Received in a well cushioned box. Only had to use two screws to attach the engine to the base and then screw on the propeller. The propeller hub has a collet type attachment to the drive shaft. That presented a little bit of a problem. You'll need to take a pair of pliers and squeeze it down a bit before sliding it on the shaft so it has a snug fit. Tightening down the prop will finish squeezing the collet into a nice fit. The engine can run in either direction. In one direction, the prop will blow out the flame. In the other direction, the prop will draw the flame forward heating most of the tube. It runs great and makes for a nice little conversation starter.
The package arrived a day before it was expected. All of the parts were already assembled straight out of the box. After a couple days of use, the product works amazingly well and just goes to show how reliable it is. It is beautiful to watch and learn about the physics involved with its function.
This is a work of Art, the masterful engineering and technological excellence is faultless, dispel any doubt and buy this gem as you will experience a very absolute delight as I have, its not a toy that is an understatment .
Love this little Stirling engine. Works as expected and fast shipping!