I've read the article about grinds on Wikipedia to try to sort things better:



So according to wikipedia, a true flat grind would be like no. 2 and would taper all the way from the spine to the edge of both sides, without a secondary bevel and it seems to be rare. I think the Grohman flat grind is actually a no. 2 combined with a secondary bevel (no. 5) to add resilience. So my guess is that it could probably indeed weaken the blade slightly.

If I understand correctly, the Mora knives have a Sabre grind (no. 3) so is Ray Mears' "Woodlore" knife BTW. This is the one I'm talking about that will make nice shavings (like a double chisel) and is easier to sharpen. Is this correct?

Frankie