Speed Cameras

Personally, I'm on the fence on whether or not these are a good idea in the first place. Should people be speeding in the first place? If yes, why? Having a large speed differential with the rest of the traffic can be quite a dangerous situation.... Why am I on the fence? Because we, in addition to the UK, are already an endemic surveillance society (allong with Russia and China) CITE - it's sad :(]. I'm also anti rfid ID (including the new US passports :/)http://www.engadget.com/2007/12/27/angry-drivers-torching-traffic-cameras-in-england/Apparently, the Luddite tradition of machine breaking is alive and well in its country of origin. According to a report, a group calling itself MAD -- or Motorists Against Detection -- have taken to setting autonomous traffic cameras ablaze across the United Kingdom, and are detailing their exploits on a website (of course). The group's "PR" claims they have been active since 2000, and have destroyed over 1000 roadside cameras. Says the group's leader, Capt. Gatso, "The vigilante anti-speed camera group have announced a summer of MADness which will see them target for destruction all speed cameras in the UK. It's now going to be a period of zero tolerance against all speed cameras." The gang of disgruntled drivers also plans a day of action called "National Cover-Up Your Number Plates Day." Guy Fawkes would be proud.Here's a website for the torched camerasI'm interested to hear the opinion of those of you in the UK... Of course, in addition to everyone else.. Opinions on speed cameras?

Topic by trebuchet03   |  last reply


Sailboat Speed Comparisons

Portsmouth Yardstick is a rating system so different boats can race and supposedly the best skipper will win. It's a good way to see how fast different boats go around a triangle course.They've got hundreds of types listed and rated.I've written up some observations illustrated with videos here

Topic by TimAnderson   |  last reply


Increase the speed of an electric motor? Answered

My electric bike, seen here, was built for my senior project. I was limited on motor choice, and had to go with the best I had, an old powerchair motor. After 2 successfull attempts at building an electric bike, I have discovered that it is impossible to go faster that 25 mph with with one of these motors. As you can see on my instructable the bike has 6 speeds, with a top speed of 20mph in first gear. however, when I shift gears, the motor rpm's decrease instead of the speed increasing. I have heard before that it is possible to run an electric motor at higher voltages than it is rated, so I was wondering, if i could add a seperate switch and a "booster battery" of sorts, that as long as I monitered the voltage so as to not let exceed 24 volts, if this would be feasible. My only other option would be to add a second motor in parallel with the first, and on the same drive belt. The first option would be the easiest, if it could work without damaging the motor. Any help would be appreciated. Thanks, iloveairsoftstuff

Question by the mechanical engineer   |  last reply


HELP making a 3 speed bike

How can i make a 3 speed gear change bike, instead of 18 gears i just want three

Topic by maccaorgordon   |  last reply


Taskings S PAB Support for OrigamiAirEnforcer's Paper Airport

Well, OrigamiAirEnforcer's Paper Airport group is just new...

Topic by wat. 


Surface area drag?

Anyone know how to calculate how fast you will fall if you weigh 170 pounds and you have surface area a feet squared (if you wan't to calculate it I am thinking about 14 square feet

Question by jj.inc   |  last reply


automotive starter and dc speed controller? Answered

can I use a 45amp digital dc pwm motor speed controller with an automotive starter? the controller is from quality kits part number :uk1133. or is there another kit  I should be using? thanks

Question by robin67   |  last reply


HELP please ....i am seeking a 3 speed cassette ....HELP...please

I am trying to find a 3 Free wheel cassette like the one below here for my wheel a, i am stuck in a small town and it is so frustrating cause i have no transport "I NEED HELP" My Phone Number 0412991179 Kindest Regards Gordon or Macca

Topic by maccaorgordon   |  last reply


PM-DC motor and its speed control ???

Hi friends,  our team is going to make a trike(tricycle) which runs coz of pedalling and also with an electric motor. we have decided to used PM-DC motor. can anybody please tell us what are the specifications of the motor to be used. also please tell us about the cheapest and easiest mode for speed control of the same. Other details:   Max power of motor allowed=400W Motor is made to run with a power source of a 12V battery. We would also like to know how to charge the battery with the same motor(run as generator) Thank u... 

Question by arjun169   |  last reply


How do you control 2 motors, 4 servos and 2 stepper motors for a RC airplane? Answered

For the upcoming Epilog challenge I was wondering if there is a 4 servo 2 motor controller for a R/C airplane.If there is can you give me the specifications on what to look for? Is there also a way to control 2 stepper motors from the signal from the transmitter, it has to be semi-light, or light enough for a RC airplane. How could a program both the motor/servo control and the stepper controller?

Question by squirt8500   |  last reply


How can I wirelessly access a wind monitor via the internet? Answered

I am going to set up a wind-speed monitor at a local beach for kiteboarding. I currently subscribe to ikitesurf.com, but they don't have a monitor at the beach I want. How can I set it up to the Internet so I can get a live feed of the wind speed on my computer at home (home is quite a ways from the beach, as in about 10 miles)?

Question by Duke Luke   |  last reply


I wanted to know how to make a smelting pot?

I wanted to know how to make a smelting pot to melt different mettle's for projects that I want to do. Also, what type of home object would melt at the fastest speed over coal fire? This process would be used to make miniature figures (dragons, swords, etc)  of which I would be able to sell at a market. I have already tried an air dry clay but it broke when I put it in the fire (I used aluminum for the mettle).

Question by SDPY15   |  last reply


can a front derailleur for a 12-21 speed bike work on a 10 speed?

My front derailleur broke today(SO LAME!!) but i found a new one on amazon pretty cheap, but it says it's for 12-21 speed bikes

Question by .happy.hippie.   |  last reply


Low-tech anemometer that records highest wind speed

I've been tooling for one of these for ages, or how to build one. It has to be low-tech: no electronics, no batteries if at all possible. I want to measure the highest-speed winds per day, not the actual windspeed at that particular moment. I live in a wind-tunnel and I'm curious to know just how strongly it blows My very vague idea was: windsock with a cord attached to the far end gauge with vertical slider, wind speeds marked, sliding part fitted with ratchet system so it can move up freely, but not down again cord on the end of the sock connects to the back of the slider: theory: the harder the wind blows, the higher the end of sock will be lifted, and the higher the slider will be pulled. Each day I'd be able to take the highest reading, then reset the slider back down for the next day I've got a cheap cup anemometer but I've no idea how to use its rotation speed to make measurements of course, marking the gauge accurately would be a bit tricky! Does anyone have any thoughts/tips/suggestions? Thanks! I've been looking vainly for "mechanical anemometers" but usually get the "take four paper cups" type, or the pukka ones at £££ or $$$. it'd have to stay outside all the time, so a battery one wouldn't be much use

Question by HelenaTroy 


can i use 1 speed controller (24v 350w) for x2 24v 350w motors????its for a electric cart?

Im looking to build a electric cart with two 24v 350w motors but im wondering if i can use just one speed controller for it, the speed controller is 24v 350w thanks  james

Question by jbutcher05   |  last reply


what is the best way to increase torqe or speed of a nitro rc car?

I want it to be a little stronger

Question by mclovin7596   |  last reply


so what's everyone riding here?

I think I have close to eleven bikes in my garage right now (sort of unfortunately), though I only really ride three. for road/ commuting, I have a pacific voyager toys-r-us mountain bike that I converted into sort of a timetrialing singlespeed, complete with a shimano 400 crankset, profile aerobars, champion bullhorns, a look carbon fork, alex 700cs with hutchinson tires, and lots of other ridiculous things that don't belong on such a frame. I ride a diamondback venom park bike for bmx which I found at a garage sale for five bucks, not knowing just how good it actually was and my gary fisher bitter has been decommissioned due to a faulty front hub which blew out my axle and almost ruined my fork, so I'm slinging around a specialized rockhopper on the trails whose back wheel I destroyed and as a result, I've replaced it with a wheel off a peice of crap magna my friend left at my house a while back. I've got several others, but these are my ladies. they come and go quite often for me, but that's what happens. so what are you riding?!

Topic by Nkevin90   |  last reply


so what's everyone riding here?

I think I have close to eleven bikes in my garage right now (sort of unfortunately), though I only really ride three. for road/ commuting, I have a pacific voyager toys-r-us mountain bike that I converted into sort of a timetrialing singlespeed, complete with a shimano 400 crankset, profile aerobars, champion bullhorns, a look carbon fork, alex 700cs with hutchinson tires, and lots of other ridiculous things that don't belong on such a frame. I ride a diamondback venom park bike for bmx which I found at a garage sale for five bucks, not knowing just how good it actually was and my gary fisher bitter has been decommissioned due to a faulty front hub which blew out my axle and almost ruined my fork, so I'm slinging around a specialized rockhopper on the trails whose back wheel I destroyed and as a result, I've replaced it with a wheel off a peice of crap magna my friend left at my house a while back. I've got several others, but these are my ladies. they come and go quite often for me, but that's what happens. so what are you riding?!

Topic by Nkevin90   |  last reply


Why do the constituent of white colour have different wavelength?

When white light passes through a prism,it is splitted into its constituents colours due to the difference in the speed of different colours in prism.the colour which has more speed is deviated most(red)and the colour having less speed deviates least(violet).thus,white light is splitted. we know that wavelength is directly proprtional to speed. The question is why the wavelength of different colours differ from each other?and why does the wavelength of red colour is longest and of violet colour is shortest? 

Question by vmkverma   |  last reply


Pulse width modulation dc motor speed control circuit please !!!!?

Hi friends, I need the circuit of pulse wave modulation speed control. - The motor is PMDC motor. - The input voltage is 12V -  The battery used is a 12V lead acid battery which delivers a current of 35A - Thus the power used would be around 400W (420W to be exact) Please give me the circuit stable enough to withstand this high current.... Note: I also found this circuit. " http://www.eleinmec.com/article.asp?28 " can this circiut withstand my requirements... Thank u ......

Question by arjun169   |  last reply


Update to Chosing paintball marker

The original thread kinda died i added lots of videos which should help any one chose a marker.

Topic by i make shooting things   |  last reply


what is a good engine to use in building a high speed go kart? Answered

I need 2 find a good engine 2 use for building a go kart. I would like to know horsepower ratings, and if i should use gasoline or electric engines. If an electric engine, then what type of battery i should use (lead acid, LiFeP, etc..)

Question by Pablo1656   |  last reply


Is a ice creating sled possible?

What I was wondering is if, you could have a sled that could make ice to sled on. This can be divided into multiple questions. 1. Is it possible to have a tank of nitrogen and water in front of a sled, so that it combines nitrogen and water in a mist to create a thin layer of ice in front of the sled? Would there be any major changes to make it plausible? 2. Is there another way to make a thin layer of ice? 3. OR does this whole idea deserve the trashcan? I'm trying to put our heads together for ideas, by posting this question..... So try to look for possible solutions. Thanks, Paul

Question by bethekind   |  last reply


Multiple gears on the crankset only to make a 3 speed bike. Possible? How?

I have a bike with an electric motor on the back wheel. My bike is fixed gear, so it's hard for me to help the motor when pedaling at medium speeds (>20km/h). On the other hand, once I'm out of batteries and I have a hard time going uphill. I would like make my bike a 3 speed bike without messing with the back wheel. Is it possible to have 1 gear at the back and 3 gears at the crankset to make my bike a 3 speed? My idea would be something like a hub gear, but that stays on the crankset instead of the back wheel.

Topic by dkersting   |  last reply


How does one figure out their Estimated Time of Arrival if they know their rate of speed and distance?

When traveling by Automobile, if you know the distance between two points, and your speed, how do you figure out your Estimated Time of Arrival?

Question by ldchev   |  last reply


Powerisers/Jumping Stilts

Powerisers or Jumping Stilts.....They are a specially designed pair of shoes that you wear that have spring-kind-of-things on them. You can jump six feet high with them and run up to 20 mph! Pretty amazing! But my question is if anybody would know how to build them, or where to get them cheap, or what are the spring parts made of? Because the springs have to be under enormous pressure to withstand the bouncing. So if you know any material that would to the same trick please let me know.Here is a link: here

Topic by TeacherOfTheWays   |  last reply


Need some input on boat propulsion

Can someone help me out with some ballpark calculation of propulsion power needed to move a boat? I do have some specific questions: 1. Propeller vs. Jet: Which one will deliver more propulsion given the same amount of power. 2. If it is typical electrical trolling motor type propeller, is there some simple formula to represent relationship of boat speed, power needed (hp), propeller rotation speed, and diameter of the propeller? 3. If it is a jet: Is there a simple formula to represent relationship of boat speed, power needed (hp), boat speed, and GPF of water to move the boat. I know that I am missing a few variables here like boat's weight and its water displacement.  I am trying to keep it simple. Any thoughts and input will be highly appreciated. Thanks.

Topic by kabira   |  last reply



how to use bike gears to control speed of vertical axis windmill for pumping water?

I would like to use bike gears to switch gears eighter clockwise, or counterclockwise on a vertical axis windmill for pumping water. The purpose is to slow down the speed of the spinging rotor or switch it intoa idler gear, to allow the rotor to keep spinging, and to disconnect the water pump, so it wont' be damaged in high winds; Also not to slam the rotor to a sudden stop, by ingageing a brake. I am building this not only for myself, but also my church for them to give away free to needly people around the world. Thank you for any and all help in this matter.

Question by robertbarfield   |  last reply


Vote for my instructable

Please vote for the ping pong prank in the april fool's speed contest.

Topic by bob the builder #1   |  last reply


Hand powered boat propellor? Answered

I am trying to build a boat for a physics project, and i wanted to try building one that used a propellor instead of the usual paddlewheel or oars that other students have used.  I bought a 2-blade trolling propellor from Walmart, and i plan on attaching it to a crankshaft via a 4:1 belt drive ratio (so with every rotation of the crankshaft, the propellor spins 4 times). Two people will be turning the crankshaft , and the boat itself is stocky with a flat bottom and pointed end. Is this even possible, and will it actually get the boat to move at a reasonable speed? ("Reasonable" meaning rowboat-ish speed)  I included a quick sketch of what im talking about, and a picture of the blueprints to the civil war submarine that I got the idea from, just for proof of concept. 

Question by masterbuilder   |  last reply


How do you get the sprockets off of the back wheel of a 10 speed bike? Answered

The opposite side of the wheel came apart easily, even the bearing. It won't turn out. And it won't pull out. Is it pressed in?

Question by fourbrick   |  last reply


What is the best valve to use in a home made paintball gun,in terms of speed and full force?

It needs to send out as much force as once and it must be able to get opened and closed fast

Question by Salesh   |  last reply


Building an electric bike, how can I calculate my top speed and battery life?

I'm in the process of building an electric bike to commute back and forth to school, as well to the store. I plan to mount the motor on a rack above my rear wheel, and re-rout the chain from the peddles to the motor above. I've been looking at this (http://www.monsterscooterparts.com/24vo500wamow1.html) motor, and I hope to power it with this (http://www.monsterscooterparts.com/12-volt-yt12b-bs-scooter-motorcycle-battery.html) battery (will be using two of these). How to I calculate the battery life using this motor, and is there any way I can calculate the max speed? The bike is predicted to weigh aprox 50 pounds, i'm about 160 plus 20-30 pounds of books and the like in my pack. Thanks in advance!

Question by Mr. Geek   |  last reply


Flame-Throwing Wheelchair

With 15-foot flames and a top speed of 20 mph, this is a pretty serious piece of mobility assistance. OK, sure, it's a ridiculous device, but look at the flames! Link

Topic by fungus amungus   |  last reply


How can I steer a skateboard? Answered

I can push off,but the speed will decrease before I can put my pushing foot on the sk8board,so there would b no challenge...Help please.

Question by Aralooloo   |  last reply


jet engines

Hey! i want to built a gas jet engine without the turbocharger! can u help me with combustion chamber and inside shaft ! and one more question! how to convert the power of a jet engine in speed!?

Topic by hreashi   |  last reply


Any idea what bike this is? Answered

I got this bike at a thrift store today for 3 bucks, in this condition, but I found no websites or pictures about it on the internet. Anyone have an idea? It says "Olympian 10-speed," and on the front, "Performance Tested, Shucks"

Question by Hackrtanman   |  last reply


72 volt motorcycle distance

I saw this and i need more distance than 10 miles but still need the speed to do the speed limit, (60). 30 miles at least. and i saw some of the chargers that charge like your ipod and stuff as you go. i was thinking if i could boost the power one of those puts out that would charge the battery. you'd probably need too big of solar panels to charge those batteries. can you give me a circuit? and what do you think, give me ideas or anything. hit me up. Im listening to: Van Morrison - Domino

Topic by Yerboogieman   |  last reply


How to operate a brushless motor (without complex systems)? {Sea Scooter Project} Answered

I'm trying to make a mini "sea doo" sea scooter for under 100usd.  Im wondering if its possible to run a brushless motor with a simple switch rather than a complex arduino based system.   I will probably enclose the project in a 4-6in diameter pvc pipe with end caps and run the propeller shaft through a smaller pipe with 2 bearings on both end to keep water out.  I would prefer to have a hand drill style switch for variable speeds but if that's not possible single speed button will work also.  Also are li-po batteries a good option for this.  

Question by TypeNameHere   |  last reply


How can i be more proficient in traditional karate?

Do you know of any training methods that can help me increase flexibility speed and power? Any scientifically more efficient ways to train?

Question by    |  last reply


Hammerhead Glider Z Prototype coming soon

Hammerhead glider Z Prototype coming soon. Z Prototype vs II # A lot faster than II like in lighting speed. # Heavyer. # Less glider.

Topic by wat.   |  last reply


Sequential Lighting

I am looking to create a string of LED's that can be programed to turn on and off sequentially over 100 meters that can show the speed of a runner over that distance. ex: 100 meters in 9 seconds. any ideas, also re-program the same to different times.

Topic by ScottR148   |  last reply


would this be a good skateboard and area to skateboard?

Today i got into skateboarding agian. im wondering if this is a good skateboard and area to skateboard. my mom thinks she got it at walmart. this was about 2 or 3 years ago. the wheels seem heavy and don't keep spinning. the board seems ok. there is an area as you can see that has grip tap comeing off a bit.  the area. i have enough room to skateboard but i its not long enough for me to get good speed and keep going. once i get good speed i have to stop unless i want to go into the gravel which would hurt. if you can answer this that would be good. (sorry it's so long)

Question by mberg   |  last reply


How to mount a garmin forerunner 305 to my racing kayak so I can see how fast I am moving?

I want to mount my Garmin forerunner 305 to my Kayak so that I can see my boat speed etc.  

Question by david s   |  last reply


What size engine would I need for this aicraft? (details and pictures inclosed)

I am building an R/C extra 300 and am about to buy the engine, but im not so sure what to get. I think I should buy a 30. sized brushless or up engine, by what make should I get. I would like to power it electricly Details: wingspan= 4.5ft Lenth with cowling= 42 inches wieght w/ servos and pushrods but without radio, lipo battery, motor and speed controler. = 1lb 4 oz width (at largest part) 5 inches. Servos: 4.5v 1.5kg torque I would also like to know what speed controler and battey I would need. Thanks Oscar

Question by oscarthompson   |  last reply


Has any one used a down tube friction shifter with a Nexus 7spd internal hub?

I am building an cargo bike, and have a set of down tube shifters and a internal 7 speed Shimano nexus hub. And was wondering if any one had any success or experience with this set up?

Question by sixmillboy   |  last reply


Potato cannon efficiency? Answered

I created a potato cannon that only has straight pieces of PVC.I have seen other designs where the combustion chamber is wrapped around 180 degrees with two elbow pieces thus making the cannon more compact.  Does anyone know which design is more efficient as in terms of launch power and speed?

Question by bobert610   |  last reply


How do I go about making a Lutron 120vac 60hz household dimmer light switch capable to use for 12vdc??

I want to use this switch for examle in my car connect by the accessory or cigarette lighter plug and it will run a 12vdc fan motor i can control cfm/speed.

Question by KrAx   |  last reply


Convert NEUTON lawn mower to outboard motor

 Any thoughts on using a NEUTON lawn mower (36 Volt) to run an outboard motor? 1. Modding NEUTON to variable speed & reverse.  2. Remove engine from outboard.  3. adapt NEUTON motor to outboard shaft.  (The Neuton has the charging, easy battery removal/switching, circuitry)..... Thanks,  Jed

Topic by tabjed