Finger Shooting, Arrow Penetration, and More

Bowhunting World

Finger Shooting, Arrow Penetration, and More

By Norb Mullaney

Apr 8, 2005 – 3:08:00 PM


Shooting, Arrow Penetration, and More 

Ask Norb:

A few Questions/Answers from Bowhunting
World’s Top Technician, Norb Mullaney

Norb Mullaney


I am a longtime finger shooter,
and it seems the sport is now geared to the newer, single-wheel, shorter-bow
release shooters. It seems that us finger shooters are left behind. I have
been searching for the best finger shooter rest on the market for some
time. Also, is it possible to use a release with a bow set up for fingers? 

Paul Scalogna

Port Jefferson Station,
New York

Norb’s Answer: 
I have used a flipper-type rest for finger shooting for many years and
have found it to be quite satisfactory. I think that New Archery Products
offers several excellent rests that work exceptionally well with finger
release. You can choose from the very simple CenteRest, the more sophisticated
CenteRest Flipper, or the very sophisticated PlungerRest. I prefer the
latter because it offers a greater degree of forgiveness that can be adjusted
to suit the archer. In addition, you can use either the regular pressure
plate (better for hunting conditions) or the low-profile button as you
choose. Cavalier also offers several rests that work well for finger shooting.
The Free Flyte and Super Flyte series mount on trailing arms and are versatile
and dependable. Golden Key features some excellent rests for finger shooters
specifically in the Star Hunter, Springy and Hunt Master series. 

Many of these rests need
to be silenced for hunting. Adhesive-backed, pressure-sensitive felt material
works quite well. 


More Energy =
More Penetration 

I am interested in arrow
penetration and the role of kinetic energy and momentum. In your Feb. 2002
Tech Talk column you mentioned your planned technical paper on the subject. 

I am curious if your work
will be both analytical and testing, or just one or the other. I’m really
looking forward to a definitive technical paper that will finally be accepted
by all of us who debate the issue, but never have the complete, quantified
analytical or empirical proof to back our theories. 

Larry D. Burcz

Northville, Michigan 

Norb’s Answer:  
My tests used shafts of identical outside diameter essentially eliminating
some of the variables normally present when comparing the performance of
arrows of varying weight. The only variables were arrow weight and hence
momentum and kinetic energy. Remember that varying arrow weight alters
bow dynamic efficiency hence the mass-velocity product also varies. 

So far my extended analysis
indicates that within the range of arrow weight that I tested, both momentum
and kinetic energy have a reasonably linear relationship to penetration
potential. I believe that at lower arrow weights momentum will change to
a non-linear relationship. More tests are required. 


Carbon Arrow Dilemma 

I have a 1998 Golden Eagle
Evolution, which I enjoy very much. But I shoot a lot of 3-D. I have a
target in my backyard I shoot every day, and I go to the local 3-D range
every week. I shoot aluminum arrows (2315, 28 inches long, with 125-grain
tips, 5-inch plastic vanes, and I use a release), but I end up bending
some arrows. I own an arrow straightener but I am not very good with it. 

What I would like to know
is what if any carbon arrow will weigh close to the weight of my aluminum
arrows. The reason being, I have tried some carbon arrows and even with
Sims LimbSavers and string leeches, my bow is louder with carbon arrows.
So could you tell me what would be the heaviest carbon arrow spined for
my bow (I shoot 65 pounds)? And what about these carbon arrows that I’ve
heard about that you slide plastic tubes in them? 

Robert A. Brown Jr.

Shelby, Michigan 

Norb’s Answer: 
I judge that you are aware that, with all else being equal, in order to
maintain the same noise level with your bow you will have to shoot arrows
close to the same weight as your present arrows. 

I estimate that your 2315
arrows weigh approximately 520 grains. The Game Tracker Terminator Hunter
6075 (T 2003 shaft) weighs 12 grains per inch. A complete 28-inch arrow
with three five-inch vane fletch should come close to equaling that weight
with a 125-grain point. 

Game Tracker also offers
plastic weight tubes for insertion in arrow shafts to add weight and increase
kinetic energy. Red tubes weigh two grains per inch. Yellow tubes weigh
three grains per inch. These weight tubes have little effect on the static
spine but do reduce dynamic spine. 


Limb Replacement? 

I have a Golden Eagle Light
Speed One (45 pounds to 60 pounds). The bow was new in 1999 and now I can get 55 pounds out of it with a new string and cable. My question is, can
I put the bigger limbs on to compensate for the weakening limbs over time? 

Robin Ward

Lincoln, Nebraska 

Norb’s Answer: 
Generally all handle designs are developed to be able to use 80-pound limbs
with the exception of juvenile bows. There should be no problem with replacing
the limbs on your bow with new 60-pound limbs. 

However, I find it difficult
to believe that part of your problem isn’t improper set up. I am not aware
of your level of expertise, but if you are not skilled in bow mechanics,
I suggest that you consult a competent pro for an evaluation. 

Article reprinted
with permission from Bowhunting World magazine.

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