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
Hinge teeth interlocking teeth on either side of the umbones, as is the case in the ark clams (Arcidae), the bitterweets (Glycymerididae), and the nut clams (Nuculidae). The "dysodont" hinge shows a strong ligament along the hinge line, with weak teeth near the umbones, as in the marine mussels (Mytilidae). The "isodont" hinge has lateral tubercles and sockets on either side of a thick ligament which is referred to as a resilium. This arrangement is typical of the oysters (Ostreidae), scallops (Pectinidae), thorny oysters (Spondylidae), and kittens paws (Plicatulidae). The "crurae" hinge has lamellar ridges on or near the hinge plate, and