Bit sad to see that Korean (hyeonmugung manufactured? Nomad KTB Kingdom) lose to the second AF tatar. Less GPP but it's slower than the AF tatar?!? How long is that tatar bow? Or did you actually mean Turkish on that picture of the spreadsheet?
Wonder how the other Koreans - songmugung, yeonmugung, taegeuk - of the same draw weight would stack up.
The small grips are hard to do a low wrist hold with... I got a Segye bow with a similar grip and I just built up the grip with paper&glue, then leather. still together after several months.

Thanks for posting those results!

27

(9 replies, posted in New Member Introductions)

Welcome!

I don't know what to tell people who ask why I do thumb draw/Korean bows. Just because I read about it online and it seemed really cool. Or something. Maybe I want to be different. Maybe I want to shoot the way people shot a long time ago. Also Master Kim. And it's relaxing and stuff. It's harder but it'll be great once I can shoot with good accuracy and arrow flight.

500gn is very heavy for a flight arrow, for a Korean bow of that draw weight (standard for broadhead flight though)... that is actually quite amazing if the arrow is that heavy. Means the bow actually stores a decent amount of energy.

Do you shoot with khatra?

Wonder if I could approach 500m with my 50# songmugung  and something like 200grain arrows

29

(2 replies, posted in Technique)

Same

There's some weird thing about pushing the index into the string but not the arrow such that you torque the string

Nice
I think the grip of the black shadow is too small for the bow hand hold I've been shown..
what's the draw weight?

31

(15 replies, posted in Bows)

Nice, so you're doing that anchor in the photo, it's with the arrow touching the upper cheekbone?
Do you khatra?

32

(15 replies, posted in Bows)

Looks great, I think you could draw a bit more, an extra inch or two, up to until the base of the arrowhead is in line with the bow's back. I've been told to always draw to the sangsa (arrowhead base felt with bow hand thumb..) for a consistent draw length. Food for thought: I'm not sure but the bow elbow looks like it may be hyperextended, maybe not rotated enough. Might be hunching the bow shoulder a bit? but only a little..

I'm interested, what spine and length of arrows are you using?

Master Kim also told me that it's fine for the top limb to be a bit big like that. My Nomad KTB might do the same thing.. it definitely does it if I string it applying more pressure to the top limb.

I think it's more a concern to have a stiffer upper limb if shooting 145m, I think it might make the arrow go up more (but not faster, I don't think..)

33

(15 replies, posted in Bows)

Here's some videos of the kind of thing you might wanna try. Hopefully this is all that's wrong with it. You could try to correct it this way, then draw it a bit and see if the tiller goes back again or not..



https://www.youtube.com/watch?v=ebucscQcNrE#t=1m2s this kind of pressing of the limb

https://www.youtube.com/watch?v=y9NJvR76GTs#t=0m48s also here

https://www.youtube.com/watch?v=ebucscQcNrE I guess some of this can be relevant

34

(15 replies, posted in Bows)

Hi
That is a little weird, hopefully there are no problems with it. Have you drawn it to full draw? If you're going to, I'd try to 'heel' the bow a lot so that the bow's drawing pressure is on the lowest part of the grip. - that's what I'l ltry to do with my hornbow that has a significantly weaker limb.. it'd put more of the pressure on the lower limb afaik

Usually, in general (not Korean archery?..) the stiffer limb is the bottom limb, and the top limb has the be a bit weaker. So I think it's better that the weak limb is the top limb in this case..

I think it could be the way you brace it. Especially since it's bamboo, it might have a bit more plasticity or elastic memory (like a hornbow) at the beginning, so you could try to bend the lower limb alone more, on the knee, as if you were trying to balance a hornbow. And when you string it, try to apply equal pressure to both limbs.

I don't think the tiller is too far off at all. Notice any cracks on the bamboo?

35

(4 replies, posted in Technique)

Ah, I see.
I don't know, other than I guess the frontal stance is more like shooting forward while on a horse, and I guess it requires more tightening of back muscles. I think it has certain muscular, posture advantages but may make it a bit harder to be consistent. (I guess techniques that make it easier to handle high draw weight or a cleaner release vs. techniques that are easily repeatable) If the torso isn't rotated as much, the angle I mentioned is greater, which results in allowing the draw arm to be more pulled back and less chance of slaps (which seem a bigger problem if not doing bow torque)... but gives less bone-to-bone from the bow arm to the shoulder, loading the muscles more..
Not sure about leaning forward. At shorter distances it prevents the bow arm from pointing down, thus pushing up on the bow shoulder.. makes a stronger stance, making it easier to draw back heavier draw weights..
at longer distances you can just stand straight and have the bow arm point up, doing the same effect..

36

(4 replies, posted in Technique)

There seems to be plenty of variation with the way different masters say the right way to do things is. sugakji vs amgakji, single vs double hook (draw hand), how much to torque the bow, how much of a 'triangle' there should be between chest and arm (or angle between bow arm line and shoulders line)..
I think Master Heon Ku Kim's feet overlap too. The right foot would be about half a foot forward.. And he was dinging me for leaning forward. We stand straight. Then it's easier to aim higher for the 145m target. I thought more of the force should go for the toes of the feet? I dunno.
Master Heon Ku Kim's stance and draw just looks very strong.. there's something about it

37

(15 replies, posted in Bows)

bonus

https://i.imgur.com/qVdoxhW.jpg

38

(15 replies, posted in Bows)

The hornbowyer Jj Weißnicht did this reproduction of that bow, 60#@32". He estimated the original bow's draw weight at around 100#.

https://i.imgur.com/Z3c5GlH.jpg
https://i.imgur.com/fv9G2jL.jpg
https://i.imgur.com/EK1DAnE.jpg
https://i.imgur.com/1jzyrzr.jpg
https://i.imgur.com/glhTLVb.jpg
https://i.imgur.com/fLrOVn9.jpg
https://i.imgur.com/RqWruIi.jpg
https://i.imgur.com/gVJMgvB.jpg
https://i.imgur.com/uvtdc0o.jpg
https://i.imgur.com/PwOOgeq.jpg
https://i.imgur.com/NbViOkg.jpg
https://i.imgur.com/T6J9WVo.jpg
https://i.imgur.com/YiMJX8F.jpg

Hmm. This + slow motion video??

http://physlets.org/tracker/

Was reading this - https://www.wired.com/2011/06/how-fast- … f-bullets/
Maybe it wouldn't be so accurate. ... ...

40

(9 replies, posted in Thumb Rings)

same

41

(17 replies, posted in Bows)

And yes, total arrow length from center of throat to base joint of middle finger is the approximate minimum I'd recommend for Korean style.

I also found this, from the other thread. With this, I get around 33". (btw, I'm around 6'1" or 6'2".) This puts me at 7.5chi to 8 chi arrows.

https://i.imgur.com/WzXJljr.jpg

42

(5 replies, posted in Notices)

Test

Oh cool.

43

(17 replies, posted in Bows)

This one looks cool too. Rather long.. but for Korean archery, the windfighter above should be very good, similar price.
http://www.ebay.com/itm/AF-Archery-20-5 … HnN3LX2WsQ

44

(8 replies, posted in Arrows)

I would love to have more aluminum shaft choices, with 32" shafts.. wish there was more than just Easton. I'd like to play with stuff between .350" and .800" of deflection.

45

(4 replies, posted in Bows)

Blackrain wrote:

Thanks, sirs. I have another question. Just how FLAT do the surfaces of the horn and the bamboo have to be, to achieve a bond that can withstand the stress of the draw? For instance, I was practicing scraping with two small pieces of wood, which you can think of as being like bamboo and horn. I cannot see any light between the sides of this little "bow" but there is a little wiggle room. If I glued together bow pieces like that, could I expect them to delaminate?


Also, when practicing on two other pieces, I tried making the "horn" piece concave, and the "bamboo" piece convex; a "female to male" type thing. Still, the pieces can wobble a bit even though you can't see light through the side.

You could try Adam Karpowicz's book on hornbow making.. there, the core is a bit rounded and the horn piece is concave. I guess they're fitted with heat somehow.

46

(17 replies, posted in Bows)

I think I'd go with this one over the Genghis Khan, seems to have more flipped tips

https://www.alibowshop.com/blank-rwrlr/ming-kaiyuan

47

(17 replies, posted in Bows)

http://www.merlinarchery.co.uk/kaya-win … ow-50.html

50" should be good to a 32" draw length from the back (7.5 chi arrows)

48

(17 replies, posted in Bows)

I think you'll first have to decide which style you want to practice.

If you happen to live in Southern California, there's master Kim's club. Justin Ma also frequents in SoCal.

Some of the Alibow fiberglass models are good, yet cheap. Like the Turkish if you want to do a shorter draw... or the "Genghis Khan", which should be great if you're gonna do Gao Ying style. But those laminated ones should be fine too..

I got the Segye, it's fine but doesn't come with a proper jum-tong (the big grip stuff). I glued a bunch of paper, wrapped with suede and now it's fine..

The Segye looks the same as that longbowmaker "black shadow" bow (I guess they 'borrowed' the name from MJ system...)

There was another UK site that had firefox or windfighter bows for cheap that should work fine. Probably the best bet..


You should stay below 30lbs for a first. It's always good to have a light bow, even when you become strong enough to pull 100#, if you do, so your first should be light.

I got the 25#@30" Segye, around 30#@32", and it's fast enough to be satisfactory to 50m, I'm sure it'd work fine for hunting small game too.

Arrows are very important too... Alibow seems to measure them from nock throat to tip of point. It's hard to find a proper spine if you're shooting without khatra(bow handle torque), hard to learn a clean release..

There's a few ways to measure arrow length in Korean archery. If you're going with Korean archery, it seems like 8 chi arrows (33.4" nock groove to tip) are the very longest you should use, unless you're a giant.

This way should work well if your armspan isn't long/you're of shorter stature - and it's for a very long draw, almost to your shoulder. It seems like most people doing Korean archery actually draw less than this (relative to their body).

With this method, I get a measurement of around 35", but I use 2ja7.5chi(32.8") arrows and draw 32".

https://www.facebook.com/gungdomaster/p … 2336612046

CTR wrote:

What I will say about that 150 pound longbow is that my ~110#@31" Hwarang should be able to spit a 900 grain arrow at over 200FPS assuming a mere 75% efficiency

That's about 8.2gpp, so... probably..

CTR wrote:

modern carbon/fiberglass composite bows are SIGNIFICANTLY less efficient than their horn sinew composite counterparts

Not sure about that, maybe it depends on several things. The Korean target hornbows seem very overstrained. Wonder if there's any performance numbers..


I have a Nomad 53" and a Songmugung junggung (50" or so).
Their draw weights are very close, I think. I wonder how their performance differs... don't have a chronograph.

I wonder if I break 200fps using my ~47#@32" Song mu gung with the 7 to 8 gpp Korean carbon arrows. I could compare both 7.5x6.0 and 8.0x8.0 arrows. (respecively 347.2 grains and 463 grains, 32.8" and 33.4" arrows)

CTR wrote:

I mean, if cheap were the name of the game, why not just build a ballistic pendulum?

Cheap, *and* accurate?
Interesting...