[apfarmer]

in reply to: CO wildlife department promotes Ashby research! #39935

Steve:

Have you played with brace height? The brace height affects the amount of time an arrow is in contact with the string, and that amount of time can have a big effect on arrow flight.

[apfarmer]

in reply to: CO wildlife department promotes Ashby research! #37000

Doc:

I am not entirely sure what you are saying. But, let me say that arrow trajectory is caused by gravity working to pull the arrow toward the earth, and the effect of gravity does not depend on mass. You may recall one of the astronauts during a moon trip dropping two objects (one very “light” and the other very “heavy”) and they hit the ground at the same time. So, arrow weight does not directly affect trajectory. It INDIRECTLY affects trajectory by changing the arrow speed out of the bow. And a slower arrow goes a shorter distance during the time required for a given drop caused by gravity. Hence, a “loopier” trajectory.

Mass does have an effect, however. A heavier arrow will resist the effects of air drag, and will maintain its velocity longer than a lighter arrow, everything else being equal.

[apfarmer]

in reply to: CO wildlife department promotes Ashby research! #36301

I am one of the authors of the “Arrows for Elk Hunting” article recently published as part of the “Elk Hunting University” on the Colorado DOW website. One of the issues we tried to address in the article, albeit briefly, was to estimate how much additional error (caused by misjudging distance) would be associated with increasing arrow weight be a certain amount. It turns out to be surprisingly small. So, the compound shooters’ fears may not be well founded in reality. We analyzed the error using a Windows program that I developed, backed up with a little testing at the range. If you are interested in trying the program, I would be pleased to send you a copy – it may help you convince the skeptics who are hooked on small, fast arrows. Send me a PM if you would like a copy to try.

[apfarmer]

in reply to: How About the Samick Sage? #23123

Yes, I bought my girlfriend a Samick Sage, 30#. I replaced the factory string with a 10 strand FastFlight string from SBD, and that change improved its speed and perfomance remarkably. I also put moleskin in the limb pockets and it now shoots whisper quiet.

[apfarmer]

in reply to: First Bow Suggestions For Wife #23102

I also will second the Samick suggestion. I bought my girlfriend a Samick Sage, 62″, 30#. It shot great as it came from Samick. But, I upgraded her string to a 10 strand SBD string which increased the speed about 15 fps over the factory string. I also put moleskin in the limb pockets, and it now shoots whisper quiet at her draw weight of 26 inches, shooting 600 carbon arrows with a 125 grain point.

[apfarmer]

in reply to: How do you? #44843

Stu Miller’s Dynamic Spine Calculator can be downloaded online for free. This is simply an Excel spreadhseet set up to allow you to put in your arrow and bow details. It compares a given arrow shaft, length, point weight, etc to your bow (including #, draw length, center shot, etc). Use of this program will get you in the ball park initially.

[apfarmer]

in reply to: Arrow Dynamics arrows, which model? #13218

John:

I have been shooting a new bow (Dalla takedown: 55# @ 28″) with two arrow setups: 1) Alaska Bowhunters Momentum (a bit stiffer that the Alaskans, I think); and 2) AD Traditional. Both are cut to 29.5 inches, and carry a 300 gr point.

The AB Momentum is on the verge of being too weak with my setup, and the AD Traditional is on the stiff side, although both shoot well. I am leaning toward huniting with the Traditionals and either cutting them a bit longer, or adding more point weight or both. Based on my experieince, the Traditionals should work best for you.

[apfarmer]

in reply to: Just a reminder … #35138

Ed:

I really didn’t open the thorax-I boned the animal in place. Indirect evidence suggests, however, that there was substantial bleeding. First, there was an almost immediate blood trail, in spite of the hit, which was in the upper half of the chest cavity. Second, there was substantial blood in the larynyx area when I sectioned it to remove the lymph nodes for CWD testing. Third, the mouth cavity was full of blood when I removed the upper canines.

I also forgot to mention that the tip of the Brown Bear broadhead was curled a bit (about 1/16 inche of the tip), which I assumed had been caused not by contact with elk tissue but by rocks when the animal tumbled, and fell. I assumed this because the curled tip was ragged as though it had made contact with rock.

[apfarmer]

in reply to: Just a reminder … #33971

Sorry, let me try again! Here is photo.

[apfarmer]

in reply to: Just a reminder … #33967

Dr Ashby:

I just recently returned from the last week of CO elk hunting. I got lucky on 25 September, and have posted the resulting photo. The pertinent parameters are:

Bow: Bighorn takedown recurve; 62 inches, 60# @ 30 inches
Arrow shaft : Arrow Dynamincs Traditional, 31 inches
Broadhead: 160 grain ABowyer Brown Bear w/100 grain steel adaptor
Total Arrow mass: 665 grains
EFOC: 23%

Elk shot @20 yards, hit high , nicked rear of shoulder blade. Broke ribs enterring and exiting. Elk ran 30 yds, stumbled, then fell and died quickly. There was a decent blood trail in that 30 yds, with dollar size blotches of blood every 5-10 yds.

This was my first year using the new arrow setup, and I am very pleased with the results. Thanks for your effort in conducting lethality analyses.

[apfarmer]

in reply to: Help With Some Comparisons on EFOC? #63121

Steve:

Bighorn takedown recurve, 60 lb @29inch draw.

Arrow:
Arrow Dynamics Traditional, 30 inches
Abowyer Brown Bear, 100 gn. adaptor, 25 gn insert = 275 gn Total arrow weight = 660 gn
EFOC = 22%

[Author]

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