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Also a good question. I'm happy to hear justification (actual engineering justification, i.e. published papers or textbooks) comparing the deflection of curved Vs straight cantilever beams. The reality is I don't know if there would be any appreciable difference in stiffness. My guess is that it's the cantilever nature of the fork that dominates the stiffness and that humans wants to perceive the curved blade as more compliant because it is literally in an exaggerated deflected shape as you look at it.
Edit: the above assumes all is equal in material stiffness and geometric cross section for straight and curved fork blades, and that the rake is relatively small.
Clarification: I'm using straight fork blades because I think they look nice, no other reasoning
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Cupcakes
jontea
Nicely justified. Is there an argument for curved forks for comfort? Or is that just perceived. Maybe that benefit disappears with the extra strength needed for discs too. Or maybe I've been browsing too much Thorn pdf.