Sorry BGFisher but I disagree. Thin wall = weak arrow. The shorter arrow allows more grains per inch yet provides for a stiffer arrow. Odds are an arrow of the same diameter shaft but thinner wall will go into the 5gal pail of wrecked arrows long before the shorter thicker walled arrow.

The advantage may be dimminished but for those who want speed and are willing to sacrifice accuracy a shorter arrow will always be faster.