Author Box
Articles Categories
All Categories
Articles Resources

Bowhunting and Kinetic Energy

July 18, 2011 | Comments: 0 | Views: 94

You bring your bow out into the yard for some target practice. You're shooting at the bulls-eye and putting 3 arrows inside of a 3 inch circle. Your speed is phenomenal. It's like as soon as you pull the trigger the bow has passed 40 yards and placed itself into the target in the same millisecond. You can't believe the speed you're getting, but there is one problem, the arrow is not penetrating deep enough into the Styrofoam. Heck, your arrow could perhaps bounce off a deer. What seems to be the problem though? The chronograph recorded you at a blistering 297fps. I'll tell you what the problem is, lack of kinetic energy.

Everyone is so caught up in the speed game. People are overbowing their bows, pulling their draw length back 1-3 inches too long for them, using arrows so light they might as well dry fire their bows. What they do not see, is that kinetic energy is what kills deer, not speed. Yeah, so you're shooting nearly 300fps with a full set up, but do you really think that means that a deer still can't jump your string? Speed is important, very important, but not as important as the kinetic energy you're shooting.

So what is "kinetic energy?" Kinetic energy basically means the amount of penetration your bow is going to produce at a certain arrow velocity. To measure the amount of kinetic energy your bow is shooting, the formula is: speed * speed * arrow weight / 450240. You can see the importance of speed in the formula, but the most under looked aspect in the formula is the arrow weight. IBO recommends you shoot 5 grains of arrow weight for every pound of draw weight, but that is for maximum speed standards and is basically dry firing your bow. You need about 6-8 grains of arrow weight for every pound of draw weight. Yes, this will slow you down a slight bit, about 1fps worth for every 3 grains of arrow weight, but you will gain what is really important: kinetic energy.

There are calculators on the computer that will help you determine your speed and kinetic energy if you do not have access to a chronograph, but the easiest method to determine at home is simply know the IBO standards, which is 30 inches of draw length, 70 pounds of draw weight, and a 350 grain arrow. If your bow does not reach a 30 inch draw or 70 pounds of weight, then use the maximum weight/length your bow comes in and times the draw weight by 5 to determine the total grain arrow used. So if you're using a bow that has an IBO of 335 fps: subtract 10 fps for every inch of draw length lost, subtract 2 fps for every lb of draw weight lost, subtract 1fps for every 3 grains of arrow weight lost, and that should tell your your speed, give or take 5 fps or so.

In example, your bow has an IBO of 335fps, so if your bow is set on 28 inches of draw length, 70 pounds of draw weight, and you're shooting a 427 grain arrow, then your approximate speed is 286 fps and your total kinetic energy is 78 ft/pds of kinetic energy.

Remember to pay a little bit of attention to the kinetic energy your bow is shooting. Don't get so caught up in speed that you lose sight of everything else. Speed is very important, but the total kinetic energy is what you want to look for. Find you a fast bow, put a somewhat heavy arrow on it, and then see how far that arrow penetrates into the target.

Source: EzineArticles
Was this Helpful ?

Rate this Article

Article Tags:

Kinetic Energy


Arrow Weight


Total Kinetic Energy


Draw Length


Draw Weight

LED boat trailer lights are designed to offer high-power output and low-power consumption for ultra-bright and reliable illumination; they are sealed to resist UV-radiation, corrosion, and water

By: Simon Liva l Recreation & Sports > Boating l December 12, 2012 lViews: 276

All these scooters are highly durable as they have been made using qualitative materials. They are ideal for extreme tricks, jumps and stunts for youngsters and are extremely light in weight. All

By: Simon Liva l Recreation & Sports > Extreme l November 24, 2012 lViews: 413

The interest in BMXing has grown massively over the past few years. With BMX hitting its peak in the 80's with freestyle riders, the sport has never looked back. Even more impressively BMX racing is

By: Alan Trotter l Recreation & Sports > Cycling l October 24, 2012 lViews: 452

Mountain biking has grown vastly over the years from simple, open entry competitions to global world cup and olympic events. There are still local enthusiasts and the sport has a dedicated following.

By: Philip Loughran l Recreation & Sports > Mountain Biking l July 10, 2012 lViews: 248

It's unfortunate but true that although summer holidays such as the 4th of July and Labor Day offer some of the best opportunities for families to get out and enjoy some quality time together, with

By: Dexter Luck l Recreation & Sports > Boating l July 10, 2012 lViews: 585

The term "Klunker" that for years became synonymous with heavy, clumsy machines, was actually the model of bike made by the Schwinn company that had something to do with the origins of freestyle

By: John D Meyers l Recreation & Sports > Mountain Biking l July 10, 2012 lViews: 270

Before it became a recreation activity, archery was used by our forefathers as a weapon for hunting and even in combat. With the developments in technology, sophisticated weapons can now be produced

By: Amrit Pall Recreation & Sports > Archeryl May 16, 2012 lViews: 211

With the increasing number of crossbow models available in the market, it is necessary to compare the best brands and products. Currently, there are 2 leading products in the market, the PSE TAC 15i

By: Tim X Zhengl Recreation & Sports > Archeryl May 12, 2012 lViews: 258

Crossbows are deadly weapons in the world of hunting. With lightning speed, and lethal accuracy, a shot glides almost soundlessly through the air and brings down a target, whether it's a big animal

By: Tim X Zhengl Recreation & Sports > Archeryl April 09, 2012 lViews: 231

If you are a crossbow enthusiast, then it is advisable for you to research about the different types of cocking device that you can use. There are actually two basic types of cocking device: rope

By: Tim X Zhengl Recreation & Sports > Archeryl April 06, 2012 lViews: 199

Slightly heavier than the PSE Gemini at 8.5 ounces, the PSE Orion sight is manufactured by Precision Shooting Equipment as a mid-level archery sight to improve your accuracy when it comes to outdoor

By: Tim X Zhengl Recreation & Sports > Archeryl March 18, 2012 lViews: 177

Winning in bingo is solely dependent upon luck. Although a few tactics are said to increase chances of winning, these strategies are not full proof.

By: Derik Madisonl Recreation & Sports > Archeryl February 02, 2012 lViews: 160

The shaft and spine of carbon arrows are a very important addition to successful bowhunting. The "shaft" of the arrow is also known as the GPI or "grains per inch" on the bow. If you look in small

By: Will E Riggsl Recreation & Sports > Archeryl July 20, 2011 lViews: 82

Discuss this Article

comments powered by Disqus