Engineering

I'm working on a little project that involve hydraulics piston. I need an oil/fluid that is, 1. Density => water 2. Slippery 3. Non reactive 4. Easy to find 5. Cheap

hey i just one know if it is possible to make a motor of the size of the foot or even more smaller with the power of a motor of a car

Turbofans work by burning jet fuel to spin turbines, ultimately powering the massive fan you see in the front of the engine. Could you substitute the jet fuel with liquid hydrogen and, in theory, make a jet plane that produces no CO2

Are man made satellites called satellite before they are in orbit ...

Hi all, Im inventing a new product and need some advice as to what material i should use to create part of it. The goal is for it to be a clear material, thats heat resistant (wont bend or misshape) when a lit cigarette is touching it. Basically i just need to figure out what cheapest compound can be used as an ash tray almost. If i need to provide clearer instructions as to my request, just ask. Thanks!

Hi all. What to expect from electroplating a 'target' metal with two (or more) different 'donor' electrodes cyclically switched on for few seconds ? I do not have the equipment to experiment. Example... an iron 'target' electrode getting electrodeposition from both submerged copper and tin electrodes in the same vessel but only one timely connected (powered) at a time... With proper timing; would the iron be electroplated with bronze ? Or... several 'donors' creating a complex alloyed surface for corrosion/hardness/properties improvements ? Does such a practice exist in the industry ?

Hello you all! Astronauts going to Mars shall be protected from radiations. Since exotic shields look inconvenient now, and unless this one brings the necessary improvement http://www.scienceforums.net/topic/80982-shield-astronauts/ Nasa seeks to accelerate the manned transfers between both planets, something really hard with chemical propulsion. My Solar thermal engine enables that. http://www.scienceforums.net/topic/76627-solar-thermal-rocket/ For my Solar thermal engine, I use here Isp=1267s computed by tinkering Propep. The heavy mission uses D=10m concentrators to let each engine push 5.3N near Mars and if possible 12.4N near Earth - the launcher's fairing must acc…

Hello hitchhikers and tinkerers! Nasa wants now short trips to and from Mars for a manned mission to minimize the radiation dose on the crew since some shields have shown impractical. Also, I had wanted to lower the trip's perihelion to stay shortly on Mars, but with short leg durations, this looks compromised even with the Isp=1267s of my Solar thermal engine http://www.scienceforums.net/topic/76627-solar-thermal-rocket/ So here's my spreadsheet that estimates travel times and speed increments, without nearing to the Sun between the planets - this v5 lets orient the departure from the planet, and is bidirectional. NonHoMarsRadiusSlice5.zip Some speed increment example…

A bicycle, hanged off ground. Wheels turning. No or fixed steering, (or, both wheels on a rigid frame.) Trying/pushing to 'topple' it, some torques become active. If the wheels are turning in opposite directions, What torques/forces to expect trying to topple it? Next... wheels with their shafts at a right angle. What torques/forces to expect trying to topple it? Next... 3 spinning wheels with their shafts in the 3 axis. What torques/forces to expect trying to topple it?

Could a low-frequency EMP like a strong solar flare reach the bottom of the ocean where Internet cables would be laying? A specific scenario being that a large EMP reaches underwater Internet cables and fries Internet-related systems in Japan and America. And since that sounds like an oddly specific scenario I should mention again that this is for a sci-fi story. If large EMP’s can reach those cables, I am guessing that they would have to be laid wrapped in a flexible Faraday cage, and there would be frequent disruptions as sharks nibble at the cages (as they are known to do frequently with our cables now). Mr. Ask

Hi guys, i'm looking for a material that can withstand and reflect extremely high temperatures. These temperatures are along the lines of thousands of degrees Celsius, the kind of temperatures one would see if you measured the heat four to five inches away from a ball of hydrogen plasma, just wanted to know if anyone had any ideas on the subject

Some futurologist predicts that a vehicles may be designed to levitate on a plasma cushion: https://timeguide.wordpress.com/2014/10/10/the-future-of-levitation/ Does anyone can imagine how exactly it will work?

I am not a native speaker so I can't speak fluently. Please forgive me If I do something mistake here.

Which would you choose to make and why?

I think an "ideal" transport have to solve the following problems of the modern transport. It includes: 1) Be physically incapable to get in any kind of accidents. 2) Create no congestion. 3) Create no parking problem. 4) Create no pollution. 5) Be very fast. 6) Be flexible, desirably all-terrain and offer door-to-door delivery. I think most of this problems (with exception of the last one) can be solved (to a large extent) if people will switch to rail-bound personal transport. Something similar to this: http://www.eltis.org/discover/news/europes-first-urban-personal-rapid-transit-system-approved-poland-0 However, flexibi…

All cornering wheels slide because they are changing their rolling direction, but, the phenomenon of slip angle only occurs when the tread does not slide. This sliding fact is proven by simply studying the travel of a wheel through a turn and noting the vertical axis rotation of the wheel as it proceeds. No matter how flexible the rubber on a tire, the tire has to slide to change direction and follow the curved path. Slip Angle is tied to the belief that the tire tread is laid on to the road and stays in place on the road until it reaches the rear of the contact patch. Slip angle phenomena such as relaxation length, pneumatic trail and self-aligning torque are all de…

Firstly I will apologies if this is in the wrong place, the question I have falls under thermodynamics (maybe) but I'm working on an engineering project. Is there a way to determine the time it would take to boil an amount of water when you only have a temperature? I know you can calculate it if you know the kW/h or BTU used for heating however I do not, I only know the temperature. Let me explain a little better: Lets say you have a metal pipe that constantly has gas flowing through it at 400°C. If this pipe were to go through a tank of water how would you calculate firstly whether you could boil the water, and secondly how long it would take? Basicall…

I have come up with an idea for a solar car. Now I am not going to build it because it would require welding and although my dad knows how to use a welder and a plasma cutter, I still think it would be too dangerous for even my dad to build, not to mention expensive. Even if he cut all the metal himself, the metal would be expensive. Not to mention it could start a fire which would mean no more solar car. But just because me and my dad can't build it doesn't mean I can't come up with an idea for it. So here is my idea. I was thinking that maybe voltage could determine velocity. When the car is charging, it is connected to a solar panel via a cord which plugs into th…

I was wondering how difficult it would be to use lasers to propel a light sail (let's say 500m x 500m) to 12% of the speed of light. The payload would be 5 megagrams. Without a way to slow it down, it would fly through the destination star system too quickly. I thought about crashing the payload into something but with that much kinetic energy, it's like a nuke going off. My payload probably wouldn't survive. I was thinking, what if you have two light sails and when you near your destination, you release the second light sail and the laser array back home bounces the lasers off the front light sail. The front light sail would be speeding up with the back light sail (…

Hello,I would like to calculate the difference between a white surface wall surface and the same kind of wall but with brown outer surface. I would like to know the reflection and absorption indices and then calculate the surface temperature of the wall in the two solutions at the same temperature as the outside air temperature. How could I proceed?Thank you in advance.

We are looking to open a golfing driving range whereby you hit the golf balls at targets and if they go in one of the holes, you are awarded a different number of points. This is already being done by a company with Radio Frequency chipped balls and is patented. I wonder if there are any other types of sensor that might work like laser/infrared?? Really appreciate everyones help! (also I was unsure if this is Physics or Engineering so I double posted, sorry!)

As mentioned before, I am working on a sci-fi project and in my fictional world the earth is being hit by repeated EMP’s, one every few hours. But these are not EMP attacks—they aren’t designed to target electronics by covering a wide range of frequencies, they are like solar flares and just cover a lower set of EMP frequencies. I am trying to design how the world will have changed to live under these conditions. As an example, electric and communication lines will have moved underground, with communication access points poking above ground here-and-there. They are covered in Faraday cages that block low-frequency pulses but allow high-frequency signals through, …

I have no MSc and PhD degree but I am writing academic and engineering projects. how can we sell our projects?

I want to make a kind of pergola with a tiled roof on one side of the house, 6 m along the side of the house and 3 m wide. Usually, these pergolas have supporting posts every 3 metres, but I particularly want a span of 6m between the corner posts, which means I need a strong supporting beam to hold up the roof. A builder friend suggested that I get two 6m laminated wooden beams of cross section 100x200 mm and sandwich a metal sheet (thickness 3 - 6 mm) between them, bolting the three together along the length of the beam. This metal sheet would be vertical, thus effectively working as an I-shaped RSJ, but the whole thing would be much more attractive than just an RSJ. …

I was thinking about my aliens and their generation ship. I did a lot of research on light in general as well as sunlight in particular. Since the aliens are moving away from the sun and facing away from the sun and towards the outer planets when they start their trip with the humans in space, that already dramatically decreases the amount of sunlight that reaches them. But that intensity goes down with the square of the distance. So if you go twice as far from the light source the light source will be 4 times dimmer and if you go 3 times as far the light source will be 9 times dimmer, etc. It eventually gets to a point where it is not visible anymore because only individ…