I've been fooling around lately with making rockets from scratch and one thing I'm struggling with is launch rod speed. Or to put it more accurately, speed of the rocket upon disengaging from the launch support. I've heard that 50 feet per second is the standard of safety. It ensures the rocket will be adequately stable in moderate wind upon leaving the launch rod. Here's where I get confused. Estes states that the maximum lift off weight for their D12-3 is 14 ounces. I just made a quick OpenRocket file for a wallpaper tube I got from work and it's around 12 ounces, but the lift off speed is only around 33fps. Presumably at the max recommended weight, the launch rod speed will be even less. So do I trust Estes recommendations or go with the established norms? I can shave weight by shortening the body tube but the long tube is kinda cool. And the added overall weight keeps my apogee lower, in a "sure recovery" range. What do you guys think? I've included the OR file if you wanna check it out. It's not 100% complete but should be complete enough for a simulation.