A joint swing test on the 2m-diameter solid booster flexible joint and a 20k W power level electromechanical servo system developed by CALT and the Academy of Aerospace Solid Propulsion Technology(AASPT)together has been completed recently.The testing included dynamic and static characteristic verifica- A joint swing test on the 2m-diameter solid booster flexible joint and a 20k W power level electromechanical servo system developed by CALT and the Academy of Aerospace Solid Propulsion Technology (AASPT) together has been completed recently. The testing included dynamic and static characteristic verifica -