![Francis](https://i0.wp.com/www.energtrade.com/wp-content/uploads/2019/05/Francis-1.jpg?resize=800%2C534&ssl=1)
Characterized by their shell-shaped inlet conduit and a very particular runner, these turbines well fit heads from 20 to 200 meters and performing very high design point efficiencies (up to 94%).
Each turbine should be calculated accordingly to the site characteristics (head and maximum flow), looking for the optimal combination of rotation speed and overall efficiencies.