Drive Definition and 496 Threads

Why is an interferometer needed to prove the new Finnish researchers hypothesis about coupled photons and not simply an EM drive, which exhaust angles can be changed in order to measure a corresponding thrust change?

I’d like to start off by thanking everyone that’s posted on this site. I just spent two days reading everything on Writing and World Building. Actually that’s a lie, I didn’t read everything, I read every thread on the Writing and World Building forum that might possibly answer the five...

I'm trying to calculate the battery requirements for an experimental home built air compressor. I understand that electromagnetic air compressors operate using attraction and repulsion forces created by electromagnets using the basic magnetic principle that like poles of two magnets repel and...

Hi ! I am looking for a electric diagram of pcb assembly treadmill drive SERIAL:0004-03052. The name of the treadmill Quinton Clubtrack 510 plus . I have already found Service and User Manual for it but , there nothing specific in it...

We all know that starships in Star Trek have artificial gravity. They also have inertial damper. Therefore, we can conclude that they have the ability to counteract gravity. However, as those technical manuals of Star Trek tell us, starships are using impulse drives for slower-than-light...

Therefore this thread, to see if there any ideas that didn't cross my mind yet.

Homework Statement Explain how a cell can use catabolic reactions to drive anabolic reactions, despite energy loss in the form of entropy and heat. Homework Equations Catabolic Pathway: A series of reactions that results in the breakdown of larger,more-complex molcules into small, less complex...

Hi Everyone, I'm about to write a novel on space exploration, and I've decided to use the Alcubierre Drive as the way the ship travels faster than light. I have the basics down about how it works, and I don't really want to go into too much detail in the book about it (most people are familiar...

Hello i am having trouble figuring out the proper profile to use for the worm and the gear. I need to model it in solidworks and everything i am finding online is for spur gears. I need to get the worm and gear to mesh correctly so i can do some finite element analysis on it. I have calculated...

Hello there, can anyone tell me what is a permanent magnet motor drive train and what is the working principle of permanent magnet motor drive train ? i have searched google but i couldn't find anything useful

Hi can anyone help me with this question on inertial forces in gears? Cheers Ali :)

Hey team! I have a flash drive that I have already put a few files on that cannot be deleted by any user other than me on my own computer, but I recently found out that anyone can reformat the flash drive and get past that. Is there any way that I can be able to read and write to and from the...

So, I have a Windows 8 Toshiba laptop, however; quite a while ago, the CD drive fell out. (I'm unsure of how it happened, but it might have something to do with my cat. He has knocked my laptop off of my desk several times.) But I want to install something that is on a CD! Help?

Hi, I am writing an essay for my extended project A Level, and part of this I am writing about the EMDrive. I thought I would be able to skim over how it works mostly earlier but have decided I would rather not. I am struggling to understand how it works and any explanation would be helpful. To...

I have a dilemma with the design of a device I want to build which is acquiring the correct size motor (shape & power) in my price range (even finding one within specs). I have found that the motors from cordless drills are ideal for this application (due to size, price and availability) so...

The drive shaft of a truck undergoing acceleration twists a small amount. That twist defines a helicity. If you just know the rotation of a drive shaft you can not tell which way power flows but if given rotation and the twist of the shaft that can determine the direction of power flow? Thanks!

I am wondering, if the sun is a fusion reactor, it should have an "atmosphere" of neutrons ? So presumably a craft with suitable fuel eg boron or uranium, in a close pass, would be able to use that to react with the fuel in a suitable drive ? Probably not good for humans - (!) but for an...

Homework Statement This question was posed on a recent test I had to write. Our professor does not let us keep our graded tests nor does she share solutions, so all I have is the problem statement. I've made an effort to recreate the solution I had, but I got it wrong in any case and I'd like...

Hello all, This is my first post, but I'm no stranger to skimming the boards. Always can find helpful stuff, but I'm stumped on this one. The situation is we have a Kohler 17 hp electric start gas engine horizontal shaft that max's out at 3600rpm. We are attaching a self-priming water transfer...

Discussion of gravity waves got me thinking about objects that seriously distort spacetime and I started wondering about the Alcubierre drive idea. Let's make the assumption that negative energy density is in fact possible and another species has figured out how to do it. What...

I am stumped and out of time (got till end of day). I'm trying to recover some files off a crashed Win7 laptop. I'm using a bootable CD with Alt Linux RescueLiveCD and testdisk to copy them to and SD card. I'm new to Linux, so feeling around blindly. The SD card has been full-formatted on my...

Suppose we have an insulated cylindrical container with a piston inserted from one end. Suppose the volume confined by the piston is full of a hot gas. Now let the gas drive the piston so that the volume is increased. Did the entropy of the system decrease because some of the energy of the...

Simple question, What's the advantage of having more phases in an inverter? Like why have 6 or twelve phases? Is it something to do with harmonics? I know that the higher the switching frequency the further off in the freequency spectrum you can push the harmonics, but I can't see that being...

I have a lead screw drive. The stepper motor puts out 280 oz-in of torque. Its attached to a 1/2 inch dia., .200" pitch, 2 start lead screw. There is a plate that's attached to the screw that moves back and forth along the screw. How much force can that metal plate exert in a linear motion?

I have built a rear wheel electric with two motors one for each rear wheel. The motors have separate controllers and both are controlled by a single throttle. This throttle sets a torque for the motors . In a straight line the torque is the same for each but when cornering the torque setting is...

How much of a differential pressure does a typical thermodynamic steam trap need to discharge condensate? i.e. Say one needs to drain condensate from a shell under vacuum 310 mmHg abs, would a thermodynamic steam trap work correctly if I connected the discharge pipe to a vessel maintained at...

I recently read a post on "How much energy does an alternator use?". So I read some more online articles and found that some people have thought of running their alternator on their drive shaft. This doesn't seem more economical to me, since you will still loose engine power . If the alternator...

Hello , this is my first post. I just had this crazy idea if you can make a car that you can drive forever. I just want to check if this is possible. I know that the "motor powers the generator and generator powers the motor" thing doesn't work. Cause it isn't 100% efficient and bla bla bla...

Hi, I'm a beginner in mechanics so I need some help with a project I started. My project consists of a small kart-like car. The car will be Rear-Wheel-Drive and Rear-Engine too (RR layout). and I am willing to use a small 110cc moped engine. I have a trike Differential Gear for the rear shaft...

I couldn't find a relevant forum - that I could recognize, anyway - so, if this is in the wrong place, please feel free to move it to a more appropriate forum. Ennywho, I have a question on terms. Let's say there's a space probe's propulsion system that is currently providing an acceleration...

The Alcubierre drive is a very interesting theoretical idea, if only as a thought experiment. It might in principle allow travel even faster than light speed (according to some external frame of reference). But we know that faster than light propagation could lead to history inconsistencies...

Hi guys, I wanted to ask something that I am interested on Which is on the traditional sewing machine mechanical mechanism (On the foot paddle part) Image taken from Google. From the image above, a typical sewing machine For such application, what is the "Name" for it? Im more likely wanted...

1. We know that we need 5000N to drive a nail 2.5 cm into a wall. How fast does a hammer of 500g mass have to be in order to drive the nail in the wall in one stroke?(look at the picture if it is unclear. The 2 cm in the picture should be 2.5cm) 2. F=m*a W=F*x x=distance 3. I thought it...

Homework Statement The robot crawler has a magnet attached to it. The idea is to get the crawler up the wall. What is the magnetic force required to hold a object (in this case) a robot crawler with an attached Magnet? Is more magnetic force required to hold the crawler while it goes up the...

Hello all, I have two rollers that will be rotated which will in turn rotate another tube on top of them. The connection will be made with a drive chain between the motor sprocket and the roller sprocket(s). My question is, would it be better to connect the chain to one roller, or to both? I'd...

Recently, I've been watching a lot of those youtube videos debunking gyroscopic propulsion because everything about it violates the second law of motion or something... This got me thinking, if I was floating in space and I decided to swing a large rock on a rope around me, to generate some...

I have seen this news earlier that the physicist accidentally discover a warp drive an idea of traveling as fast of speed of light? Is this possible? How it will work?

Hi there, I've been looking through the web for hours but I cannot find a DC drive that can do everything I have in mind. After a few hours and being thoroughly confused. I was wondering if someone on this forum would be of any help. I'm trying to buy a 0.5 HP Permanent magnet DC motor to...

Is a warp drive actually possible to create? If so, how long until we can develop one? Is it at all possible that they could be developed during our lifetimes? I'm asking because of this article...

So further confirmation from NASA that this might work. Anyone has any explanations on how this could work? I find it fascinating. http://io9.com/new-test-suggests-nasas-impossible-em-drive-will-work-1701188933 http://www.nasaspaceflight.com/2015/04/evaluating-nasas-futuristic-em-drive/

Hi I have built a gear drive for robotic arm that uses a worm set (worm gear +worm) at stage one. Worm (wheel) is of bronze and worm gear is steel haing a lead angle of appx 8 deg. This set is further coupled to a spur gear set that further increases the torque such that the over all gear ratio...

Hello: I have a problem with a drive located in a small production area. It has failed three times due to arcing between two inputs to a control board. These inputs are about 5mm apart and the manufacturer is saying that this could be from material collecting on these terminals or from...

Time and Time again I see the same term being thrown around amongst people and countless Articles claiming that Warp Drive might be possible. And that is through The Casimir effect. Correct me if I am wrong but the Casimir effect does not demonstrate negative exotic matter. From my...

I've got a Lenovo y510p laptop, and I can hear the hard drive spinning up and spinning back down about once every 30 seconds to once every 2 minutes while I'm using the laptop normally. It's starting to drive me crazy and it's distracting. I'm wondering if this is affecting the lifetime of my...

I want to calculate the torque coming onto a half shaft in a very particular event. The event is I let's say I am in 3rd gear and have reached my max torque zone after which I have taken my foot of the acc pedal...nw I m letting the the vehicle coast as soon as it reaches say 60% of max power...

I am currently trying to drive a DC brushed motor, but its specs are unique enough that I haven't been able to find a suitable driver. I found one that almost fits our application but our amperage is closer to the peak then the continuous. So is it possible that I could put two of the same speed...

Which will produce consistently faster lap times, when landing a 4 wheel drive race car at speed: - front wheels first - rear wheels first - front and back simultaneously Given a 4 wheel drive race vehicle traveling at racing speed, suspended in the air, after driving off a jump or drop off...

I am trying to drive a 115V DC brushed motor with a DC power supply. Most drivers I've found are for AC to DC and the 115V supply seems to be to much for most DC to DC. Has anybody worked with driving motors with large DC power supplies? Or does anybody now where I might find one? Thanks...

Our hard drives are reaching the limit of memory capacity and they are studying about the idea of using the molecules and atoms to store memories. Can information or memories be stored in the quantum state? When we heard of quantum state applications in computer, we mostly think about quantum...

There is a 2D array of x and y positions of a vehicle measured at an interval of one second, e.g.: [FONT=Courier New]x y 1, 5 1, 6 1.5, 6.8 ... I need to somehow quantify how a given driver approaches curves (i.e. driving style - does he/she drives aggressively or not). For this, I divided...