1.
Aeroplanes are not designed by science, but by art in spite of some pretence and humbug to the contrary. I do not mean to suggest that engineering can do without science, on the contrary, it stands on scientific foundations, but there is a big gap between scientific research and the engineering product which has to be bridged by the art of the engineer.
Walter Guido Vincenti
2.
Engineers use knowledge primarily to design, produce, and operate artifacts. ... Scientists, by contrast, use knowledge primarily to generate more knowledge.
Walter Guido Vincenti