ACC3-71/GT7595 penetration testing

[Buckfever]

GT7595, 85 grain point and a 100 grain point.
ACC3-71, 85grain point and a 100grain point.
Points were GT EZ pull points.
Both arrows lightly coated with corn oil.
Distance: 13yards
Shot into unused portion of 3-d target.

7595/85grain point; ACC3-71/85grain point:




7595/100grain point; ACC3-71/100grain point:




7595/85grain point, 386 grains: 11-3/16"
ACC3-71/85grain point, 404 grains: 13"

7595/100grain point, 401 grains: 11-1/2"
ACC3-71/100grain point, 420 grains: 13-1/4"

This is a huge difference in penetration. It isn't the weight, that only explains a small portion of it. It isn't the shaft diameter as the ACC is a hair thicker, it isn't the finish as I coated the shafts with corn oil. Is it the spine difference? I sure don't know, maybe someone could explain it to me.

[Twanger]

There are just so many variable I actually don't think the penetration difference you show is that significant. I'd think that the slight variations in your form from shot-to-shot could result in penetration differences like that. If you shot ten arrows of each type and averaged the results and still got the same answer, with a very small standard deviation, then I'd start to believe there's a real difference between these arrows.

[Buckfever]

4 more same deal:

[freedomrules3]

seems to be very consistent in the results. i also dont think its the weight that is driving them home harder. if that were the case the 7595 100 grain would have penetrated the same as the acc's 85 grain head, but didnt. 3 grains difference in weight. maybe the acc's are just getting settled in faster because of the straightness tolerance differences. there has to be a reason why they are penetrating more every time.

[Buckfever]

Here I weighed them equally 7595 with a 100 grain tip and 3 washers for 404 grains, ACC3-71 with an 85 grain point 403grains.





I actually took 3 shots, but the picture I took didn't capture it.

[ncboman]

Here I weighed them equally 7595 with a 100 grain tip and 3 washers for 404 grains, ACC3-71 with an 85 grain point 403grains.

actually with the above configuration, you are giving the goldtips a heavy edge because of the foc differences, yet the ACC still wins.

[Buckfever]

So what is it NC? Is it the spine, the tolerances?

Qualitatively I can tell you that the 3-71 flies much more quietly and strikes the target much more quietly than the 7595. It seems more efficient, it penetrates better, but right at the launch the chrono says, there's no difference in energy.

[ncboman]

I have a pretty good idea as to why, but it's only theory.

[Buckfever]

And that theory would be? Come on you flat out set me up on this.

[ncboman]

buckfever said:

And that theory would be? Come on you flat out set me up on this.

hey, I'm just a country boy from North Carolina. You yanks are much too smart for me to set up. ;D

Have you got a fiberglass arrow?

[Buckfever]

"hey, I'm just a country boy from North Carolina. You yanks are much too smart for us to set up."

Do you believe this guy? LOL

"Have you got a fiberglass arrow?"

Can't say as I do.

[Buckfever]

I'll tell you one thing. I have never seen an arrow control fixed head flight like the 3-71 does.

[ncboman]

ok, times up.

the fiberglass arrow was to make you think.

My theory has to do with recovery from oscillations. I think the aluminum tube wrapped with carbon recovers from the initial oscillation of shot quicker thereby reducing wasted energy.

[ncboman]

not even a comment?

well try this on for size.

take a goldtip you care little about and remove the nock.

pour about a half a thimble of water in.

shoot it about half full of instafoam insulation and let it set.

trim the foam that expands from the nock end and replace the nock.

weigh the arrow and test it.

amazing.

---------------------------------

here's another.

take the gold tip weighed up to match the ACC and test penetration at 30yds.

[ncboman]

since I'm feeling generous in my old age here's another one.

Take a gold tip, remove the nock and drop in one BB only, so the BB rolls back and forth inside the shaft.

test it.

repeat this test using a #4 buckshot pellet.