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~HUN~ wrote:

[...] Korean archers, there is plenty of variation in style.

Actually you're right. I said "most Korean archers" when I should have said "some ...". Clear bias ... :-) ... as I'm more impressed by the very long draw stance, I also collected more photos representing it.

About "jang janggung", as said Bluelake, Kaya makes one (they said me, similar to the KTB, but 52", 4 inches more in length than the KTB, named Wind Fighter [which is also available in 50" : "janggung"]).

I'm trying to obtain from Kaya the detailed features of this bow, and obviously, the maximum safe draw length (maximum draw length that you can use everyday without harming the bow). What is it that prevents the bowyer from giving systematically the information that really matters : the weight of the bow at every draw length and the maximum safe draw length ?

Draw-length is measured from belly to string, this should be from notch of arrow to base of the tip, for a longer point, with power flight is 1,5 cm from base ot the tip.

I have only some incomplete speed measurements, I have to do this more carefully.

If you want to know, for YMG marked 65@28, I got this (max speed, not average):

Easton Powerflight, 353 grains

draw length          draw weight         grains/lbs         speed          KE            stored energy             eficiency
     28”                     61,16 lbs                5,78              236 fps      59,28J               84,08J                    70,50%
     31”                     69,68 lbs                5,05              265 fps      74,75J               107,27J                  69,68%

I made this shooting with thumbring and I observed higher speeds with snap release, up to 15 fps, this is something I must to verify.

Peter, you are right, the 75,5 long SMG is semihorn, I forgot to mention.

Hi,

I'm trying to learn how to use a KTB for 7 months now : self training / thumb ring / self made bamboo arrows/ slow progresses... :-)

I use Thomas Duvernay's book and the numerous videos existing on Youtube, particularly those of "ymjang007".

Does someone know some book or web site (in english, for instance, ...) that explains precisely a technique for the KTB ?

Found interesting hints, but too few explanations, on "ktarchery.com". For instance :
"[...] to apply the correct twist to the bow handle [...]"
"[...] this natural twisting motion [...]"
Someone knows what that means precisely how it is achieved ?

Thanks,
EM

 
They call your bow a toy.
You draw it and the limbs go parallel
They run for cover 
The arrow goes like lightening.
Looks and exclamations of disbelief.

I had a judge (term used loosely) tell me my bow was over drawn. She knew a little more about Korean bows and style when she left me.

WarBow,
I don't know how the thumbring is looked upon where you are, there are quite a few negative views here but having it fly down the range is never going to win you friends  Have you tried a leather one? I find they give more feel.
On the whole, our judges are a great bunch and they've always shown keen interest in the bows and arrows I've used. Most negativity, sadly, comes from the longbow element due to the bow's man made material element (regardless that this is simply to bring hornbow performance without hornbow cost) They seem quite happy to allow bamboo backing on longbows 

Will,
That estimate sounds about right, the 45lb achieved at 28" will feel much lighter than it is