9 MEDIEVAL CROSSBOW DEVICES - How do they work?

Medieval crossbows!!!
From hand spanning a crossbow with no stirrup, to using a goats foot lever and onto the really powerful systems of the cranequin and the windlass; just what power can these devices employ? The answers are not just calculated from some designs, they are measured from the actual working medieval crossbows.

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The results are below
Hand Span 1:1 Max 150lb
Sitting Span 1:1 Max 300lbs
Stirrup 1:1 Max 250lbs
Spanning Belt 1:1 Max 320lbs
Doubler Belt 2:1 Max 450lbs
Goat's Foot Lever ~5:1 Max 550lbs
6 Pulley English Windlass 78:1 +1500lbs
Cranequin 182:1 +2000lbs
Screw Jack 47:1 +1000lbs

Apologies for the sub standard audio quality, the lapel mic didn't record properly so we had to use the camera audio.

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