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
The Geographical Pivot of History strategy is a form of geographical determinism. The Geographical Pivot of History "The Geographical Pivot of History" is an article submitted by Halford John Mackinder in 1904 to the Royal Geographical Society that advances his heartland theory. In this article, Mackinder extended the scope of geopolitical analysis to encompass the entire globe. According to Mackinder, the Earth's land surface was divisible into: The Heartland lay at the centre of the world island, stretching from the Volga to the Yangtze and from the Himalayas to the Arctic. Mackinder's Heartland was the area then ruled by the Russian Empire and after that