Flapping foil propulsion 1

This propulsion is said to be more efficient than a propeller.
The magenta arrow indicates the direction of the boat's movement.
The foil moves up down thanks to a slider crank mechanism consisting of the input blue crank shaft and yellow conrods.
The crank shaft also carries a second slider crank mechanism consisting of green cranks and a green conrod. The second slider crank mechanism controls the angle of attack of the foil. The angular offset between the blue and green cranks determines the angle of attack of the foil.
Reverse input rotation to move backward.
This video is made based on the video
https://youtu.be/lI9wk3d8I_Q

Inventor files of this video:
https://www.mediafire.com/file/olm6ghgpffo523y/FlappingFoilPropulsion1Inv.zip/file

Видео Flapping foil propulsion 1 канала thang010146