The power of a crossbow is usually displayed in lbs (English pounds) and the more lbs, the more speed a crossbow arrow will have and this speed is measured in fps (feet per second) of m/s (metres per second). ![]() A crossbow therefore, can have a bigger draw weight, making it harder to cock. The reason is simple: when drawing a bow, you need to hold it by hand at maximum tension while aiming, while a crossbow allows you to relax your muscles after cocking for a smooth aim before pulling the trigger. This generates less stress on the trigger mechanism, meaning less wear and a better sensitivity.Īs a rule, cocking a crossbow takes a lot more effort than to draw a bow. After the initial 150 lbs are overcome, the draw weight reduces to 37.5 lbs. ![]() Take, for example, a 150 lbs compound crossbow with a let-off of 75%. Where other crossbows require the most draw weight at the end of the pulling stroke, the string of a compound crossbow reaches its heaviest draw weight somewhere halfway, before getting lighter again, thanks to the eccentric pulleys leaving only a percentage of the maximum drawing weight at the end of the stroke, the so-called let-off. The crossbow string has roughly three times the length of a normal bowstring and because of the pulley system, the limbs can be made incredibly stiff to generate a massive power.
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