Engineering Projects for High School Students: 17 Real Builds

You want to build something. Maybe a teacher asked for a project, maybe a college application has an empty spot, or maybe you just want to make a thing that works.

Then you search, and every list gives you the same eight ideas with no numbers. No cost. No time. No hint about whether it's any good.

So this page gives you the part nobody prints: what each build costs, how long it takes, what grade level it was written for, and what to add so it counts as high school work.

A project counts when you can be wrong

What's the difference between a craft and an engineering project? In a craft, you follow steps and get a result. In an engineering project, you could fail.

Three things turn one into the other.

• A constraint. A budget, a weight limit, a size limit, a deadline. Something that makes the easy answer impossible.

• A measurement. A number, not an opinion. Grams held. Volts produced. Seconds to drain. "It looked clean" is not a measurement.

• A second try. You test, the number disappoints you, you change one thing, you test again. The second attempt is where the engineering lives.

A sixth grader and a senior can build the same water filter. What separates them is the constraint, the measurement, and how many times they rebuilt it. Keep that in your head while you read the list, because it's also how you level up any project here.

Pick yours with three questions

How much can you spend? Most of these cost under $10. Two cost $35 or more. One costs nothing.

How many hours do you have? Real answers below, from the people who wrote the activities. The shortest is 45 minutes. Several take 6 hours spread over four sessions.

What can you get your hands on? A drill, a hot glue gun, a 3D printer, an Arduino. If you don't own it, check your school's shop or makerspace. Many US public libraries lend 3D printer time for free.

One warning about cost. The published numbers are for materials you use up. They don't include reusable gear. An Arduino project might list $0 because the kit gets handed back at the end of class. If you're starting from nothing, the kit is the real cost.

The whole list, with the numbers

Levels come from the people who published each activity. Cost is materials you use up, per group.

Look at the level column. Seven of these are written for grades 9 to 12. Six are written for middle school or below. That gap is the thing no other list tells you.

Structures you can load until they break

Wooden truss bridge on a budget. You design a bridge, build it from dowels, craft sticks and glue, and then load it until it fails.

The good part is the budget. You get a materials cost and you have to hit a span and a load with it, which is the real job. This one is written for grades 11 and 12 and runs about six hours across four sessions, at roughly $35 in wood and glue.

Level it up: run the force math on paper first and predict your failure load, then see how close you got.

Truss destruction test. Same family, different question. You build several truss shapes from popsicle sticks and hot glue, then crush each one under a load and record what broke and when.

Written for grades 9 to 12, about $5, six hours. Level it up: change exactly one variable between trusses, like joint style, so your comparison means something.

Boomilever. This one is a real competition event. You build a cantilever, a structure that sticks out from a wall with nothing under the far end, and it holds a load as far from the wall as the rules allow.

Score comes from how much it holds divided by how much it weighs, so every extra gram hurts. Get the current rules manual before you cut anything, because the specs change every year.

Bridge and Tower, the two events every old list still names, are not on this season's list at all.

Machines that move something

Hydraulic arm. You build a mechanical arm powered by water in syringes, and it has to grab and move a soda can. Three parts to get right: a hand that grips, an arm that lifts, a base that rotates.

It's written for grades 6 to 8, costs $20 to $30, and takes about three hours. Level it up: add a second axis, or measure the force each syringe delivers and explain why the small one moves further.

Shake table and building. You build a shaking platform out of a shoebox, marbles and rubber bands, then build a tower from toothpicks and marshmallows and shake it until it drops. Written for grade 8, about $1.50, under two hours.

It's cheap and genuinely fun. Level it up: time the shaking, count the cycles, and test the same tower with and without cross bracing so you get a number instead of a story.

CO2 dragster. A Technology Student Association event. You design a car, draw it, carve it, and race it on a track powered by a CO2 cartridge, and you turn in documentation with it.

The race is double elimination. Specs and the annual theme come from the current events guide, so start there.

Projects that make their own power

Solar panel angle test. The fastest real project here. You mount a small solar panel, point it at a light at different angles, and measure the current with a multimeter. That's it. Written for grades 9 to 12, about $1, 45 minutes.

Level it up: find the angle that matches your own latitude and test whether the math holds where you live.

Solar water heater. You build a box that catches sunlight, run tubing through it, and heat water. Then you calculate how efficient it was using the specific heat of water, which is the part that makes it high school work. Written for grades 9 to 11, about $10, four hours over four days.

Wind turbine blades. You cut blades from cardboard, mount them, put a fan in front and measure the voltage. Then you change the shape and do it again. Written for grades 5 and 6, about 40 cents, under two hours.

Level it up: this one needs the most work to count. Test blade count, pitch angle and length separately, and hold the wind speed constant, or you're just wiggling cardboard.

Projects that clean or replace a material

Water filter on a budget. You get sand, gravel, charcoal, cotton and coffee filters, plus a fixed budget, and you design a filter that cleans dirty water. Written for grades 3 to 5, about $3, an hour and a half. It is the most recycled project on the internet.

Level it up: stop judging by eye. Measure turbidity, or filter a known salt solution and test conductivity before and after. Give yourself a target number and a cost ceiling.

Glow-in-the-dark bioplastic. You make plastic out of corn starch, water, vinegar and glycerin, mix in phosphorescent powder, and then test how the recipe changes both the glow and the feel of the material.

Written for grades 9 to 12, $4.33, under three hours. No tools, no workshop, nothing sharp. If you live in an apartment and thought engineering was closed to you, this is your project.

Projects that help a person

Smart prosthetic hand. You build a prosthetic finger or hand, then program an Arduino to drive a servo and read pressure from a force sensor.

So the hand moves, and it knows how hard it's squeezing. You test it on an eggshell and a marshmallow, which tells you fast whether your grip control works. Written for grades 9 to 12, six hours.

The published cost is $0 because the electronics kit goes back in the box at the end. Starting from nothing, the kit is what you're paying for.

An e-NABLE hand for a real person. This is the one that isn't a classroom exercise. e-NABLE is a volunteer community of about 40,000 people in more than 100 countries who 3D print hands and arms and give them away.

They estimate 10,000 to 15,000 people have received one. The designs, with names like Raptor and Cyborg Beast, are free to download.

You need a 3D printer, filament and some hardware. A school outside Chicago has reported making around 75 hands in six years.

They went to kids in the United States, Syria and India. You register, you print, you assemble. The community matches devices with the people who need them.

One thing to respect. e-NABLE says a recipient should work with a doctor, a therapist or a prosthetist when using one of these devices. You are making a real object for a real person's body. That's the point. It's also why you follow their process instead of improvising.

Projects that sense and respond

Arduino conductivity probe. You make a probe out of copper and nichrome wire in a pen barrel, wire it into a circuit, and measure how well salt water, sugar water, tap water and distilled water carry current.

Then you read it on an LCD screen. Written for grades 9 to 12, about $5, three hours, and it involves soldering.

Level it up: use it on something real, like runoff after rain, or road salt in a puddle across a week.

Ultrasonic distance product. You wire an ultrasonic sensor to an Arduino, calibrate it, and then design a product around it that solves a problem you pick.

A parking guide. A blind spot alarm. A bin that says when it's full. Written for grades 6 to 8, about $2, just over three hours.

Level it up: the sensor part is middle school. The product part is whatever you make it. Define the problem properly, state the accuracy you need, and prove you hit it.

The project that costs nothing

A CAD design project. If you have no money and no tools, you still have this. Onshape's student plan is free, and you don't even need a school email to sign up.

It's the same professional software companies pay about $1,500 a year for. Autodesk gives students a free year of Fusion, renewable while you're still eligible, and that account unlocks Tinkercad too.

Design something with real constraints. A bracket that has to fit a specific bolt pattern. A phone stand that uses the least material. A part for one of the builds above. Then check your work by printing it, at school or at a library, and finding out what you got wrong.

Engineering CAD is a Science Olympiad event this season. So this path leads somewhere.

One that flies

Water bottle rocket. You fill a 2 liter bottle part way with water, pump air in, and launch it. Then you change how much water is in the bottle and find the ratio that flies highest. NASA publishes the activity for grades 5 to 8, so the build is simple. The optimization is not.

Level it up: measure altitude properly with a tracker or a phone app, run each water level three times, and plot the curve. Add a payload and a recovery system and you've stepped into what the flight events ask for.

Where to take it once it's built

A finished project sitting in your closet does nothing for you. Here's where it can go.

• Science Olympiad. Team based. The build events change every season. This season's list has Boomilever, Electric Vehicle, Mission Possible, Wright Stuff, Hovercraft and Ping-Pong Parachute.

• Technology Student Association. Around 40 high school competitions, including individual ones like CO2 Dragster, Animatronics and Architecture.

• A science and engineering fair. Regional fairs feed the big international one, and engineering projects are judged on their own terms there, not as science experiments.

• Your application. A project you can explain, with numbers and a failure you fixed, is worth more than a longer list of things you joined.

If you like this enough to keep going, look at where an engineering degree leads, and at aerospace engineering summer internships if flight is your thing.

Keep a logbook or the work disappears

Start a notebook the day you start building. Date every entry. Write down what you tried, what the number was, and what you changed.

Judges at the international fair examine the student notebook. That's in the rules. And the rules also cap how long a project can run: no more than 12 months of continuous research, with a hard start date each cycle. So a logbook with dates in it isn't paperwork, it's proof.

It also solves a problem you don't see coming. Six months later someone asks why you picked that blade angle. The honest answer is usually "I don't remember." A notebook remembers for you.

Frequently asked questions

What's a good engineering project for a high school student with no money?

A CAD design project costs nothing, since Onshape is free for students and Autodesk gives students a free year of Fusion. After that, the solar panel angle test is about $1 and the wind turbine blades are about 40 cents.

How long does a high school engineering project take?

The ones here run from 45 minutes to about six hours of build time, usually spread over several sessions. Competition builds like Boomilever or a CO2 dragster take a season, because you keep rebuilding them.

Can I use a project I found online for a science fair?

Yes, but not as it's written. Fairs judge your question, your constraint and your data. Take the build, add a constraint, measure something, and test more than one version.

Do colleges care about engineering projects?

They care about what you can explain. One project you designed, tested, broke and fixed gives you something specific to write about. A list of projects you assembled from kits does not.

What if my project fails?

Then you have a result. A bridge that failed at 12 pounds when you predicted 20 is a real finding, as long as you wrote down what happened and why you think it broke. Fairs and interviews reward that. Pretending it worked is the only wrong answer.