You need to take some more physics classes because a broadhead tipped arrow is not designed to transfer energy to the animal at all. It is disigned to pass through the amimal and cut as much tissue with as little resistance as possible on its way through. It does not kill by the transfer of energy it kills by hemmoraging. The more tissue cut then the more hemmoraging occurs. If the arrow stays in the animal then it blocks the flow of blood rom the wound to the ground and can make finding that animal more dificult.

So your telling me that you don't want the Ke of the arrow to transfer to the dear. Really Wow then why are we even saying the word in relatioship to hunting. Lets just forget about the blunt force tramma that happens when and object strikes a deer. We should also ignor that fact that the DNR Makes us us larger arrows and have poundage limits on our bows so that their isn't a sufficiant ammount of KE whoops I said it again. And I wonder what type of forces cause the cutting action. Im sorry Im not an expert but you dont need to be a dick.

Hallj86, I am not being a **** but you don't seem to understand how a broadhead tipped arrow works.When a personposts that they have taken numerous physics classes in collegeandprocedes to tell us how a broadhead killsbyposting incorrect information people tend to call them on it.

There is no blunt force trauma associated with it. Broadheads are not striking the deer like a baseball bat, they are slicing through the deer. Just likewhen you cut yourself shaving... there is no blunt force trauma there, just an extremelyclean slice that bleedsfor hours.

No I do not want KE transfered to the deer at all. 40 - 80 foot pounds of KE is a very small ammmount andif thisvery small ammount of KEwas transfered to the animal like a bullet, bat, or even a blunt tipped arrowthen the broadhead would stop dead right about the first ribs and we would all be wounding these animals. The sufficient ammount of KE is there to assure that the broadhead gets through the animal far enough to cut enough vital tissue to cause massive hemmoraging. I want my broadheads as sharp as possible so that they slice very cleanly and effortless through the animal and transfer as little KE to the animal as possible. Most of the forces that actually slow or stop an arrow from passing through an animal have more to do with friction on the arrow shaft and fletchingsthan the transfer of KE to the animal.

Yes I am sure very very verysmall ammounts of KE get transfered to the animal but it is so miniscule that it is neglegable.

Bigbulls is correct.
We kill by hemoraging w/ a broadhead. The energy of trauma is related to a bullet.

Your not going to understand so im done trying to make you. I just have one question what energy is behind the cutting force of the arrow. Some new kind that I dont know.

It obviously takes some energy to push an arrow through hide, flesh, and internal organs. A very sharpbroadhead with a COC design and a narrower cut takes less energy to accomplish this than a dull broadhead with a chisel point and a very wide cutting profile.

But the energy involved here is peanuts compared to energies in the firearms world. A 30/30 Winchester, agood short rangedeer caliber, produces about 2,000 foot pounds of kenetic energy. The .300 Winchester, a good solid elk rifle, has about 4,000 ft. lbs. Even the lowly .22 Long Rifle has more KE than most bows.

The whole energy thing may be somewhat misunderstood in rating both bows and firearms, though. The bottom line is that the size and shape of the wound channel is what kills game. The KE figures can only give you an idea of sort of potential the projectile has to inflict the wound - there are other significant variables as well. With the bow, the broadhead cuts a swath(s) of a certain size and depth of penetration. I have never heard this argued on this board, but I would venture that a pass through on game with a 55 lb. bow does not kill any better than a pass through with a 70 lb. bow - all other variables being equal. The 70 lb. just shoots a little flatter.

Energy in the firearm world is a big deal. However, even in that world I want an exit wound. Exit wounds tend to leak, if ya knowwhatImean? That in a hunters world is a big deal, leaking critters that is. As for a broadhead, they kill an animal by hemoraging, period. There are others in the world that have at least a minimal understanding of physics, I happen to be one as I teach the subject.That said, I'm still firmly in the corner of broadheads doing their work by hemoraging. Kinetic Energy, how does that go? KE = 1/2 mv^2, or something like that....

Then you understand that KE going into the deer is what causes the cutting.

I'm thinking we are all in agreement here more than we realize. And although arrows kill by creating a lot of bleeding and have very little shock (maybe enough for a bunny); there is still a certain amount of KE needed to get the arrow in the animal deep enough for the broadhead to do its work. A 15 lb. kid's bow isn't going to be able to drive a Carbon Expressarrow,sporting the latest Slick Trick broadhead, deep enough into a big game animal to facilitate a humane harvest. I'm sure that is why Colorado (and many other states) has a minimum (35lb.) pull weight for archery big game.

But only a very small ammount of that available KE isactually transfered to andabsorbed by the animal.

The physical properties of the moving object as well as the physical properties of the intended target determine how that stored energy is transfered to the animal. A razor sharp broadhead is specifically designed to transfer a little energy as possible to the animal. It is designed to pass through this soft tissue as effortlessly and efficiently as possible.Soft tissue like lungs and muscle will not allow that razor sharp broadhead to transfer energy to them becasue they are too easily cut by the blades. Striking heavy bone will obviously allow more of that KE to be transfered to the animal becasue the physical properties of the bone are much different than that of muscle and lung.

Now, remove the broahdead and install a rubber blunt on the arrow and all of the available KE is being transfered to and absorbed by the animal with outso much as breakingtheskinand the arrow will bounce right off the animal. Yes, the available KE is transfered to the animal but what good did it do?