There were probably at least 30,000 different things tried, and when they crash and kill the pilot, don't try that again. The ones that flew and landed OK because there were no trained pilots who had good flying qualities by definition.
Se probaron, probablemente, 30.000 cosas distintas como mínimo, y cuando ocurrían accidentes que matan al piloto... "no prueben eso de nuevo" Los que volaron y aterrizaron bien porque no había pilotos entrenados quienes tenían buenas cualidades de vuelo,