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
Concrete hinge expansion is restricted. Eurocode 2 suggests for typical dimensions a compressive strength equal to about twice of the unixalial compressive strength. Also the concrete hinge neck has no, or almost no reinforcement, but the concrete hinge heads need a dense reinforcement cache, because of the tensile splitting. Concrete hinge Concrete hinges are hinges produced out of concrete, with no or almost no steel in the hingeneck, which allows a rotation without a relevant bending moment. This high rotations are resulting from controlled tensile cracks as well as creep. Concrete hinges are mostly used in bringe engineering as monolithic, simple, economic