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Shooting & Reloading - Mausers, Big Bores and others >> Bowhunting + Bows, Spears & Knives

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larcher
.416 member

Reged: 11/01/05
Posts: 2655
Loc: Saverne, Alsace, France

Ethics spinning inserts
#118499 - 07/11/08 07:53 PM

Just to tease dear Ann who doesn't appreciate gadgets.

Ethics is marketing a new concept of insert :

Ethics archery

The ‘spinning insert” allows the broadhead to take the easiest path thru the animal due to the free rotation of the broadhead, independent from the arrow shaft. The broadhead is free to deflect off bone instead of trying to cut through it. A “conventional/standard insert” follows the arrow shafts path, which is set, due to friction from hide, muscle, bone, and vital tissue on the arrow shaft.

Your opinion?

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"I don't want to create an encyclopedic atmosphere here when we might be having a beer instead" P H Capstick in "Safari the last adventure."

Edited by larcher (08/11/08 02:15 AM)

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Huvius
.416 member

Reged: 04/11/07
Posts: 3556
Loc: Colorado

Re: Ethics spinning inserts [Re: larcher]
#118517 - 08/11/08 02:53 AM

Not sure I'm buying this concept.
The head is still on a fixed axis to the shaft, so to suggest it can take an independent path to that of the shaft is not so.
Also, I suspect that upon striking the animal, the force of the head "loading up" back upon the insert would bind up the rotation - particularly if they are made of aluminum.
I would like to see slow-mo film of this arrow through some bone reinforced gelatin to see what is really happening.
Just my opinion here...

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He who lives in the past is doomed to enjoy it.

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bigger_is_best
.275 member

Reged: 16/01/07
Posts: 82
Loc: Australia

Re: Ethics spinning inserts [Re: Huvius]
#118525 - 08/11/08 07:56 AM

I suspect the advertising hype is probably the opposite of what happens. Any head fired at game should be sharp enough to shave with, and will bite into green bone (softer and more easily cut than old or cooked bones) If the head is firmly attached to a spining shaft it has some force turning it to new positions. If the head is free to spin then it will be guided by the edges and drive through the bone. I would not suggest that driving through bone is a bad thing, but the reason most "stoping power" theories fail is due to the number of variables involved in any projectile / target meeting. This looks like one more unecssesary variable - will it spin or stop?
Having said that I would be interested in observations of anyone who is using them, and like Havius idea of slow motion film.

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larcher
.416 member

Reged: 11/01/05
Posts: 2655
Loc: Saverne, Alsace, France

Re: Ethics spinning inserts [Re: bigger_is_best]
#118645 - 10/11/08 07:57 PM

The most interesting data on archery and penetration can be found in the reports of Dr Ashby at Tradgang.
penetration on bone

One of his updates is about single and double bevelled broadhead. The single bevelled BH are more spinning and impacts on water buffalo shoulder bones clearly show that the bone is more split by a more spinning (single bevelled) BH that by the usual double bevelled BHs.
Consequently having the BH spin is a premium.

Moreover the weakest part of an arrow is the junction of the BH and the shaft, the insert. I wonder if sophisticated ethics insert aren't likely to be more breakable?

--------------------
"I don't want to create an encyclopedic atmosphere here when we might be having a beer instead" P H Capstick in "Safari the last adventure."

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