That's what I figured too. Theoretically we could use 100% body weight as the puller, like the bell ringer, could just swing on the rope to drag it down, but I hesitate to do that because of two things.
I would go higher. Have you ever seen the movie about the ringer of Notre Dame and how he puts all his weight into the rope?
1. the leverarm + projectile isn't as massive as say, a bell (in the bell tower), so you couldn't really swing on the rope as the inertia wouldn't be great enough.
2. The put 2 men per rope. This discounts having the full weight of each man on the rope.
The estimate of 50% of the puller's weight translates to 50% x 2(pax)/rope which equals one full body weight. Maybe this can be upped a little. I'll try rerunning it with 60%.
Good point. Ok, will reduce it to 62.5kg instead of 70kg.
I would rather say 60-65 kg. According to the body mass index this would equate to a body height of 170-175 cm which probably is still too high. In the 1700s there was a Prussian elite bataillon confined to soldiers over 180 cm. The king had recruitment trouble and had to import such tall soldiers from abroad.
Yes, a heavier projectile weight would translate to a shorter range. I chose 1kg to match Chen Gui's account.
Does a heavier weight translate to a longer or shorter range?