... -reducing device, blades, and installation system etc. Theproduct is characterized by low power (1.5-9KW), low rotate speed (34~85rpm ... cast with PU or glass fibre reinforced plastics and highlighted by light weight, high strength,and good anticorrosion etc. The excellent ... of speed and bladeturbine diameter, the plug-flow capacity increased by 20% or more, along with high reliability flow propeller