Guillotines chop heads. If you look at the guillotine blade, it is angled, with one side of the blade much higher than the other end. I would think the guillotine blade would be shaped more rectangular.
In: Engineering
It’s a physics thing.
The angled blade means the initial point of contact channels all the same force into a smaller initial contact patch and is cutting less of the neck at virtually every point of the cutting motion of the angled blade than a straight cut would.
You have more cutting blade go through the neck as the hypotenuse (Angled blade) of a triangle is longer the the sides (Straight blade).
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