Here is my first build for a DIY efoil add-on to my existing slingshot foil and board. This first post will be a bit sparse but in the next week or so I hope to include all the details of the build.
Board: Slingshot Wizard 103L
Foil: Slingshot Hoverglide 90cm mast, Switch Fuselage, Infinity 76cm front wing, 42cm rear wing
Motor: 6384 (I changed the factory bearings with ceramic and put a little bit of conformal coating on some spots in the winding I was worried about shorting as well as filled the cable sheath at the motor connection with marine epoxy to make sure the winding leads at the cable junction wouldn’t short)
Propeller: Propeller King Fold
ESC: Flycolor FlyDragon Lite 150A
Battery: 12S 22AH (2 x 6s 22AH Lipo batteries in series)
Waterpump: 5V 1.3L/min
Buck Converter: 8-60V to 5V 5A
Waterproof box: TICONN Waterproof Electrical Junction Box IP67
Remote: Maytech V2 Fully Waterproof Remote
I also designed and made some custom 3D printed parts to attach the motor, route cables, and a few other minor things. I certainly got a lot of inspiration from folks on this forum and in the next few posts I will attempt to credit everyone correctly!
Attached here is a picture of my setup.
I have taken it out once as of writing this post. It was…fun!! But certainly need to adjust the balance of the setup as it was pitching up extremely strongly with what I would expect is normal foot placement. I was able to easily take off on foil when i sat or stood at the front of the board. It was very silly looking but it worked! However, as you may guess, once I was up foiling but standing so far forward I had much less ability to control the board in turning - at least compared to how I normally do while windsurf/windfoiling.
I am open to all advice on the issue of extreme pitch up as the back of the board drags like a parachute unless I stand at the front. My plan for next step is to move the electrical/battery box to the nose (utilizing the sail mast track to secure it) as it is heavy and will help put some weight forward, as well as adjust the rear wing angle of attack to be neutral or even positive lift (to causing a downward pitch torque to the whole setup.
Thank you to everyone on this forum and I look forward to posting and learning more!
(I will include links to the items I purchased and a repository of the CAD files for the 3D printed parts)