There are some good apps out to help calculate to the depth of your weight. If you can approximate the angle (any angle) at the tip, you can get a relative good depth approximation. You fill in 2 known values (angle and line out) and the app gives all sorts of data.
The app is easy to use. It is just a trig calculator. Magic app.
Here is an on line version similar to the I phone app.
Try it out with different line outs (hypotenuse or c) and top angle B
Approximate depth to weight is a
Right-Angled Triangle Calculator
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