Today we finished our second rocket.  It really looks good with our new fins.  We added the fins in the perfect location.  We have 3 fins which, based on our simulator did better than 4 fins.  We where able to place the fins in the ideal location by meausuring the curcumferance with a string, then we divided that by 3 and hot glued the fins on.  For the material we used metal from my house.