Apr 2018 20:30:00 EST

Gertrude Jekyll was a British horticulturist, writer, garden designer and artist from London, England. She designed and created over 400 gardens in the UK, Europe and United States and wrote hundreds of articles on the topic. She was born to a family that valued the arts and fostering a creative s

Prancing Moose Creator Sent Cease and Desist Letter by Volvo

Mon, 16 Apr 2018 14:30:00 EST

A cheeky homage to Volvo’s sometimes staid reputation may soon become a thing of the past now that Volvo has sent a cease and desist letter to the creator of the prancing moose logo over his use of the Swedish company’s trademark on restoration parts. As Dave Barton shared on his site,

Authors Offer Advice for Treating Potentially Life-Threatening Snake Bites

Sat, 14 Apr 2018 04:00:00 EST

When you consider how cold this spring has been so far here in the northeast, it’s difficult to imagine that we will one day be spending time outside again (well, not me. I’ll be at Target). After such a long period spent indoors, we might have forgotten some rules critical to exploring

Caption This for 4/13/2018

Fri, 13 Apr 2018 20:45:00 EST

Here's this week's image: Thanks to Kilowatt0 for the submission.

Hot Rod Stovebolts and Other Chevrolet Six-Cylinder Memories

Thu, 12 Apr 2018 13:00:00 EST

It was the ultimate “sleeper.” No one suspected the car was fast. Only 17 and feeling my oats, I drove the old Chevy like a maniac and enjoyed surprising V-8 drivers at stoplights. Shifting into first and revving the 235-cubic-inch, 135-horsepower “stovebolt” six, I’d

This or That – Season 2: 1970 Buick Electra 225 or 1970 Chrysler 300

Wed, 11 Apr 2018 13:00:00 EST

Editor’s note: This or That is not a comparison report between two vehicles, but rather a feature that enables us, in an idyllic world, to add a collectible vehicle into our dream garage on a regular basis, but with a catch: We can only pick one vehicle from this pairing, and it has to be for