Hi Marius, 
 
Sorry for taking so long to respond - you're absolutely right in your observation, very few strikes will be absolutely perpendicular to the target.  Consequently there will always be some flex in the blade - my doubt resides in the assertion that blades were deliberately made very flexible as a positive asset.   
 
It seems to me that a certain amount of flex is to be desired, but too much flex would be extremely detrimental to the power and accuracy of the attack or its follow-up.  And I assume that historically, various armourers must have made a study of the compromise between stiffness/flexibility, hardness/strength, edge-holding capability etc.   
 
Quite a few antique blades I've handled of generic 'european' sword length seem to be tempered to a moderate flex where the top half of the blade will bend to roughly 30º then snap back to true.  Certainly not all - and I suspect that might be a reflection of function - some blades are obviously designed to be stiffer.  Taking the various British cavalry sabres of the 19C as an example - to my very untutored eyes they seem to get stiffer through the century - perhaps adjusting to the changing role of cavalry?  Or simply the gradual straightening of the design?  I acknowledge that I am speculating about something of which I know little.  I have both a parang nabur and a shotel with moderately stiff blades and a full-length flyssa with a blade that I couldn't bend if I tried.  Is stiffness v. flex down to function or choice? 
 
I seem to recall seeing a tv series on weapons by Mike Loades in which there was a demonstration of cavalrymen cutting cabbages/melons.  The cuts were then shown in extreme slow-motion and the amount of cavitation/flex in what seemed to be very stiff blades was extraordinary.  Which seemed to suggest that no matter how stiff the blade the impact of a strike will have a massive impact on it - at a speed too fast for the eye to follow.  I cannot now recollect which blades they were using.  Unfortunately I can't find that footage anywhere - if anyone else can find it please do post it as it's fascinating.   
 
I'm about to post a single-edged pata on a new thread with a well-tempered blade that bends as I describe above and snaps back to straight.   
 
I guess to finish up, I just don't buy that a very flexible blade is more effective in attack. 
 
Happy to be shown the error of my ways....
		 
		
		
		
		
		
		
		
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