Arrows Series – Part 2: Measurements

As we start to dive deeper about arrows, my goal is to simplify the information so young archers can have a good basic understanding; it is not meant to be all in compassing or a physics lesson, remember I am still learning too. Therefore, the next step is to understand how arrows are measured and how to determine draw length.

The Archery Trade Association (ATA) formerly the Archery Manufacturers and Merchants Organization (AMO) has the following standard for measuring draw length:

AMO DRAW LENGTH STANDARD

For Manufacturers

Draw length is a specified distance, or the distance at the archer’s full draw, from the nocking point on the string to the pivot point of the bow grip (or the theoretical vertical projection of a tangency line to the pivot point parallel to the string) plus 1 3/4”. Draw length from pivot point shall be designed at DLPP (Draw Length Pivot Point) and shall be called TRUE DRAW LENGTH.

EXAMPLE: 26 1/4” DLPP plus 1 3/4” is the equivalent of 28” draw.

For Dealers and General Use

For practical reasons not requiring precise terms, draw length is the distance, at the archer’s full draw, from the nocking point on the string to the back of the bow at the arrow rest.

EXPLANATION: The standard Manufacturers is consistent with the Bow Weight Standard as related to the pivot point. The DLPP plus 1 3/4” is compatible to previous concepts of draw length. Draw length for Dealers and General Use relieves the burden of preciseness not required for general use and facilitates determining arrow length. THIS STANDARD SUPERSEDES THE PREVIOUS STANDARD.

This can be technical and confusing, however with most recurve risers, the distance of the draw length pivot point (DLPP) to the front edge of the riser is 1 ¾”. Therefore, in general terms…

Your approximate draw length is equal to the distance from your string to the front edge of the riser at full draw.

You could use a measuring tape to measure this distance however unless you have a very consistent anchor point and good form you will have varying results, since you should measure several times. Therefore, any archer who is at the point they are fining tuning arrows for high-level of performance they should consult a professional. Otherwise, I would suggest you use the following simple method to determine your draw length.

Arms Length method

Using a ruler (or other straight stick), place one end in the “V” of your neck (where your neck meets your chest ) and relaxed, reach straight out until your palms touch the ruler. At the point for your fingers is your approximate draw length. Your arrows should always be at least 1” to 2” longer than your draw length for safety reasons and young archers often need to set their arrow length little longer ( 2” to 3” ) to allow for growth.

This gives you a basic understanding of draw length and how arrows are measured, however, things get very complicated for young competitive archers who are still developing and growing in size once you add-in arrow stiffness and flex, arrow cost, type of equipment and bow weight.

It is important to understand how things are measured so you can understand why you are using the arrows you have.  I highly recommend you visit your local archery professional for assistance.

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The Ontario Junior Challenge

During off years of the Ontario Summer Games, Ontario holds the Junior Challenge.  This tournament is a great introduction into outdoor competitions for young archers under 21 years of age.

The Junior Challenge is a held over two-days and consists of two Canadian 900 rounds with all archers shooting the same format as the Ontario Summer Games with distances of 55M, 45M and 35M on a 122 cm FITA target face.  One truly great quality about the Ontario Junior Challenge is there are no qualifying scores required and it is a great training event for archers who are interested in participating in the Ontario Summer Games next year.

This year’s challenge will be held in London, Ontario on June 4th and 5th hosted by the London City Archers.   If you are interested in participating in the Ontario Junior Challenge or would like to find out more information about the tournament, you can contact Lana Perry of the OAA or checkout the Ontario Junior Challenge Event page on Facebook.