StingRay XRIII has the best hydrodinamic efficiency meant for racing purposes. 
Endowed with Tunnel-Prop technology used on off-shore boats which increases 
thrust decreasing friction factor at minimum. 
StingRay Hydrofoil are the best and the most sold world stabilizeris made of hydrophilic water-absorbing material that eliminates friction. 

StingRay XRIII Hydrofoils: 
Hidden no-drill attachment 
Improved top speed 
Increased thrust enhancement 
On plane up to 50% faster 
Reduced bow rise 
Stops porpoising 
Wipes out cavitation 
Stabilizes the boat eliminating chinewalking 
30-40% Fuel efficiency increase