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General Discussion

13267 threads, 232851 comments (12 Viewing)

space plankton?

08/19/2014 by Fredski
hoax or bad science?
Views: 26, Comments: 3
Last comment 08/20/2014 by lyn

Big Nuclear Battery, Coming Soon.....?

08/19/2014 by SolarEagle
...." American business can still be creative and UPower Techologies thinks it may have a way to get nuclear energy going again without being block...
Views: 43, Comments: 6
Last comment 08/20/2014 by europium mkII

Older Tools: Do You Use Them?

08/19/2014 by old salt
Although time wise, The Cro-Magnon period was many years before us, how many of us practice the use of early tools in the workshop, garage or even at...
Pathfinder Tags: enjoy using old tools hand tools modern tools old tools
Views: 167, Comments: 39
Last comment 08/20/2014 by geraldpaxton

Electron Spin

08/19/2014 by Fredski
do they spin clockwise or counter clock? I don't really care I just wanted a thread that didn't trumpet gender
Views: 121, Comments: 19
Last comment 08/19/2014 by Relativity PL

Pastry Rounders & Ovens

08/18/2014 by mazhur
I am working on a pastry baking project but am stuck with the problem of finding a 'rounder' for rounding small portions, 120-150 gms , in round ' bal...
Views: 43, Comments: 7
Last comment 08/20/2014 by mazhur
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Commercial Space

1786 threads, 3273 comments (1 Viewing)

Baldor Air Compressor From China

08/18/2014 by elsaxiao
BALDOR air compressor is a brand from China. BALDOR air compressor is manufactured by Foshan Davos Power Technology Co., Ltd, which is specialized in...
Pathfinder Tags: baldor air compressor
Views: 25, Comments: 7
Last comment 08/19/2014 by lyn

The Cheesy Animation- Improving Your Office With New Mezzanine 3D Floor Plan Off

08/11/2014 by ishita
3D Floor Plan For House It is usually the case that the fundamental solid structure of the permanent walls and floors cannot be modified for variet...
Pathfinder Tags: 3D Floor Plan 3D Floor Plan For House 3D Home Floor Plan
Views: 25, Comments: 0

BSTFLEX fire sleeve

08/09/2014 by bstfiresleeve
500°F/260°C Continuous Exposure: Higher Intermittent Silicone coated fiberglass Fire Sleeve Silicone coated fiberglass Fire Sleeve is designed to pr...
Pathfinder Tags: fire sleeve
Views: 47, Comments: 2
Last comment 08/09/2014 by lyn

AC Input Laser Drivers

08/08/2014 by hyt532372289
This series laser drivers/controllers are designed for driving laser diodes with low noise current, 20A, 30A, 40A or 45A at high efficiency, > 76%....
Pathfinder Tags: laser driver
Views: 48, Comments: 0

Convert MBOX Files to NSF

08/08/2014 by savoie
MBOX files which are created by any email client, such as: Thunderbird, Entourage, Spicebird, Pocomail, AppleMail, Incredimail, ClawsMail, OperaMail,...
Pathfinder Tags: mbox to nsf pst to nsf
Views: 20, Comments: 1
Last comment 08/19/2014 by frankforbes
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CR4 Feedback

580 threads, 10395 comments (0 Viewing)

Voting, Deleting Good Answers

08/17/2014 by Alanvaderi
It is noticed that some great Pop has deleted few of my good answer by voting against it. May God bless him
Pathfinder Tags: good answer
Views: 101, Comments: 11
Last comment 08/19/2014 by europium mkII

Generator Tripping on Over Current

08/09/2014 by Faiz6555
when a 4.5MVA generator synchronized with grid, its loss its excitation and tripped on over current as loss of excitation protection was not installed...
Pathfinder Tags: "generator"
Views: 192, Comments: 11
Last comment 08/10/2014 by Andy Germany

Membership - Name Not Found in the Membership List

07/27/2014 by dhayanandhan
I am a Member in the CR4 from May 2008, from India. I have posted more than 1000 replies and 574 Updated discussions, and as on date, 25 Good Answers....
Views: 76, Comments: 9
Last comment 07/27/2014 by Tornado
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See all Blog Entries

Section Blogs

Caption This!

271 blog entries, 11742 comments (0 Viewing)

Caption This for 08/15/14

08/14/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to europium mkII for submitting this image.
Pathfinder Tags: camouflage Caption this couch engineering images funny images
Views: 536, Comments: 34
Last comment 08/18/2014 by europium mkII

Caption This for 08/08/14

08/08/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to europium mkII for submitting this image.
Pathfinder Tags: Caption this engineering images funny images trillion dollars zimbabwe
Views: 652, Comments: 46
Last comment 08/14/2014 by Rixter

Caption This for 08/01/14

07/31/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to Phys for submitting this image.
Pathfinder Tags: Caption this engineering images funny images
Views: 663, Comments: 31
Last comment 08/02/2014 by JIMRAT
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Physics In Film

7 blog entries, 67 comments (0 Viewing)

Medieval Physics - Bows & Arrows

08/12/2014 by cheme_wordsmithy
Of the many interesting events that take place in the summer, one of my favorites are Renaissance fairs. Seeing the participants in character and cost...
Views: 355, Comments: 15
Last comment 08/13/2014 by suresh sharma

The Skeleton of Mechatronics

11/16/2013 by CR4 Guest Author
- The Science of Entertainment - Time and technology have done a great deal to boost the entertainment value of movies. From black and white silent...
Pathfinder Tags: mechatronics
Views: 379, Comments: 4
Last comment 11/17/2013 by SolarEagle
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Challenge Questions

318 blog entries, 27258 comments (1 Viewing)

The Sprinkler Mystery: Newsletter Challenge (August 2014)

08/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: An old home's new sprinklers are scheduled to start up at 9 PM but do not. A tec...
Pathfinder Tags: challenge question
Views: 3327, Comments: 139
Last comment 08/19/2014 by JohnDG

Space Trail: Newsletter Challenge (July 2014)

06/30/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: The path that a spacecraft follows when traveling to the moon is a distorted fig...
Pathfinder Tags: challenge question
Views: 2648, Comments: 21
Last comment 08/10/2014 by WilhelmHKoen

Rolling, Rolling, Rolling...: Newsletter Challenge (June 2014)

06/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: Two cylinders of equal length and radius are set at the same height on a ramp an...
Pathfinder Tags: challenge questions
Views: 3795, Comments: 138
Last comment 07/06/2014 by europium mkII
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The Engineer's Notebook

324 blog entries, 5300 comments (0 Viewing)

Life is Random

07/30/2014 by HUSH
I'm sure that by now you've heard yet another Jurassic Park film will be released next year. This time around the dinosaurs run amok and eat people,...
Pathfinder Tags: dinosaur extinction life Mars
Views: 325, Comments: 14
Last comment 08/04/2014 by europium mkII

Build a Better Fourth

07/02/2014 by HUSH
I may or may not have mentioned this before, but the Fourth of July is awesome. It's an unusual holiday here in the U.S., as it's our only federal h...
Pathfinder Tags: fireworks holiday July 4
Views: 316, Comments: 0

The Internet of Things

06/29/2014 by Chelsey H
Interesting stuff on the internet Happy 4^th of July! Image Credit: JD Hancock Going away for the summer? Consider checking out the World's Larg...
Views: 306, Comments: 1
Last comment 06/29/2014 by Kilowatt0
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Notes & Lines

18 blog entries, 116 comments (0 Viewing)

Acoustic Guitar Tonewoods

07/26/2014 by cheme_wordsmithy
I remember the day I received my acoustic guitar, and played it for the first time. In the moment, it seemed produced the most beautiful sound I had e...
Views: 246, Comments: 14
Last comment 08/06/2014 by Holzfeller

For Love of the Index

05/09/2014 by Hannes
If you're a literate human who's a (diligent) knowledge worker or (diligent) student, chances are you've used an index this week. Or at least you di...
Pathfinder Tags: books index indexing
Views: 183, Comments: 0

Wait...What'd I Just Say?

03/27/2014 by Hannes
Several months ago, an acquaintance decided to try out a speech recognition software program to cure writer's block. He found it to be quite "inte...
Pathfinder Tags: ambiguity natural language processing nlp words
Views: 602, Comments: 8
Last comment 04/02/2014 by Calnet42
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TechnoTourist’s Engineering Expeditions

80 blog entries, 461 comments (0 Viewing)

Vacation Destinations for Engineers

07/17/2014 by SavvyExacta
What are your summer vacation plans? TechnoTourist has compiled a list of some destinations of engineering interest that have been featured on the b...
Views: 296, Comments: 11
Last comment 07/22/2014 by SavvyExacta

Castell de Bellver - Mallorca Spain's Circular Castle

11/02/2013 by SavvyExacta
Bellver Castle, or Castell de Bellver, is located in Palma de Mallorca and dates back to the 14^th century. This particular castle is unique because...
Views: 448, Comments: 0

Barcelona and the Influence of Antoni Gaudí' (Park Güell, Sagrada Familia)

10/11/2013 by SavvyExacta
My travels brought me to Spain a few weeks ago. Barcelona is a port city that was revived by hosting the 1992 Summer Olympic Games. But 100 years befo...
Pathfinder Tags: Gaudi Park Guell Sagrada Familia
Views: 393, Comments: 1
Last comment 10/11/2013 by PWSlack
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The CR4 Admin Blog

64 blog entries, 1028 comments (0 Viewing)

Why You May Have Fewer Posts & GAs

07/08/2014 by SavvyExacta
The team has been cleaning up CR4 a little bit. Your post and good answer totals may be lower because posts and comments from deleted threads are no l...
Views: 398, Comments: 26
Last comment 07/15/2014 by Kris

Posting Timeouts--Fixed?!

02/13/2014 As far as I can tell, the reason for the timeouts experienced by users trying to post to CR4 has been fixed. (Don't know what I'm talking about? Click...
Views: 418, Comments: 24
Last comment 02/20/2014 by adreasler

1,000,000th CR4 Comment Posted

02/10/2014 Since 2004, CR4 has been a community for people interested in engineering, science, and technology to converse and share ideas. On February 10, 2014...
Views: 603, Comments: 39
Last comment 02/24/2014 by tcmtech
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Defense & Security Technology

75 blog entries, 1158 comments (0 Viewing)

Sea Drone is Solar Powered

07/03/2014 by IHS GlobalSpec eNewsletter
Eco Marine Power's Aquarius USV (unmanned surface vessel) will be a trimaran covered with "marine grade" solar cells to charge its Li-ion batter...
Views: 279, Comments: 7
Last comment 07/08/2014 by europium mkII

Engineers Save the World--June 6, 1944

06/04/2014 by HUSH
Friday marks the 70^th anniversary of D-Day, June 6, 1944. It would be thoughtless to not mention the bravery of the American (and British and Canad...
Pathfinder Tags: D-Day June 5 military engineering WWII
Views: 463, Comments: 4
Last comment 06/05/2014 by passingtongreen

KAI Touts Aerospace Systems at Singapore Show

03/21/2014 by IHS GlobalSpec eNewsletter
The recent Singapore Airshow saw Korea Aerospace Industries marketing diverse military aerospace products. Most interesting was the Devil Killer small...
Views: 328, Comments: 0
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Animal Science

210 blog entries, 1914 comments (0 Viewing)

Ways to Care for Your Aging Cat

06/16/2014 by SwissMiss
One of my most cherished memories is the day I adopted my first cat. My younger self was delighted to have a new friend, and as we grew together ove...
Views: 422, Comments: 8
Last comment 06/20/2014 by SwissMiss

Jeepers, Creepers... a Different Kind of Peepers!

05/01/2014 by SavvyExacta
The birds are singing, the grass is greening, and the peepers are peeping. Spring has finally sprung here in upstate New York after a long, long win...
Pathfinder Tags: ANIMAL SCIENCE frogs hibernation peepers
Views: 378, Comments: 5
Last comment 05/02/2014 by lyn

Would You Do Anything for Love? Cardinals Will!

02/14/2014 by SavvyExacta
As you enjoy your morning coffee you gaze out the window and watch the birds at the feeder. But what's going on in the distance - is something attac...
Pathfinder Tags: bird behavior
Views: 592, Comments: 6
Last comment 02/19/2014 by Doggoneit
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The Standard

1 blog entries, 3 comments (0 Viewing)

Safety News:The Helmet Debate in Girls Lacrosse

06/12/2014 by KevinCassidy
Recently, the Florida High School Athletic Association (FHSAA) voted to require the use of helmets by high school girls lacrosse players in Florida st...
Pathfinder Tags: ANSI ASTM Head Protection helmet Lacrosse ...
Views: 164, Comments: 3
Last comment 06/17/2014 by phoenix911
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WoW Blog (Woman of the Week)

159 blog entries, 452 comments (0 Viewing)

Women Redefining Leadership in STEM and IT

05/10/2014 by Chelsey H
As of 2014, there is still a lack of female representation in science, technology, engineering, and mathematics. Women hold just about 32 percent of...
Views: 265, Comments: 3
Last comment 05/11/2014 by europium mkII

Top 10 Women Engineers and Scientists

10/18/2013 by CR4 Guest Author
Many women have made great contributions to science and engineering. Check out the list of the 10 below and read their biographies. Then, let us know:...
Views: 584, Comments: 8
Last comment 11/20/2013 by Tornado
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Roger's Equations

88 blog entries, 1117 comments (0 Viewing)

Why LiFi? by Roger Pink

05/08/2014 by Roger Pink
The Coming Data Crunch Everywhere you look nowadays, the world is becoming more mobile. Smart phone...
Views: 374, Comments: 2
Last comment 05/09/2014 by Rixter

New Dwarf Planet And Other Solar System News by Roger Pink

03/26/2014 by Roger Pink
- New Dwarf Planet Discovered - Astronomers have increased the size of the observable solar system after spotting a 450-km wide object orbiting the...
Views: 429, Comments: 7
Last comment 05/01/2014 by europium mkII

Oceans by Roger Pink

03/20/2014 by Roger Pink
The Great Unknown...Right Next To Us Although oceans and other bodies of water cover 70% of the Earth's surface, we are only just now beginning...
Views: 392, Comments: 6
Last comment 03/21/2014 by SolarEagle
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60 blog entries, 498 comments (0 Viewing)

Dangerous Drilling - Oil & Gas Rig Safety

03/06/2014 by cheme_wordsmithy
Crude oil and natural gas have over the last hundred plus years become critical to our way of life and economy. Not only do they satisfy a huge chun...
Views: 383, Comments: 2
Last comment 03/06/2014 by texasron

Titanic Sank Over A Century Ago, But The Story Lives On - 5 Possible Reasons Why Is It So Interesting Even Today!

10/13/2013 by CR4 Guest Author
On April 10, 1912, Titanic, the virtually unsinkable ship, embarked on its maiden voyage to never return again. It hit an iceberg deep in the night...
Views: 611, Comments: 27
Last comment 10/15/2013 by Yusef1
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What Is It?

60 blog entries, 1628 comments (0 Viewing)

What Is It? for 2/28/2014

02/28/2014 What is this stuff?
Views: 751, Comments: 30
Last comment 03/18/2014 by RufusVS

What Is It? for 2/22/2014

02/22/2014 What is this item? Two views are shown. Share your guesses below!
Pathfinder Tags: What is it?
Views: 898, Comments: 71
Last comment 03/02/2014 by Andy Germany

What Is It? for 2/15/2014

02/15/2014 What is this? Bonus points if you can guess where it is, too!
Pathfinder Tags: What is it?
Views: 779, Comments: 19
Last comment 03/06/2014 by steven phaneuf
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Great Engineers & Scientists

144 blog entries, 498 comments (0 Viewing)

U.S. Presidents Who Were Engineers

02/16/2014 by SavvyExacta
Monday is Presidents' Day in the USA. In honor of Washington and all other presidents we will take a look at those who contributed something to engi...
Views: 633, Comments: 18
Last comment 02/21/2014 by suresh sharma

Top 10 Greatest Engineers

09/20/2013 by CR4 Guest Author
Who are the greatest engineers of all time? Here's a list of 10. Click on the links to see their biographies. Then tell us: who's on your top 10 list?...
Views: 946, Comments: 36
Last comment 09/30/2013 by passingtongreen
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"On This Day" In Engineering History

232 blog entries, 817 comments (0 Viewing)

October 31, 1941 – The Completion of Mount Rushmore

10/31/2013 by cheme_wordsmithy
One of the fondest memories I have from my "Out West" trip 6 years ago was arriving at the Mount Rushmore National Memorial in South Dakota. Though I...
Pathfinder Tags: monuments Mount Rushmore October 31
Views: 713, Comments: 6
Last comment 11/02/2013 by ronseto
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Other Blog Entries of Interest

Slo' Mo' Hat Cam

07/04/2014 posted in Workbench Creations
by Del the cat
I wanted to see how my arrows were flying from my bow, specifically flight arrows. A flight arrow presents a conundrum, you'd think you would want...
Views: 607, Comments: 67
Last comment 07/15/2014 by europium mkII

The Poisson Distribution by Roger Pink

02/26/2014 posted in Derivations
by Roger Pink
The Poisson distribution, named for Simeon Denis Poisson, is a discrete probability distribution that expresses the probability of a given number...
Views: 314, Comments: 0

Whistling Walnut!

12/28/2013 posted in Workbench Creations
by Del the cat
What to do with the walnut shells left over from Christmas? Make a whistling arrow . I'd been toying with the idea for ages, and if you try an...
Views: 706, Comments: 33
Last comment 01/02/2014 by artsmith

Detective Work On An Exploded Warbow

07/11/2013 posted in Workbench Creations
by Del the cat
It's often impossible to actually work out how and why a bow explodes. But this time I think I know! I was building a copy of a Mary Rose Warb...
Views: 822, Comments: 13
Last comment 07/14/2013 by lyn

Del's Lathe Refurb' pt 3

06/20/2013 posted in Workbench Creations
by Del the cat
I've done the back gears, I could have bought new gears, but I thought I'd 'make do and mend'. I replaced the small cog with a slightly larger one...
Views: 593, Comments: 16
Last comment 06/22/2013 by Del the cat

The One-way Speed of Light Controversy

06/13/2013 posted in Relativity and Cosmology
by Jorrie
The very title of this post may surprise and/or offend some relativistically minded readers. I will try to give a reason for this possible reaction,...
Pathfinder Tags: relativity speed of light
Views: 1016, Comments: 15
Last comment 06/18/2013 by Jorrie