There seems to be some confusion in this thread about how the projectile velocity responds to the draw weight.
Think of it this way - The total mass of the system (weight of pouch, bands and projectile) and the amount of stored energy, determine the velocity of the projectile. If you double either the length or the thickness of the bands, you effectively double the potential amount of stored energy. You also double the mass contribution of the bands to the total mass of the system. However, because the mass of the entire system hasn't doubled, you now have more energy available to the pouch and projectile than you had in the previous system and therefore the projectile and pouch move with greater velocity.
Conclusion: Upping the draw weight means upping the velocity of a given sized projectile.
Think of it this way - The total mass of the system (weight of pouch, bands and projectile) and the amount of stored energy, determine the velocity of the projectile. If you double either the length or the thickness of the bands, you effectively double the potential amount of stored energy. You also double the mass contribution of the bands to the total mass of the system. However, because the mass of the entire system hasn't doubled, you now have more energy available to the pouch and projectile than you had in the previous system and therefore the projectile and pouch move with greater velocity.
Conclusion: Upping the draw weight means upping the velocity of a given sized projectile.
