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CR4 - Recent Forum Threads and Blog Entries

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

Published: Wed, 26 Oct 2016 04:47:41 EST

Copyright: Copyright 2016

End of an Era

Wed, 26 Oct 2016 04:47:41 EST

Bob Hoover, Aviation Icon Whose Aerobatic Stunts Thrilled the World, Dies at 94 Nobody flew like him! RIP

Is...Is Microsoft Actually Good Now?

Wed, 26 Oct 2016 00:59:40 EST

I entered college in the early nineties and have spent much of my adult life criticizing Microsoft. However, since Satya Nadella took over as CEO, I've increasingly noticed a disturbing pattern where I'm pleasantly surprised by Microsoft products. For instance, I pay 10 dollars a month for Office 3

High Def Video Underwater

Tue, 25 Oct 2016 13:34:49 EST

I remember reading about a method of sending Hi-Def video underwater,wirelessly, using a new form of sonar signal generator. The sonar signal generator used a laser to generate the high frequency signal,which could not be produced by previous transducer technology. I seem to remember a super-heate

Do Planes Really Need a Tail?

Tue, 25 Oct 2016 12:32:11 EST

maybe they could just fold their wings like a bird in flight.

Your Experiences of PD On-site Measurement for MV Cables?

Tue, 25 Oct 2016 12:27:17 EST

Hi fellows, Do you have practical experiences of measuring Partial Discharges from medium voltage cables(6-35 kV), using inductive high frequency current transformer sensors over the cable groundings at the end of cable? In environmentals like powerplants, industrial etc. where the noise level can

Steam Turbine Rotor Lift Measurement

Tue, 25 Oct 2016 04:31:03 EST

How can we calculate rotor lift of a steam turbine via jacking oil pump?

Motor with One Moving Part Powers Ballbot

Mon, 24 Oct 2016 15:32:03 EST

Interesting advance in robot propulsion: Spherical Induction Motor (SIM) eliminates mechanical drive systems.

Is Windows 7 Intentionally Difficult To Update?

Mon, 24 Oct 2016 15:07:27 EST

I recently upgraded the motherboard CPU and hard drive in an old computer. Basically this was a new computer with the exception of the case and power supply. I have tried windows 10 but I still prefer windows 7, also I had the disk and key that had been on the computer before. Installing windows 7

Pressure Drop Correlations of Non-Newtonian Two-Phase Flow in the Pipeline

Sun, 23 Oct 2016 22:00:19 EST

Hi, Can anyone guide me to have good correlations or equations to measure the pressure drop of non-newtonian two-phase flow in the pipeline? Thanks

Newtonian Pressure Drop vs Non-Newtonian Pressure Drop

Sun, 23 Oct 2016 21:57:21 EST

Hi, I did some experiments on Newtonian and non-Newtonian fluids measuring the pressure drop through a horizontal pipeline. The Newtonian two-phase flow was water+air and the non-Newtonian was (water+xanthan gum)+air. I prepared 2 samples (2 concentrations) of the xanthan gum solution 1g/1L (995

What’s the Shelf Life of Rubber Gaskets?

Tue, 25 Oct 2016 20:55:00 EST

Does your company keep rubber gaskets in inventory for long periods of time? Buying and storing large quantities of gaskets can help to reduce unit costs, but rubber doesn’t last forever. Shelf life, the storage period prior to gasket installation, varies by material type. Temperature, humidit

France Will Ban Plastic Cutlery in 2020

Tue, 25 Oct 2016 17:34:06 EST

For the past several years, an all-out war has been silently waged between two opposing factions here at CR4 HQ: those who support the supply of plastic cutlery in the office and those who do not. Both sides have pretty valid points. The Pros enjoy the flexibility of walking into the break room and

Selling a Collection of “Papa’s Toys”

Tue, 25 Oct 2016 13:00:00 EST

It all started with cars. The local hot rod club met in the back yard of Susan’s family. She mostly stayed inside – she was the “little sister” and wasn’t part of the group. But she noticed John, and even while in grade school she knew that someday John would be The Guy

Unfit Fitbits

Tue, 25 Oct 2016 04:00:00 EST

So…they were probably too good to be true. Recent reports have come out showing that fitness trackers may not be making you more fit. A study published in the Journal of the American Medical Association showed that people who did not use fitness trackers lost an average of five pounds more o

Sound Transmission Class (STC) and Acoustic Insulation

Mon, 24 Oct 2016 20:55:00 EST

Sound transmission class (STC) describes the ability of a product or material to stop the transmission of airborne sound. Since the 1960s, STC ratings have been used to describe the acoustical properties of ceilings, walls, floors, and doors. Today, STC values are provided for acoustic insulation ma

The World’s Best-Known ’76 AMC Pacer Sets Auction Record in Las Vegas

Mon, 24 Oct 2016 16:00:00 EST

According to the latest value guides, a 1976 AMC Pacer in excellent overall condition (but falling short of concours-quality) should be worth in the neighborhood of $6,000, but when that Pacer is the original Mirthmobile, driven by Wayne Campbell and Garth Algar (actually, Mike Myers and Dana Carvey

Reproductive Harm Seen in Bisphenol S

Mon, 24 Oct 2016 04:00:00 EST

Bisphenol S, or BPS, a chemical compound found in household plastics and food packaging, could be just as harmful to the reproductive system as Bisphenol A, or BPA, the chemical it was intended to replace, according to a study by UCLA researchers. In fertility tests on common laboratory roundworms,

Engineering Professions in Top 20 of 2016 Jobs Rated Report

Sun, 23 Oct 2016 04:00:00 EST

Did you know that Information Technology & Engineering are two of the most lucrative sectors for job seekers in a buyer's market? IT & Engineering withstood the job-market impact the Great Recession brought to other industries. The competitive wage potential, high growth outlooks and sheer

Power from Dam Conversions

Sun, 23 Oct 2016 04:00:00 EST

With U.S. engineers seeking out new, cost-effective ways to produce clean and sustainable energy sources, some are looking no further than the country's 80,000 dams. According to Engineering360, only about 10% of these dams are currently producing hydroelectricity. Yet a recent report conducted by t

Lasers + Food = Fun

Sun, 23 Oct 2016 04:00:00 EST

Sometimes you need a laser to etch/engrave tools, parts or other electronic components. Sometimes you need to use a laser to cut out gears, gaskets or other pieces for prototypes. And sometimes you need to laser something, well, just because you can. Like we did last year around Thanksgiving. So it