The Benefits. My fps (feet-per-second) with this shaft is 296. Shot placement is key with those broadheads. On smaller game, whitetails, turkey, antelope or mule deer, etc., kinetic energy is not that important. 25+ foot-pounds. So if you want the added kinetic energy, you can shoot arrows at a heavy 10 gr/lb, just don't forget that to get the extra 9% in KE, you'll give up over 25% of your arrow velocity. Power Stroke and Kinetic Energy. For example, at 10 yards the deer drops an inch, or less, with the slower arrow and almost nothing at all with the faster arrow. Much to consider. CROSSBOWS: HOW MUCH KINETIC ENERGY IS NEEDED? to cleanly take any big-game animal, and reduce arrow trajectory at longer ranges, which makes accurate shooting easier. A 600-grain arrow is, in my experience, pretty close to ideal for most setups. Yes, speed figures into the equation of momentum, but weight has more relevance than speed in the momentum equation. This is because speed cannot always be relied on independently—drag force works against its motion from the point of release. How Important is Calculating Kinetic Energy? penetrates better, but how can mass penetrate better if the kinetic energy never changes. Experience the technology and enjoy the accuracy with this on the coming adventure of deer hunting. Momentum is another important factor in the lethality equation, particularly if you’re a bowhunter. That may seem odd, but the heavier the arrow, the more kinetic energy you will get from the bow. You can figure the KE of your arrow using a formula. The BARNETT TS390 is its 4x32 illuminated scope which gives clear vision in dark. The more kinetic energy your bow imparts to the arrow, the heavier your arrow can be while still maintaining a relatively flat flight path. It comes assembled and has been the top choice and best crossbow for deer hunting. I know that sounds heavy, but there are kinetic energy calculators out there that will figure this out for you in a second. Large game, elk, black bear, wild boar. Rating on Amazon: A chronograph can be used to measure speed or can be obtained from the manufacturer. For that purpose, you need the minimum power stroke of 11 inches and over 70 ft.lb kinetic energy. Knowing how your arrow speed changes with the increase in arrow weight, you can now easily figure out the new kinetic energy: For instance, if you know your crossbow shoots your current 400 grain arrows with a speed of 400 FPS, our chart above tells you to expect 124.8 ft-lb of kinetic energy at 30 yards. It’s important to do some math and know the speed your bow can deliver an arrow of that weight. Its kinetic energy of 135 ft. Lbs. Small game, rabbits, groundhogs. You will not have any control over your arrow once it leaves the string; that is … It may not do you much good to go that heavy if the arrow quickly loses kinetic energy and momentum because the bow isn’t able to push it fast enough. Two necessary things to notice are the power stroke and kinetic energy of a crossbow. “persistence force”) […] That will both give your arrow enough kinetic energy (K.E.) Don’t care for math? Arrow Kinetic Energy (KE) and Momentum Calculator. The most common figure thrown around when hunters discuss the energy required to ethically kill a whitetail is 1,000 ft.-lb. We both use fixed blade 125 gr. That will give you better penetration. Photo by: Bill Kinney I recently got this question from an OutdoorLife.com reader Kyle Turner: "What is thought to be the minimum foot-pounds of energy required to dispatch anything from whitetail deer to moose humanely and ethically?" More force equals deeper penetration. My son and I have harvested 4 elk with a bow in the last 4 years. That’s the amount of energy needed to exert a 1-pound force for a distance of 1 foot. The kinetic energy formula can be found below: (Arrow Speed 2 X Arrow Weight) / 450,240 = Kinetic Energy in Foot-Pounds. Let’s say you’re shooting a heavier arrow that weighs 500 gr. of K.E. The arrow speed is 390 feet per speed. just wondering with all this speed speed speed what do you need to have to take a deer at say 25 yards how much kinetic energy is enough to kill swiftly. arrow at 212 fps. This is a lot of kinetic energy–way more than most experts believe is the minimum for hunting deer-sized game. Using the arrow weight and speed, calculate the KE and momentum. arrow at 238 fps gave is 25 ft/lbs kinetic energy and it gives us a momentum of .211 slug-ft/s. By Tony Martins If you’re a hunter, chances are good that you know something about kinetic energy. Which makes it more difficult to bring down larger game like a buck deer or bull elk. Medium game, deer, antelope. Best Arrow Grain for Deer Hunting. We saw that a 200 gr. Kinetic energy essentially tells us how much energy is needed to exert one pound of force for a distance of one foot. More or less, you can't hit the shoulder, but everywhere else is deadly. It’s generally understood that the greater the kinetic energy, the greater the killing power of the bullet or arrow. The Kinetic Energy Formula. Kinetic energy While speed may seem to be all that matters when choosing an ideal crossbow bolt, you may come to find maximum penetration to be just as important. Let’s look at this. When the arrow makes the impact with the deer, all of the remaining energy is transferred to the razor sharp edges of the broadhead. Arrow FOC (front of center) Calculator. This efficient and durable mid-weight arrow offers the accuracy and penetration needed to take down a deer. Back in the days of the long bow, calculating kinetic energy was pretty important.Modern compound bows and arrows have virtually eliminated the worries about having enough kinetic energy … In the world of compound bows, KE is used to determine how much damage an arrow will will cause, or how deeply it will penetrate, once it impacts the target. Problem is we have had very little or no blood at all. Measuring kinetic energy is how most bowhunters determine an arrow's killing potential. Broadheads and our arrow weights are at 8.9 GPI. Among archers, I see and hear a lot of discussions about the kinetic energy (KE) of arrows. In the archery world, kinetic energy is figured out by multiplying your mass arrow weight by your arrow speed squared. So before you make your decision in the speed vs. kinetic energy debate, you should consider your target - and the energy is takes to ethically harvest that animal with a bow. Carbon penetrates better simply because it recovers from launch and impact flex faster than other alternatives. Take a 250 gr. The killing power of an arrow is measured in Kinetic Energy. The Rugged Wrap construction process produces a straight, tough, and thick carbon weave, this provides high kinetic energy in a dependable arrow that will keep doing the dirty work through multiple hunts. 42-65 foot-pounds. or better within 20-30 yards will do the job nicely, if the arrow is placed right. An arrow’s KE is calculated by the equation: velocity squared times weight divided by the constant 450,240. Though kinetic energy (KE) has been the standard for years, I prefer to use momentum–a mathematical calculation of energy–to predict arrow penetration, rather than KE, which is a measurement of potential energy… My bow stayed the same: 60-pounds at 27.5-inches of draw. Bow/Arrow Speed Calculator. More Kinetic Energy As long as you keep the same arrow weight, making it go faster offers some advantages. Even several major arrow manufacturers have KE calculators and recommendations for big game hunting. Lighter arrows will increase speed at the expense of momentum. Depending on what you are hunting, you'll want an arrow-and-broadhead setup that will push at least 25 pounds of energy into your game. Another factor to consider when choosing a bow for hunting is kinetic energy. Once these figures are known, multi- ply velocity X velocity X total arrow weight in grains, and then divide that figure by 450,340 to obtain kinetic energy in foot-pounds. This is especially true for bowhunters shooting bows between 40# and 55#. Any bow at 45 lbs. In simple terms, speed is what gets an arrow to its target. To use another African example, a crossbow shooting a 500 grain arrow at 350 fps developes about 100 foot-pounds of kinetic energy, sufficient go-power to hunt Cape buffalo or elephant in a compound bow. Kinetic energy is a firearms equation and not relevant to archery. make sit more reliable and worthy of your money. That means it has about 64 ft-lbs of kinetic energy when it leaves the bow. Unfortunately, momentum (a.k.a. For all bowhunters - an arrow and broadhead set up that can give them reliable lethal penetration, even when bone is encountered, is the most important element of their bowhunting gear - period. When you shoot an arrow, you don’t want to miss a kill and leave the deer wounded. 25-41 foot-pound. reading the ttb1 tim talks about howard hill with a 40 pound bow shooting a 450 grain arrow in the 140s the kinetic energy is about 20 foot pounds . Maximize Energy. 1. I've shot 9 deer … Calculate arrow FOC (front of center) using two simple measurements and the balance point of the arrow. Some crossbows are beginning to push the 400 fps envelope, so look for improvements in this number across the board in coming years. Kinetic Energy (KE for short) is described as the energy stored within a moving body. Once bowhunters actually try heavier arrows with the right kinds of broadheads they never go back. The weight of …
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