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DjuiinoStar

DjuiinoStar Most Classical Low Temperature Stirling Engine, Unique Coffee Timer, Best Gift Option, Educational Toy, Steam Engine Model DLTD-303

    • Based on 2,221 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jan 1
Order within 5 hours and 1 minute
Available payment plans shown during checkout

Color: Low Temperature


Features

  • EASY START: just place on a mug of hot water and give it a spin and you're up and running; as long as enough temperature differential maintains, it will keep running like Forrest Gump. People will be shocked and surprised once this little engine start to work. It will definitely be a GREAT CONVERSATION PIECE on your desk.
  • WIDE APPLICATIONS: people bought it for kid's science project, physics/mechanics learning, demonstration on class, etc. It's a well-designed and crafted mechanical toy; great to display basic principle of external combustion engines; fantastic gift for people you love. Many people bought our machines as gift to families, teachers, friends, boyfriends and seldom will our machines failed to cheer them up!
  • MOST CLASSICAL STIRLING ENGINE: with elegant design and fine workmanship, this is a beautiful piece of art. Many people are satisfied with the fit and finish of our engine.
  • SAFE FOR KIDS: Complies with the applicable regulations and standards under CPSIA and any other acts enforced by CPSC; passed Toxic Elements Test/Flammability Test/Physical and Mechanical Test of ASTM-963 Standard Customer Safety Specification For Toy Safety.
  • We provide free replacement if engine stop working within 365 days. We also provide spare parts free for all our products within 1 year. DjuiinoStar stands behind its products, buy with confidence!

Brand: DjuiinoStar


Theme: Physics


Age Range (Description): Kid


Item Dimensions LxWxH: 4.06 x 4.06 x 4.92 inches


Item Weight: 0.53 Pounds


Product Dimensions: 4.06 x 4.06 x 4.92 inches


Item Weight: 8.5 ounces


Item model number: DLTD-303


Manufacturer recommended age: 13 years and up


Is Discontinued By Manufacturer: No


Manufacturer: DjuiinoStar


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jan 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Pleasing machine
Color: Low Temperature
Concise, well crafted, fairly quiet
Reviewed in the United States on December 1, 2023 by David G Leatham
    • The DLTD 304, my fastest engine, the role of drag
As of this writing, I have six Low Temperature Difference (LTD) "Stirling" engines. Two are "classical" Stirling (CS) engines with two cranks on the flywheel shaft, one for each piston. The other four are magnetically coupled (MC) engines I got this spring. The first MC was for this DLTD 304. Placed over 181 F hot water it spun at 763 RPM. I use an AstroAI infrared thermometer and a Neiko tachometer for these measurements. The engine has ball bearings on the main shaft. (The vendors typically call these "precision" bearings.) Also, it may have less frictional loses because it eliminates one crankshaft and the bushing for its connectiong rod. I should point out that separate measurement runs to find the top speed of a given engine may differ by 50 or so RPM. Also, I have no confidence that two of these engines by the same vendor and model will perfom the same. My particular 304 engine is defective. Djuiino has a replacement offer for defective products. You do not even have to return the defective product. They made good on this, but more on this below. The defect is that the displacer piston in the large cylinder is tilted. Placed over hot water at or below 150 F, on each revolution the high edge hits the upper plate of its cylinder with a loud click, thereby wasting energy and slowing the engine. It requires hotter water to start, needs a harder spin by hand to start, and is noisy at the lower speeds. And it stops running when the water is still hot enough to run my other engines. Nevertheless, by observing this engine at its highest speeds, I answered a question that has bothered me about all the LTD engines: Is the drag force the displacer suffers as it shoves air up and down significantly large? I found the answer by watching the displacer in this 304 engine when it runs at very high speeds. At "ordinary" speeds through air, the drag force on a given object results from three factors: its shape (streamlined or not), its cross sectional area perpendicular to its motion, and the square of its speed. The power required (watts) to drag an object through air is the product of the drag force and its speed. This means that the power needed to move the displacer depends the cube of its speed: twice the speed, 8 times the required power. What I observed for the fast running 304 engine is that its displacer lies on the bottom, jiggling at bit, rather than moving through a sizable stroke. By hardly moving, it also requires hardly any of the power the engine is producing, explaining why it runs so fast. This observation of the displacer in a fast running MC engine has been previously noted by Jay Heyl (February 9, 2019) in an Amazon customer review for another DjuiinoStar MC engine, the DLTD 203 "... the displacer goes into a sort of flutter, rapidly coming slightly off the bottom plate but not getting close to the top plate." His extensive review offers many insights to the 203 engine. He attributes its high speed to the fact that when running fast, the displacer hardly moves at all. Back to the Djuiino guarantee. I notified them that my 304 engine was defective, and that I wanted a replacement,. They responded by offering instead to send me a 203 engine, which lists at a much higher price. I took this offer. I since have noticed that many other customers of DjuiinoStar engines have accepted similar offers. The last two MC engines I purchased are the DLTD 204 and the 602. I have written a review for the MC DLTD 602 in which I explain how it works. I have also written a review for the classical Stirling LT001 LTD engine by SunnyStar in which I examine how this 2 crank engine works. ... show more
Reviewed in the United States on August 6, 2020 by Edward H. Carlson
    • Great science product
Color: Low Temperature
The Stirling engine was easy to set up and is well constructed. It is a great teaching tool. My husband loves it. When an issue came up the seller responded promptly with a solution. I will be happy to work with this seller again.
Reviewed in the United States on September 24, 2023 by abb1e
    • Fun to experiment with
Color: Low Temperature
This external combustion engine is really cool. I took a coffee mug and filled it with warm tap water. Then heated it up for 1 min 45 sec. It ran for 1hr 35 min. I took 3 in one oil and put just a tiny drop of oil on all friction points except for the piston. Very little assembly is required and it is a lot of fun to experiment with to see how long you can get it to work. If you enjoy engines and or science then this little gadget will ring a smile on rainy days or as a conversation piece. ... show more
Reviewed in the United States on May 29, 2023 by Guardrail
    • Clever design and good manufacturing!
Color: Transparent
I bought this as a teaching tool and also because I have always been fascinated with heat engines and in particular the Stirling cycle. This product is excellent for demonstrating the concepts of Carnot efficiency and ideal conditions versus the "real world". This engine in particular is a more palatable presentation of heat engines since it is designed to run on a temperature potential one could likely find on their table or desk! I cannot at this time comment on the customer service because I did not require it. This engine started running as soon as I took it out of the box! There is, however, plenty of documentation and customer service options provided within so I am confident that if I do have a problem I will be able to contact them at the email address provided. It is nice when an Amazon seller gives you the option to contact them directly and offers different avenues of resolution prior to any issue(s). This engine far exceeds my initial expectations and I absolutely have to give it five stars. As mentioned in the heading, the design AND the manufacturing of this product is well beyond sufficient. I have the feeling this engine will be functional well into the future. Considering that this costs less than a new video game and has the potential to send anyone on a course of intellectual curiosity and development, every school should have one of these. This engine holds it's value and much more. One final note: This is a very specialized design for "low temperatures". As such, it is not as robust as other heat engines that require high-energy input. That being said, it is somewhat delicate and should be handled with care! If this engine could have been made significantly more durable then the designer probably would have done that. Think of this device as a pair of forceps in a world of blacksmithing tongs. It does something very special and should be treated accordingly. Basically, don't throw it around or drop it too many times and you will be fine! Thanks! ... show more
Reviewed in the United States on August 10, 2020 by Amazon Customer
    • Quality
Color: Low Temperature
I,ll like if they can provide a source of heat like a lamp to put under the Sterling motor. I use it like a desk gadget
Reviewed in the United States on August 20, 2023 by Rodolfo Valentino

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