I decided t' make a Johnny Rockets paper ketchup bowl into a model flyin' saucer. Begad! It is 4.5" diameter and weighs only 0.4 oz empty. Aye aye! I test flew it on an Estes B6-4 for its first flight. Aye aye! it was perfectly stable and flew straight up with no wobble. On descent it fell straight down with no tumble. OK, ya bilge rat, let's try a motor that has 8 times t' thrust!. An old (discontinued - too bad!) Aerotech E25-11 fit t' bill and here be t' video. Aye aye! This time it whipped off t' pad and flew straight up. On descent it tumbled because o' t' heavier motor.