Bought some new swim/bodysurf fins after the old ones died of finrot, but the short fins lack power Vs the original longer ones. I'm not buying another set so I figure to revise the design.
Basically add more area but minimal length.
The power is in the down kick / stroke so the added area is on top of the current blade because it's upside down when used.
It should have more blade area than the original large fin and the proximity if the twin blades should give it some real squirt !