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
Bolt action "safety lugs" at the rear), and this increases potential accuracy relative to a design which locks the breech at the rear, such as a lever action. Also, a bolt action's only moving parts when firing are the pin and spring. Since it has fewer moving parts and a short lock time, it has less of a chance of being thrown off target and/or malfunctioning. Because the spent cartridge is removed by manual action rather than automatically ejected, it can help a marksman remain hidden. Because the cartridge is not visibly flung into the air and onto the ground, a bolt