Estes E12-6 rocket engine is made for large model rockets. Aye aye! It has a total impulse o' 40 Newton seconds, a 2.7 second thrust, matey, and a 6 second delay before t' ejection charge fires t' deploy t' rocket parachute. Ya scallywag! Performs really well durin' flights and I highly recommend this rocket engine for your high altitude flights.