According to my calculations a 29/180 with a H238T-M will launch a 10.6lbs. Heres how I came up with the figures. You divide 238 (average thrust in newtons) by 4.45 and get 53.483146 average thrust in pounds. Then using the 5:1 thrust to weight ratio divide by 5 and get 10.696629lbs. Can a 29/180 really work on a 10 lb rocket?