Model sailboat for teaching?

Hello, I work at a Boy Scout Camp over the summer, and one of the merit badges we teach is Small Boat Sailing.  Most of the merit badge goes smoothly, but kids seem to have a hard time with points of sail.  Our plan is to make a small model to put in a tub of water and use a handheld fan to demonstrate the effect the wind will have on the boat at different angles and sail positions.  Any tips on this?  I tried finding models that were accurate, but they were out of our price range.  I want the sail and mast to be able to rotate smoothly, and the mainsheet to be able to be locked and unlocked.

Question by nlaluzerne   |  last reply


Need help to design mechanical mechanism

Hello everyone, I want to create feeder cart with seperate section, that will be hangin on rails.  Feeder cart will have four positions: First one (First load) will be bottom gates closed, middle gates open to the top. Second (Second load) will  be bottom gates closed, middle gates have to be locked in horizontal position. Third  position (First unload) bottom gates open, middle gates have stay locked. Fourth position (Second unload) bottom gates open and middle gates also open, that stuff drops out. I want ask you advice how to design bottom and middle gates open, closing and locking mechanical mechanism (without any electronical parts). This feeder cart will be operating by one man.  I have created middle gates mechanism, but maybe you have better solution.  I really appreciate for any ideas. Sorry for my english mistakes. English is not my native language. Link to my feeder cart design:  https://cad.onshape.com/documents/9bf2057d221de0e07143093b/w/42b5cff40a9a1fb3bed3cb14/e/cbc213062709ad380b4cb17b

Topic by DonatasD4   |  last reply


how do you make a rocket motor without kno3 or visco fuses? Answered

I have tried a lot of rocket engines with match powder and they have never worked.none of my fuses haver worked either.

Question by watson9194   |  last reply


trebuchet? Answered

I'm thinking about building a 1 meter high (working) model of a trebuchet. does anyone have advice on this, like what can go wrong, which materials, lengths, etc. and what could be used as a projectile? note: i know perfectly what a trebuchet is, and how it works. i just don't have experience with model building.

Question by necropolian   |  last reply


Scientists say: Hit Them Hard!

It had to happen.Scientists from the University of Ottowa have modelled the effects of a classical zombie plague, as part of a model in epidemiology.They looked at what would happen if uninfected humans attempted to cure or quarantine zombies, and the effects of retaliation:We show that only quick, aggressive attacks can stave off the doomsday scenario: the collapse of society as zombies overtake us all.It looks like we might have a need for all those zombie Instructables after all!PDF of the paper, via BBC story.

Topic by Kiteman   |  last reply


i need to make mud!!!!!?

 i need to make mud to put on a model car and im not sure on how

Question by annoyingfeatures   |  last reply


how do you make guncotton?

Im making a cannon model for a school project and want it to have more kick. can someone please help me?

Question by agester400   |  last reply


will this work? - pyrotechnical ideas

I was wondering - What would happen if I lit a book of paper matches on fire? wood matches? How could i use this to start off an explosive reaction? can fire launch a model rocket engine?

Topic by sugg22   |  last reply


bug zapper information?

I am trying to find a high voltage transformer for a Stinger high performance UV 801 bug zapper.  Where can I look?  I am not having any luck searchingt for it under the model number or by looking for volage transformer suppliers.

Question by footcluch   |  last reply


leaf blower runs starts and stops fine butt once turned off it wont go on for a hour

i think it is a model defect because my friend has one with the same problem butt i still want to fix it

Question by mclovin7596   |  last reply


which position should I put with used and new winter tires? Answered

I've bought 2 new snow tires, the same model than the old ones. Should I put them both in front or in the back? I've got a Nissan Sentra 2004 (so, FF)

Question by le-Sid   |  last reply


snapper lawn mower clutch?

Hey i just bought a used snapper lawn mower 28" cut rear engine 8hp and it has what looks like bicycle handlebars and the clutch seems too sensitive it jerks alot and does huge wheelies in the slowest gear even though its cool it gets to be annoying does anyone know how to adjust it and the model number is 28084s if that helps

Question by BIGHAIRYDUDE   |  last reply


Find out (exactly) where your steak comes from

My friend just forwarded me a link to the Bovine Myology and Muscle Profiling website. It's got a pretty impressive 3D visualizer for all the different layers of the cow flesh, an incredibly thorough how-to style video library useful for breaking down a cow, and is simply neat for anyone interested in biology, animals, or just plain weird stuff like this. via benjaneer

Topic by noahw   |  last reply


CAD

Hi ppl, Recently I decided to design my own raft this year for the Guildford raft race. The raft will use pvc piping for floatation and my (and an unsuspecting friend) will sit on two bicycles which will power two paddle wheels. Anyway, long story short i thought it would be a cool idea to model it up in some sort of CAD (maybe as something to send possible sponsors to show what i am going to attempt to do if they give me a load of pvc hehe), and, was wondering what software is best to use? thanks ppl

Topic by drummer ian   |  last reply


Records Ahoy!

'Specialist researchers at the University of Nottingham say they have developed one of the fastest swimsuits in the world.Scientists at NASA tested the fabric using specialised computer modelling technique to track fluid flow.Swimmers testing the new suit have so far broken three world records.The LZR racer suit, manufactured by Speedo, has up to 5% less drag in the water than a previous model produced last year.Jess Sylvester, a swimmer who has been testing the new suit in Nottingham, said she felt "like a rocket" when she wore it."I feel fast just standing out of the pool in the suit."As soon as I hit the water I feel really fast, really streamlined and it just gives me confidence wearing it."Dr Morvan said: "We focus on the hydrodynamics of the swimmer in the pool."Ms Sylvester added the suit was so tight that it stopped muscles "oscillating and vibrating" which caused drag and could slow swimmers down.World records set with the new swimsuit include those by:Australia's Eamon Sullivan, who shaved 0.08 seconds off Alexander Popov's record in the 50m freestyleZimbabwe's Kirsty Coventry who sliced 2/10th of a second off Hungarian Krisztina Egerzegi's record in the 200m backstrokeand American swimmer Natalie Coughlin who broke the 100m backstroke record in 59.21 seconds.BBC storyVideo of the suit in actionOdd Speedo game websiteUniversity of Nottingham Press ReleasePast Olympic row over Speedo suits.

Topic by Kiteman   |  last reply


Which firberglass and resin should I use for a custom paintball stock? Answered

I am building a bullpup stock for my little brothers Tippmann A-5. I have a rough model coming together using pink insulation foam board and some lexan for the trigger group. I obviously need this thing to be strong enough to take some punishment since it will be used in paintball games, but I have never fiberglassed anything before, and I'm clueless as to what kind of sheet/cloth to use and if the resin I use will melt the foam core. Any help is definitely welcomed.

Question by sabre   |  last reply


Bike/bar details?

Does anyone have plans or drawings for a bike/bar (pic below)? My friend and I helped load one of these onto a trailer the other day and I have been wanting one ever since. It has a bar in the middle and 10-16 seats (depending on the model) lining the sides where people sit and pedal and drink. The one we saw had a steering wheel in the middle for the bartender. I have not researched the legality of such a vehicle in my area. I have not been able to find anything online thus far. My friends and I are proficient at machining and welding, I would just need some general dimensions and plans to get started. Can anyone help me out?

Question by churchas   |  last reply


World Studies Project on Steam Power

I'm doing a project for school on Steam power... It's origins, it's applications, the reason it died out, the future...Blah blah blah. Along with that, I will be building some small working models, a hero engine, and a piutt putt boat. I was wondering if anyone had any ideas for a beginner that would look nice and actually move? I have minimal building skills and funds, so i'm really looking for simple ideas. Thanks, James P.S. Any one realize the projectile potential of steam power? Real simple... Empty wine bottle, bit of water in bottle, cork it off...Need something more than tea candles i'd imagine...Could be fun! (I'm scaring my history teacher:D)

Topic by musicalbee2003   |  last reply


Homemade Pressure Washer Answered

Hey guys, I had a lawnmower which broke at the blades, so I thought I'd turn it into a pressure washer. So  I welded up a frame from a old hand trolley and bolted on the engine. While I was looking around for a pump I realized that the engines made for pressure washers cannot be used for mowers. Is this the case the other way round?, Will a pump work on this engine? I'm 100% sure one will fit. Has anyone ever attempted/done this conversion? Thanks in advance!! Chris~ Engine- Briggs n Stratton 550 vertical shaft from mower Pump- http://www.ebay.com.au/itm/PRESSURE-WASHER-PUMP-FITS-TOO-MANY-MODELS-LIST-/320557340892?pt=LH_DefaultDomain_0&hash;=item4aa2b4d8dc 

Question by Chris.Um   |  last reply


Lawn mower

I have a Craftsman Lawn Mower Model 917.377842 with a Honda engine. To make along story short, I made my usual tune up for the season. I had the blade sharpen, changed oil, changed spark plug & put fresh fuel in.  It usually starts with 2 pulls but didn't and found oil in the air filter compartment.  I eventually tipped the wrong way while putting back on the blade. I drained the oil & gas & put fresh in. The oil stopped squirting into the oil compartment but still wouldn't start. I tried cleaning the carb but decided to replace it. It still won't start & now the engine floods with gas. What's going on?  None of this has ever happened. I sure would appreciate any help. I've had this mower for at least 11 yrs & aside from a few minor repairs, it has been great.

Topic by snerge   |  last reply


Adult traing bike.I have an electirc 2 wheeled bike, really do making it into 3or 4 wheeler, as i have poor balance.

As i have said i hace a fairly new electirc 2 whelled bike, it gives me my freedom without been in my wheelchair, but my balance at time is not great. So i would little to put on extra wheels but all we can find is kids training wheels, which are to small and not strong enough. I dont want to damage my new bike to much as it is so new. Had we thought and had more money we would have brought a 3 wheeled model but they were double the price, The motor bit on the bike is at the front, so the back is just like a normal bike Hope you may be able to help

Question by mothergoose66   |  last reply


How do I rewind the cord on a whipper snipper? I want to be able to still bump the centre to release more cord.

 I have an electric whipper snipper [weed whacker / cord trimmer].  The cord ran out and I've bought replacement cord from my local hardware shop, but can't find ANYTHING on the web on how to rewind the cord so that when I bump the centre of the spool the cord will still come out.  I have done an online search for the manufacturer of both the cord and the machine.  The cord manufacturer has a website but nothing on it to show how to use their product!  Even worse, the manufacturer of the machine has NO hits on my Google search (Warrior - an electric model bought from Bunnings) There is an arrow on the spool showing the direction you should wind the cord in, but I read somewhere else online that the arrow shows the direction you should turn the spool when you rewind it, rather than actually winding the cord that way. Someone do an 'ible', please!

Question by Tamaresque   |  last reply


Update on the layered metal weapons/props

Hello to everyone who took the time to read this update/list. So I have not forgotten about my promise to upload the Solidworks files and cutting plans. However that will be taking a backseat to finals until summer break. I will however go ahead and list off the items finished, in progress, on hold, or currently only in Solidworks form. Finished -6in Axe: 3lb head on an oak clad 1/4in steel flat bar about 20in long total -3in Tomahawk/Axe: 1.25lb head on a para cord wrapped 1/4in steel flat bar about 20in long total -27in BoneSplitter: 3.2lb aluminium reinforced steel construction. -18in BoneCracker: 2lb aluminium reinforced steel construction. -18in All steel BoneCracker: 3.5lb steel reinforced steel construction. More square handle and better center of balance than previous version In progress -10in Bearded Axe: 3.25lb head. To be mounted on oak clad 1/4in steel flat bar handles 18in, and 30in long. -10in blade Pugio: Model made of mild steel for practice and training. Needs to have bevels, and fullers ground plus handle and guard mounted. -8in blade Pugio: Model made of mild steel for practice and training. Needs to have concave edges, bevels, and fullers ground plus and guard mounted. On hold -14in Blade tester: Simple test bed modeled after BoneSplitter to test viability of various band saw blades(Metal and Wood cutting) for use as cutting edge for mild steel blade carriers. On hold due to the band saw blades being too hard to drill through. Only existing as Solidworks files --27in Revised BoneSplitter: 4.5lb Aluminium reinforced steel construction. Better center of mass and more square handle than MY           previous version. --37in blade Bastard sword: Aluminium reinforced steel construction. Should be very close in terms of center of balance and stiffness when compared to its hardened steel companions.  --20in blade Stacked steel Gladius: Twin riveted steel support plates with detoothed metal cutting bands saw blade used for striking edges.  --blade Hispaniensis Gladius: Single piece of metal for the blade. --blade Cinquedea: Single piece of metal for blade. Multi fuller blade. --8in blade Pugio curved: Same as other 8in Pugio except for the convex curved dagger tip --14in blade Spear from Fullmetal Alchemist: May upload the variant of this in which the "wings" are separate pieces of metal. --3.25in square Warhammer: 8.5lb head Assembled from 13 1/4in steel plates pinned together. Front is covered in 3/8in spikes poking through a steel striking face to prevent separation of the plates. Back end is a 4in spike. --5.25 square Warhammer: 16.25lb head Assembled from 21 1/4in steel plates pinned together. Front is covered in 3/8in spikes poking through a steel striking face to prevent separation of the plates. Back end is a 4in spike. --Straight edged War Axe: 7lb head Inspired by Ironclad Industries' Riftclaw. Made from 7 1/4in steel plates pinned together. I am aware that the riveted and pinned construction of these items makes them inherently less durable and less corrosion resistant than single piece construction. However I am a college student who is working with mostly scraps and whatever has to be purchased. Since mild steel thick enough to carve the Warhammers or War Axe is not common scrap material around the college's machine shop the only way to economically create them is to use stacked plate construction. As for the BoneSplitter, BoneCracker, and Bastard sword the stacked plate construction is used to both reduce the weight of the item and stiffen it at the same time.  

Topic by tytiger33 


Fallout Pip-Boy Iphone

Hello. I've been coming to this website for some time now and I must say there are some very creative people on here kudos to all of you. Any way my topic is: I'm thinking of making a Fallout 3 Pip-Boy 3000-style case for my Iphone 3G  (when I get one that is) and be able to wear it. I have seen a topic on here that is similar and I've seen a video that someone has already done this but it was made out of the Limited Edition clock and frankly I just can't afford that it costs roughly 90 pounds, just too much for something that I'll be taking apart any way. I was thinking of creating my own Pip-Boy out of a plastic tube, some polystyrene and an old screw case but after a talk with my father Polystyrene just crumble's so that's gone down. Then i though why not make a mold out of plasticene (modeling clay) but how do I go about that?. What is the material I need that will be sturdy enough to keep my phone safe?. Resin wont do nor will fiber glass. Can anyone tell me what is a good compensation for those or will those two work?. Yours sincerely Just Killing Time.

Topic by justkillingtime   |  last reply


I need a TEEPEE cover 18 ft. high by 50+ feet in circumference! I am going to make my own!s How much canvas will I need?

Help, my TEEPEE was destroyed by the last storm. I need a suitable  inexpensive cover for the poles that are 18 ft. 4in.,  tall and has a circumference of 50 ft.+.  TYVEK is no good, too costly, too short, and really rattles in the wind! Anyone got any good ideas out there? The original one cost me a bundle and I don't want to go there again! I wish the Buffalo herd was nearby, good meat and great Teepee covers. I think I was born in the wrong century. I keep honing my Mountain Man skills.  Thanks, as ever, Triumphman (aka Mountain Man)!                                                                                                                                                                                                     *                                                                                                                                                                                                             *                 I have finally come to the conclusion that I have to make my own teepee cover!    I will have to buy some canvas by the yard! Does anyone know how much canvas I will need for an 18 ft. tall by 50 ft. circumference teepee frame ? If the canvas comes in 3 ' width or 5 ' width . I have made a paper half circle teepee model, but the numbers evade me! Thanks.

Question by triumphman   |  last reply


Belarus Tractors-cold weather starting information?

Thank you for taking my question.  I purchased a Belarus tractor model 525 (65 hp. 4wd) new in 1990.  Although the tractor came equipped with glow plugs, they burned out shortly after I purchased the tractor.  I replaced the glow plugs again and they also didn't last long.  I then installed a block heater which heats the water and also a small heater from Wolverine company which actually glues on externally to the bottom of the oil pan.  Now although these products help somewhat, I was wondering if any of my good Instructable friends have had similar problems with these types of tractors and how they eliminated the problem.  The two heater items while they help, require several hours if not overnight to work.  Other than the cold weather starting problem this has been a good solid tractor.  In closing, I know these tractors are made in Belarus/Russia where the temps are far more severe than here in Southeast Missouri so I know there must be a solution.  One last thought, cold weather for these tractors is defined as any temp. below 60 degrees F.  Thanks, Debra Kay  

Question by Debra kay   |  last reply


Brain Doctor Uses Cordless Drill to Remove Tumors

A British doctor is in the news for using a cordless drill, a Bosch model, to drill into patients' heads and remove tumors in a Ukrainian hospital. While cordless drills are fantastic things it's surprising to see brain surgery as one of their uses. Now if only Bosch would put that on the package.Minutes later the team of doctors, including one of Britain's most eminent brain surgeons, begins to break into the skull of their fully conscious patientœ with a £30 Bosch PSR960 handy-man's cordless drill. Amazingly, and despite the low-voltage tool running out of power halfway through the process, Dolishny's operation is a success, with his tumour skilfully excavated at the hands of Henry Marsh.The procedure, captured as part of a documentary to be screened on BBC2 later this month, was a routine triumph for Marsh, who regularly takes time off as a consultant at St George's hospital in south London to travel to Ukraine and save lives despite having access only to primitive tools. Also great is this list of makeshift ideas at the bottom of the article:- In 1995 two doctors on a flight from Hong Kong to Britain operated on a woman with a collapsed lung using a scalpel, a knife and fork and a coathanger to push in a catheter.- In Iraq in 2004, an American medical journalist removed a bullet from a marine's head with a drill used to put up a tent.- In 2003 Aron Ralston, an American climber, cut off his arm with a penknife after it became trapped under a boulder in Utah.- The following year Ines Ramirez Perez, a Mexican, delivered her son by caesarean section with the help of three stiff drinks and a kitchen knife. Linkvia Neatorama

Topic by fungus amungus   |  last reply


DrSimons - Giant Fresnel Lens Deathray: An Experiment in Optics - Universal Laser Cutter Finalist!

To see who won the VersaLaser, read the announcement here.DrSimons was a finalist in the 2008 Instructables and Universal Laser Cutter Contest for:I'm really amazed my instructable has made it to the finalists, as It's only my second one! Not only that, I'm getting a lot of votes (but keep them coming please!!!)If I win the laser cutter, things are really gonna get good around here...I already have dozens of excellent projects that would suddenly become possible, and am only just getting into the DIY scene. That means there are 100s, perhaps 1000s of projects in my future, and with such an excellent way to prototype large designs, make small parts, customize/art-ize everything imaginable, I really can't tell you how many fun, creative projects I'll come up with. I am a huge lover of desktop fabrication, love working with high quality tools, going to be learning how to weld as soon as possible. So please vote for me!!!My vision for the laser cutter:Amazing paper/origami projects like the pop-up pyramid - I am totally into advanced origami like insects and sheets of fish scales3D cardstock topographic mapsCustom parts for innumerable future projectsCustom engraved office supplies, artwork, furniture, cutting boards, cell phones, jewelry, pens, etc....Custom puzzles, chess boards, clocks, car upholstery, artistic lamps, textiles, etc....Laser-cut methods for PCBs (possibly?)High-precision models, mock-ups of designsMathematical shapes (such as parabolas), super-detailed, multi-layered stencilsAnd much...much moreFor those of you who haven't read through the whole instructable, here are some of the highlights:

Topic by DrSimons   |  last reply


where can i buy another firetip 8ft telescopic fish rod?

Hello, 6-7 years ago i went to the melbourne boating camping fishing expo where lots of cheap brand new models (samples) fishing rods were being sold. while there, i bought a telescopic fishing rod, which only now while looking for a replacement have i actually noticed it has writting on it! (because it is on the second section. over the years it has sufferd many damages, including what it got when i first bought it, which was that the top section became jammed in, and even now i cannot remove it, and while trying to undo what i did when i flicked up my rod , i ripped off the second tracer. over the last year i have done too much damage for me to risk using it anymore (it is a beloved sentimental treasure, which i hope to restore when i can), and i dont want a different carbon fiber , i want one the same as this, so i ask, does anyone know where i can find another rod like this? i suspect its made my uglystick, but i cant be sure though it shares the same paintwork pattern. i want to start fishing again now that i have located a hidden fishing spot known as sandy creek, which occasionally gets monster fish at high tides, and usually has decent fish in it always, as opposed to other shore accessed spots around darwin tiwi area. i am thinking of buying a palegic carbon fiber fishing rod, but i really like m old rod, please help! ill give a best answer to anyone who can resolve my problem, or find a lookalike

Question by oldmanbeefjerky   |  last reply


Steampunk Volkswagen anyone?

Dear Fellow Instructable Steampunk aficionados, I'm starting plans for my biggest steampunk project ever... a steampunk Volkswagon Beetle!;-) We haven't bought it yet, but my wife and I are heading to Brazil for the summer, and are planning on buying an old VW Beetle, (or a "Fusca" as they affectionately call them locally), to bum around in a sleepy beach town. These cars were once very popular in Brazil, but have been replaced by far more fuel efficient, and largely ethanol powered cars. So an old Beetle can be had for cheap... And my wife has given me the okay to go ahead and steampunk it out to my hearts delight! My initial plans are for purely cosmetic changes. (I'm not planning on installing a steam-powered engine any time soon, although that would certainly be cool;-) I've seen Jake Von Slatt's photos and videos of his steampunk car project, but I thought I'd check with the folks on Instructables to see if anyone has any suggestions. (And when I say anyone, I put heavy stress on my German steampunk colleagues;-) All suggestions (and photos) are welcome! Please post here... Will keep you posted on my progress. Best, Winged Fist Update: 6/27/12 (An eventful day) Today we became the proud owners of a 1975 Volkswagen Beetle! The body is a bit beaten with a few signs of rust, but I'm told that the engine is sound, the electrical work is good and the tires are pretty new. If all goes as planned, I'll get to drive it for the first time next week, when I arrive in Brazil. (Then let the steampunking begin;-) Today I also became a member of the VWoodies user group on Yahoo. Lots of great pictures and inspiration for modifying an old VW Beetle. And the moderator, Senhor California, has an amazing 70s model Beetle he has completely modified into a Woody, which he keeps in Brazil! (In my opinion it has quite a steampunk flare to it). And not coincidentally, today I received in the mail my Hula Girl bobble dashboard ornament, and my California Pacific VW Parts and Accessories catalog from jbugs.com It's looking like this car is going to take on a steampunk/woody/surfer theme... Update: 7/23/12 Well it's been exactly a month since I posted this query, and I'm proud to report that this project is almost complete! After almost two weeks of non-stop renovating and remodeling, scraping sanding and painting, our quasi-steampunk, faux-woody VW Beetle is nearly finished! There are still a few details to finish, (like getting the driver's door to stay closed when we're driving;-), but other than that I'm very pleased with the way this old bug has turned out! This past weekend, she took her maiden voyage, sporting her new look - to the beach of course. (Praia Linda, in the Lake Region of Rio de Janeiro, in case your interested). The one unsolicited comment we overheard was that she looked like an old armoire... and not in a good way;-) The transformation from a bricklayer's workhouse to a beach woody was a laborious one, but now our '75 Fusca can spend her golden years carting beach chairs, coolers and kayaks instead of hauling bricks and cement;-) I plan to post a full Instructable on this project, but for now, wanted to give those interested a taste of the nearly finished product. (I'm also amazed with how much the finished product resembles the photoshop rendition I created, before I ever laid eyes on the car).

Topic by Winged Fist   |  last reply


Excessive Conservation Wearing Out [noun]...

So... While brushing my teeth - I first rinse my brush, turn the faucet on, brush, then rinse the sink/mouth. Yes, I turn the faucet off while brushing. And if you're counting - that's two on/off cycles per brushing...I've been playing with this tool: http://www1.eere.energy.gov/femp/procurement/eep_faucets_showerheads_calc.htmlAnd I pose an open question for discussion.. But first, my data/research...I'm estimating 3 minutes of use per day - 365 days/year. According to the tool... I use 2190 gallons per year. Lets say that's 5 uses per day (2 for teeth - 1 for bathroom use). The tool seems to estimate an 8.4 year service life - so that's a total of 18396 gallons of water over it's life as a faucet.So If I leave the water on while brushing - that's 3 on/off cycles per day.butIf I turn the water off while brushing - That's 5 on/off cycles per day (40% more cycles).Realistically, a faucet's wear comes from on/off cycles - each use bringing it closer to retirement. So 40% of 8.4 years is 3.4 years.Now... Leaving the faucet on an extra 4 minutes per day (2 minutes per brushing) consumes 2920 gallons of water per year.The difference over 8.4 years is: 30660-18396=12264 gallons. At about $4 per 1000 gallons - that difference is $49.06. BUT, the direct replacement for my faucet (as priced today in home depot to the exact model) is $75. So after 8.4 yearsFaucet remaining on will cost me:$49.06 + $75 = $124.06Faucet being turned off will cost me:$75 + $30(prorated cost of faucet for 3.4 years of wear on a new faucet) = $105Differences:$19.0612,264 gallons of waterThat is to say - due to extra wear on my faucet - it's only marginally more economical to turn my faucet off while brushing my teeth. If I wasn't me, and not able to DIY replace - it very well may be cost effective to leave it on given the cost of a hiring a handy man or plumber...Okay... Now that you've read the above... please discuss your thoughts. I am very much aware of the assumptions I have made (no need to point them out) - just looking for opinions :)UpdateLets turn this discussion on it's head now... As several have pointed out, conserving is more important - bonus as it's close to an economical wash in my fictitious scenario above (it's not 100% real and based on data from the link above and some hefty assumptions).My car uses .3 gallons of gasoline per hour at idle. Lets take a 100% city drive in heavy traffic (my drive yesterday). I was at a complete stop due to traffic lights or traffic for 20 seconds or more a total of 12 times to travel ~10 miles (yes, I freakin timed it). So that's a total of 4 minutes (wow, that worked out nice) of idle time. That time consumes 0.02 gallons of fuel costing me $0.06. If I were to make that commute 5 days a week, twice daily - that's a cost of:10.4 gallons of gasoline$31.2 worth of fuelSo, a new starter for my car costs $130. Typically the motors don't actually die - just the contacts. But lets assume I don't want to fiddle with that and just want to direct replace (corollary to valve washers :D).This means - using my starter an additional 24 times per day - it will take 4.2 years for the fuel savings to pay for a new starter. In 4.2 years - averaging 12,000 miles per year - I will have traveled 50400 miles.Okay - now lets consider the cost of fuel to restart - 24 times.... According to mechanical engineering magazine, a V6 engine used 5 seconds worth of idling gasoline to restart. So - redoing some math to compensate - that's a savings of7.8 gallons of gasoline per year$23.4 per yearTime to recoup 1 starter: 5.6 years (equating to 66000 miles)So, I'm having some problems finding data on starter life cycle - all I have is anecdotal evidence... *My personal car has 115K miles and is ~8 years old - and I've been doing this since I bought the car >2 years ago. *My last car was sold at 98K miles and this was done for a little less than 2 years (the car was 8/9 years old when sold).*My first car had unknown mileage (estimated around 150K), was 10 years old and the engine was killed at stoplights.*My parents own a conversion van (seldom used now) that is 12 years old, 120K miles - did not shut the engine (v8) down at traffic lights.None of the cars above have had their starter go.*Father had a truck that had it's starter replaced around 220K miles - unknown age. That car left us with a blown connecting rod around 300K milesBatteries... Yes, this does put more strain on your battery... I'll go more into that when I can find some better data (more than anecdotal :p)...But, that's to say... It's economically viable to turn off your engine at traffic lights... So much so, it's illegal to idle (over a certain period of time) at traffic lights in some countries...

Topic by trebuchet03   |  last reply