Benefits of Arrow Speed

By: Bowhunting.com Staff
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12/31/2008
| Comments

Some people say they prefer to shoot a slower arrow. I guess they feel a slow arrow is more accurate. That may have been true when using some of the rough-tuning bows and big-bladed broadheads of the 1990s, but it is not true today.

Other than making the bow quieter, I don’t see any advantage to shooting a slow arrow now. I have compiled the four biggest reasons why a faster arrow is a better arrow.

Flatter Trajectory

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By simply switching to a lighter arrow, you can improve your success rate on shots that require a flatter trajectory or a quicker delivery.  A lighter arrow will diminish kinetic energy, however.

When you bring up the advantages of a faster arrow, the first thing most bowhunters think of is a little margin for error when estimating shot range. Fast arrows fly flatter making it less critical that you get the range perfect when taking shots past 25 yards. At distances up to 25 yards, range estimation is not critical to your results. If you misjudge a 22-yard shot and think it is 17 yards, you will still make a good hit (maybe a bit low). But if you misjudge a 30 yard shot and think it is 35, that is a completely different matter. The farther you plan to shoot, the more accurate your range estimate must be to produce clean kills. While arrow speed won’t save a grossly wrong estimate, it will help you out when you are off by only a few yards.

You may be tempted to think that you can just rely on your new rangefinder to do all the work for you. When you have the time, I agree. They are awesome tools. I love mine. Unfortunately, on about 25% of the shots I take from a tree stand I don’t have time to use my rangefinder. It used to be closer to 50% but I have been shooting a lot of does in recent seasons and that practice has helped me to get better at using the rangefinder fast. I might not be that aggressive on a big buck, but when shooting does, I take more chances with shot timing.

 

That means that even when using the most aggressive approach, I still have to guess the range on 25% of my shots. Sure, like most bowhunters I have pre-ranged reference points around my stands that I can hopefully find and organize in my head, but often I am too panicked to do more than use these points for a rough estimate. The fate of the shot comes down to my ability to judge distance simply by looking at the animal. That is when I am glad I’m shooting a fast arrow.

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When you have time to use a rangefinder and determine the exact distance of the shot, you don’t have as much need for a faster arrow.

 

By the numbers: First, I’ll start with a 240 fps arrow. If you are standing on level ground and aim using your 30-yard pin, you will hit a 7-inch vital area if the actual distance is between 24.6 and 33.9 yards. The total window is 9.3 yards wide. Now if you bump the speed up to 290 fps, you will make a clean kill if the animal is actually between 20.6 and 35.5 yards away. The total window increases to 14.9 yards. That is enough to make a difference. If you have ever ricocheted an arrow off the brisket of a big buck (and I have), you know those extra couple of yards can be significant. I’ll take every yard I can get.

Shooting Through Holes

One of my most painful misses came on a woodland caribou back in 1999. I spent the whole day trying to get within bow range of the bull. I had literally crawled several miles through a bog and had gone all day without food or water. Late in the afternoon I finally had the brute (he would have scored way up in the top of the record book) at 40 yards. I snuck up on him in his bed in a small island of trees out in the middle of nowhere. My GPS said I was eight miles from where I had left my guide. The bull stood up and was just getting ready to walk off.

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When shooting through gaps in the brush, a fast arrow will make it through easier than a slower one because it doesn’t require as large of an opening.

The only hole I could find to his vitals was down low, so I spread my legs wide to form a solid base for the shot, took aim and squeezed the trigger. The arrow arced up and slammed into a branch above my line of sight, one that I had not even thought to look for during the few quick seconds. Goodbye bull.

I’ve missed three other big animals (one was a mule deer that I’m sure was way over 190 inches and the other two were big whitetails) because my arrows hit branches that were above my line of sight. I have since learned to look closely on every shot, but I’m sure there will still be times when the hole I want to shoot through is too small. A fast arrow will pass through smaller holes in the brush without deflection than a slower one.

By the numbers: Let’s say you are lining up to take a 40 yard shot at a nice buck that is feeding in a clover patch. You zapped him with your laser rangefinder, and you know the distance to the nearest half yard. You have practiced 40-yard shots until they are easy for you. This is a green light situation.

There is only one problem: you have to shoot through a hole in the branches of a tree that is 20 yards away. If you are shooting a 240 fps arrow, it will be 12.1 inches above your line of sight when it goes through the hole (it’s going to have to be a pretty big hole). If you are shooting a 290 fps arrow, it will be 8.3 inches above your line of sight when it goes through the hole. That lets you shoot through a hole that is nearly four inches smaller.

I think that is a big deal. In fact, I would shoot a fast arrow even if this were the only benefit I received.

String Jumpers

Some deer will drop at the sound of the shot to load up their legs in order to run away. This often produces a miss or high hit. I have shot a bunch of deer (I’m a devoted doe shooter if you haven’t figured that out yet) in a bunch of places and I have yet to draw a solid conclusion on the best place to aim when hunting deer that might drop at the shot.

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When hunting deer that are prone to jump the string – does are much more prone to drop at the sound of the shot than bucks – additional arrow speed will reduce the distance the deer moves before the arrow arrives.

I also have yet to figure out how much bow noise is too much and how it affects the likelihood that a deer will move before the arrow arrives. I’ve seen deer that turned inside out even when I was shooting a very quiet bow.

Here is why I feel arrow speed is so important when shooting at potential string jumpers. I have yet to shoot a compound so quiet that a deer can’t hear it at 40 yards on a still day. Deer have better hearing that we do. However, with a little bit of wind, if another deer is walking nearby, and when hunting in thick cover, I have seen bucks and does completely miss the sound of a quiet bow. Also, they are much more likely to react if they are already alert when you shoot, eliminating any benefit you might have gotten from a quiet bow.

As far as I am concerned, it is a mixed bag. Quiet is good and fast is good; neither seems more important. Actually, both are important. Unfortunately, you have to trade them off. For that reason, I think the best combination is a fast arrow (one that weighs about 6 to 6 1/2 grains per pound of draw force) from the quietest bow you can find.

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Arrow weight is a key ingredient in producing faster arrow flight, however, bow design, draw weight and draw length factor in.

By the numbers: I recently did a study to determine how far a deer can drop between the time it hears the shot and the arrival of the arrow. Of course, a faster arrow gets there sooner so the deer doesn’t drop as far. This is especially important, in my opinion, on shots from 25 to 35 yards. At this distance, the deer is close enough to hear even a quiet bow, yet it is far enough that it can drop a good distance.

I had to make a few assumptions to come up with the final numbers. For example, I estimated that it takes a deer .05 seconds to begin moving after hearing a startling sound, roughly half that of the finest human athletes. It is just a guess. Using this guess, I determined that at 30 yards from a tree stand, a deer will drop roughly 16 3/4 inches with a 230 fps arrow. He may even have time to turn slightly. It will drop roughly 9 1/2 inches with a 280 fps arrow. That’s a 7 1/2 inch difference!

When aiming a 230 fps arrow at a buck that appears alert, you will have to aim below the bottom of the deer’s chest (16 3/4 inches is a long ways). It is hard to make yourself do that when you don’t know for sure how the deer will react to the shot. He may drop and he may not. You will only know for sure after the fact. I would much rather have a fast arrow and aim for the bottom of the kill zone. If he drops, I should still be in the top of the kill zone. If he only drops a little, I am dead center and if he doesn’t drop at all, I am low in the kill zone. The only way you can have this luxury is to shoot a fast arrow.

At short range, string jumping isn’t really a factor. Once again, arrow speed is much less important at short range than it is at mid-range and long range. 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.

More Kinetic Energy

As long as you keep the same arrow weight, making it go faster offers some advantages. Most experts agree that kinetic energy is the best measure of the penetration ability of an arrow. Heavier arrows will soak up more of the energy from your bow and that translates into more kinetic energy. However, you can also increase kinetic energy by going to a faster bow without changing arrows.

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Today’s bows are so much better than those of the past.  You can shoot these bows accurately at higher arrow speeds.  Today’s broadheads, with their diminished blade surfaces are also more accurate at high arrow speeds.

There are some very fast bows on the market now. I have compiled a sidebar of several of the fastest as part of this article. If you are shooting a bow with an IBO speed rating of 300 to 305 fps, you are shooting a bow with average speed. There are now bows producing IBO speeds in excess of 320 fps with forgiving brace heights and comfortable draw cycles. In that way, technology has definitely improved the performance of modern bows.

 

Some people don’t see a reason to shoot an arrow five inches into the dirt on the other side of the animal. I agree, that extra energy doesn’t do you much good if you always hit the soft tissue, but what happens if you accidentally pull the shot and hit the buck of a lifetime in the shoulder blade? Remember, the shoulder is not very far from the spot where you are aiming. I want to turn that marginal hit into a clean kill. The best way to do that is to shoot conservative broadheads on small diameter arrows that are carrying a lot of kinetic energy.

By the numbers: You can calculate kinetic energy using the following equation: KE = total arrow grain weight divided by 450,800 and then multiplied by the arrow velocity in fps squared. Assume you shoot a 450-grain arrow at 240 fps. Your KE is 57.5 ft-lb. Now if you can bump your arrow speed up to 290 fps with the same arrow your KE goes to 79.3 ft-lb. Shooting the same arrow out of a faster bow will increase your penetration energy by 38%!

Granted, you probably won’t make the full 50 fps improvement simply by changing to a faster bow, but even if you improve your energy by 30%, or even 25%, you are making a difference.

Conclusion

Arrow speed is still a very important part of the overall success equation. I know bowhunters who would not ever consider hunting with a bow shooting less than 300 fps. I generally shoot around 285 to 290 fps. There are many reasons why this makes sense to me. The only downside is a slightly noisier bow, and with the strides that have been made by bow companies in recent year to make their bows quieter (and with all the aftermarket accessories) my bows are much quieter today than they were ten years ago. If you choose the right bow, you can realistically expect to shoot fast and quiet. Get the best of both worlds.

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5 Comments on "Benefits of Arrow Speed"

Re: Benefits of Arrow Speed

I absolutely agree. I hunt with a PSE OMEN and 425 grain arrows. It is absolutely true how flat a fast light arrow flies. I have found there to be a range trade off if the arrow is too light. The heavier tips make the arrow nose dive. Best practice for all of us is expirement with your setup and see what works for you.

Posted by Play Tillithertz on 9/25/2010 5:38:08 PM

Re: Benefits of Arrow Speed

Excellent article. Has anyone heard about a new arrow ballistic measurement system called Velocitip. I think that having the ability to change your set up to try heavier/lighter arrows and get actual data would be awesome.

Posted by Tim DeGraw on 12/26/2010 10:02:30 AM

Re: Benefits of Arrow Speed

I'd like to know what broadhead that is pictured above!

Posted by AK Matt on 12/20/2011 8:59:14 PM

Re: Benefits of Arrow Speed

KE is not the best way to measure penetration. Momentum is the biggest factor in penetration which will come from using a heavier arrow. A fast arrow that is light can have a lot of KE but it will lose a lot of that energy as the arrow enters the game momentum will carry the arrow farther into the animal as a heavier object is harder to stop. Speed is great but you need to find the happy median especially on big game like elk, moose ect.

Posted by Craig on 4/13/2012 1:53:49 AM

Re: Benefits of Arrow Speed

i have a friend who said he was shooting at a buck from 15 yds away with his bow that he says he had checked at 310 fps and said the deer dropped enough that he shot over his back.... i told him there is no way at 15 yds that a deer could move enough to cause you to miss the shot, especially a bow that shoots 310 fps. my opinion he just got buck fever and missed him. lol

Posted by rthacker on 10/12/2012 4:06:12 AM

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