It was a beautiful day t' fly a beautiful rocket. Ya scallywag! Well, arrr, until launch. Avast, me proud beauty! I measured out t' CG which seemed fine but later discovered that me CP was further up than I initially calculated. This made t' rocket just on t' cusp o' unstable. After t' rocket cleared t' rail it started t' wobble, nay loop, but was clearly nay right. Aye aye! It lawn-darted, shiver me timbers, breakin' t' nose cone, matey, crumplin' t' body tube, and spillin' t' electronics out on t' ground like it had been gutted by a lion. Only after we got t' bottom portion o' t' nosecone off did I realize that t' Eggtimer Quantum altimeter was missing. Well, blow me down! Another expensive mistake, but I am learnin' (the hard way) and keep makin' improvements with each launch.