Medieval construction crane

[jeff hammond]

looks cool.

what kind of capacity did those things have?

[cotty]

great texturing!

[CoreMaster110]

Looks bloody good!

[gilles]

@unknownuser said:

looks cool.

what kind of capacity did those things have?

[url]http://fr.wikipedia.org/wiki/Grue_médiévale#Principe[/url]

Une cage, d’un diamètre de 2 à 3 mètres, montée sur un axe entraîne un tambour solidaire. Sur ce tambour vient s’enrouler la corde qui tire une charge à soulever. L’effort E à fournir est égal au moment de la force F par le rayon r du tambour, divisé par le rayon R de la cage (ceci sans tenir compte du frottement des différents organes en rotation), soit .

À l’intérieur de la cage, un ou plusieurs hommes marchent pour assurer la rotation. Un cliquet ou tout autre dispositif de sécurité empêche l’inversion accidentelle du mouvement dû à la charge. Un homme pouvait soulever un poids de 180 kg à 4 mètres sans fatigue et pouvait même aller jusqu’à soulever 500 kg de charge (homme de 70 kg, R=1,50 m, r= 0,15 m et un rendement de 0,7). Cette charge peut être plus importante avec l’adjonction d’une moufle.

Google translation:
A cage having a diameter of 2 to 3 meters, mounted on a fixed shaft drives a drum. On the drum is wound the rope pulling a load to be lifted. The effort to provide E is equal to the moment of the force F by the radius r of the drum, divided by the radius R of the cage (this regardless of the friction of the various rotating members) or.

Inside the cage, one or more men walk to rotate. A ratchet or other safety device prevents accidental reversal of movement due to the load. A man could lift a weight of 180 kg to 4 meters without fatigue and could even raise up to 500 kg load (70 kg man, R = 1.50 m, r = 0.15 m and a yield of 0 , 7). This charge may be greater with the addition of a mitten.

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[Aerilius]

Thanks Gilles for the explanation (and the Guédélon photo).

I will need some more cranes, especially one to raise the columns (that one is rather a lifting tower with the column in the center).

The Romans had more sophisticated cranes (Tri-/Penta-/Polyspastos) with 3, 5 or many pulleys (up to 3 tons per person).
Their lifting towers could move several hundred tons (but they only failed with 1200 tons at the Baalbek temple).

[Daniel]

Looks great. But, it's in a finished building, lifting a stone to...what?

[Aerilius]

As I have written, the only (provisory) scene I have is the finished building. Sometimes we have to reverse time and deconstruct it to do the final renderings.

[pbacot]

This is cool. The guy walking inside would really have to trust the ratchet!

[Bryan K]

I love, LOVE, that people use SketchUp to do historical recreations.

Good job!

But I'm really impressed with the women in the render!

Seriously, great design and render.

[irwanwr]

Really nice modelling, texturing and rendering.