can korean horn bows match turkish flight bows in flight archery (Page 3 of 3)

Well AF Turkish is up. Not exactly the result I was expecting....... less than 70% efficient and only 200FPS. Draw weight is lower than the AF Tatar, the bow is a bit shorter, and yet they both have the same mass. If I had to guess where that efficiency was lost, it'd be in the heavier siyahs. This seems to be a theme with Turkish bows, why I don't know. The style just has a lot more mass above the top of the string. For what purpose, I can't fathom. This is something Korean bows seem to consistently get right.

It is worth noting though that the AF Turk has drifted pretty far afield of the original Turkish design, even for a laminated fiberglass example. That low brace height means you couldn't shoot it with a siper and it stores more energy than it should. *shrug*

(Yes yes, I double posted, scold me)

Maybe that's why it performs the same as the solid glass one..

After some thinking and correlation, I came to believe that a proper arrow is at least as important as the bow efficiency.
I mean not only weight and drag (diameter & fletching size).
Achieving greatest distances with a heavy arrow, as described, got me thinking.
And then I remembered my amateur rocketry times.
Those rockets usually look like short, fat arrows, but the ballistics are essentially the same, at least after burn-out.
And the magic parameter is the CoG - CoP distance, as it's usually called in rocketry.
CoG is the center of gravity (i.e. the centroid).
And Cop is the Center of Pressure, i.e. the point on the longitudinal axis where the aerodynamic forces equal out.
The CoG must be in front of the CoP, else the projectile is unstable.
CoG and CoP at one point would be meta-stable, i.e. the thing continues to fly on in any orientation you disturb it.
The distance between both points is a kind of "lever" the gravity and drag forces act on the projectile.
The larger the distance, the more stable, but the greater the "pull" of gravity on the tip.
The FOC is similar, but describes the centroid position in relation to the geometrical middle.
You can observe this effect on child "shooting" toys sometimes - if you shoot the fat, lightweight (foamed) projectiles angled upward, they just stop on apogee and drop down like dead. No pointing downward.

To come to the point - for flight shooting, you need a small CoP/CoG distance.
That means, small fletchings (which pull the CoP backward) and small tip weight (which pulls CoG forward).
And those properties seemed to be matched best with this old, heavy carbon arrow of mine.
But you need low wind, and a good technique, as the flight is less stable.

Not coincidentally, the Turkish flight arrows are like that.
Arrow tuning should have the most significant effect for traditionally style (Korean) bows.

Nothing really new, just a recap in more technical terms ...

In theory quite easy.
Take both bows and one arrow, and measure the initial arrow velocity directly after the bow.
This gives you a measure of the bow's efficiencies. The rest is flight ballistics.
When the same arrow leaves the bow at the same angle, the higher the velocity, the greater the distance.

Flight shooting competitions take out the "scientific" approach, inserting individual bows, arrows, technique and shooting angle.
It wouldn't be a competition if it didn't ... 

BTW, I reached a maximum of 220m with my 40# Kaya KTB.
Much depends on the arrow, others reached only 170 .. 180m.