RE: Arrow to short?
AMO draw length for a true 28 inch draw length would be 27 1/4 inches long from the throat of the nock to the insert.
AMO arrow length is decribed as one inch past the point the arrow contacts the rest. However this is assuming the rest is in the correct position directly above where your hand contacts the grip. This is the most forgiving position for arrow to rest contact.
Most newer drop a ways have some sort of overdraw to them, so you could actually get away with a slightly shorter arrow.
If you use any of the arrow charts or online calculators they go by AMO arrow length. They never ask your draw length, just your arrow length. They calculate your draw length from the arrow length and just assume you have the correct length arrows. If you shoot a longer than normal arrow you will have to take that into acount when using the chart or calculator. If you shoot a shorter than normal arrow you would have to tell it ( chart or calculator) that you were using an overdraw.
Using a shorter arrow is normally more stiff in spine, using a longer arrow is weaker in spine. You are better off to err on the stiff side since it doesn't effect tuning or flight as much as a weak arrow will.
I think his arrows are probably pretty much the correct length. The only way to know for sure is have him draw one and see where it stops in relationship to the rest or risor. One inch really doesn't effect that much in most cases anyway, so most just shoot arrows the same length as their draw length because it is easier to remember. Some shoot a longer arrow because they like the broad head to extend past the risor. I personally shoot arrows that are a tad shorter than they need to be.
Paul
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