Tin Can Stirling Engine Plans... It really works! Now you can build this amazing engine for less than $20 (including plans). The plans took 10 times longer to write than the actual engine took to build! Get the detailed 12 page plans with illustrations now!!!

Free Tin Can Stirling Engine Plans

HK1 - a fully closed-cycle engine!
Don't throw away that tin can! Built with a soldering iron and less than $10 worth of parts, the HK-1 Stirling engine is fun to build.

Download
free ebook

-or-

Plans by mail $12:

HK2 - Upright cylinder model
HK-2 Plans not available but it can be built using the same techniques.

HK3 - Stirling Fan

HK-3
Solar Powered Fan
This engine has a complex lever arrangement to make use of a rubber diaphragm instead of a piston. The blades are very sharp and dangerous so I have not published the plans.

If you have any homebuilt model engine pictures of your own, please send them in!

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HK4
Transparent engine fail

"Amazingly simple model stirling engine plans! Other stirling engine plans may require you to have access to a machine shop. These engines are easily made from tin cans using a soldering iron and simple hand tools."

Build this excellent teaching aid and science fair project today!

Download free ebook or order plans by mail.

Stirling is the correct spelling, by the way. I used to think they were spelled "sterling engines." (I could probably get away with calling my engines sterling engines because I lived near the town of Sterling, Alaska.) Nevertheless, Stirling engines are named after their inventor, Robert Stirling.

Some information sources out there confuse ordinary heat engines with stirling engines. Stirling engines, unlike other heat engines, use a regenerator, which recycles internalenergy (heat) many times. Feel free to browse the illustrations, but the best way to learn how stirling engines work is to build one!

How does it work? View a
larger animated illustration.


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What I like about Stirling engines:

Double-action piston: It is a true one-stroke engine, since the piston both pushes and pulls, delivering smooth power on every stroke. A car engine, on the other hand, is a 4-stroke (or, in rare cases, a 2-stroke) engine. It only delivers rough, explosive power on every 4th stroke. As a result, car engines wear out much quicker and produce more noise.

Simple design: There are no spark plugs, coils, wire, points, injectors, valves, camshafts, oil sump, pumps, filters, carburetor, mufflers or timing belts/gears to wear out.

Efficiency: With modern designs and materials up to the maximum theoretical thermodynamic efficiency is possible because of the way heat is recycled many times inside the engine instead of used once and thrown away as in conventional engines.

They will run on almost any fuel: Power may be the heat of a candle or concentrated sunlight. Some carefully-built models can even run on the heat from warm hands. They will also run on chemical processes that produce cold instead of heat. I was able to run the HK1 at great speed on liquid nitrogen until the oil became hard and brittle (next time I'll use graphite).

Quiet running: At maximum power all that can be heard is slight whirring or clanking and only then if the bearings are loose. I've witnessed engines that run totally silent and are even compensated for vibration.

Safety: Stirling engines are probably the safest engine to work with. They can't explode like steam engines and the models on this page don't really put out enough power to injur anyone. I suppose sunburn is possibble (when setting up a solar engine) and solering irons are hot. Use adult supervision!

Innovative potential: Old-style stirling engines did not perform nearly as well as their internal combustion cousins. Their low power-to-weight and power-to-size ratios made them unreasonable candidates for automotive power plants. There were a few attempts at powering automobiles with stirling engines but consumers wanted more 'pep'. Stirling engines can often take several minutes to warm up & deliver useful power. With space-age materials, however, the stirling engine is freed from these limitations. Stirling HEV's may be the transportation of the future..

Download free ebook or order plans by mail.

Pay with PayPal, Bitcoin, or credit card.

Send checks for $12 s&h to:

Henry Kroll
PO Box 12885
Everett, WA 98206

Phone 41-HENRY-KR0 (414-367-9570)

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This Stirling and Hot Air Engine Ring site owned by Hank Kroll.
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Recent comments:

"My compliments to the inventor of this sublime device!"
"Thank you so much for the plans. This is wonderful!"
"You have gone out of your way this time. These plans are great!"
"I like the new plans page. It prints out well now."
"I am going to have fun with this."

"Thank you so very much. You have helped me to create my own stirling engine and get first place in my science fair. Not only did it give me first place but some extra credit points too!! Thanks again. You've been a big help!" -- Jason K.

"Thank you for sending me the address: After some more working around I finally
got PayPal to do its thing. received plans and built the engine. Works OK I
used a "S.O.S" pad as the semi porous differentiator. It is green and did not
have the sponge part. I attempted to burn the pad and got no bad fumes it
resisted flame and did not melt into a ball. After many sessions I opened the
can and my pad was still in pristine condition. I used a "Top-Flight" 9" prop
instead of the tin can lid. Replacing the solder blob with a penny 3/4 of the
way out on the opposing blade. It really takes a well balanced engine to work
on the larger size additionally I used a 1/2" plastic rod instead of using
either aluminum or steel for the power piston. I also added height to the unit
to accommodate the longer swing of the prop blade. J.B. 4 minute weld will take
the heat up to 300 degrees and sets up fast. If I were trying it again I would
try a much smaller prop and weight. Greater stress on making sure the center of
the piston and the center of the crank shaft are aligned would be nice in the
documentation." -- J.P.

"I have two pairs of students (gifted 10th grade) using the plans to
try to make engines. We got the plans and we have most if not all of
the materials. It is nice the way the 1/2" aluminum rod fits into the
brass tubing. I really appreciate that we could get a design that does
not require machining." --D.C.

Try my new 3D online graphing calculator: