LBR,

If I dropone pound of feathers or anything that equals one pound on my foot it will have the same result because the potential is the same.

one pound of feathers or steel that is elevated one foot will have 1 foot pound of potential energy. If I elevate it 2 foot it will have 2 foot pounds of energy.

Obvious you would have less steel to acheive 1 pound than you would feathers. It would also be harder to keep the feathers concentrated into a 1 lb unit.

The same is true for arrow material. A carbon arrow that has a spine weight of 69 lbs will weigh less than a POC that has a spine weight of 69 lbs. It takes less of the carbon material than POC just like it would take less steel than feathers.

In regards to your ash arrow example. Ash is more dense than POC so if the spines were the same the Ash arrow would weigh less. It would take less of the ash material to equal the same spine as POC.

We can agree to disagree on many things. For instance we can agree to disagree that 2 + 2 = 4, but it will not change the correct result. I can not argue that someone may have had an experience in which the result was 5, but I know that he achieved the answer by doing something wrong.

The laws of physics are called laws because they are the same every time, other wise we would refer to them as opinions of physics