Going thru my spare parts box and found a set of Mini max fins and balsa nose cone, so I grabed spare 6.5" BT-50 and added a standard sized 18mm engine mount and came up with this... To set my custom made Red Max rockets from the stock one's I paint them Yellow... For recovery i use a 30" crepe paper streamer and 25" of 1/8 braided eleastic instead of the estes rubber shock cord.