|
|
Post by Dan Davis on Apr 1, 2008 13:04:56 GMT
True but for one thing: a narrow blade causes the target to close back on the blade while a thicker blade with more niku causes the target to open up. Essentially what happens is the top of the target falls backward in the direction of the cut, whereas with a larger niku it actually falls forward ahead of the cut.
While the larger surface area does reduce the overall frictional pressure, the force being applied to the blade increases as the weight of the target falls back and closes.
Your physicist friend and you are correct, the wedging effect does reduce overall contact. This changes the applied force aspect of drag just as the lack of niku does.
The increased surface area does reduce the frictional pressure but it also induces behavior in the target which acts to increase applied force.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 1, 2008 13:31:15 GMT
Dan,
That's really quite brilliant - thankyou.
|
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 19, 2008 17:39:03 GMT
As luck would have it, I ran into a fellow online who has actually been making efforts to bring a Hira Zukuri katana to the production world! Maybe we'll be seeing more of them in the future...
|
|
|
|
Post by randomnobody on Apr 19, 2008 17:53:36 GMT
Details?  |
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 19, 2008 19:33:18 GMT
He has gone to Kris Cutlery and Imperial forge and comissioned custom prototypes from each. He has also comissioned a kobuse folded and stone polished proto from another forge (will not disclose for the sake of his market integrity). I am currenyly working on purchasing one of the Kris hiras. I wish I had a little more money to play around with than I do. ...don't we all though?  |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 19, 2008 20:08:46 GMT
Dan amazing info, how do you make all these things stick in your head? :E.
|
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 20, 2008 1:02:35 GMT
Looks like I just bought one of three custom Kris Cutlery hira-zukuri katanas in existence. Photos and review to come, I imagine.
YAY!!!! ;D
|
|
|
|
Post by randomnobody on Apr 20, 2008 1:59:32 GMT
Where, how much, and any left?  |
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 20, 2008 4:51:33 GMT
An SFI acquaintance. $200 in shirasaya. The other two have been spoken for.  |
|
|
|
Post by randomnobody on Apr 20, 2008 14:37:33 GMT
Blast. I guess I should start asking around for my hira wak, then. I'd hate to steal your thunder with the kat. I'm still eyeing the markets for a naginata naoshi wak; if you find at a decent fixed price (auctions get outrageous ) lemme know. Likewise if you happen to find another kat. ;D |
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 20, 2008 16:34:54 GMT
You talking production or antique? Or either?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 20, 2008 19:40:22 GMT
I'm happy for you slav, after the review make sure you send it to me so I can test it, I promise to send it back after I'm done(fingers crossed) ;D.
|
|
|
|
Post by randomnobody on Apr 20, 2008 21:49:41 GMT
You talking production or antique? Or either? What the heck, we'll go either. Only condition is if I can't afford it, you pick up the difference for me. (kidding, of course) |
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 23, 2008 14:49:36 GMT
It Arrived!!!!!!
After 2 days of waiting, my custom Kris Cutlery Hira-Zukuri competition cutter is finally in my hands! And boy is it...AWESOME!
This thing is a Monster! It is literal ly over a quarter-inch at the mune-machi, and tapers a little toward the kissaki, ending with a nice broad snake-head tip. The blade has some niku, as expected and desired, but not too much.
Despite it's beefiness, the Hira handles a least as well as the Kaze, which is just right for cutting.
Because this blade is 5160, the hamon is faint an only visible under certain lighting, so I am immediately going to try to etch it out a little more.
I couldn't be happier. Photos to come!
|
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 23, 2008 15:02:12 GMT
Here it is:  Forgot to mention that it's in Shirasaya. I'm gonna start an ongoing review in the Sword Review section. |
|
|
|
Post by septofclansinclair on Apr 23, 2008 15:07:50 GMT
Zounds! That's a nice looking blade, Slavia. I'm looking forward to more pictures as you customize!
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 23, 2008 16:22:45 GMT
omg omg omg, slav hurry up with the review!
|
|
slav
Member
Senior Forumite
Katsujin No Ken
Posts: 4,457
|
Post by slav on Apr 23, 2008 16:53:40 GMT
More pics here:
/index.cgi?board=japaneseswords&action=display&thread=4513
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 24, 2008 23:16:47 GMT
For comparison here is an antique hira-zukuri wakizashi (if I've got it right).  |
|
