# Question: How Do I Increase My Arrow Spine?

## What is the correct 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..

## What does 400 mean on an arrow?

The numbers refer to the spine of the arrow. The different spines refer to the stiffness, a 400 spine arrow is generally for bows 40-60 lbs. 350 spine is for bows roughly 55 – 75 lbs, and a 500 spine arrow is for bows roughly 30 – 50 lbs.

## How do I know if my arrow spine is too weak?

Broadhead weight usually affects spine and arrow flight, a heavy tip DECREASES an arrow’s spine (makes it act more limber). A lighter tip INCREASES an arrow’s spine (makes it act more stiff). If the arrow is too stiff it will favor the left side while if the arrow is a bit weak, it favors the right side.

## How heavy should my arrow be?

Overall Arrow Weights I think a good average hunting arrow should fall in the 6 to 8 grains per pound of bow weight, with lighter bows maybe even closer to 9 to 10 grains per pound. A typical 60-lb. bow should be in the 360- to 480-grain range, a 70-lb. bow in the 420- to 560-grain range.

## What happens if an arrow is too short for the bow?

Bending, known as “archer’s paradox,” occurs when an arrow is released from the bow. … 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.

## How do you stiffen an arrow spine?

To stiffen the dynamic spine or reaction flex of the shaft during the shot you need to remove weight up front, cut the shaft shorter, add more weight to the nock end, or lower the draw weight.

## How can I make my arrows heavier?

Insert: Brass or steel inserts Brass or steel inserts are a great way to improve your arrows weight and strength. Toss the flimsy aluminum inserts that come with your shafts and spend a few extra bucks to give your arrows some oomph.

## What happens if arrow spine is too stiff?

Too stiff an arrow usually just slows the bow down with a heavier arrow. Too weak a spine arrow usually yeilds a faster lighter arrow. But the light spine cause the arrow to shoot way off the mark as the range increases.

## What do arrow spine numbers mean?

Arrow spine in its simplest definition is the measurement of the arrow’s stiffness. It measures how much an arrow will bend or flex. … The lower the numbers, the thicker the arrow while the higher the number, the easier the shaft to bend. For example, an arrow with spine number 400 is stiffer than a 600 spine arrow.

## How long should my arrows be for a 29 inch draw?

While most people go for 27.5-inch arrow length for a 29-inch draw, a beginner would be happier with a longer arrow. While this offers less power, it is considerably easier to aim with. If you need extra help, you could consult this handy arrow length to draw length chart.

## Are 340 or 400 arrows heavier?

340 arrows are stronger/stiffer/harder in “spine” than 400 arrows because they bend less. 400 arrows are stronger than 500 arrows. … A weaker arrows is “softer”. Generally 600 arrows are for bows from 15–35 pounds in draw weight, 500 for 35–55 pounds, 400 for 55–75 pounds, and 340 for 75–95 pounds.