The Estes Super Big Bertha was brought back from the 90's and has been up powered from 24mm to 29mm. I have an older D-motor powered model, but the newer design is much better, with through tube fins, Pro Series motor retainer, shock cord and parachute. I'm modifying mine for a 2x29mm cluster and should be a real crowd pleaser. Laminating the fins are a must, only epoxy, no white glue, fore and aft thrust rings, JT-80's reinforcing the entire BT-80, easier and not as messy as glassing the tube, an ejection baffle, +9 additional feet of Kevlar, or braided nylon shock cord attached to the plywood centering ring, some nose weight and at over 1/2 a mile altitude, a GPS tracker.

I would have given the Super BB an excellent review for its performance----It flies great on an F BP engine. I'm super happy with that! But why did they design the kit to make assembly more of a chore than a pleasure to assemble? Specifically I fault the fact you had to cut in the through-the-wall slots for the fins. Really? Why didn't it come slotted? And, especially the fins themselves---instead of the fins being one piece construction, you had to piece together five pieces to get one finished fin---a parts count of twenty instead of four. Really? I can imagine these extra steps might frustrate an relatively novice builder and for an old-timer like me, it was just needlessly exasperating. Still, as I say, it's a great flier and I'm satisfied with the finished product. Just be ready to go through some tedium to get it to the launch pad!

This is a great rocket kit, but needs some upgrades. Why am I responsible for cutting the fin holes in the body tube? Piece of advice, have new blades on hand. Flies straight and looks beautiful. Also upgrades to epoxy helped alot