Single Bevel Broadhead rotation inside target/critter

[JimB]

Originally posted by KentuckyTJ:
JimB,

I think I am way under qualified on my own thread at this point but my uneducated guess is the fletchings are following the rotating path cut by the single bevel head.

TJ,I think you are exactly right.The only explanation I could come up with,is that the broadhead passes through the 4.5" of medium very quickly and the fletching induced rotation keeps doing what it does.

If the fletching was not matched to the bevel,would this still happen?I don't think so but at some point,I'll give it a test.

[Bowwild]

When I first started shooting single bevel I did it because a friend made the broadead. I didn't really buy the idea that the blade would rotate once it encountered resistance (the target or animal). The seller didn't talk so much about that as he did the way the single bevel, with rotational force, would interact with bone (read leg bone) if hit.

However, when I removed these broad heads from foam targets, like others have reported, you have to rotate them out or tear hay-jack out of your target.

I did screw up that first year though because I used opposite wing feathers that didn't match the single bevel. My fletch and broached weren't working together as the should. Two deer ended up in the freezer in spite of my error.

[ranger 3]

I took this potato and pushed a single bevel broadhead through it as it turned he potato, you can see the S.
 

[Kevin Dill]

I've been using single bevels for years. I"ve shot 2 moose, 2 deer, a black bear and some other animals that either ran in a semi-circle or did a spin just before they went down. By golly...there might be something to all that blade torque!      

Good thread TJ....thanks!

[zipper bowss]

 Now that is putting the torque to them, Kevin

[KentuckyTJ]

Nice on the Spud pic Howard.

Kevin, thats because when they realized who shot them they instantly turned around wanting to meet you!

[KentuckyTJ]

Originally posted by Kris:
     

 

"guess is the fletchings are following the rotating path cut by the single bevel head."

"Ironic isn't it?" the fletching starts the rotation, the bevel takes over through the tissues and the fletch likely compliments that continued rotation out through the exit.

I never actually thought about the fletching orientation causing rotation through the tissues but there is no reason to believe that it does not compliment the spin of the shaft.  I know pulling arrows out the back of a foam target, that the fletching certainly imparts a rotation to the shaft; whether this exist within a bloody cavity remains unseen but I would believe that it does, especially through denser tissues like muscle, etc.

Another very important consideration when matching the wing of the fletch with the bevel of the BH.

Good stuff, thanks for the post!

Kris [/b]

Agreed Kris, I didn't think of that either but definitely think the helical fletchings would continue rotation even in soft liquid matter inside a critter the same as they do through the air. I see a underwater camera and test video in the works. Someone with a slow motion underwater camera, an assistant and a pool please carry this out.

[SlowBowinMO]

I single bevel all two blades whether they come that way or not.  Not only do I like the single bevel results, I can get them sharper too.  Win - win!

[HOGLESS2]

This is my first year using single bevel. They do rotate in target.
They also seem quieter in flight. Does anyone else notice this or is just me.

[Doc Nock]

TJ, et all,

even straight fletched, slight offset, my left wing have a natural helical.  Not to the degree that putting a hard helical on the feather when fletching, but it's there-- and my straight fletched, single bevel, still spin all the way thru the target be it foam or meat.

Come to think of it while typing, when I shot STOS 2 blade double bevel + straight fletched, I had to rotate my arrows to pull back thru the block...just didn't get the S thru meat like with the single bevel...

Wouldn't that also suggest that the fletch starts the spin and continues it thru target mediums?  The single bevel just enhances that perhaps?  And the big reason I like them on game is the potential for a slight off mark hit and bone splitting ability... even with lighter draw weight but heavier arrows...

[KentuckyTJ]

Doc, I'll have to disagree with you on a two bevel head continuing its rotation from flight through a target. I have shot several types of two blade two bevel heads through that same foam broadhead target and they didn't spin through at all. The outlet slits were exactly the same orientation as the inlet ones.

[Doc Nock]

I'll accept your counter... memory is a terrible thing at this age, and I could be wrong...but I thought that was my experience or I'd not have posted it...

I never could pull them back thru the block and always unscrewed them then pulled the arrow...

Who knows, but I'm with you 100% on the single bev doing it... I'd shot 2 deer with my Tuskers that KME ground for me and the tissue damage looked like a ballistic tip bullet!