How about this? http://www.airspacemag.com/military-aviation/how-things-work-supersonic-inlets-35428453/?no-ist http://www.airspacemag.com/military-aviation/ho

How about this? http://www.airspacemag.com/military-aviation/how-things-work-supersonic-inlets-35428453/?no-ist http://www.airspacemag.com/military-aviation/how-things-work... "During some Blackbird flights, however, the harmonious working of the spike and the forward and aft bypass doors broke down, and all too quickly the inlet was filled with more air than it could handle. When the air pressure inside the inlet became too great, the normal shock wave was suddenly belched out of the inlet in an unstart, accompanied by an instantaneous loss of air flow to the engine, an enormous increase in drag, and a significant yaw to the side with the affected inlet. Unstarts occurred 'when you least expected them—all relaxed and taking in the magnificent view from 75,000 feet,' wrote Graham in SR-71 Revealed. If the crew’s attempts to restart the inlet’s supersonic flow failed, they would have to slow their aircraft to subsonic speeds."