Engineering

what is volume of liquid in partially filled cylinder. Asvolume= (Area of liquid)*(length of cylinder). I came across the following formula for volume of liquid incylinder but i can't understand it. the formula which i came across is: V= A*h = [(pi*R^2)/2- (R^3+R^2*h-3*R*h^2+h^3)/sqrt(2*R*h-h^2)] *L R= radius of cylindrical shell h= height of cylindrical shell L= length of cylindrical shell please tell me how it is derived and what it mean.

From what i've gathered their already patented and have more horsepower than the average combustion engine. Any thoughts on if this might take off or why it hasn't yet?

Hi there Everyone, I am new to this forum but certainly looking forward to some good conversation. Anyway really the question ive had on my mind for years now is "What speed do you need to travel to space at" Why I ask is that, this whole strap a big rocket to your bum and try and go as fast as you can model is good for a lot of things but BAD for most things. (Just imagine a house) Now if i was able to build a structure (the size and shape is not important) and strap a couple of small but adequate rocket engines to it, that would give me a terminal velocity of say 500mph, whats to stop me from just reaching this terminal velocity and then carrying on for li…

Hi, I have been looking about how to do a coil gun and did one with a coil of copper wire. But what would happen if instead a copper wire I use a entire copper cylinder drilling a hole side to side, so you have a air core coil (simple coil). I've read that the more dense is the coil, more power you will get. My question is, how would it effect the coil gun, would it not work because the resistance that gives the cylinder is so low that could make a short-circuit? Another question I have is, could you do an automatic coil gun at a speed of 100m/s? When I say automatic, I say like 60 rounds per second. Regards, Jonathan

The drones together transport a huge sheet of plastic or plywood in the middle of the hurricane, is it possible?

Situation: At the office we make disposable ovens. Temperature? Up to 500 F. Volume? It varies, but up to 60 ft^3. I say "disposable" because we use them to study the reaction of explosives to elevated temperature. Even under the best of circumstances, the ovens never get used twice. Oven construction is for the most part simple, but they are a pain in the arse to insulate. We have historically used fiberglass insulation like you'd put in your house, but it's itchy and difficult to control if the wind is blowing. We'd like something better. And so I wonder if anyone here has any words of wisdom.... Requirements: - Inexpensive. - Easy to w…

As I understand it when low pressure is at one end of a tunnel and high pressure at the other, air is blown down it. Is that right? If it is, then why isen't there wind turbines that operate in a tunnel, say starting at sea level and running up the side of a hill or mountain to create the pressure difference at either end? Surely then there would be a constant breeze to blow them and they would be more productive, unlike the ones I always see doing naff all.

Hi, my name is Ovidiu and are from Romania.De over three years working on an engine gravity , are about to make a functional model. Now gather parts layout. But I hit the indifference of others. do not speak good English, but for those who want more information, please contact me at email removed

Hello, I'm hoping someone here might be able to shed some light on a prehistoric engineering problem that I am struggling with: I'm working with the reconstruction of prehistoric iron smelting techniques. In short, what I do is build a clay furnace and fill it with various amounts of charcoal and iron ore while blowing air into it at the bottom. Coal and ore is transformed into solid iron that stays inside the furnace and liquid slag that runs out of the furnace. When the smelt is over, I pull out the iron and forge it into bars on a large rock. The furnaces are roughtly 30 cm in diameter and 70-100 cm high. One of the major problems is getting the furnace content…

Hello everybody! Several methods are used to control an aerostat's lift force: vary the ballast, leave gas escape, heat air, use propellers... Not always satisfactory, for instance if an airship isto transport cargo or serve as a crane. In 1982 I used a water solution of ammonia in a rigid bottle and a gas pump to extract ammonia from the solution in a separate envelope. That way, I could extract some volume without a big pressure change nor the associated power and energy need. But toxic, sure. Following here is a different idea - perhaps new, I didn't check. ==================================== I propose to control the aerostat's buoyancy through the…

This article got me wondering just how much of the manufacturing of computers ie laptops ,smartphones and tvs are done completly by machine/automation and how much would have to be left to be fully automated in each case. http://www.mnn.com/green-tech/resear...china-obsolete keep in mind the same premise i have stated in this topics beggining about a fuly automated moneyless society http://www.sciencefo...740#entry712740 http://www.ft.com/in...l#axzz2BvglZLwL http://www.wantchina...02&MainCatID=11 http://ifixit.org/2201/rare-look-inside-foxconn-reveals-more-automation-less-repairability/ okay i know the issue with regards to its harder to re…

hello everyone! i need help in iron ore pellet making. more specifically, promoting sufficient porosity in pellets. this is for my research, i need to know how porosity is formed during pelletization. can any1 help me with this. thanks loads.

If hyppothetically if one was to design a society wherein labor intensive work was performed by machinery in order to eliminate money(like star trek) and the need of humans in complex work could be eradicated to allow for the arrival of new incentives for humankind outside of the confines of monatary growth one must look at each sector of the economy in order elimate the need for scarcity and human labour.(in other words Star Trek) I know the agricultural industry can ruled out via hydro/aeroponics in the case of crops(as plants from the size of lettuce to cocoa trees and tea can be done at home or at the site of production.I also know algea can replace cotton,all for…

Hello dear friends! I'd like the cookers to reduce and adjust their power automatically when the liquid in the pan starts to boil, or the oil in the frying pan. Induction cookers, and some others, react quickly enough for it. Maybe they exist already? I suggested it to a Spanish company in 1996. I imagine the sensor could listen to the noise injected by the pan or frying pan in the cooker. Something like a wire could transmit the mechanical noise from the hot area to the vibration sensor working at cool temperature. Then, electronics could first filter the high frequencies or sharp transitions associated with bubbles, then either count the bubbles per time…

I recently purchased a toy for my son on Ebay that runs on salt water I guess it works on a chemical reaction with magnesium. Anyway the description was very broken english and I would like to know what this technology is called and any information you might deem relevant so I can find a "blurb" online in order to explain to him how and why it works and what else it is used for.

For a science project that I am doing, I am testing different types of insulation in between the walls of cups and how well they keep the water warm or cool. I've done some research on insulation, but I can not find anything that breaks it down into easy terms. Could you please break down R value into easy terms and maybe, if you know, which type(s) of housing insulation would be best to put between the walls of a regular sized cup so that it is the most effective to keep the water cool or warm.

Hello everybody! I am currently finding a suitable process to separate hydrogen from a H2-Air mixture stream (in small scale). I would like to ask for some opinion or suggestions for the following situation: I have a mixture stream of hydrogen and air, i.e., it is composed of H2, O2, N2, and water vapor. Attachment 1 (H2-Air stream illustration.jpg) is a simple illustration about the situation. Some system information are given below: Hydrogen production rate: 900 L/hr System daily operating hours: 10 hr/day The system described above is in small scale. The daily production can only theoretically fill 1.67 tank of cylinder (40L, 135bar H2 cylinder). I was given a task…

hi, i am aware that builders usually build a small mark into a building at it's stress points so that if demolition is required, engineers know where to place the explosives and do not need to spend an excessive amount of time in a structurally unsound building to find the places to put the gelagnite, however when a building is deemed structurally unsound ofter it has shifted in something such as n earthquake, wouldn't that move the stree points making the engineers markings redundant?

Hello, I am looking for material to make a screw type press, or maybe a wedge press. This has to fit inside of a 1200 Celsius oven for 12 hours. I'm pressing a carbon based material to cure it. The press atmosphere will be in a vacuum with an inert atmosphere (argon). Thanks,

Hello everyone. I'm trying to solve a non linear 11x11 system. (for eliminate harmonics in a power inversor) I used Excel's Solver but it didn't work. (Solver couldn't solve the system). Then I found fsolve (a scilab function) but again it didn't work I will attach the code used. The system is: cos(na)-cos(nb)+cos(nc)-cos(nd)+cos(ne)-cos(nf)+cos(ng)-cos(nh)+cos(ni)-cos(nj)+cos(nk)=0 The letters are the unknown angles which are desired. n represent the number of the harmonic because harmonics 3rd, 5th, 7th, 9th,11th, 13th, 15th, 17th, 19th, 21st, 23rd must be eliminated. They are 11 angles so there are 11 simultaneous equations to solve to find the ang…

Hello everyone, <br style="font-family: Tahoma, Arial, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(181, 181, 255); "><br style="font-family: Tahoma, Arial, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(181, 181, 255); ">I'm carrying out a project which provides the cooling of a fluid inside a tube. In particular I should cool water or a glycolytic solution from a temperature of 25 °C to about 0 °C. I thought to do this through the use of the thermoelectric effect, then the Peltier cells. <br style="font-family: Tahoma, Arial, Helvetica, sans-serif; font-size: 13px; line-height: 17px; ba…

This is the 4 years since I found foaming on the surface of cooling water system in our plant site. Until now I don't know the reason why such foaming appears. Charging a chemical to remove such foaming was not effective. I have also checked for leakage of oil or other organic material through heat exchanger or other equipment. Could you suggest me what should I do to remove foaming from cooling water? Or may be some of you have the same problem in the past. Thanks for your help.

Hello, I have a question about our faculty assignment. It is about the compressibility factor z. The professor was introducing us to the COMPRESSIBILITY FACTOR GRAPH and there was something interesting, the curves of the graph that were showing behaviour by different temperatures were crossed at almost the same point, like here: http://www.chem.quee...ressibility.gif, or for air (from wikipedia) here: http://upload.wikime...50_-_1000_K.png And the question was, if that was a coincidence or there is something behind it... Now I have searched for a long time and I did not find an explanation for this, my opinion is that it is a coincidence, because at more ex…

The Idea The idea came from this YouTube video. As good as I believe German engineering to be, I really don't want to pay 40k for a bicycle/motorcycle. I've wanted to make my own E-Bike but the batteries take forever to charge and making a weed eater motor cycle is out of the question The visual: Gear Box Gears A1, B1, C1 & D1 are all 7" Gears A2, B2, C2, D2 & D3 are all 3" A1 is the bike peddle and crank D2 & D3 are alternators or converted electric generators A1 and A2 are connected by chain A2 and B1 are attached directly B1 and B2 are connected by chain B2 and C1 are attached directly C1 and C2 are conne…

Greetings gents! Long time no see. My friend and I have a project in mind that I'm hoping you guys could offer some insight/advice on. My hope is to build a small transmitter that can be fired either from a spudgun, or in a model rocket, and another device that will ping it, so I can launch it off into some local park, and then triangulate its location and go find it. I know how to build a spudgun that will launch a potato core somewhere around the half mile mark. I have some experience with model rockets, but not as much, and I'm not sure what kind of range they could give me. I'm also not sure how difficult it would be to put together the actual electronics, and in su…