COMMUNITY

Accelerative problem...

Ok I'm in the planning stage of a secret project that is going ot be very risky if it isn't right, I need to accelerate ~100kg from ~20km/h to ~100km/h (I gave it all metric to help) over a reasonably short period of time, any improvement on 100km/h is welcome because I've done this without rockets in the past. Can anyone give me any idea where to get rockets that would be of suitable power, the largest estes rocket peaks at 25N of thrust and falls to 10N of thrust for only 2.5s after this, 10 of them would cause an acceleration of 1.41666. m/s2 which isn't much use to me. Unless I did my maths wrong, it's been a good while since i've done anything like this... Basically I'm looking for thrust and alot of it, preferably from something inexpensive but on this one I wouldn't mind paying a bit... Also I did look at the homemade candy rockets but I wasn't sure I'd be able to achieve the amount of thrust safely...

Posted by killerjackalope 10 years ago

Ok, here it goes:   In the description concerning general relativity, the following scenario is depicted:  Jim and Slim are riding a "Tornado" ride (goes by different names, but essentially is a centrifuge that pins you against the outer wall and then drops the floor out from under you. Sometimes calle d PUKE machine). Anyways, looking at the ride from a bird's eye view, one measures the circumference and the radius and we find that the ratio is two times PI or about 6.28.  Now that is from OUR perspective, but from Slim's and Jim's measuring the circumference (so says the book) will give a different answer since they are traveling at high speed (assuming the speed is fast enough to invoke the Lorentz contraction).  Thus, he says in the book that his measurement will come up short and therefore not be the same ratio noted.  I don't doubt this, but I have a problem with not taking into account the lengthing of the circumference because of IT'S motion forward.   Am I missing something?   Why wouldn't the same effect  be proportional to the lengthening of the ruler used to measure the circumference, seeing they are traveling at the same speed?   Am I taking his example TOO FAR (in other words, he is assuming the ride is there but not physical)?   Maybe I over analyze?  :-)

Posted by Goodhart 6 years ago

The possibility of crane-based railguns

It's just a curiosity. Anyway, so there I was, reading up on railguns (just for the heck of it), and after reading the part mentioning "millions of amps", it got me thinking, "What power source can provide millions of amps?" Then and there, I thought, "Lightning!", but how I could I use it? Wait... Oh, cranes! I could stick the railgun on a crane, then whenever the crane gets hit by lightning, it would fire a projectile! Now, who's willing to risk their lives to load a piece of metal up there? :D Nah, just joking. Anyway, I was just wondering if this idea would be feasible in the first place, and what would it take to implement.

Posted by nutsandbolts_64 5 years ago

Accelerator in a bowl

I want to help my kid explain particle accelerator with this project; I think I get the conductive balland positive/negative strips. What do I use to get "high powered dc current"? any suggestions ?I would like this to be self contained i.e. not plugged in. Thankshttp://www.symmetrymagazine.org/breaking/2008/03/26/accelerator-in-a-bowl/

Posted by sabadin 9 years ago

How to measure Velocity/Acceleration of bicycle

I want to measure velocity or acceleration of a moving body(E.g: Car,bicycle,etc) without using a GPS module. Is it possible to calculate coordinate acceleration or velocity using an IMU.

Posted by Jonathanrjpereira 2 years ago

directx help

Ok I am having problems with my directx driver and I need help. For some reason unknown to me almost all of my games can't start because the following directx features are not working:Directdraw acceleration,direct3d acceleration,and AGP texture acceleration. I did test directdraw and that work as it should. So what do you think the problem is?

Posted by knexfan9182 9 years ago

More on the LHC Countdown

The Large Hadron Collider is indeed large: the underground particle accelerator is about 17 miles in circumference (it is circular). Located between France and Switzerland, the LHC is now almost ready to begin full-length particle accelerations. Researchers are attempting to collide protons together that are accelerate to 7 TeV (tera electron volts).Following Tetranitrate's first post, LHC Countdown, people have been looking for more information.Even More on the LHC from Kiteman, with more explanation.Here is a great set of pictures from Boston.com, showcasing all stages of production of the LHC.For a better visual understanding of how it works, take a look at this LHC animation from the official LHC web site.More general information from the LHC web site.As I like to say, this is large and in charge.

Posted by joshf 10 years ago

Leon Lederman, Fermilab, Tevatron, particle accelerators and my school

Http://en.wikipedia.org/wiki/Leon_M._Lederman He is coming to my school in a week and all the students are allowed to go meet with him, and there is a special lunch organized for the students with him as well. Being the director of Fermilab which has the Tevatron which is the biggest particle accelerator in the world and is a physicist landmark. I am very excited about him coming and I wanted to know if you guys could help me think of questions because this may be a once in a lifetime thing for me!

Posted by astrozombies138 10 years ago

trigger in front of hopper?

How bad would a trigger be if it was in front of the mag, for example an uzi, the ram rod will be pushing the ammo but both ammo and ram gets held back by the trigger so no time to accelerate.

Posted by Katarukito 10 years ago

Figuring Out Acceleration on a Potato Gun

My newest craze is potato cannons. I built a simple potato cannon powered with hairspray. I didn't plan out ratios of chamber volume to barrel volume, but I must have guessed pretty well because the potatos go far. Really far. I shoot them in an empty bean field and they stay in the air for 10 seconds before hitting the ground at what I guess is 300 yards away. I want to measure it to be sure. I'm probably exaggerating the distance out of sheer amazement. But the potato goes really far. I got to thinking, though, that I could go beyond just shooting the potatoes, and actually turn this into something useful. If there was a way to determine the acceleration of the potato inside the barrel, that would be super cool. I've had a few ideas on this so far:The most complicated involves drilling holes on each side of the barrel. The holes would be every inch the entire length of the barrel. On one side led's would be installed and wired in parallel to remain on constantly. On the other side photoresistors would be installed and also wired in parallel with a microcontroller. When the potato traveled down the barrel it would block the light to some of the photoresistors and the microcontroller would get a readout. If there was a way to program this whole system and get a graph on a computer of the acceleration/time curve, that would be awesome!! Another way would yield a less accurate number. Shooting the cannon straight up and timing how long it takes the potato to hit the ground would give you the initial velocity. Vf = Vi + Gt, so: -2Vi = -9.81t . Once the initial velocity is known, if the time it takes for the potato to leave the barrel can be figured out, the acceleration could be figured out.Let me know what you think!Note: I will attach images as they come.

Posted by intoon 11 years ago

super SPEEDY glue

Super glue. Good stuff. A bit slow sometimes. Baking soda speeds it up. But I want it clear.  I don't have accelerator. I think I could get some on the far side of town, but don't know someplace close to buy it. Internet says moisture cures it. I don't find this to be true. Internet says heat, air movement, UV.  At the moment, my project is sittin in the sun, which gives all 3 things, but there's no control group.  Qs What sorta place sells accelerator for cyanoacrylate? Which techniques have sped you along with it before?

Posted by Toga_Dan 5 years ago

I'm having trouble with my sketch regarding how to code , my stepper motor traveling to a limit switch then reversing and accelerating to another limit switch.

I'm having trouble coding at a point, I built an Equatorial Platform for my telescope so I can track the stars.I have a Nema 23 stepper( 1.8 * step, 200 steps per rev.) motor with an Arduino and a Easy Driver for my micro controller. My problem when I make my sketch I have the stepper motor running at 92- 104 RPM with a potentiometer to fine adjust, at this point when my platform hits a limit switch then I want to reverse the motor and accelerate it to 2000 RPM then decelerate to 25 RPM before the platform hits an other limit switch, then start the process over.How do I incorporate accelerating coding that to a certain point then decelerate motor before it hits the other limit switch. Do I need to find some timing coding ( for some length of time), before I want the motor to decelerate to hit the second switch. I don't want the motor running at 2000PM to hit the limit switch, I want it to decelerate before the limit switch. then reverse the motor again to 92 - 104 RPM. I'm a novice at coding with little electrical background. Your assistance is greatly appreciated. Jack Brockhurst e-mail jacam9803@yahoo.com

Posted by jacam9803 5 weeks ago

Minecraft instructions

I'm seeing a large amount of Minecraft instructions lately https://www.instructables.com/tag/type-id/?sort=none&q;=minecraft They seem to have appeared mostly in the last 6 months and at an accelerating rate. Are these within the scope of Instructables? Many of them are merely instructions on how to play Minecraft.

Posted by jurgemaister 4 years ago

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.

Posted by kelseymh 9 years ago

D.R.A.G.O.N

This is one of my brothers crazy contraptions, its called the Deadly Rail Accelerated Gun Of Neutralization, or DRAGON. Its ridiculously powerful, and shoots farther than my rifle. It is also the first dual-rail rifle system on the site, providing it with extreme accuracy and power.

Posted by Big Z 8 years ago

Building a full auto coilgun

I've been working on this project for about a year now, the first stages of the design started like 5 or 6 years ago. It is a full auto 19 stage no-capacitor coilgun. The accelerator is 3ft long! It will use an advanced coil timing system that should allow more efficient acceleration. The custom 3d printed magazines will hold about 90 shots, maybe a little more. It should be capable of firing at a rate of several thousand rpm but I might tune it down to ~500 rpm to keep it cooler running and make the ammo last. If you want to read more about this design you can see the page on my website: http://www.ourbadscience.com/#!em-guns/cwjy Here is a video showing the current progress on the coilgun:

Posted by Jaycub 3 years ago

Look out, Switzerland!

Tomorrow*, the Kite family are going to the land of cuckoo clocks, cartoon cheese and particle accelerators. We're visiting friends in Geneva, but if you're out there and the environs, and see a chap in a leather fedora and Robot shirt, or wearing a Robot lapel badge, stop and say hello. I'll give you stickers. (*Wednesday 6th - Wednesday 13th)

Posted by Kiteman 4 years ago

Cheap accelerometer?

Hello all, I'm building a textile interface using LilyPad Arduino and accelerometers to catch the movement and acceleration of points on this interface. As I intend to use a relatively high number of accelerometers (5), I've been wandering if there is any DIY accelerometer, or any cheap solution to it (as I'm brazilian, lilypad's accelerometers have a pretty high cost) . Thanks,

Posted by lgguts 6 years ago

Bite force transducer embedded in a gumshield

I am a quadriplegic and paralysed from the shoulders down. I am working on a project to allow me to control a go kart. I have limited use of my arms which should allow me to control the steering but I am trying to get another degree of freedom to control acceleration and/or braking One of the ideas is to use a piezoelectric type force transducer in the mouth to control and acceleration via an arduino or similar. The transducer would detect bite force and it would be converted into control signals for the throttle and/or brake. It would be embedded in a gumshield and it would be acceptable to have a cable coming from the front of it to the control System. I am wondering has anyone worked on such a project and could anyone point me in the right direction please. The gumshield may end up looking something like the image here.

Posted by greenonyx 4 years ago

Wimshurst Machine + Coil Gun = ?

I recently participated in my school's science fair. My project was about magnetic pulse accelerators(coil guns). I have been thinking about making a Wimshurst machine. Could I attach it to the coil of wire to get a very impressive result?

Posted by H20 6 years ago

30 minute DIY AM particle-acceleration

Last fall, I verified an initial relationship of resonance between two bifilar wound wires (of any length). The predictable sequence resonates at the following levels - 20 Hz, 30 Hz, 50 Hz (and all multiples of these 3 frequencies). I used a Parallax Propeller Board - with PGEN 2.0 software from Innovationshop in Germany.   This software allows for a waveform built of 32 stacked frequencies to be created and amplified.   I have used it to successfully break the bonds of distilled water - as one of my earlier videos shows 2 years ago. JL Naudin calls it a "GEGENE machine" - but it is a simple, tabletop, particle accelerator.  His results can be found here:::  http://jnaudin.free.fr/wfcbooster/indexen.htm One of my earlier videos from May 2013 - can be found at YouTube - I just want to show people how this works.  It is a 4 minute explanation of open-sourced Patent 512,340.:::   https://www.youtube.com/watch?v=HHxK1VWrXcM The materials:: 1 - 1800 watt induction cooktop (iron, copper, or 3-ply stainless cookware is required on these types of devices) 2.  50 feet of 14 AWG speaker wire 3.  2-10 count of 500-watt halogen lightbulbs. 4.  wire, solder & connectors for the wire-ends. 5.  1 stainless-steel HHO DC electrolyzer tank.  6.  Cooking Pan - or light fixture (to hold light bulbs). 7.  High Voltage diodes (500 Volts or higher)

Posted by jabel4 3 years ago

need help on electric go cart

I have an idea for making a go cart with a in wheel motor, same idea as the volvo recharge My idea is to have electromagnetic "flaps" that can be turned on and off and i was wondering how i could turn them on and off precisely so i could control the acceleration and other variables I was thinking about using a hall sensor but i couldn't control very much about that so any ideas would be great thnx The flaps that i am talking about are a coil of wires, laminated, and i will have alot of them. then i would place them on a smaller wheel side by side. they need to be actuated so that if there was a magnet that is before it the coils will turn on and when it passes it will turn off, i would need to control the actuation of the coils so i could accelerate. And would a variable resistor be able to control the speed of the cart? Report Post Reply With Quote

Posted by squirt8500 9 years ago

Will it centrifuge?

I have recently obtained a desk-top centrifuge which has yet to be used. It takes tubes with a volume of 1.5ml, and subjects them to accelerations of up to 8500 gravities (by comparison, most theme park rides top out at 5 gravities).So - what should I put in it?I plan to collect ideas and then spend an evening or a weekend in the shed...Edit:First results are in.Blood!The Club Edition

Posted by Kiteman 10 years ago

DIY Steering Wheel

Hello, I'm new here. So, lately, I've been thinking about making a steering wheel for my PC, with a simple up-and-down gear box and 2 pedals for acceleration and brake. Steering Wheel. I'm using a polystyrene sheet, to cut out a wheel from it, and in the center, there's space for installing a phone holder. I'm planning to use my phone's gyroscope and simulate it to the PC. Pedals. I've figured by using foams underneath, we can place a nail and a foil separated and when we press the pedal, the foil touches the nail and circuit gets completed. I've a general idea, but I'm stuck on how to give that signal to PC as to simulate as a button (say for acceleration and brakes.) Gearbox. For the gearbox, I figured it might be easier to make an up-down box (as in pulling the level shifts the gear up and vice-versa.) Here too, The part where I'm stuck is giving the signal to the PC. Anyone who can help me, please?

Posted by RohitR78 2 years ago

Sushi on a Stick, Glowing Fingers, Secret Poster Stash

Sushi on a Stick Glowing Fingers Secret Poster Stash Cigar Box Guitar 10-Minute Walker Bot Homemade Magic Shell Wireless Sensor Datalogger Geometric Wall Art LEGO Headphones iPhone Macro Lens Simple Rolly Bot Build a Log Cabin Macro Particle Accelerator DIY iPad Case BBQ Gas Conversion

Posted by randofo 7 years ago

Physics question has me stumped

A large crate sits on a pickup truck which has coefficients of friction mu(s) =0.6 and mu(k) =0.4 . My question is how do I calculate the impact velocity if the truck accelerates (-8.0 m/s^2) and the crate slides forward 1.5 m to impact the back of the truck? Can anyone please walk me through this problem whenever you get the chance? Thank you.

Posted by GThreep 3 years ago

liven up peopple...

Hello peoples. Ive been away for some time now, and i come back and not a single person has posted anything here. i know its pretty dead, but if you dont all contribute, this won't work. theres plenty of free stuff out there for the taking, and i know EVERYONE on this site has an excess of junk. so post some paper clips, cd spindles, computers or particle accelerators, and if you need something, just ask...

Posted by nickdisney 10 years ago

Would you guys like an instructable for this gas powered bicycle?

I was wondering, who would like to see a detailed instructable with step by step instructions, lots of pictures, and parts lists for how to make this powerful motorized bicycle from scratch (without a kit)? The motor is a heavily modified 79cc horizontal stroke predator engine from harbor freight. The bike has a top sustainable speed of about 40mph. It also has enough torque to accelerate uphill, take off from a standing start with no pedal assist, leave Lance Armstrong in the dust, and do wheelies even with my 29" tires. Gearing can be adjusted for higher top speed at the expense of having less acceleration and hill climbing power. (Although in all honesty, I wouldn't gear it to go much more than about 45). Other features include an automatic clutch, the ability to get 170 miles per gallon, allowing you be cooler than all your friends, and costing a fraction of what you'd pay for a vespa. If you want me to make an instructable, comment below! Also tell me whether you might actually build one, or whether you just want to see how I did it.

Posted by TheNecromancer13 2 years ago

Control a Magnet Fidget Spinner with Arduino and Electromagnets?

Hello! I was wondering if it would be possible to control a magnet fidget spinner with Arduino and electromagnets. Any ideas? The basic concept could be something like this:  Take a common 3 bladed fidget spinner and attach a magnet to each blade end. Build an Arduino contraption with a sensor that observes the spinning of the fidget. Add and electromagnet to Arduino. By repeatedly turning on and off the electromagnet with proper timing and observation you should be able to accelerate (or brake) the spinning of the fidget... right?

Posted by Vesa Seppänen 1 year ago

LHC fired up this morning

At 7:00 GMT this morning, engineers fired the first beam at the Large Hadron Collider.It worked on the first try.We're not dead.They didn't discover extra subatomic particles previously unknown to scienceyet.Pretty boring, really.Actually, apparently they had technical difficulties the night before-part of the cooling system (which keeps the magnets cool. Very cool. 1.9 degrees kelvin, to be exact.) failed. They worked on it and managed to fix it overnight though.Details via newscientist (includes video).Via guardian.co.uk

Posted by Lithium Rain 9 years ago

Gs to Speed Converstion

I am looking for the math equation that converts G load to speed using Arduino (https://www.adafruit.com/products/2796)?  I am building a high power rocket data logger/controller. I need to know the speed by using accelerate of the bird. Yes I might be able to use GPS info, but at super sonic speed GPS can not keep track of the speed. The bird is a 2 stage bird. I want to stage when about 40% of the speed has bleed off.  Thanks Rocket Nut

Posted by Rocket Nut 1 year ago

All right, who stayed up to watch it?

Who saw the LHC first beam? Anybody? My sister and I stayed up until the wee hours of the morning to watch it. The stupid live webcast didn't work. Oh wells. We'll surely see it on the news...it would've been cooler to watch it live though. : \ On another note, I told you so. :D

Posted by Lithium Rain 9 years ago

A strange new beast in the particle bestiary?

Interesting article from the BBC website :- A particle accelerator in the US has shown compelling hints of a never-before-seen particle, researchers say.  The find must be more fully confirmed, but researchers at the Tevatron are racing to work through existing data.  If proved, it will be a completely new, unanticipated particle; researchers say it cannot be the much sought-after Higgs boson.  It could also signal a new fundamental force of nature, and the most radical change in physics for decades. The full article is HERE.

Posted by AndyGadget 7 years ago

Build your own demo of a particle accelerator!

This was originally posted by an I'bles user in the "Feedback" forum. I've suggested he repost his questions under Science, and hope to answer them there. In the mean time, this video from the March 2008 issue of Symmetry Magazine (a joint SLAC/Fermilab publication) is really cute. The original article's video includes a bunch of related items which are worth checking out themselves. The high voltage (at least 50kV, I think) DC supply needs to be pretty stable -- you can't just throw a rectifier bridge onto a wall cord, but other than that, the project would be extremely simple to build. I've sent Dr. Johnson an e-mail to see if I can get more detailed specs. Update 4 Jan 2009: Todd Johnson and I have exchanged a couple of e-mails about this project (d**n, I love the collegiality of the scientific world!). For the DC power supply, he used a potted module (i.e., an enclosed unit with no accessible or dangerous components) designed for use in a negative ion generator (like the "Ionic Breeze"). He bought the unit surpus from http://www.goldmine-elec-products.com/prodinfo.asp?number=G9695 . The bowl you see in the video was custom made from acrylic. I thought something like a Pyrex mixing bowl would work, but the "corner" where the flat base joins the spherical body introduces a barrier to the ball doing what it should do. The coating on the ping-pong ball is something called http://www.goldmine-elec-products.com/prodinfo.asp?number=G16133 "wire glue"], touted as a substitute for solder. For this project, he covered the conductive paint with some clear Krylon for protection. Dr. Johnson and I are discussing the possibility of collaborating on an Instructable for this project. As a result of the video publicity, he's already gotten some inquiries on how to build it, so this would be an appropriate venue. He has a substantial amount of performance data and physics background on the device, which we will include in the ultimate publication.

Posted by kelseymh 9 years ago

My Cycle Two Stroke Engine

Hello everyone, I wonder if any one can help me? I have fitted a two stroke engine kit to a cycle of mine, the thing was running perfect for 220 odd miles then starting stopping and would start again after a few minutes of pedalling. I have changed the petrol mixture and this has seemed to alter things slightly, now it will go but will not rev and only goes to a certain speed then starts kangarooing. When I engage the clutch it will not ideal it just conks out. Could there be something wrong with the accelerator perhaps? Thanks a very frustrated Paul

Posted by Paulygriff 4 years ago

Resistance Isn't So Futile

Nissan has introduced the Eco Pedal, an acceleration pedal that pushes back on the driver's foot if the driver is supplying unnecessary pressure and therefore being fuel inefficient. From Wired News: Nissan estimates that the Eco Pedal, coupled with the already ubiquitous instant fuel readout on the dash, can increase fuel economy 10 to 15 percent.While it may hinder driving freedom a little bit, it seems more like it's there to be a friendly little reminder. Sort of like parents when you're learning how to drive. Very environmentally friendly, fuel optimizing parents. Nissan via Wired News

Posted by joshf 10 years ago

Vice CKG Bolt Action Rifle

I haven't posted anything for a few months, and I decided to begin work on something that would blow everyone away.  My goal was to create the most efficient, most power, most versatile mag fed knex rifle ever.  I discovered a way to do that when I came up with the Bullet Transfer System (BTS) that you saw in my BTPA pump action rifle.  However, the BTPA had a several drawbacks.  The first was the size of it.  It was just way too big.  Second was that the ammo it shot was connector ammo, and would start spinning out very quickly.  Last was that the ram barely had any time to accelerate,  as the bullet was placed right above the handle.  I suddenly thought of a design that would solve these problems, quickly drew them out, and began work.  The result was the most efficient, versatile, and powerful mag fed gun ever made, the Vice CKG.  CKG stands for Compact Knex Gun, and I am truly proud if it.  The trigger is a variation of Zak's so I give him credit for that.  So exactly how efficient is this gun?  I was able to get 60+ feet with a string of two #64s with the long range round.  The yellow rods get around 50 feet, only because they spin out after a while, but with two #64s unsharpened yellows can go right through a box from a few feet away.  What's the secret to this incredible efficiency?  First off, the firing pin is a grey rod+a gray connector long, giving it that extra room to accelerate.  Second, the trigger is as far back as possible.  Third, the rods are placed as far away from the ram, giving it time to accelerate.  Finally, the BTS allows the bullet to stay in place with nearly no contact between the bullet and the gun.   THIS IS THE MOST POWERFUL, EFFICIENT, AND VERSATILE MAG FED GUN OUT THERE. (I know that statement may sound a little bold, but I am very confident in saying it) Pros 60+ feet range single shot with two #64s 50 feet range with yellows with two #64s Extremely versatile (perfect for long and close range) Looks great 15 yellow rod mag capacity You will dominate the battlefield Cons Reload time (for me anyways)   This video is a little out of date, I have made some upgrades since it was made/

Posted by Kinetic 8 years ago

Paleontologist prints fossils in 3D

French palaeontologist Paul Tafforeau has been using 3D lithography to make microscopic fossils, hidden in opaque blocks of amber, vsible for detailed study.Using intense light from a synchrotron (a kind of particle accelerator), he illuminates the amber, revealing, so far, over 350 specimens of trapped insects in 2kg amber. Some of the species are new to science.3D images are built up with micro-tomography, and these digital images are used to recreate millimetre-scale insects as plastic models at a scale that allows easy handling and visual study without needing microscopes.BBC Story (included iPlayer video, which may not be viewable outside UK)

Posted by Kiteman 10 years ago

airsoft + vex robot

Ok i have avex robotics kit right. and i want to put a airsoft gun on it. the robot now is like a 4 weeled car. and i have a place to mount and stuff but i dont know how to make it fire by remote control of any kind. First i tried the little controller tht my sercos plugg in thinking tht when i press the accelerator it would send a signal to the servo at tht time but its not like tht. Its is wierd it has a constant voltage and the servo sorts out when it gets fm signal to move. Also is there a way i can use a wirless xbox controller the old ones?? OR ANY OTHER IDEAS PLEASE HELP?!!

Posted by fretmelter 11 years ago

Remote Control Car Controlled By Computer

I'm doing a project where I am rewiring a remote control car remote to work using a computer interface. I've found a few tutorials on how to do it, but they all deal with a "button" controller, where the motion is controlled by pressing buttons rather than using a "pistol grip" controller, or one with a wheel to control turning and a trigger to control acceleration and deceleration. Has anyone tried this, or does any one know if I would be able to use the tutorial linked below with this controller. I highly doubt it would work, but I would like a better opinion.http://jbprojects.net/projects/rc/

Posted by Claytonian 8 years ago

electric gun......... Safe? + airsoft

Could you make a coil gun, instead of shooting bolts it shoots a nail. The tip of the nail is dulled. When you fire the nail accelerates to a really fast speed, hit's an airsoft pellet, the pellet goes flying, the nail head gets stuck by a mechanism (barrier). would this be safe, or be a really really bad idea and the pellet won't get that fast. Just asking cause i've always wanted to make some sort of cool electronic gizmo shaped like a gun that does cool stuff, like a coil gun, or maybe makes stuff glow or something, I dunno, something cool ;)

Posted by guyfrom7up 10 years ago

SF's Hybrid Buses are Easy to Shut Off

This is an odd one! Apparently, kids have been playing around with the hybrid buses as they roll along -- by turning them off. The off switch is apparently just under a unlocked panel on the side of the bus."When that happens, the drivers can't accelerate, they lose radio contact with dispatchers and the interior lights on the buses go out. The power loss does not affect the brakes."They say that they're working on locking the compartments -- which seems like a good start -- as well as increasing patrol among the areas, as other attacks were common.Chronicle via Gizmondo

Posted by zachninme 10 years ago

12kj coilgun project

Hello I am working on a new coilgun using 15 10000 uf 400v 17200 ma capacitors. The accelerator is 5 stage, while using 3 caps per stage each stage will have 2400j of energy. I will be posting updates on this forum every month or so. my current setback on the project is charging what I am wondering is what input current and voltage and output current would I need to charge 3 caps decently fast. once that is solved I will line up 5 in parallel to charge all (1 per stage) if I need to line up a greater amount of a lower rated circuits I will.

Posted by ThinkDesignConstruct 3 years ago

physics mini potato spud gun homework help

Im a grade 11 n i need to write an essay about mini spud gun, but i dun reli understand the physics theory behind it? i search it thr the internet n is now more confused? which one(s) of these is it involved with?>> Projectile Motion Newton's 1st Law of Motion: Inertia Newtons 2nd Law of Force and Acceleration Newton's 3rd Law of Motioin: Action and Reaction Momentum Energy he Boyle Law or the Kinetic Theory of Gases?? why? thanks so much! im not askin like for ppl to do my hw, i juz wanted to know which one of those is a potato gun involved wif.thanks!

Posted by babyduck 10 years ago

Hoax? A task not only for high-schoolers...

Well, exept for being quite a fun thing to watch, it also should work as a great Physics problem for someone like me (or a bit younger)-studying all sorts of Mechanics and Newton's Laws to work on... The task is to estimate the acceleration the motorcycle should have to do it, and whether it's significantly larger than the one stated in some technical data (there is the motorcycle model somewhere in the video's name).        If you have a go on it and are a) school-aged and b) not sure you are right, PM me. If you simply want to share your results and/or opinion, write here (but try not to put any solution-I mean formulas). In case the video doesn't work

Posted by gruffalo child 7 years ago

To all schools- Cut the trophies from your ceremonies.

So yesterday I had a graduation ceremony at school.  The school basically gave awards/trophies/certificates to people who made good grades, did well in Accelerated reader, and performed well in class.  I personally got 2 awards, a certificate for making the A/B honor roll, and some fake \$1,000,000 dollar bill that looks like it was straight out of Monopoly for reading over 1,000,000 words in the Accelerated Reader program.  I promptly turned my certificate into a paper airplane and threw it in a corner where it will be forgotten until the end of time, and I wrote "OVER 9000!!!" on the fake bill. Most people won't realize that these certificates won't be worth wiping butt with a year from now.  Nobody will care what you made in Junior High in your final year of High school.  Heck, the only highlight of the ceremony was that I was friends with the person who got the biggest trophy, and he let me borrow it for a few seconds, at that point I pretended it was a really really huge... I'll leave it to you to figure it out. Anyways, I don't know why schools dump money into trophies made of fake plastic and (maybe) fake marble decorated up to look fancy.  Here's an idea for these schools- Instead of spending money on trophies that will just sit and gather dust, and are really a pain to carry home, they should give the students cash money equal to the value of the trophies that they would have received.  It certainly would give students an incentive to do well in school, since the amount of money they would receive would directly correlate with their performance in class and the number of awards they would get. Tell me what you think of that idea in the comments. Thanks.

Posted by DJ Radio 8 years ago

Carbon emissions still increasing despite recession

With the whole economic kerfuffle going on you would've thought that there would be less carbon going up into the air. New studies show that emissions continue to ride, however. The data is collected and analyzed by scientists from the Norwegian Polar Institute and Stockholm University. Researchers found that during the first two weeks of March, the concentration of carbon dioxide in the atmosphere rose to 393.71 parts per million (ppm), up from 393.17 ppm during the same period last year. John Stroem, a scientist with the Norwegian Polar Institute, told Reuters that looking back at data gathered since the 1980s, the increase in carbon concentration levels seems to be accelerating. Carbon Emissions at All-Time High Despite Economic Slowdown

Posted by fungus amungus 8 years ago

Knex gun projectile propulsion ideas

So I'm looking for stuff beyond what has already been done. Pin guns are everywhere, slingshots are yet again pretty common, hammer guns have been made but don't have the same performance as the others, and then you have "rail"guns which have a shuttle that works similarly to a pin, but can have the track extended. We really need some new ideas here. I specifically do for my current gun as I have a wicked cool loading mech, but absolutely no propulsion mech and limited space to fit it in. Anyone have ideas that are completely different? If you suggest the following, because they have been done before, please try and make a mech that makes it more innovative still: deconstruction magazine multi band ratchet (multi shot slingshot: if anyone comes up with a magazine to replace of bands, kudos! Plz post dat ***!) a hammer gun that gets some f-ing range for once (we're talking 35-40+ ft without needing glued parts) Some ideas I've come up with that I haven't seen (and haven't made either...) are: enclosed trebuchet (probably spelt wrong, but google wanted me to say "Bucharest" so I'm just going to leave it as is) (an arm picks up a round at the back of it's arc, then comes forward like a hammer but doesn't rely on impact for round firing but acceleration instead) newton's compound cradle: a pin comes forward and hits a shuttle out of a catch, with that shuttle being pulled forward by bands so you have the impact acceleration, then even more from the other bands switchback: a pin comes towards the user, hits the bottom of a lever (hammer) which comes forward and hits the round If you come up with others, or mechs for these, please comment with your idea! Thanks, and let the innovation continue :)

Posted by Dreamwave 3 years ago

Human Electric Hybrid Vehicle

The HE Human Electric Hybrid Vehicle It looks like an interesting concept car. Although, it might be hard to find somebody who wants to pedal it. I really like the solar panels on top, and how on the downhill, it charges a capacitor for energy.This HE Human Electric Hybrid Vehicle concept uses the power of your muscles as well electricity stored in the batteries. It allows smooth and constant velocity both uphill (with the help of the electric motor), as well as downhill (when the wheel acts as a generator and charges the batteries). The vehicle can turn 360 degrees maintaining stability all the time. Additional power is acquired from photovoltaic placed on top of the vehicle as well as during de-acceleration from regenerative braking. Elderly and handicapped people that are unable to provide enough kinetic energy can also charge the batteries directly from the grid.

Posted by Brennn10 10 years ago