Nice rocket! So far I have built 2 of these (They seem to only be available through Hobby Lobby), and they both fly great on D12s and E12s. A couple of serious mods you might want to consider is 1) Add 3 small strakes to the upper half of the body to help forward stability. It does corkscrew rather badly without it. I glue them on inline with the 3 fins, each strake is about 2" long, 1/16 x 1/8 balsa strip. 2) I down sized the parachute to a Top Flight 15" nylon chute in neon orange. It's still plenty big enough and the rocket doesn't drift away so badly in a breeze! My onboard altimeter has registered flights above 1600'!

Dee Waldron, Camden AR