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Uploaded by smike 04/11/2008 12:26:43
A derrick crane is a slewing strut-boom crane with its boom pivoted at the base of a mast which is either guyed (guy-derrick) or held by backstays (stiff-leg derrick) and which is capable of luffing under load.
It is controlled by lines powered by some means such as man-hauling or motors, so that the pole can move in all four directions.
A line runs up it and over its top with a hook on the end, like with a crane.
It is commonly used in docks and onboard ships.
Some large derricks are mounted on dedicated vessels, and are often known as “floating derricks”.
This is one of those ships Rosa the Crane Digger ship.
made this model a long time a go but had missed to upload it here…
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Another wonderful model smike. I’ve learned more about cranes and other workhorse equipment from you than any place except maybe the Discovery Channel! Thanks for the explanations too.
I had to look up “luffing under load” to find out that it means (I think) “to raise or lower the outer end of the boom of a crane or derrick so as to move its load horizontally”. Yikes, I never realized that luffing under load could be so important! :)