My grandpa worked on the SR-71 project way back in the day- the engines weren't the only thing that grew during flight. All of the hydraulics suffered similar "growing" pains- he said when the plane was sitting on the runway or in a hanger they leaked fluid pretty badly until they figured some things out on how to better keep them sealed up. When the plane was in flight, the skin of the craft was hot enough that a hydraulic leak could spontaneously combust. It was amazing to hear some of these stories and to find out he had worked closely with Kelly Johnson after they had initially retired the planes and did the televised cross-country flight. We had all known my grandpa had worked for Moog during the time, and had weird travel schedules back in the late 50s and early 60s, but nobody in the family, not even my grandma, had known he had worked on the SR-71 project. Was very cool to find out!