Originally posted by Possum Head:
I think the strength comes mostly from the shank which is threaded only enough to hold the head on the shaft. this is something other makers could learn from. The one piece construction is also a plus. Cant wait to punch a lung with mine!
I was told once, by a work mate who was studying for an engineering degree, that a threaded section on a bolt needs to be only as long as the bolts diameter as past that, there is no advantage as far as strength goes in having more threaded length.
The point I am trying to make, is that even as I can see how the short thread length on the VPA does not hurt their strength........I don't understand why you believe it would make them stronger than normal.
Being machined and quality steel would be more to the point as far as being extremely well made and strong.
I can see a possible disadvantage, in that a shorter thread, while it may not suffer any lack of strength, is probably more likely to come loose unless nipped up tight.
Like anything there are pros and cons, but I still dont understand how the short thread section can possibly make them any stronger, as the plain part of the shank is still the same length as all other broadhead types, if it was not, it would not fit into the arrow inserts.