Half speed of our Mk4 Meccano stirling engine driving a merry go round

Our Mk4 Meccano stirling engine, this one is a twin cylinder unit using the 'Airpot' 'free sample' piston any cylinder set. Google 'airpot' for more data. The Mk4 Stirling engine - built from Meccano, various tin cans, and two graphite pistons running inside glass cylinders, sleeved in black plastic - the 'Airpot' units. Stirling as in Stirling engine is spelt Stirling not Sterling. For the technically minded, the displacer is 6cm diameter by 2.5cm stroke, and the piston is 1.6 cm diameter by 4cm stroke. The displacer is in an air tight chamber and is moved up and down, by a thin wire passing through a seal made of silicone bathroom sealant. This moves 'displaces' a trapped volume of air from the 'hot end' heated by a tea light candle sized flame and the 'cold end' which is at room temperature and back again, this causes the air to expand and contract, pulling and pushing on the piston, driving the engine. The Flexi balance springs are made using a new type of ultra thin springy strip that Meccano new include in some of their sets. The displacers are allowed to 'land' at each end of their travel, this gives maximum performance, it also results in that lovely sound! The Video was taken in wide screen format - don't know how to get wide screen to play properly on Youtube - maybe it will sort its self out. Check out our MK5 and other engines here on Youtube. The Merry-go-round was built by the youngsters seen in the background. ... https://www.youtube.com/watch?v=gEGSu2cFhC0