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Old 3rd August 2016, 10:49 PM   #1
Jerseyman
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Hi Marius - I'd like to comment briefly on the tangential discussion regarding stiff versus flexible blades. I think I have to respectfully disagree with you.

Whether the blade is stiff or flexible you will still cut with the edge. If the blow is blocked then the contact presumably will be made with the edge. I'm not an engineer so don't have the terminology to describe this well I'm afraid, but the energy of the impact will be transmitted edge-to-edge through the blade - not flat to flat.

No matter how flexible a blade is, it is completely rigid in the edge-to-edge plane. So logically there should be little difference in the energy of the impact and its transmission into the attacker's arm, other than that caused by the blade being lighter.

Indeed, if the flexible blade had the effect you describe it would actually minimise the percussive power of the blow reducing its effect as a weapon.

If you were describing an angled deflection strike rather than a completely perpendicular one I could see some of what you're describing - but then you'd be minimising the effectiveness of the blow it seems to me as the blade would want to flex away from the target greatly reducing the power of the impact. Would that logically be a choice one would make?

Bear in mind also that the fixed grip on the forearm would dictate a different positional use of the body in creating the strikes - so the impact of a blocked blow would be absorbed in the body slightly differently, and I would suggest, more efficiently - less likely to create the potential damage you describe.

Having worked with flexible blades a couple of times I can tell you that the energetic rebound through the weapon is as strong as a stiff blade but transmits with what I can only describe as an odd 'wobble' effect which can momentarily adjust your balance more strongly than the impact of a stiff blade. Primarily because of the randomness of the effect, so it can't be completely planned for.

Another thought regarding flexibility - in my experience, very often the longer the blade the more flexible it appears (or perhaps is) as its own weight causes it to bend. Outside my field of knowledge, but perhaps there's a correlation between flexibility-length-poorer quality steel? Which might be pertinent to the local v. imported blade debate perhaps?

In all of this I am of course talking about period weaponry, not the modern items produced for demonstration/performance.

Hi Jim - maybe one might draw parallels in the sweeping slashing actions to the Germanic doppelhander fighting styles?

Happy to have any of my assertions proved wrong or point out if I've misunderstood anything - just my tuppence...
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Old 3rd August 2016, 11:56 PM   #2
Jim McDougall
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Hi Jens,
Very well noted on the 'priming' of warriors before battle, and this seems always to have been the case where sometimes simply adrenalin is not enough, at least at the outset.

Jerseyman, thank you so much for your most interesting and well explained dynamics concerning these blades. It certainly adds perspective to the kind of circumstances which might have brought certain types of blades into favor over others, and the ultimate outcome in their use.

Indeed, the tandem use of two swords, daggers etc. does bring to mind the early fight studies of medieval Europe. It is always interesting to consider the aspects of cross cultural influences as the post exploration period led to colonization of so many continents.

In India, we know that the development of the Hindu basket hilt from the incorporation of the concept of developed hilts of Europe with the already established khanda certainly reflected a physical change in the weapon.
However it does not seem that the styles of swordsmanship changed to adopt European forms.
The longer 'firangi' blades became more of a status symbol and though these carried rapier blades, it does not seem sword to sword fencing became known to the Indians.
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Old 4th August 2016, 07:58 AM   #3
mariusgmioc
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Quote:
Originally Posted by Jerseyman
Hi Marius - I'd like to comment briefly on the tangential discussion regarding stiff versus flexible blades. I think I have to respectfully disagree with you.

Whether the blade is stiff or flexible you will still cut with the edge. If the blow is blocked then the contact presumably will be made with the edge. I'm not an engineer so don't have the terminology to describe this well I'm afraid, but the energy of the impact will be transmitted edge-to-edge through the blade - not flat to flat.

No matter how flexible a blade is, it is completely rigid in the edge-to-edge plane. So logically there should be little difference in the energy of the impact and its transmission into the attacker's arm, other than that caused by the blade being lighter.

Indeed, if the flexible blade had the effect you describe it would actually minimise the percussive power of the blow reducing its effect as a weapon.

If you were describing an angled deflection strike rather than a completely perpendicular one I could see some of what you're describing - but then you'd be minimising the effectiveness of the blow it seems to me as the blade would want to flex away from the target greatly reducing the power of the impact. Would that logically be a choice one would make?
Thank you very much for your observation!

You are right that for a perfectly straight blow the impact forces will be transmitted through the width of the blade, but how many blows are PERFECTLY perpendicular to the target surface in a real battle?! Even the slightest minute inclination would generate a transverse force that will tend to bend the blade. And even for a perfectly straight blow, at the moment of the impact the wielding arm will continue movement and necessarily have to change the angle, and then the blade will bend allowing the arm to continue the movement.

Regarding the relationship between elasticity and length, there is none. Elasticity is an intrinsic property of the material and is independent of the size or shape of the object. However, deformation is dependent on size an shape. So a coin will not bend even if you apply a huge force, but a long stripe made of exactly the same material will bend easily with the lightest force.
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Old 4th August 2016, 08:37 AM   #4
kronckew
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more opinion:

https://www.youtube.com/watch?v=7niTpIW7dEk

https://www.youtube.com/watch?v=l1uo8Y1Mz2c

he discusses flexible blades used in the dancing demos and fruit cuttings. reminds me of shinese dao, the fighting ones have stiff thick blades and the ones used in wushu 'dancing' have very flexible ones, especially near the tips, because they make a cool sound as they wobble & thus enhance the dance.

i have examples of both & yes, if sharpened the wushu one will cut, but i'd rather have the thicker dao if i were in serious need.

Last edited by kronckew; 4th August 2016 at 08:54 AM.
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