How do you calculate arrow spine?

Static spine is how much an arrow reacts when a 1.94 lb. weight is hung from the center of the arrow. To calculate this, arrows must be 29” long and supported at two points 28” apart. The number of inches the arrow bends multiplied by 1,000 is the arrow’s spine.

How do I know what arrows to use for my compound bow?

You simple take your draw length and add 0.5″ up to a maximum 1″ to determine appropriate arrow length. So if your draw length is 28″, you should get arrows with a maximum length of 29″. What this will do is give you an arrow that will be just long enough to clear the front-most part of the arrow shelf.

What should arrow spine strength be matched?

Spine strength must be matched to bow draw weight. If your arrows are too lightly or heavily spined for your bow, the “archer’s paradox” movements will be extreme, resulting in poor arrow flight and loss of accuracy.

Are 400 spine arrows good?

400 would be good with less than a 27.5 inch draw (27.5 inch arrow) any more i would bump it up to a 350 or 340. It also depends on what bow you are shooting, if your shooting a really hard cam: monster, omen, or vector turbo, alpha burner i would go with a 340.

How long should your arrows be for a compound bow?

A good rule of thumb is to cut it no shorter than the middle of the riser. At full draw, your arrow end would sit right in the middle of the shelf. The best way to determine how long you want your arrows to be is to nock a full-length, uncut arrow and draw it back.

What is a 500 spine arrow?

The spine rating of an arrow is simply a measurement of its stiffness. The same Easton arrow comes in a variety of stiffness: the lower the number, the stiffer the arrow. For example, a 330 arrow is stiffer than a 500 spine arrow.

What arrows should I use for 70lb bow?

For our purposes, a lightweight arrow will be one that has a finished weight of between 5 and 6 ½ grains per pound of your bow’s maximum draw force. For example, a lightweight arrow for a 70-pound bow would have a finished weight (including broadhead) between 350 and 455 grains.