Topic: Chronograph + Analysis of Asiatic & Long Bows (natural & synthetic)
Ok, so I found a digital scale and got a measurement for the Goldtip arrow of 416 grains. Bit more than I thought but factoring the field point's weight of 77 grains plus insert and what minute weight the fetching and plastic nock would add I suppose that's about right. Like I said before I draw to 32" but not all of these bows are rated at that. I believe the appropriate formula is the following:
(rated draw weight)/(rated length - brace height)*(draw length - brace height)
So if something doesn't look right just say so. Here's a breakdown of each bow in relation to grains per pound:
Saluki Crim Tatar: 6 GPP (rated 65@30" but drawn to to 32")
Golhan Turk: 6.5 GPP (rated 58@28" but drawn to 30")
Korean YMG: 7.27 GPP (rated 55@31" but drawn to 32")
Mariner: 8 GPP (drawn to what its rated at 50@32")
Korean HMG: 8.8 GPP (rated 45@31" but drawn to 32")
Saluki Damascus: 10 GPP (rated 40@30" but drawn to 32")
Now compare to the chrono results:
Saluki Crimean Tatar Hybrid: 222 fps
Golhan Turk Bow: 183 fps
YMG Korean: 216 fps
Mariner 'Han I'/Khotanese: 173 fps (note: average speeds were actually 160-163...may be more of an anomaly)
HMG Korean: 186 fps
Saluki Damascus: 181 fps
The actual draw weights for each therefore:
Saluki Crim Tatar: 70.2
Golhan Turk: 63.8
Korean YMG: 57.2
Mariner: 50 (obviously)
Korean HMG: 46.8
Saluki Damascus: 41.6
Like I said, this is all I have for carbon arrows but I do believe it is meaningful in lieu of the chronograph being utilized as now I can analyze and see where to go next. For instance, interesting to see what happens when you get to the Mariner and then how the FPS picks back up with an increase in GPP with the HMG and Damascus. Dropping a grain or two per inch with these would be beneficial especially if I were to take either of these out hunting. I have my eyes set on the Easton 700 Axis as a result.
It was also interesting to see how brace height factors in. Turk bows have a notoriously high one and Golhan's at 8 inches does cause a more stark effect on the increase in draw weight when going past what its rated and decreases arrow speed. I think its fair to point out given that you'd expect the second iteration here, which the Turk bow is, to have a higher FPS than the third, which is the YMG when factoring in GPP. But that's not the case as the difference appears tied to the brace height as the rest all more or less had a 6 inch and returns in FPS begin to increase interesting enough towards the end of the spectrum.
Like I said, I like the Mariners a lot but they have more meat on them which can have a tendency to slow things down. Regardless this round of chronographing will help me refine arrow selection for particular bows and I intend to work on refining things for the Damascus and Mariner.
I also have some longbows that I worked on today with measurements that I'll share shortly in this thread after I get done calculating.