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 Bolt action Bolt action is a type of firearm action where the handling of cartridges into and out of the weapon's barrel chamber is operated by manually manipulating the bolt directly via a handle, which is most commonly placed on the right-hand side of the weapon (as most users are right-handed). When the handle is operated, the bolt is unlocked from the receiver and pulled back to open the breech, allowing the spent cartridge case to be extracted and ejected, the firing pin within the bolt is cocked (either on opening or closing of the bolt depending on the gun