Recurve filet knives (why?)

[Swemek]

I think it's really annoying to sharpen many filet knives, the ones that has a recurve, like the one below. I have old wheels that I have rounded for knifes like this. But is there a reason for this shape on (some) filet knives?

My guess is that the negative curve is there for aesthetics and that the often flexible blade needs some support, which a straight blade wouldn't give?

This must be an issue for other sharpening scenarios and not only on Tormek. I have tormeks diamond wheels and want best possible sharpness on filet knives for obvious reasons.

[Swemek]

Haha I see now that the example wasn't the best. There are filet knives that are worse were the recurve starts further down the blade.