# COMMUNITY

### how do you calculate the horsepower of electric motors? Answered

Asked by loki17 7 years ago

### Is one hp on a engine the same power as an average horse? Answered

Asked by ANDY! 9 years ago

### How many CC should a Moped have?

I am currently working on building a Moped id like to post as an instructable if i manage to finish it. I am currently trying to find an engine for it. The only problem i am having is selecting the correct power. In my state, the legal limit is 2 horsepower 50 cc. However, I am 150 pounds and Id like a little more info on how to choose the correct cc. I dont know what someone my weight would need for power. The speed limit on mopeds here is 30 mph. Thank you for any help!

Asked by trf 7 years ago

### How powerful of a motor do you need to run an alternator? Answered

From questions I have read and step by step’s I have read a question came to my mind. How powerful of a motor do you need to run an alternator? I checked the Delco Remy alternator series from 10SI in 37 Amps, to the 40SI durable brushless model, in 240, 275, and 300 Amps. All their performance charts show rpm’s at the alternator not the motor. The pulley on the crankshaft is considerably larger than the pulley on the alternator, giving you more rpm’s at the alternator than at the motor. All their performance charts show rpm’s from 1200 to 8000 rpm’s. All their performance charts show at 3000 rpm’s you get 13/16ths of max power. The last 5000 rpm’s only gaining 3/16ths of power. The thing is none of the performance charts say the horsepower to drive the alternator. I decided to approach the problem from a different direction Typical alternator efficiencies are in the 54%-60% range. Brushless alternator efficiencies are in the 60% 70% range. A typical 12v 60 Amp alternator produces 720 watts at 55% efficiency. It needs just 1310 watts to drive it or a little under two horsepower at 1492 watts. This does not account for mechanical efficiency of connecting the alternator to the motor. With this in mind a three horsepower motor should drive a 12v 60 Amp alternator. This is just an educated guess but I would like a horsepower chart. 720 watts would do well at charging a battery bank while you sleep; however I could not run my microwave and charge batteries at the same time.

Asked by Josehf Murchison 6 years ago

### Where can I find a 1.5 horsepower motor for a project? Answered

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Asked by piddle01 9 years ago

### Toyota corolla DIY Cold Air Intake

So i have this idea, my car came stock with cold air intake, but i want to take it a little farther and do a Ram air intake (the air gets shoved in the car as you drive) what kind of tubing should i use? i have this plastic kind of dryer tubing and some pipe rings (adjustable) would that work? or should i use metal dryer tubing?

Posted by Yerboogieman 9 years ago

### Where can I get half inch thick steel plate? Answered

I'm making something where I need it to be half an inch thick. Don't ask me why but it's defiantly not tank tracks for my 120 horsepower electric tank that I'm designing.

Asked by bowmaster 8 years ago

### Why do people prefer the predator engine over others?

I wanted to get a Duramax engine for my go-cart seeing it has 16 -18 horsepower yet every video I watch on youtube they have a predator engine with 6.5 horsepower, which is better?

Asked by RubenG81 7 months ago

### Removed intake resonator, now I have a small whine

I removed the intake resonator on my car, now I have a small whine to my engine. I know the resonator takes away noises and stuff, but others have done this and got a low hum, not a whine. I don't like my car sounding like a Ford power steering pump. Why is this?

Posted by Yerboogieman 8 years ago

### How much thrust usally does a 9 inch fan give out ? Answered

How much thrust does a 9 inch fan give out? Also how about a 1.5 feet R/C helicopter. How much horsepower is required to lift a human. How much thrust. If you had a 100lb man and had 101lb thrust how far up in the air would the 100lb person go. Sorry really dont want to do the calculations right now.

Asked by planetroverrobo 5 years ago

### How can I improve the proformance and appearance of my 2011 Mitsubishi Lancer ES without voiding the dealer warranty?

Im looking to improve the appearance, performance, handleing, horsepower, torque and the "get up and go" factor. I cannot make a permenent modification (or one that cant be removed without showing little signs of it) because that would void my dealer bumper to bumper and/or powertrain warranties. I do know things can be done without voiding the warranties that would give me some results, however I dont know what they are. I also cant afford major upgrades due to lack of money. please tell me what, if anything, I can do to put the "street car" edge on my own car

Asked by fastcar123 6 years ago

### lawnmower wont start

I have a pull-lite 3.5 horsepower engine on my used sears mower, I replaced the sparkplug and still no start, I get a flooded carb, could it be the magneto?

Asked by charlie12124444434 8 years ago

### The Motorcycle Of The Future

Hailed as the arrival of the motorcycle of the future the MotoCzysz E1PC electric motorcycle is burning up the track. With a 100 horsepower (continuous) and 250 pound-feet or torque, it's no slouch. Check it out via Wired's Autopia http://www.wired.com/autopia/2010/06/motoczysz-e1pc/

Posted by Culturespy 7 years ago

### Electric Motorcycle batteries

Hi, I have an electric e-motorcycle (Road Runner -several years old) and I need to get new batteries ASAP. Inside it has 2 rechargeable batteries. Does that mean I need to get 2 - 12V batteries, whatever Watts I like, based on however much horsepower I need.

Posted by MielV 5 months ago

### Overpriced Stuff: Electric Motor Speed Controllers

Commercially, speed controllers for electric motors (electric car size) are very expensive, like on here.That page has a controller capable of 144v at 550a peak (about 90 horsepower peak) for \$1250. I just designed a speed controller with parts off of digikey.com for about \$200 that could handle 144v at 690a continuous so it could probably get over 180 horsepower peak.All things considered, their's costs over 10 times as much per amount of power.This seems like a BIG markup. I can understand shipping costs, labor costs, etcetera, but something seems a little messed up here.NOTEI am not sure that the design is quite right, and haven't done it myself, so criticism is good.

Posted by yourcat 9 years ago

### What is the difference between an in line 6 car engine and a v6 car engine in terms of performance? Answered

I currently own a 1989 Mercedes 260 e series and it has a in line 6 engine under the hood. I was wondering what the difference between an in line 6 and a v6 are in terms of performance like efficiency and horsepower.

Asked by bobert610 6 years ago

### Universal motor

After disassembling a hedge trimmer I have obtained a universal motor (meaning it can run on either ac or dc) It has a power rating of 400W, and a label indicates that it has 1/2 horsepower. Does anyone have any ideas as to what to do with it? it's fairly small (15cm X 5cm X 5cm) and in reasonable condition. Thank you for any responses.

Posted by csharpdeveloper 9 years ago

### 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..)

Asked by Pablo1656 8 years ago

### Super basic resource for learning electric motors

I watch an insane amount of YouTube, particularly woodworking, as designing and building furniture is my big passion in life. I have, however, become more and more interested in learning about motors. It has become increasingly obvious to me that literally, every tool in a workshop is simply a motor that turns something. Saws, drills, sanders, planers, jointers, even dust collectors are all nothing more than a motor turning something around and around in a circle.   I just bought a new Table Saw, and during my 6 months of researching, I read all about 1, 2, 3, and even 5 horsepower motors. Single-phase vs. three phase. rpms, 110V vs 120V vs 220 vs 240V etc etc etc... It was all mostly abstract, as I could tell that higher horsepower means "good" and lower horsepower means "less good." But now, I have a lot of projects that I want to build, but I know nothing about motors.  I've been watching a lot of Matthias Wandel on YouTube, and I want to know everything there is to know about motors. Unfortunately, I don't know anything really about electronics at all. But I feel like learning about motors is a great place to start learning. Does anyone have a book or a resource that literally takes things back to motors 101 for 10 year olds?

Posted by Dolmetscher007 11 months ago

### Horsepunk Exhibit

Steampunk may be in love with brassy steam-powered devices, but what about the horses? How would the modern world be if everything was still horse-drawn? That's a question that a group of SVA students tackled and will be showing off in an exhibit in the Long Island Museum in Stony Brook, NY. Can someone please stop by to take some more pics when it opens Feb 2? I'd love to see more of this. Horsepower Exhibit linkvia Core77

Posted by fungus amungus 10 years ago

### Craftsman Tractor Transaxle/Shifting Problems.

Hello, I have a "Craftsman= IC-Gold Series, Horsepower/Over-Head-Valves= 14.5, and the Model # of= (917.270514).  Can anyone tell me how I can get to the "Transaxle", so I could grease it??  It is shifting extremely hard, and trying to mow with it is quite difficult.  I have been searching for a diagram that might show me where/how to get some grease into the transaxle to enable easier shifting of the gears.  Thank You for your time/attention to my inquiry.

Asked by acebird 7 years ago

### how to attach a craftsman lawn mower motor to a bike?

So I got two free craftsman lawn mowers on craigslist (one of them works the other one has parts). i couldnt really find a name or anything so its 6.75 high torch horsepower or something like that on the front. i think this is it, but im not sure. its probably older than this http://www.epinions.com/reviews/Craftsman_6_75_Torque_22_in_Deck_Rear_Bag_Front_Propelled_Lawn_Mower_with_High_Wheels_37646_epiI want to attach it with minimal \$, and welding. any info helps.

Asked by frogsaver 8 years ago

### Students Build Car that Gets 2752.3 MPG

Students at Cal Poly have made a car that gets 2752.3 mpg. It has three wheels and moves one person along at just 30 mph, but it can drive most of the way across the U.S. on one gallon of gas. "The 96 pound car has three wheels, a drag coefficient of 0.12, a top speed of 30 MPH, and a modified 3 horsepower Honda 50cc four-stroke engine. It originally clocked in at 861 MPG and has been continuously tweaked to achieve the mileage we see today." Link

Posted by fungus amungus 8 years ago

### variable frequency drive construction?

Hello i am working on a go kart but instead it will be powered by a 1/3 horsepower split phase AC motor. it operates off 768 watts and i am curious in using a Microcontroller and a high power H bridge to control it. can anyone help me or give me an idea on how to step up 12v dc into 120v dc and then using the H bridge to generate the frequency and also where to find some NPN transistors that can handle it and how to possibly reverse the direction of the motor?

Asked by luig 5 years ago

### How much solar panels and batteries do you need to power a 3/4 HP airconditer? For 3 to 4 hours.

I got a window type 3/4 Horsepower Air Conditoner and the afternoon sun is cooking me up like an oven in my apartment.  I could place a solar panel by my window and use that energy to cool my room.  I work at nights and if can enjoy 3 t0 4 hours of cooling to get some comfortable sleep.  Around 11 noon to 3pm.  It would be bliss.

### I am switching from SLA to NiCad on my e bike. I have a 48v controller, what options do I have? Thanks for having me!

Do I have to have exactly 48v of batts or can I use maybe 2 18v nicads? I was a music major, so when you guys and gals start using formulas to come up with amps, voltage. horsepower it blows me away.  Any information on where I could learn the basics would be appreciated.

Asked by jackdullboy 7 years ago

Okay, so here's the idea.  Inexpensive RaspberryPi computers have lots of horsepower, an SD slot, audio jack, and place to hook a screen...  Why not kludge together your own iPod or even iPad.  Also, slap on one of MIT's cell modules and you've got the iPhone. Sure it might look funky and may even cost more than the real deal, but half the coolness is just to say you did it yourself! (P.S.  Since I just coined the terms piPod, piPhone, and piPad, you've got to send me one if you make it work!  Please?  Pretty please?  Maybe??)

Posted by PS118 5 years ago

### pedal powered tractor

I'm no designer but here's an idea I've been stewing on for some time. I've hunted but not found any designs for a pedal powered tractor. The very early tractors were very large;could to lots of work; but they only had 2 or 3 horsepower. They ran so slow you could count the piston strokes. The designs were simple and they were work horses. Our new high horse powered gas tools often cann't do nearly as much. The old machines used heavy flywheels; slow to start but they kept on rolling. With the improvements we've made in bike gearing systems why not make a pedal powered tractor that could do serious work with that same heavy flywheel technology?

Posted by Michael Fletcher 11 years ago

### I have a DC 130 volt, 2 HP, 17 Amp treadmill motor that I want to use on my wood lathe. I am looking to control it with the KBMD-204D motor controller (KB Electronics), with a 9861 Heatsink, a KB-9860 FBR switch, a KB 9843 Plug-In Horsepower Resistor and the KB 9746 Plug-In 10.0 amp fuse. These wer...

Asked by HilbornJ on Use a Treadmill DC Drive Motor and PWM Speed Controller for Powering Tools 6 days ago

### Help with wiring

I have disassembled an old vacuum cleaner that runs on 240v/5amps/1200w. I wanted to obtain the electric motor that should perform at 1.5 horsepower. As I was taking it apart I forgot how the switch leads were originally configured. I want to give the motor a test run but I don't want to hit the fuse in my house so I was hoping someone can help me plug the switch in the normal configuration. What order do the brown and blue plugs (that comes from wall plug) fit into the switch? And what order do the blue plugs (goes to motor) fit into the switch? A silly question really but I am new to working with electronics.

Posted by Tyoon 5 years ago

This is not a scan of the original book, but the original book converted to text with OCR, and strictly proof read with QC controls. Thus the charts, formulas can be copied and pasted into something else.  www.gutenberg.org/etext/27257   ELECTRICITY FOR THE FARM LIGHT, HEAT AND POWER BY INEXPENSIVE METHODS FROM THE WATER WHEEL OR FARM ENGINE BY FREDERICK IRVING ANDERSON AUTHOR OF "THE FARMER OF TO-MORROW," ETC., ETC. New York THE MACMILLAN COMPANY 1915   PREFACE This book is designed primarily to give the farmer a practical working knowledge of electricity for use a slight, heat, and power on the farm. The electric generator, the dynamo, is explained in detail; and there are chapters on electric transmission and house-wiring, by which the farm mechanic is enabled to install his own plant without the aid and expense of an expert.    With modern appliances, within the means of the average farmer, the generation of electricity, with its unique   conveniences,   becomes   automatic,   provided   some   dependable   source   of   power   is   to   be had—such as a water wheel, gasoline (or other form of internal combustion) engine, or the ordinary windmill. The water wheel is the ideal prime mover for the dynamo in isolated plants. Since water-power is running to waste on tens of   thousands of our   farms throughout   the country,   several chapters are devoted to this phase of the subject: these include descriptions and working diagrams of weirs and other simple devices for measuring the flow of streams; there are tables and formulas by which any one, with a knowledge of simple arithmetic, may determine the power to be had from falling water under given conditions; and in addition, there are diagrams showing in general the method of construction of dams, bulkheads,   races, flumes, etc.,   from materials usually to be found on a farm. The tiny unconsidered brook that waters the farm pasture frequently possesses power enough to supply the farmstead with clean,   cool,   safe   light   in place of   the dangerous,   inconvenient oil   lamp;   a   small   stream capable of developing from twenty-five to fifty horsepower will supply a farmer (at practically no expense beyond the original cost of installation) not only with light, but with power for even the heavier farm operations, as threshing; and in addition will do the washing, ironing, and cooking, and at the same time keep the house warm in the coldest weather. Less than one horsepower of energy will light the farmstead; less than five horsepower of energy will provide light and small power, and take the drudgery out of the kitchen.   For those not fortunate enough to possess water-power which can be developed, there are chapters on the use of the farm gasoline engine and windmill,   in connection with the modern storage battery, as sources of electric current.   www.gutenberg.org/etext/27257

Posted by Lateral Thinker 8 years ago

### Go-ped scooter: How large an engine can be placed on one?

I'm looking for information about replacing the usual 50cc and smaller engines on one of these with something a bit larger. Maybe the 10-15 horsepower range, so say 100-200cc. I've come across videos about people powering manual wheelchairs by attaching a go-ped scooter to it.  I'd like to see about doing this and upping the speed to about 40mph. I'm a large person and could probably use a bit extra power over a stock engine. Also, a four stroke would be preferable to a two stroke. Adding oil to the fuel is a nuisance.  www.youtube.com/watch http://www.youtube.com/watch?v=7nSA_uKpGpY

Posted by Lokisgodhi 7 years ago

I am going to start a small EV project. I have seen that most treadmill motors are 3 to 4hp powerful. I wanted to know weather these motors will be suitable for my project. I am building a small kart capable of carrying maximum 2 persons. Also if they are suitable for my project please can someone suggest me 3 or 4hp treadmill motors on eBay or other sites below 150\$. Also I saw a formula on a site related to power for a vehicle   HP = W(V/234)^3 where HP=horsepower, W=weight in pounds and V=required velocity in MPH. I found this formula on this site (http://www.ajdesigner.com/phphorsepower/horsepower_equation_trap_speed_method_horsepower.php). Is this formula correct.

Asked by flyingdutchmen1659 5 years ago

### What kinda engine would be suitable for a moped bike?

I am looking into making a moped out of my bike to increase fuel efficiency. I am looking to find out where i could find a suitable engine within laws for NH. Around here, According to the DMV a moped or scooter must meet the following restrictions: It must have an engine of 50 cubic centimeters or less. It cannot exceed 30 mph on level terrain. It cannot shift. It cannot exceed two horsepower. As i said, im not sure where to find a suitable engine to meet those criteria that i can scavenge. I am looking to make a chain drive bike not a roller driven due to inneficiency,maintence,and traction of the roller on the wheel being lack. Couldnt find any chain driven conversions on here. If you can offer any information it would be much appreciated.

Asked by trf 7 years ago

### how do i make a 12V electrical motor stronger? Answered

Im trying to make a batteryless die, and im now in the process of wrapping a plastic tube with copper wire, but after 200 times around, ive had enough (i need 2500!!!) so i decided to use a motor to do the hard work (wich would be faster also :D) so, i made a motor thats steadier, added a switch and a 9V battery, but it went to fast, with not enough power, resulting in ALOT of wire used, wich wasnt wrapped tight enough against the tube. so, i tried holding it with my hand to slow it down, but again, its not strong enough to pull the wire on strong enough. so, in a nutshell i need the motor stronger, not faster. like adding more horsepower instead of kilometers/hour...

Asked by godofal 8 years ago

### How to cool an outboard motor without using water?

I am wanting to build a personal ultralight helicopter. First issue here is to find a suitable engine. Outboard motors have the 40+ horsepower I need and can be found pretty cheaply on places like craigslist. One thing I know about these engines is that they use a water pump to suck up water and cool the engine. It is important that this water is present and can the engine can be wrecked if it is run without water for more than a minute or two. Short of including a water tank on this helicopter, do any of you have any practical solutions to keep an engine like this cool? (Just so you know, an "ultralight" helicopter must weigh under 249 pounds without the passenger. In the US, you can fly ultralights without a pilots' license. 40hp outboard motors weigh around 160lbs so I don't have a lot of room for heavy water.)

Asked by 1up 7 years ago

### A Supercar Made Entriely of Wood

Joe Harmon, a product designer, wanted to show that wood isn't a past's material and that it can be used for high precision engineering. So with a couple of friends and a dog, he's buidling a supercar made entirely of wood (oubvisoulsy not the engine). They even made some of the tools they're using, like a loom to weave the wooden composite!" We aren't really all about mission statements around here; too often, they are phoney and superfluous. That said, here is ours. We are building a high-performance, mid-engined supercar from wood composites as a graduate project at North Carolina State University. Wood will be used whereever possible, including the chassis, body, and large percentages of the suspension components and wheels. The car has a target weight of 2500lbs and a power goal of over 600 horsepower. We aren't trying to sell anything; we aren't trying to save the world, and we aren't advocating that everyone should drive a wooden car. This project is a scholastic endeavour in which are simply trying to explore materials, learn, teach, share ideas, and stimulate creativity. This section details who we are and what we are doing. We hope you enjoy checking out what we are working on. "Joe Harmon DesignFlickr Photostream

Posted by lordofthedonuts 9 years ago

I have a Horizon T101-04 treadmill that has a control problem. The motor is definitely good. I suspect that the motor control board is good, and the control panel board is bad. The control will not reset or go into diagnostic mode. I want to replace either the control panel board or the entire control system. The motor is 90V DC. For amperage, the motor label says "19A S6 25%" which has no meaning that I understand, other than perhaps that the maximum amperage is 19. The label says "APMS" rather than "AMPS", and I wonder if the "S6" is supposed to be "SC" for "stall current." All of the characters on the label are very legible. To replace the entire set of controls, I can use an industrial DC motor control, but how much horsepower does the control actually need to be able to provide? I don't think that the one on the treadmill actually provides 19A, and is probably close to 1 HP or so in its capability.  To replace the control panel with something else and keep the existing motor control, what do I need? Do I need some type of complex driver circuit? Does it need feed back from tach sensor to do a good job of keeping the speed steady?  If it will work well, I want a simple control set up like a KB Electronics KBMD-240D to which I will add a safety cut-off switch with a lanyard.

Posted by Ineedacircuit 2 years ago

### Robot Pegasus design possible? Answered

Ok, so I have another idea that will most likely never get anywhere due to my lack of funds/it not being possible.           What if I made a magnetic track somewhat like a maglev and had a robotic pegasus with electromagnets in its feet. It would also be an ornithopter to get it farther than a few inches off the ground. I would have the magnetic track to have it hover a few inches off the ground for about a minute before and after takeoff to make it less likely to crash on landing and give a minute to text the mayor to not worry about any upcoming pegasus sightings above or around town before taking off.           What kind of horsepower engine would I need to power the wings enough to get sufficient lift (at least 15-20 feet)? And would the electromagnet buffer before landing be significant enough to at least lessen the impact so it doesn't maim/kill you if you crash?           The electromagnets don't seem to me like they would work, but it would still be fun just to hover it to show it off without flying up 20-30 feet and worry about falling. Also, would it make it too heavy to fly if I put in an extra motor to make it walk/run so it doesn't have to be flying to move? I don't really expect this to be within my budget, but it would still be cool.

Asked by ALogan97 6 years ago

### Attaching a motor to a bike? Answered

I have an old motor that I'd like to attach to a bike. There are a few things that concern me though that I was hoping some people could clear up for me: 1. I'm wondering if maybe the motor is a bit too powerful for a bike. The motor is a briggs and stratton 4-stroke 3 horsepower 127cc engine that runs at 3600 rpm. It originally came from an old edger. I've read of people fitting bikes with 70cc engines, but nothing this powerful. If it is too powerful, is there any way to rectify that problem? 2. As I see it, there are 2 ways the engine could be attached: by friction to the tires, either front or back, or by chain directly to the front gears.  Ideally, I'd like it attached via chain in this way creating a gearshifting system from the already existent gears on the bike. But can a bike's deraileur handle the power that an engine brings, or would it be too much? 3. Lastly, I plan on using a centrifugal clutch. However, I've had bad experiences with them in the past that made startup of the engines difficult. (mainly due to the fact that the clutch kept engaging even though the engine was off. You could see how during startup of a go-kart, this could be frustrating.) Do you think a new and properly selected clutch would behave that way? Thanks a ton in advance!

Asked by tylervitale 5 years ago

### do i have the right DC motor for a wind turbine?

Hi, ive been using this site for years, first time im posting and its because i think ive bitten off abit more than i can chew but i love projects :) anyway, i have a dc motor i have taken out from an treadmill plugged it into a multimeter n gave it a twist got few volts, all good. what next? i cannot find what i need by looking at the label, it has 2 different horsepowers and also has 4 wires coming out so i dont know what phase it is either it doesnt say RPM and also has 2 different watts (pic included) i understand one is for continious use is that the one i should refer to? :( can someone just prod me in the right direction please? also it has a kind of fan which also spins on the opposite side should i take this off or keep it? and can i use any parts from the rest of the treadmill to help make a charge controller? i was planning on buying 3 aluminium blades around 30" each and wanted more than 2 batteries in my bay, im ordering a slip ring, blocking diode  and dont know what charge controller im going with yet... i have done alot of reading some things just dont seem to specific to me or maybe im just asking dumb obvious questions! any help appreciated

Posted by sharkyali 4 years ago

### Fuel economy of the world's longest in-service ship

The Emma Maersk is the second longest ship in the world, and the longest currently in service. It's so large, it looks photoshopped into any picture it appears. Driving such a large ship requires a lot of power. From Wikipedia:The Emma Maersk is powered by a Wartsila-Sulzer 14RTFLEX96-C engine, currently the world's largest single diesel unit, weighing 2,300 tons and capable of 109,000 horsepower (82 MW). The ship has several features to protect the environment. This includes recycling the exhaust, mixed with fresh air, back into the engine for reuse. This not only increases efficiency by as much as 12% but also reduces engine emissions. Instead of biocides, used by much of the industry to keep barnacles off of the hull, a special silicone-based paint is used. This increases the ship's efficiency by reducing drag while also protecting the ocean from biocides that may leak. The silicone paint covering the part of the hull below the waterline is credited for lowering the water drag enough to save 1200 tons of fuel per year.We started talking about energy consumption after watching a practice version of Saul's upcoming E-Tech Keynote, Energy Literacy, and Dave Culp of Kiteship and Speed Sailing did a back-of-the-envelope MPG calculation for this ship:A few more facts about Emma Maersk:Running at her rated 80 Mw, her main engines burn 14 tons of residual fuel each hour. Annually, that's 97,400 tons of fuel. Her auxiliaries, delivering their full 30 Mw, burn an additional 6.6 tons/hour, for a total fuel burn of 20.6 tons/hour. Given 290 steaming days/year (80% capacity factor, which is conservative), this yields a total annual usage of 143,400 tons or about \$64.5 million in annual fuel costs.Burning 20.6 tons/hour = 6724 gals/hour. At 31 kts/hour, this equals .0046 nautical miles/gallon. At 6076 ft/nautical mile, that's 28 feet/gallon of fuel burned.The 1200 tons saved by her "revolutionary" bottom paint represents a bit less than 1% of this cost, so increases her fuel mileage to 28.2 feet/gallon.Dave concludes:You gotta haul a lot of containers full of \$7 tee shirts to make this profitable.28 feet/gallon!Images from jtashipphoto.dk and Wikipedia.

Posted by ewilhelm 10 years ago