This is Randy, Owner o' Always Ready Rocketry, arrr, this is me Blue Phenix Sr. Well, blow me down! kit that I offer on me website. Begad! This one is slightly modified t' accept a much longer motor. This flight is on a K700 White Lightning, ya bilge rat, Altitude was 5935. Avast! It is a 4 inch kit and utilized me Blue Tube airframes.