Which motor class is specifically recommended for the high-end commercial 'So Long' kit?
Answer
Aerotech N-class motor
The "So Long" kit is marketed with recommendations for powerful, reloadable motor systems such as the Aerotech N-class motor to generate the required impulse.

Related Questions
Who holds the current record for the highest altitude achieved by an amateur or student-built rocket?What was the measured altitude in feet for the record-setting flight by USCRPL?What is the altitude of 470,000 feet converted to kilometers?What recognized aerospace boundary did the USCRPL flight definitively cross?What critical distinction is made when a rocket crosses the Kármán line?What is the name of the high-performance model rocket kit mentioned as being engineered toward the record altitude goal?Which motor class is specifically recommended for the high-end commercial 'So Long' kit?What types of motors are necessary to achieve altitudes approaching 470,000 feet?What challenge must the recovery system overcome at the record altitude of 143 km?How does the record altitude compare to the typical cruising altitude of commercial airliners?