Hi there, i have been working in a intuitive way to calculate the power draw of foils for almost a year and with help from a friend we finally got it to the point in which i think it is worth to share, give it a thy and let me know what you think.
here is the link
The calculator is intended to be used for pump foil, as a few watts make a world of difference, but i believe for e-foil might be useful as well. I have many models of gong v2 as that is the setup i use, if you want more wings, let me know! in that case i will need the surface area, the aspect ratio, the thickness and the maximum chord.
here is an example how can it be used, by comparing a Gong fluid XL with a Curve XXL, similar area, similar AR different profile thickness:
the results, the curve wing has more drag, but also a much wider flying envelope
A similar comparison can be done with wings with different an even thicker wing and different aspect ratios (Gong fluid XL vs Gong Trail L):
The Envelope is now even bigger, for speeds lower than 16.4 Km/h you are better off with the Trail wing, for higher speeds is the fluid more efficient
keep in mind that i am only displaying front wing drag, also the total drag may be 30% to 40% higher depending on the Mast, Fuse and Stab setup