Author Topic: What single bevel design has the most aggressive spiral wounds? (Read 4719 times)

Morning Star · « **on:** May 03, 2018, 09:47:56 PM »

What attributes to the most aggressive spiral wound channels? Do longer heads spiral more. Shorter wider heads? Degree of bevel? Has there been study of this? Personal observations?

HartHeart · « **Reply #1 on:** May 03, 2018, 10:08:25 PM »

Bishop Archery says that their 630 grain head has more spiral than any other...I think probably due in part to the thickness of the blade. In my mind, a steeper bevel (40 degrees vs the more common 25 degrees) coupled with a thicker that average blade helps with a more aggressive spiral. Btw, the only other single bevel broadhead that I know of besides the Bishops that has 40 degree bevels is the Helix by Strickland...which is also well known for it's spiral effect and interior carnage.

ozy clint · « **Reply #2 on:** May 03, 2018, 10:52:12 PM »

those bishop BH's look killer...on my wallet!!

I don't understand going to all that trouble in making such a bombproof BH then making it a screw in which incorporates a weak link such as the shank of a screw in head. Make it a glue on and mount it to a glue on/glue in adapter. Many times stronger especially, when footed with alloy arrow.

ChuckC · « **Reply #3 on:** May 04, 2018, 10:48:53 PM »

it would seem to me that a narrower head would spin at a faster rate than a wider head.

monterey · « **Reply #4 on:** May 05, 2018, 10:52:23 AM »

You got me thinking about that, Chuck. Trying to ride the arrow in my brain.

ChuckC · « **Reply #5 on:** May 05, 2018, 02:07:22 PM »

Borrow an arrow with a wide head and one with a narrow head and run each thru a raw potato ( large one) or a squash or small watermelon See what they do.

Then report back to us !

wingnut · « **Reply #6 on:** May 05, 2018, 03:30:45 PM »

The key is to have the head continue to turn the same direction the arrow is turning. If you mix them the head will actually stop and try and reverse the direction on impact.

Mike

BAK · « **Reply #7 on:** May 05, 2018, 07:39:39 PM »

So do we want penetration or spiraling? The more rotation the less penetration.

MnFn · « **Reply #8 on:** May 06, 2018, 11:36:57 AM »

I think penetration.

mec lineman · « **Reply #9 on:** May 06, 2018, 01:29:38 PM »

I like wensels and sharks for whitetails. Those Badgers and Cutthroats look wicked to me. 5 years ago i shot a doe quartering hard away. I shot her with a 52lb centaur and sharp grizzly. That arrow went through the ham on my side and through every organ and out the off side scapula! I will also attest, shooting foam targets with single bevels seam to dice up target more than double bevels i shot.

Longtoke · « **Reply #10 on:** May 06, 2018, 10:03:17 PM »

I am far from an expert in physics but just a thought here... if encountering soft tissue such as muscle I would imagine more spiraling would decrease penetration some. However, when encountering hard bone, more rotation could give a great chance to split the bone, thus increasing penetration.

ChuckC · « **Reply #11 on:** May 07, 2018, 07:49:48 AM »

I think sometimes we think too much. My thoughts are, use a good sharp head on a bow / arrow set up that will deliver two holes most times, then put it in the right place. Dead is dead. Single bevels are great but so are double bevels and three blade heads. Get em sharp, make a special delivery, and it will work out. Usually

amicus · « **Reply #12 on:** May 07, 2018, 04:56:00 PM »

This is just my opinion, but I think that with a single bevel bh penetration equals spiral/rotation. Its when the single bevel meets resistance as it penetrates that cause or pushes the bh to rotate. Im pretty sure I read something about that from all of Dr. Ashby's stuff.

ozy clint · « **Reply #13 on:** May 08, 2018, 06:45:13 AM »

the angle of the bevel would have greatest effect on the degree of rotation, just as the pitch of a boat propeller.

amicus · « **Reply #14 on:** May 08, 2018, 10:48:58 AM »

Quote from: ozy clint on May 08, 2018, 06:45:13 AM

the angle of the bevel would have greatest effect on the degree of rotation, just as the pitch of a boat propeller.

I agree. That's why in my opining its best to make sure that bevel is true through out the length of the BH. Not all single bevel bh are created equal. A lot of them have a narrower bevel than others. Which I feel effects rotation. Might not be much but I feel it does. I think Dr. Ashby called Mechanical Action or MA

ChuckC · « **Reply #15 on:** May 08, 2018, 11:58:00 AM »

On a propeller ( water) the two sales features are pitch and size of blade, the latter kinda morphing into diameter as well as number of blades for surface area. Does that translate ? Does it really matter if the thickness or pitch remain constant along its entire contact length as long as the leading edge, maybe one third, has the driving force to start and maintain the twist ? and finally.....does D O G really spell.....CAT ?

monterey · « **Reply #16 on:** May 08, 2018, 04:07:28 PM »

Ashby's MA reference is to "mechanical advantage" which is the term he used to describe the advantage of a 3/1 ratio. IOW, no matter how sharp the steak knife or how tender the steak it's always easier to cut by drawing the blade through at an angle as opposed to the opposite of trying to press the blade straight down.

Morning Star · « **Reply #17 on:** May 08, 2018, 09:30:11 PM »

Pretty interesting video here. This is what got me wondering, along with the multiple designs now marketed.

Tedd · « **Reply #18 on:** May 09, 2018, 05:58:03 PM »

To answer your question...Centaur Big Game Head.
Wide and thick steel.
Tedd

Tee Bone · « **Reply #19 on:** May 11, 2018, 08:15:00 AM »

This is what a Badger looks like going though gel. [ Invalid Attachment ]


LEFT HAND BOWS CLASSIFIEDS	TRAD GANG CLASSIFIEDS ACCESS	RIGHT HAND BOWS CLASSIFIEDS

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Author Topic: What single bevel design has the most aggressive spiral wounds? (Read 4719 times)

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