put it on a cup of water, waited a minute, flipped the fly-wheel, and away it went for nearly half an hour. Fun little desktop item for the guy who has everything. Well packed so would feel comfortable shipping it as a gift.
my father loves it.
I always had an interest for desk toys and physics. This particular engine has exceeded my expectations. A coffee cup will power the engine for 15 to 20 minutes in my case (a cup in which the engine sits perfectly on of black coffee no creamer or sugar that will lower the temperature). When the engine stops rotating my coffee cup is ready to be consumed. The noise is minimal and bearable.
Low Temperature Stirling Engine Motor Steam Heat Education Model Toy