Oliver Simoes (X) May 1, 2011:

Grua aérea Pesquisei "grua aérea" no Google e todos os resultados que encontrei são em espanhol. A única exceção em português se refere à grua aérea para caminhões, que parece estar fora do contexto do texto original. Quem sabe o consulente pode nos dar mais alguma informação.
http://www.google.com/search?hl=en&q=grua aérea&btnG=Google ...

Marlene Curtis Apr 30, 2011:

http://www.google.com/#sclient=psy&hl=en&source=hp&q=skyhook...

Nick Taylor Apr 30, 2011:

Unfindable objects - skyhook :-) A skyhook is a "hook" used to lift an object on a long cable hanging from the sky, without readily-apparent support. In the mid-20th century it was common in the Boy Scouts[1] and occupations such as oil drilling[2] to send new recruits on a futile search for such an imaginary object, as a practical joke. The term has subsequently lent its name to some real mechanisms that use an airborne hook or hoist, and to other products or ideas that allude to the concept. The American philosopher Richard Rorty uses the term to refer to a hypothetical metaphysical system that leads to a universal perspective.[3]