It took 40 oz of nose weight to make it stable. Part of the reason that it requires so much weight it that I made an interchangable motor mount with baffle so I can make a cluster later on. I will need to reduce the delay to 8.7 seconds for optimum delay. I also made the nose weight adjustable so that I can add more if needed with bigger motors. It also is set up for duel deployment in the future.
I will need a box of shop towels if this thing crashes on the first flight but it should be pretty tough the fins are 1/4 plywood with fiber glass on each side with through the wall and two part foam, the transitions are fiber glass on card board with two part foam in side