[Warning: Sea Story follows...TINS]
Before the Blues ever started flying the A-4, the Navy wanted to know how it would hold up structurally to the demands of many air shows. So they obtained an A-4, hung it high inside a hangar at NADC. They then surrounded its wings, tail, and fuselage with several hundred hydraulically actuated pressure points.
These hydraulic pressure points were controlled by a computer that had programmed the G and aerodynamic stresses of every Blue Angel maneuver. They then ran continuously, 24 hours a day,
every practice and every airshow the Blue's would do in a year, on that test aircraft.
As I watched the trussed up A-4 in that hanger, being artificially twisted, turned, and bent hydraulically by the simulated G and aerodynamic forces, two things stood out:
1. I could not believe how much an A-4 (an aircraft I flew at the time) did actually bend and twist in flight. I thought it was a stiff, tight little aircraft with minimal flex. I was wrong.
2. Without the roar of an engine, and in the relative quiet of the hangar, I could not believe how very loud the noises were made by the aircraft twisting and turning. The creaking groans and popping sounds of metal on metal, as the aircraft went through its simulated airshow maneuvers, was sickening to me.
I avoided that test hangar after that. But I gained a greater appreciation of the Navy' due diligence, and the expertise of the aero design and structural engineers…not to mention Mr. Ed Heinemann himself.
