To start the motors, hold full low throttle and full right yaw. Ensure that all the motors are spinning. Raise RPMs slightly and move the pitch, roll, and yaw controls slightly. ALTA X should pitch, roll, and yaw as commanded due to isolator cartridge flex. Ensure that the ALTA X behaves as expected. If it does not, shut down ALTA X and ensure the propellers are installed in the correct orientation and radio settings are correct.