Ashby is losing his mind....

[Doegirl]

tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=24;t=000001
Now there's more than one kind of momentum ! Apparently, somebody figured out it's possible to get more momentum from a lighter arrow out of fast compound bow than a longbow w/ heavy arrows. And we can't have that. ;D
Why does this man simply not state he has a bias against lightweight shafts and modern equipment and be done with it? I wonder how he would explain the near passthru on an elephant with a 325grain arrow?

[BT]

lol!....I cant wait to read this
Hey....I appreciate this guys work on the whole but I can guess by your reaction that this must be a whopper of a theory being floated ;D

[BT]

Ah yes .... seen it
It's been some years on end when I have out penetrated every matter of material with every manner of broadhead while bolstering K.E. with an indifference toward mass.
Persons assuming the opposite seem to always have a reason why my proof is somehow less than someone else's assumption
I will go with the fact that mass when combined with K.E. derived from speed will out perform....however.
In the real world....given the same weight bow....this does not happen in regard to the modern compound.
Traditional equipment is a different matter altogether because of the nature of the bow.

[Doegirl]

To save some search time: it's in the first report "Momentum, Kinetic Energy and Penetration", subtitle "All Momentum is Not the Same".

[BT]

ALL MOMENTUM IS NOT THE SAME



Given two arrows, identical in shaft and broadhead materials and profile, and having EQUAL momentum, but possessing UNEQUAL mass, the arrow deriving the greater portion of its momentum from its mass will penetrate better. The Laws of Physics requires this to be true, and ALL of my field test data validates this to be the case.



To say this in another way, arrow momentum derived through increasing arrow mass results in a greater gain in penetration than does momentum gained by increasing an arrow’s velocity. This is true because the tissue’s resistance is increased by the square of the velocity.
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As I said....diffrent bows will use this theory as suggested....while others will not.
You rarely ever hear Ashby thing beyond the shaft/head combination which is where his early work fell on it's face at times.
Subjective assumption based on limited input is a great stumbling block

Like I said before Ashby is a great source of information and good information but alot of it is supported more by his name and title than fact.