forces acting on airfoils in motion relative to the air (or other gaseous fluids)

forces acting on airfoils in motion relative to the air (or other gaseous fluids)

productive relative to the cost

productive relative to the cost

relatively low in price or charging low prices

large or big relative to something else

large or big relative to something else

large or big relative to something else

large or big relative to something else

schizophrenia of abrupt onset and relatively short duration (a few weeks or months)