Question: Why are strings and cables twisted at the factory?
Answer: Strings and cables are twisted to attain an exact length so that when a bow leaves here it is at an optimal setting. You can twist the string or cable later to make minor draw length adjustments and still be within the "sweet spot" of the cam.
Question: What is brace height?
Answer: Brace height is the distance, when the bow is at rest, from the string to the deepest point of the grip. Today's bows generally range from 5-1/2" to 8-1/2"
Question: What is the lightest arrow I can use without voiding my warranty?
Answer: You must use an arrow that weighs at least 5 grains for every pound of draw weight you are shooting to avoid damaging your bow and voiding the warranty.
For example, if you are shooting a draw weight of 65 lbs, then your arrow must weigh at least 325 grains (65lbs. X 5 grains=325 grains). While 5 grains per pound is the minimum arrow weight allowed, you may find that 6 or 7 grains per pound makes for a quieter and softer shooting bow while maintaining good speed.
Question: How are speeds determined?
Answer: There are two standards by which speed is measured, IBO ratings and AMO ratings.
IBO stands for International Bowhunting Organization. IBO testing uses a 70# draw weight, a 30" draw length and mandates the 29" arrow be 5 grains of weight per peak pound of draw weight. So, IBO speeds are obtained using a 350 grain arrow (70#'s of draw weight X 5 grains per pound).
AMO (Archery Manufacturers Organization) speed standards use a 60# draw weight, a 30" draw length and a 29" arrow at 9 grains per pound of draw weight. So, in AMO you're testing with a much heavier arrow at 540 grains (60 # draw weight X 9 grains per pound).
Speed testing is generally performed using a mechanical shooting device such as a Hooter Shooter which maintains consistency between each shot and eliminates human influence on the shot.
Question: Why do my arrows with broad heads fly erratic but my arrows with field points fly great?
Answer: There are three important factors that affect arrow flight:
1. center shot
2. bow tune
If your center shot is not set properly your windage (left to right) and elevation (up and down) will be inconsistent. The problem may not be noticeable with field points but will be exacerbated and more obvious when the aerodynamics of a broadhead are introduced.
Bow tune is series of measurements and adjustments made to any compound bow that ensure the bow is functioning properly. Bow tune includes such things as tiller measurement, poundage settings, arrow rest alignment, setting the optimum nocking point location, etc.
Aerodynamics can come into play with a fixed blade broadhead as it is propelled down range. Fixed blade broadheads and the shafts they're mounted on need to be tuned to ensure there's no wobble and the shafts spin exactly true. This is important to prevent the broadhead from planing or catching wind currents in such as way as to cause erratic results.
If you're not comfortable tuning your bow, Parker recommends you visit your local archery shop and have your rig checked out. Not knowing what to do to correct it or how to correct it, can cause even more problems.
Question: Why doesn’t my bow shoot as fast as the specifications say it is suppose to?
Answer: Nearly all major manufactureres measure speed using both the IBO (International Bowhunters Organization) or AMO (Archery Manufactureres Organization) speed ratings.
IBO speeds are measured using a 70 lb draw weight, a 30" draw and uses an arrow weighing 5 grains per pound of draw weight or a 350 grain arrow.
AMO speeds are measured using a 60 lb draw weight, a 30" draw length and an arrow using 9 grains per pound of peak draw weight or a 540 grain arrow.
Both AMO and IBO use only a single brass arrow nocking point on the string. There is no peep and no string silencers of any kind both of which rob speed.
The key to understand speed is to know the weight of your arrow, the length of the power stroke (draw length) and the exact poundage (draw weight).
Any reduction in any of these three deviates from how manufacturers measure speed.
If you're shooting a 29-inch draw you lose, on average, 12 feet per second for every inch shorter than 30 inches.
Question: Do you make 80 or 90 limb weight bows?
Answer: No. The maximum limb poundage found on any Parker Compound bow is 70 lbs.