AMO Speed Rating
The Archery Manufacturer's
Organization set this standard for evaluating arrow speed. To discover
the AMO Speed, a bow is set at 60 pounds, with a 30-inch draw and shooting
arrows that weigh 540 grains. For today's compounds, speeds over 240fps
are considered fast while anything under 220fps is relatively slow.
Anchor
You should draw the
bow and hold the string in the same location every time, anchoring the
bowstring. Many people who shoot with fingers use the corner of their mouth
as an anchor point.
Archer's Paradox
Describes the movement
of the arrow as it bends and flexes around a riser upon release.
Armguard
Placed on the arm
that holds the bow, an armguard protects your arm from getting "raspberries"
from the string hitting it. Some people use armguards to help hold baggy
shirts and jackets out of the way of the bowstring.
Arrow nock
The notch at the end
of the arrow designed to fit around the bowstring.
Axle
The axles are the
shafts that a compound bow’s cams rotate on.
Axle-to-Axle
Length
The distance from
one axle of a compound bow to the other. This is an important number because
it tells you two things: 1) Generally if you want a finger bow, it should
have an axle-to-axle length of at least 42 inches to avoid drastic finger-pinch.
2) A really short axle-to-axle length makes the bow more extreme and a
little more difficult to shoot but may make it faster.
Blunt
An arrow tip that
is not pointed. Usually used to hunt small game or to stump shoot.
Bow Press
A device used to hold
the bow in a bent position so you can work on the bow or remove its string.
Today, pocket bow presses are inexpensive and portable. You should never
go on a hunt without one.
Bow Square
Used to measure brace
height or to align nocking points.
Brace height
Is the length of a
direct line from the back of the grip to the string of a bow. Generally,
the lower the brace height, the faster the bow is. It is faster because
the shorter brace height means that the power stroke is longer. But because
a shorter brace height gives you a longer power stroke, it can be much
more difficult to shoot accurately.
Breakline
Line of demarcation
between the old timber and the new growth. Deer "hold" to these breaklines
and use them as new scraping and rubbing areas. They use the breaklines
both in a parallel and perpendicular manner.
Broadhead
Arrow tips meant for
hunting big game. They generally feature at least one-inch of cutting diameter
and may be fixed blades or expandables (mechanicals).
Brush button
For recurves and longbows,
these rubber round items are placed on a bowstring to keep brush from catching
in between the bowstring and the bow.
Cable guard
Holds the cables to
the side to ensure arrow clearance.
Cable Slide
Fits on the cable
guard and helps the cables move smoothly across the cable guard. New Teflon
cable slides are said to add speed to your bow because they reduce the
friction so greatly. Pure Teflon is a clear or milky white color. If the
slide is not white, it's not Teflon.
Center serving
The center portion
of the bowstring is wrapped (or served) to protect the bowstring from damage,
either from the release aid or from the string hitting the cable guard.
Center Shot
The point that places
the arrow shaft directly in line with the string grooves on compound eccentrics
or the center of the limb tips on recurves or longbows.
Clips or e-clips
Holds the axles in
place.
Creep
When the arrow moves
away from the wall or your anchor point as you aim or get ready to release.
Cresting
The colored designs
on the end of an arrow shaft. Cresting tools are available.
Cut to length
Arrow is cut to specified
length. Measured from bottom of nock to end of arrow shaft.
Deflex
Design where limbs
or riser are angled toward the archer. Deflex designs are generally slower
but easier to shoot accurately than reflex designs
Draw length
The distance at full
draw from the nocking point to the back of the grip. The AMO draw length
is the distance from the nocking point to a point 1 3/4 inches past the
back of the grip.
Draw weight
The amount of force
in pounds required to draw the bow.
Eccentric
The cam or the part
of the bow that is designed to control the stored energy of the bow.
Efficiency
The amount of kinetic
energy of the arrow just as it leaves the bow divided by the potential
energy that went into drawing it, multiplied by 100.
Fletch
The plastic vane or
feather that are at the end of the arrow used to stabilize the arrow’s
flight path.
Grain
The measure of weight
usually used when weighing arrows or arrow tips. 7,000 grains make a pound.
Helical
Refers to the way
fletching is laid on an arrow. Rather than straight, helical fletching
curves slightly around the arrow shaft.
IBO Speed Rating
The International
Bowhunter's Organization has a speed rating that is generally measured
with a bow set at 70 pounds, 30-inch draw and shooting a 350-grain arrow.
Today's fastest bows will shoot over 310fps using the IBO rating.
Insert
The adapter which
is placed into a shaft to make a nock or arrow point fit the shaft. Outserts
are the opposite, they fit around the shaft. Some people believe outserts
make an arrow fly less true, but if all other factors are the same, outserts
shouldn't effect an arrow's flight much.
Kinetic Energy
Kinetic Energy = (arrow
weight) / 450,800 x (arrow speed). Kinetic energy measures the level of
penetration your arrow possesses.
Kisser
Allows you to anchor
consistently by placing the kisser on the bowstring and making sure it
touches the same part of your lips each draw.
Nocking loop
Loop placed around
nocking point. This protects your string from being damaged by the release
aid but the downside is, it reduces speed slightly and some people find
it difficult to quickly attach their relase aid to it when "the big bucks
a' comin'".
Nocking point
Location where arrow
sits on the bowstring.
Nocking points
Objects placed on
the bowstring used to keep the arrow in place and keep the nocking point
consistent.
Peep Sight
Used as the rear sight
of a gun is used. The peep sight is placed on or in the bowstring and the
sight pins and target are viewed through the peep. Sight pins should be
centered in the peep. Small peeps help you gain accuracy but don't let
a lot of light in. Hunters generally apt for larger diameter peeps.
Quiver
Holds arrows. The
most popular for bowhunting is the bow-quiver which holds arrows on the
bow. But some say that makes the bow too heavy and makes it harder to hold
the bow steady in the wind. Other options are hip-quivers and back-quivers.
Recurve
A bow design which
features limbs that bend away from the archer at the tips.
Reflex Riser
Features a grip which
is closer to the archer than the ends of the riser. This results in a short
brace height and a longer power stroke. Thus creating a faster bow but
generally more difficult to shoot than deflexed risers
Shelf
The part of the riser
that is cut out and where the arrow rests.
Power Stroke
Refers to the motion
of the bowstring after it is released. The longer it is, the faster the
arrow leaving it. But the longer the power stroke, the longer the archer
must hold steady after releasing the string.
Serving jig
Tool used to wrap
center serving.
Shoot-around
rest
Rests which features
the arrow shaft sitting on the rest and as it is released it bends around
the rest.
Shoot-through
rest
Shooters using release
aids use shoot-through rests. These feature two prongs holding the arrow
shaft. when the arrow releases, the cock vane flies through the two prongs.
Spine
Refers to the strength
of the arrow shat and its ability to resist bending and to recover after
bending or experiencing archer's paradox.
Stabilizer
Placed on a bow for
the purpose of reducing torque and shock after releasing the arrow. Also,
it helps level out the bow and holds it steady prior to releasing.
Tiller
To measure the tiller
is to measure the perpendicular distance from the bowstring to the points
where the riser and limbs meet. The tiller is the difference in these two
measurements.
Torque
To turn the bow to
one side when aiming or releasing the arrow.
Valley
When at full-draw,
the area between a compound's wall and the point where the let-off ceases
to exist. Some people like a long valley because it allows you the freedom
to move a little at full draw without having your arm jerked, but others
want a short valley so they won't allow any creep.
Wall
Term used to describe
the back of the drawing motion of a bow. A solid or hard wall is when the
drawing motion comes to a sudden and precise end. If the back of the drawing
motion is nondescript, it is called a soft or mushy wall. A solid wall
is usually preferred because it makes it easier to anchor consistently.
Now, some bow companies offer a draw-stop that helps make the wall more
solid.
Archery glossary information
provided by Eder’s Bow.
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