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CR4 - Recent Forum Threads and Blog Entries

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

Published: Tue, 28 Mar 2017 18:00:00 EST

Copyright: Copyright 2017

Water Velocity Calc.

Tue, 28 Mar 2017 15:44:15 EST

How would I calculate the velocity in individual .5" circuits exiting a water manifold with a 2" line supplying the manifold that has a GPM of 160?

Sizing Inlets And Outlets For Manifolds Correctly

Tue, 28 Mar 2017 12:13:11 EST

I usually use the cross sectional area for the larger inlet and divide the smaller outlets to determine how many lines the larger hose can supply. Is this the correct way? Also, if i was to use a smaller inlet for more hoses how would i determine the pressure or flow rate loss?

347V in Canada Used For 3 Phase Or One Phase?

Tue, 28 Mar 2017 10:55:39 EST

We are a manufacturer of electronic ballast in China, recently got some inquiries of 347V ballast for Canadian greenhouse. Does anyone know this 347V ballast is going to run with 3 phase, 2 phase or 1 phase electricity? Thanks.

What is This Thing For?

Mon, 27 Mar 2017 17:49:56 EST

A friend found this and is wondering what it is...maybe some type of rope "holder"? Here's a shot with a quarter holding the "jaws" open. That's a spring on the shaft not threads.

What Is It?

Mon, 27 Mar 2017 14:25:39 EST

this should be quite easy for those that are paying attention today

Control of Three Pumps Using Ladder Logic

Mon, 27 Mar 2017 12:10:53 EST

Hi Guys, am currently doing a project consisting of the following 1. Three Pumps 2. Two Pressure Transmitter (PT1 and PT2) with dry contacts to control start and stop of pumps. Control Philosophy shall be as follows: Only one pump is required to run at normal conditions- Start and stop signal i

Utility Brackets

Mon, 27 Mar 2017 06:42:07 EST

I am tooling up to make utility mounting brackets but it is difficult to come up with a solution if you do not know the problem. I would appreciate any suggestions for brackets or problems you would like to see a solution for. These could include sweeping, rotating, positioning or searching mounti

Attention Race Fans/The Gold Chip Course

Mon, 27 Mar 2017 04:14:43 EST

This is pretty incredible when you stop to think about it. I'll have to read it again to see if I really read it. look out NASCAR Rules of the Grand Prix 1) General regulations The molecule-car of a registered team has at its disposal a runway prepared on a small portion of the (111) face of

Boiler Closed System or Open System

Sun, 26 Mar 2017 12:03:58 EST

Is boiler open system or closed system. please clarify

Motor Protection

Sun, 26 Mar 2017 12:01:21 EST

Please provide typical Calculation for thermal overload, Ke, Excess long start, Forbidden start in motor

Guess the Architecture! for 3/28/2017

Tue, 28 Mar 2017 18:00:00 EST

Do you recognize this one?

Does Alfa Romeo’s New Giulia Quadrifoglio Live Up to the Brand’s Performance Legacy?

Tue, 28 Mar 2017 13:00:00 EST

Alfa Romeo hasn’t offered a sedan in the U.S. market since 1995, the final year its 164 was sold on these shores. Though the brand has offered niche-market sports cars to American customers (on and off) since 2008, it’s been slow to market a mainstream vehicle on these shores. In the wor

More Natural Gas is Found in Eastern Med, Raising Hopes

Tue, 28 Mar 2017 04:00:00 EST

Eni expects the gas, from a recently discovered natural gas deposit in the Egyptian waters of the Mediterranean Sea, to start flowing by the end of 2017. The deposit could hold as much as 30 trillion cubic feet of gas, costing $12.8 billion to develop it fully. ------- Editor's Note: This news b

Dumbphones Are Making A Comeback (But Only In Japan)

Tue, 28 Mar 2017 04:00:00 EST

I’m not a fan of smartphones, to the point that I still don’t own one. I’ve blogged about it a bit. I’m called a Luddite, party-pooper, and worse. I can’t receive emojis, so I’ve grossly misinterpreted a few messages from my friends’ and family’s iPhon

Woman of the Week – Florence Bascom

Mon, 27 Mar 2017 20:30:00 EST

Apart from being one of the first females to master in Geology, Florence Bascom was known for her innovative findings in the field. She led a generation of notable female geologists and was the first woman hired by the United States Geological Survey. She was born in Williamstown, Massachusetts in

Building Blocks are Off-the-Wall

Mon, 27 Mar 2017 17:00:00 EST

When I was in architecture school, our professors routinely asked us what had brought us to architecture. Was it visiting Fallingwater as an impressionable infant? Was it a crazed ambition to become the next Gehry or Zaha? (Za-who?) Was it the instinctive wrongness of cookie-cutter office buildings?

A Hellcat of a Different Sort: Buick’s 1944 76-mm Gun Motor Carriage M18

Mon, 27 Mar 2017 15:48:00 EST

Today, the name “Hellcat” is associated with the supercharged variant of the fourth-generation Dodge Challenger, but 74 years ago it belonged to a very special Buick. Technically the “76-mm Gun Motor Carriage M18,” Buick’s Hellcat was built with a deadly purpose in mind

Anti-Aging Breakthrough

Mon, 27 Mar 2017 12:48:07 EST

I came across this article and thought it was interesting... - UNSW scientists unveil a giant leap for anti-aging - UNSW researchers have made a discovery that could lead to a revolutionary drug that actually reverses ageing, improves DNA repair and could even help NASA get its astronauts to Mars.

Is Europe Ready for the Smart Buildings Revolution?

Mon, 27 Mar 2017 04:00:00 EST

A report concludes that no EU member state is fully prepared to take advantage of the benefits that smart building technologies will bring, and most countries show little progress in opening the market to demand response, or in encouraging the penetration of energy storage capacity in buildings.

Sticking to Neural Tissue

Sun, 26 Mar 2017 04:00:00 EST

The ability to interface with neural tissues is enabling a new range of health interventions. Researchers have developed a method for effectively connecting electrodes to neural tissue. This opens the door for advances in pacemakers, deep brain stimulators for treating Parkinson's disease, cochlear