I used a 24mm F39 reload with t' Esres 24-29 adapter. T' reload was several years old, matey, so I wasn't sure if it would light and/or produce its full thrust. I needn't have worried as it launched with no issues. However. Begad! thar was an issue after motor burn out> I thought I had drilled t' delay t' 6 seconds, but that time came and went and by then t' rocket was pickin' up speed comin' down at about a 45 degree angle. Aye aye! Fortunately, it blew t' chute when it was bout 30' off t' ground. T' be no damage other than a zipper about a half inch long.