Pintle exotic metal alloys. For World War II aircraft with sideways-retracting main gear units, carefully set-up "pintle angles" for such axes of rotation during retraction and extension allowed the maingear struts to be raked forward while fully extended for touchdown and better ground handling, while permitting retraction into rearwards-angled landing gear wells in their wings to usually clear the forward wing spar for stowing while in flight. Pintle A pintle is a pin or bolt, usually inserted into a gudgeon, which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle
Jonbar hinge Jonbar hinge In science-fiction criticism, a Jonbar hinge or Jonbar point is the fictional concept of a crucial point of divergence between two outcomes, especially in time-travel stories. It is sometimes referred to as a Jon Bar hinge or change-point. The phrase is derived from the Jack Williamson novel "The Legion of Time" (serialized 1938, collected 1952). It refers to one action from its character John Barr, in which picking up one of two objects (a magnet and a pebble) is a major turning point in history: choosing one will lead to a utopian civilization named Jonbar, while the other