Why Single-Bevel Broadheads?

Awesome report.  Thanks Doc Ashby.  You've made a yet another believer...          

I am a believer...even before this report. Now if I could just learn how to modify these broadheads...or better yet...the manufacturers actually make them like that and deliver them sharpened and ready to go! I attempted to modify a dozen heads to take to Africa with me and could not get them shaving sharp...they wouldn't even cut a rubber band.

Good stuff Doc!   ....O.L.

I use ceramic rods on my Woodsman and it sounds like the rods would work with this head. Generally speaking, what weight bows do 170gr heads prefer?

Should the arrows have left or right helical for the broadhead to spin in the right direction?

I believe even more penetration could be achieved by rounding the back corners of the head slightly.Aerodynamics should be considered whether flowing through animals or air. I remember reading a penetration test in Bow and Arrow magazine in the late 60`s and again in the late 70`s and the same broadhead won both times. I can`t remember the name as it was`nt in production even during the first test but the only difference between it and the other heads was rounded back corners. And because of those tests I`ve always rounded the back corners of my Deltas.

troutms, Grizzlies need right wing (right helical) to optimize the benefit of the single bevel.

I found it interesting he said using the wrong direction on a single beveled head actually reduced performance below a double beveled head.  I used left wing with Grizzlies for years before I knew any better.

That's what I thought but I wanted to be sure. Thanks.

Anyone know if you using right wing feathers with a straight fletching (instead of a helical or offset) will diminish the performance?  -Chad

That's good stuff right there! Very well done.

Ok, I'm new. Can someone show me the difference in the broadheads and how you make a single bevel broadhead out of a double?

Very well done! IMO this report covers all the bases: theory, testing and example. Made a beliver out of me. Thank you for sharing!

Dave, you don't have to make a single out of a double. Grizzley and A-bowyer make single bevel heads. Grizzley makes a RH bevel and A-boyer makes a LH bevel. Doc Ashby takes a 190 grain Grizzley El Grande and modifies it to his specs. The Grizzley comes unsharpened and is high Rockwell hardened so it is hard work to sharpen and modify each head. But Doc Ashby has proven that the resulting modifications make a superior broadhead that will split bone that gets in the way, either by poor shot placement or the animal moving during the shot.

Grizzly 145 left side Abowyer 125 gr right side as they come from the makers. As far as sharpening my Lansky Knive sharpener works well, with a strop or crock stick.

 


                  Brent

Great report Doc!!!!

Ashby definitely deserves a broadhead named after him.  Great man and tremendous contribution to our sport!    

STD, You got that right. What few are aware of, he does this almost completely out of his pocket along with a huge investment of time.....O.L.

Well, true to form, there's a typo in the single-bevel article - and a huge thanks to Sean for finding it. On Page 21, 2nd Para, last sentnece: "None of these are exhibited with single-bevel broadheads"; "single-bevel" should (I hope obviously) read "double-bevel". (I'm sure my highschool English teacher would be amazed that I can even write - incorrect or otherwise!)

I hope Dave is correct, and that someone - anyone - will make a HIGH-QUALITY off-the-shelf broadhead based on the Modified Grizzly design ... and with a Teflon coating too, like that on the Eclipse. Sure would save me a bunch of time reshaping broadheads - and I could care less what they named it! If everyone interested in seeing one in production wrote some manufacturers, PERHAPS it would prompt a response (but I won't be holding my breath on that one). But, if there ARE any manufacturers intetested, I would be glad to pass along all the assistance I could give them! They could take advantage of twenty-five years of field testing and a few hundred thousand dollard of R&D - for FREE!

Thanks to each and every one for the kind words. Greatly appreciated.

Ed

Hello Doc

Even in France you become famous

Thank again for your help in the bowhunting world

I was thinking about the left wing thing and would suppose if one left the broadhead screwed on lightly the arrow wouldn't hinder the twisting action. You just wouldn't get the added benifit.

As to the manufacturing of "The Ashby", Knife companies seem to be hurting for business. One might talk a knife company into a single run of quanity to see how they would sell.

I suppose Tradgangers could form a company or provide backing for such a product. I don't know what the potental for sells would be for a single product like this. It may be hard to get backing. Now if one would "invent" a 3 and 4 blade version that would open the market. In theory the 4 blade version would have twice the twisting power of a two blade.

I suppose you would need to study the design of the front end a little to come up with the right angle to begin the fracture befor the second set of blades engaged to assist.

If someone was smart enough to patten the idea they could also sell this idea to folf like Muzzy, wasp, etc to be used on the screw on tip infront of their fixed blades. That would be a pretty simple addition to proven designed that may greatly add in penetration.

Someone needs to jump on this and make it happen. Once there is a product the other would follow or lose sales. At that point they would be require to pay you for your design.

Please tell me these modifications have been pattened? Add the screw on tip to the list if you haven't already. My undersanding is pattens can be granted for such modifications.