The traditional hydrofoil installation method requires 4 drilled holes in the engine’s cavitation plate.

All two-piece hydrofoils and all one-piece hydrofoils without StingRay’s patented, built-in slot have to utilize this installation method.

StingRay Hydrofoils Utilizing 4-Drill Installation:

• StingRay AIRO

• StingRay Classic, Junior

• StingRay Classic, Senior

Installation Process: 4-Drill

Installing a hydrofoil with 4-Drill Installation will require 4 holes to be drilled into the engine’s cavitation plate. We recommend utilizing a cordless drill with the appropriate size drill bit which will depend on which StingRay Hydrofoil is being installed.

To determine the proper hole locations, the hydrofoil must be slid completely onto the engine’s cavitation plate. Once in the proper mounting place, each hole location can be marked on the cavitation plate using the pre-drilled holes in the hydrofoil as a guide.

Once the hole locations have been marked, the drilling can commence! After each hole has been drilled, the hydrofoil can then be slid back on the engine’s cavitation plate so that the holes in the hydrofoil align with the drilled holes in the cavitation plate. Hardware is included in each package to properly secure the hydrofoil to the engine.

Installation Process: 2-Drill

Installing a hydrofoil with 2-Drill Installation will only require 2 holes to be drilled into the engine’s cavitation plate. We recommend utilizing a cordless drill with the appropriate size drill bit which will depend on which StingRay Hydrofoil is being installed.

To determine the proper hole locations, the hydrofoil must be slid completely onto the engine’s cavitation plate. Once in the proper mounting place, each hole location can be marked on the cavitation plate using the pre-drilled holes in the hydrofoil as a guide.

Once the hole locations have been marked, the drilling can commence! After each hole has been drilled, the hydrofoil can then be slid back on the engine’s cavitation plate so that the holes in the hydrofoil align with the drilled holes in the cavitation plate. Hardware is included in each package to properly secure the hydrofoil to the engine.

This StingRay-Patented hydrofoil installation method requires zero drilled holes in the engine’s cavitation plate.

Only one-piece hydrofoils with StingRay’s patented, built-in slot are able to utilize this installation method.

StingRay Hydrofoils Utilizing NO-Drill Installation:

• StingRay HyperFoil 500 (Also features NO-Drill)

• StingRay Stinger (Also features NO-Drill)

• StingRay StarFire (Also features NO-Drill)

• StingRay XRIII, Junior

• StingRay XRIII, Senior

Installation Process: NO-Drill

Installing a hydrofoil with NO-Drill Installation will require zero holes to be drilled into the engine’s cavitation plate! There are two types of NO-Drill Installation methods with certain StingRay Hydrofoil models requiring usage of one method or the other. The first method utilizes set screws, while the second method utilizes the torque tab / sacrificial anode to secure the hydrofoil to the engine.

If the StingRay Hydrofoil model requires the set screw method to be used, the hydrofoil is slid completely on to the engine’s cavitation plate. Once in place set screws are then installed in the pre-threaded inserts on each side of the hydrofoil. The set screws engage the edge of the cavitation plate and secure the hydrofoil to the engine without any holes needing to be drilled.

If the StingRay Hydrofoil model requires the use of the torque tab or sacrificial anode, the sacrificial anode or torque tab is removed from the underside of the cavitation plate. The included red washer is then placed up into the empty cavity created by the removal of the sacrificial anode or torque tab. Once the red washer is in place the hydrofoil is then slid completely on to the cavitation plate so that the red washer is captured. Once the hydrofoil is in place, the sacrificial anode or torque tab is re-installed so that the hydrofoil is secured tightly to the engine.