Crazy Engineers .CoM: November 2011

Tuesday, November 29, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Posted: 29 Nov 2011 11:33 AM PST

So far I know Gears provide better power transmisssion capabilities and there is no belt slip is with belt drives.
What are some more pros and cons.
High Torgue and moisture and long production runs is the type of operating environment.
Which should i use?

Alternative fuels for the internal combustion engine?

Posted: 29 Nov 2011 08:34 AM PST

So I have transplanted a 2003 hyundai 2.7L v6 and 4speed auto transaxle into the back of a 1939 plymouth touring. Running gasoline is just far too passe. Ive debated running propane. Building a custom tank for under the hood, but again, thats too common. Alcohol is a possibillity, but still overly done. Perhaps a hydrogen/oxygen engine?

What are your thoughts?

CrazyEngineers Forum - Other Engineering Trades

Have a ball with this flying Sphere!

Posted: 29 Nov 2011 07:33 AM PST

Japanese Defense Ministry shows world's first spherical flying machine

Aeronuttical engineering going Crazy.

Monday, November 28, 2011

CrazyEngineers Forum - Other Engineering Trades

Ekranoplan - Wing-in-ground Effect plane!

Posted: 27 Nov 2011 10:35 PM PST

Back to the future with the strangest flying machine

Sunday, November 27, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Rack and Pinion Tooth Design

Posted: 26 Nov 2011 07:25 PM PST

Hey everyone, I found this forum while trying to do some research on rack and pinion tooth design. I'm having trouble getting my teeth to match up and I'm hoping I can get some help. My only concern at the moment is making the teeth match so that I can create a 3D model. I was attempting to get dimensions for the addendum and dedendum as well as the tooth thickness based on my pitch circle radius (1 inch), a certain number of teeth (arbitrary for now) and a pressure angle of 20 degrees. If someone could please help me out with finding formulas for my tooth geometry based on the dimensions I have, I would really appreciate it. Also, if you are aware of any useful resources that may help me out, please send them my way.

Thanks.

Saturday, November 26, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

China: The train that never stops at a station.

Posted: 25 Nov 2011 09:00 PM PST

This was posted by kevinm in CR4 forum:

http://www.wimp.com/chinatrain/#

CR4 - Thread: The China Train that Doesn't Stop

Friday, November 25, 2011

CrazyEngineers Forum - Other Engineering Trades

Rain Water Harvesting - Transforming Nicaragua

Posted: 25 Nov 2011 04:16 AM PST

BBC News - How rainwater harvesting is helping Nicaraguan farmers

Tuesday, November 22, 2011

CrazyEngineers Forum - Chemical & Metallurgy Engineering

World's Lightest Material @ 0.9 mg/cc!

Posted: 22 Nov 2011 12:07 AM PST

US scientists stake a claim for the world's lightest material

Thursday, November 17, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Bearing Capacity in interference fit with compression and shear loads
Bonneville Speed Demon @ 462 MPH!!
Shot Peen Hardness With Nanoindentation

Bearing Capacity in interference fit with compression and shear loads

Posted: 16 Nov 2011 11:08 PM PST

I need to give a seminar on bearing capacity in interference fit with compression and shear loads. I am working on it. Can somebody help me get related Information..

Thankyou all.

Bonneville Speed Demon @ 462 MPH!!

Posted: 16 Nov 2011 10:33 PM PST

Quote:Watch the Speed Demon make a 462 mph pass at Bonneville from many different angles in and around the car. Awesome! endquote

What Does 462 MPH Feel Like? - Autoholics

Shot Peen Hardness With Nanoindentation

Posted: 16 Nov 2011 08:59 PM PST

The intention of shot peening is ultimately to alter the mechanical properties of a given surface. By hitting the surface with controlled shot the surface will deform plastically. Two of the more common techniques include cast sheet shot and cut wire shot. Cut wire shot is created by cutting drawn steel wire to lengths approximately the same size as the width of the wire. The resulting wire is then rounded to remove the sharp edges. Cast steel shot is created by atomizing molten steel, then heat treating and sieving the resulting material. In both cases, the surface of the material is hit with a controlled energy of shot to create the desired effect. Understanding the mechanical properties of the surface reactions created by these techniques is becoming increasingly important in various applications including medical, aerospace and automotive industries. Proper Instrumentation will play a vital factor in achieving reliable and intended results.

APPLICATION NOTE: http://www.nanovea.com/Application%20Notes/shotpeen-nanoindentation.pdf

Wednesday, November 16, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

project ideas

Posted: 16 Nov 2011 03:14 PM PST

:)can some one please tell me any good projects on incompressible flows and the application of finite element method in fluid mechanics?

Pedal-Powered (Vacuum) Zeolite Refrigerator

Posted: 15 Nov 2011 10:08 PM PST

This project seem very interesting
Pedal-Powered (Vacuum) Zeolite Refrigerator - YouTube
any tried it before ? i was just wondering if i can replace the Zeolite to just simple silica gel where i can get it easily .

Tuesday, November 15, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Strength of Material question

Posted: 15 Nov 2011 02:32 AM PST

Hi all,

I found following two questions in a book; the solutions has confused me. Pleas help with the correct approach:

1.a steel rod 20 mm dia is passed through a brass tube of 25mm internal dia and 30 mm external dia. the tube is 80 cm long and is closed by thin rigid washers and fastened by nuts, screwed to the rod. the nuts are tightened until the compressive force in the tube is 5kN. cal the stresses in the rod and tube.

Es = 200 GPa; Eb= 80 GPa

2. a steel bolt of 16 mm dia passes centrally through a copper tube of internal dia 20 mm and external dia 30 mm. the length of the whole assembly is 500 mm. after tight fitting of the assembly, the nut is overtightened by quarter of a turn. what are the stresses induced in the nut and the bolt if pitch of nut is 2mm.

Es = 200 GPa ; Ec = 120 GPa

the key difference in the approach according to the book is that, for the first problem the elongation in rod and compression in tube is taken to be same.however for the second problem,the degree of elongation and compression is not taken equal. is approach correct for the second qtn ?

Requesting an urgent response!

Regards!!

CrazyEngineers Forum - Other Engineering Trades

No more huffin' and puffin' in gridlocked traffic - Just fly on your personal Puffin

Posted: 15 Nov 2011 07:30 AM PST

NASA - The Puffin: A Passion for Personal Flight

Return of the Airship - Multibody Advanced Airship for Transport (MAAT)

Posted: 14 Nov 2011 10:13 PM PST

Airships are poised (They can poise literally unlike airplanes) to come back. If all goes well. Air transport can see a radical change to the advantage of the environment.

High society: a new airship paradigm | In-depth | The Engineer

Monday, November 14, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

What sensors can measure the horizontal and vertical speed of a ball

Posted: 14 Nov 2011 11:38 AM PST

Basically I am trying to develop a system which would allow me to measure the vertical and horizontal speeds of a table tennis ball. I am planning to interface this system with a controller that would move a hydraulic. So far my research has shown that speed can be found using triangulation in a vision system, however this way requires complicated programming. As a mechanical engineering student I am looking to solve this problem without going to far out of my area. I am wondering if any one knows of any speed sensors I could use.

Sunday, November 13, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Revolutionary Spli Cycle Engine

Posted: 12 Nov 2011 11:16 PM PST

A Revolutionary Split-Cycle Design | Scuderi Engine

reducing the rotor noise in helicopters

Posted: 12 Nov 2011 09:50 PM PST

It is seen that the noise in helicopters is mainly due to the formation of vortices formed by the blade tips. when the vortex formed by a blade is hit by a succeeding blade, noise is produced. to eliminate this noise or to reduce this noise a lot of modifications to the design of the rotor blades have been made. but if we can remove the chance of the blade coming in contact with the vortex by offsetting the blades, i believe that the noise level can be considerably reduced. thus we will have a shaft where the blades are fixed one below. there will only be one blade per plane. the unbalance in masses can be taken care of by adding correcting masses on the other side.

Saturday, November 12, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

What kind of turbine will be efficient?

Posted: 12 Nov 2011 07:29 AM PST

While comparing impulse and reaction turbine, which one will be efficient if gas is used as input energy? and which one will be efficient if liquid is used as input energy? and why?

CrazyEngineers Forum - Other Engineering Trades

Thorium & Clean Energy: Can Is Provide Sustainable Clean Energy?

Posted: 11 Nov 2011 06:24 PM PST

We've been relying on the fossil fuels for a long time now and it seems that most of the world's problem - economical & health-related seems to be a direct or indirect consequence of our over-dependence on them. We've had discussions on this forum about possible uses of Geo-thermal energy and now there's a video that's making rounds: Motherboard TV: The Thorium Dream | Motherboard which talks about how Thorium can power world's power. Well, the current technology can allow us to create power from Thorium without creating pollution and radio-active wastes. I think everyone knows this.

I'm wondering about the technical difficulties which are hindering the adoption of Thorium for production of energy. Can anyone shed some light?

Thursday, November 10, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

How to solve the "last mile" problem in traffic

Posted: 10 Nov 2011 02:17 AM PST

I am currently working on an innovation research project on how to solve the so called "last mile" issue in traffic at the Vienna University of Business and Economics. The "last mile" issue is the fact that it's often difficult and inconvenient to get from the public transport station to your home or office without using a private car.

I'd really like to hear your opinion about the topic. What could be a good solution? Do you know a person who is very active in that field and maybe has already developed some technical solutions or interesting concepts?

I'm looking forward to your replies.

Thanks and best wishes from Vienna!
Lukas

Engineering Project: Looking for a Gearbox

Posted: 09 Nov 2011 07:30 PM PST

Hello,

I am currently working on a project and I am having issues finding a gearbox for my engineering project. I have searched several sources like eBay and I have not found any gearbox or lack the knowledge of gearbox technology to find the right one.

I was looking for a gearbox that can have the following specification:

-run's on no power at all
-1:80 --> 1:100 ratio

Thanks!

Tuesday, November 8, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Help with making a robot
Nuclear engineer at EDF gives career advice to Engineering students
Boeing 747 Super Structures Construction -

Help with making a robot

Posted: 08 Nov 2011 02:43 PM PST

I am a complete novice when it comes to making a robot, and there is a robot wars competition in my school i want to take part in.i want to use an old rc car as something to build the robot on.the car has no wheels whatsoever. Can someone please suggest of a way to make the car into a battlebot?and how do i attach the wheels to the car?also if i intend to attach something to the car for offence/defence will the car be able to run smoothly without a problem with the same battery?

Nuclear engineer at EDF gives career advice to Engineering students

Posted: 08 Nov 2011 08:51 AM PST

Hi guys,

it's been a while since I've been on here. However we just got a story on EngineeringBecause.com that some of you might really like. We recently interviewed Adedeji King for our site.

Adedeji is a Mechanical engineering graduate from UCL. He now works at EDF as a nuclear engineer. He's also had fantastic internships at companies like Exxon Mobil and BP. He's shared with us some of his experiences and given you guys some free advice regarding how to approach companies like EDF for jobs.

Let me know what you all think!

Kind regards,

Shaf

Note: The Big K has authorised us put links to our stories on this site.

Boeing 747 Super Structures Construction -

Posted: 08 Nov 2011 05:25 AM PST

The Boeing 747, sometimes nicknamed the "Jumbo Jet" is among the world's most recognizable aircraft and was the first wide-body commercial airliner ever produced.

Manufactured by Boeing's Commercial Airplane unit in the United States, the original version of the 747 was two and a half times the size of the Boeing 707, one of the common large commercial aircraft of the 1960s.

The aircraft's wingspan is actually longer than the length of the Wright Brothers' first flight. First flown commercially in 1970, it held the passenger capacity record for 37 years, until it was surpassed by the Airbus A380.

Monday, November 7, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Antonov 225 (An-225 Mriya) Construction : Antonov Design Bureau - Super Structures!

Posted: 06 Nov 2011 11:40 PM PST

The An-225 Mriya is a strategic airlift transport aircraft which was built by the Antonov Design Bureau, and is the largest flying airplane ever built. The design, built to transport the Buran orbiter, was an enlargement of the successful An-124 Ruslan. Mriya (Мрія) means "Dream" (Inspiration) in Ukrainian. Two An-225s have been produced.

The Antonov An-225 is commercially available for flying any over-sized payload due to the unique size of its cargo deck. Currently there is only one aircraft operating but a second mothballed airframe is being reconditioned and is scheduled for completion around late 2008.

See how the engineers & designers 'mech' things up -

CrazyEngineers Forum - Chemical & Metallurgy Engineering

Chemical Contrails (ChemTrails) Evidence Covered By Discovery Channel

Posted: 07 Nov 2011 12:00 AM PST

Quoting from the Discovery Website-

Quote:

Across the planet, millions of people have seen them - jet aircraft vapor trails lingering in the sky. Are these just regular "contrails" - the carbon and water vapor exhaust from commercial planes - or are they potentially toxic "chemical trails" emitted intentionally as part of secret geo-engineering experiments or weather-weaponization tests?

Experts and passionate observers on both sides present their best evidence - from video and photographs, satellite imagery, soil samples and military evidence. We shed light on a subject that has many people looking up for answers to disturbing questions.

A team of technicians at an independent laboratory will examine the samples to finally get to the heart of the question: What is in those fuel emissions and what causes them to linger for hours and link up with one another like a ghostly blanket that seems to affect the weather and perhaps our health?"

The one hour "Chemical Contrails" episode, first aired 22 February 2007 appeared to be a compromise of some sort - perhaps the pro-chemtrail side was too convincing and the government types and "scientists" were coming off poorly because in the version aired an excess of screen time was devoted to a rather meaningless laboratory testing of commercial jet fuel that appeared to this viewer to be extended to fill where something earlier had been edited out.

Why would the producer or director not have seen this content imbalance - but who knows what went on?

But, nevertheless, it is a breakthrough that such a program be aired at all in the mainstream media.

The general consensus is that the best thing about the program was it exposed the issue to a wider audience of people who might otherwise not know anything about chemtrails but have questioned all of the strange plumes that they have been seeing in our skies for the last number of years.