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You haven't attached a picture

YMG http://goongdo.com/

SMG http://smgung.co.kr/

Hwarangs are just YMG sold under a new name (and higher price)

The ebay bow you linked is YMG (chinese characters on the limb say so), just $290 instead of the $450 Hwarang price

No, it absolutely cannot have the same performance as a real hornbow. Without sinew the bow can't be reflexed as much, which reduces the preloading that gives hornbows their smooth draws. Having horn on the belly doesn't help that. The bow shoots just the same as a carbon, just a wee bit slower because horn is heavier than carbon.

At draw weights lower than ~40 pounds, carbons shoot better because they're lighter and more efficient. At heavier draw weights horn/sinews shoot better because of the energy advantage. Carbon bows with horn bellies shoot with the lower energy of a carbon bow with slightly less efficiency. The main advantage is that it looks good.

Horn/carbon hybrids shoot with 10% less energy than horn/sinews at ~50 pounds

I've been thinking about and researching it because I want to overhaul my bow too. Replace the old cracked birch, redo the bindings (from monofilament to something more natural), grip and the leather wraps on the nocks etc

The traditional method is to store the bark in seawater for a year and boil it just before you stick it on with fish bladder glue. Nowadays they use rubber cement. Karpowicz has the following to say in his book:

In my experience rubbing alcohol evaporates quicker than water... I don't know, will have to experiment

Yeah I asked koreanbow about their Taegeuk 'hornbow' and it isn't really a hornbow, just a fiberglass bow with horn belly. They do sell a real hornbow for $800

Last time, I used a square knot, cut the loose ends short and burned/melted them with a lighter. This thickened the ends enough that they didn't slip under the knot anymore.. Used this string for a year with a 60 pound bow and it's held up so I guess it's good enough but I do wish there was a better way to do it.

In the video I saw, they used a square knot, and it seemed not to slip. Not sure how.

There's cork in Manchuria but it's not the same cork they make wine corks and stuff out of. The bark is thin, and used as a wrapping, not as a building material

Who cares? You're still not bending the limb anywhere near as much as when you shoot it. Don't worry about it, Koreans have been using the step through method for as long as they've been using FRP bows

No, I'm not saying it shouldn't be used, I use it too. Just calling it efficiency is weird and confusing (which is why you keep having to explain what you mean every time you call it efficiency), and values like 122% efficiency makes no sense.

Efficiency is the ratio of useful work to total energy. The % sign also means a ratio, there are no units after a percentage because it's a pure dimensionless metric. 122% ftlb/lb doesn't make any sense.

That's why people just use 1.22 ftlb/lb (or J/lb) and leave it at that, it isn't efficiency.

I wish you wouldn't call that efficiency. We already call KE/SE efficiency, why call energy/draw weight efficiency as well? If you have to call it something performance makes more sense.

Hwarang are (currently) YMG bows.