RAAF Derrick Trucks

[Richard Farrant]

Originally Posted by Lang

I think "Derrick in and Derrick out" for raising and lowering a boom - sorry jib -is not a sustainable description for current use. Nearly all cranes now have extensions and unless we use "Erect and Flacid" for booms extended and retracted the terms "In and Out" must be sensibly used for the extension function and "Raising and Lowering" the boom used in their proper sense also.

Hi Lang,
I am not really pedantic, but it seems that from some peoples interpretation the word Derrick must be a lifting apparatus that traverses, left and right, well that would have been unlikely on Mr Derrick's gallows
We were talking about 70 year old vehicles so equipped so nothing to do with current use.
To change lanes, the army here had Leyland recovery vehicles in the 1950's and they had hydraulic crane jibs, the action of elevating up or down was called "luffing". Not a term you see used on cranes.

Interesting discussion anyway