Aruthur P - interesting article. You will note that there is no mention of arrow weight as being a factor in the arrow's flight, once it leaves the bow. This is also the case in rifle bullet ballistics. If a 100 grain 6MM bullet has the same ballistic coefficient as a 200 grain .30 caliber bullet, and they have the same muzzle velocity; they will fly the same out to infinity. Central principle of ballistics. Timeof flight is what matters, and that is controlled by the ballistic coefficient of the projectile as well as the initial muzzle velocity.