We don’t recommend using very large tubes such as scaffold and dropping the complete rockets in as it can cause unstable take offs.
When attaching your tubes you’ll need to secure them in place. This can be done with cable ties if you’re using a top and bottom brace, or gaffa tape if you have a vertical bar for each tube. Any method of securing the tube that’s hit by the launch sparks will deteriorate and burn through in time though, so keep this in mind.
You can either secure your rack on a couple of larger stakes that you hammer into in the ground or make a free standing base for use on any type of surface including concrete.
Members of our Fireworks Forum have been quite creative in using many other racks and trestles as a starting point for a rocket rack. A great example is Ikea’s cheap Oddvald trestle (£12 at time of writing) which would be free standing on any surface. B&Q also sell a set of two folding trestles which at the time of writing are only £21 for the set and have the advantage of being easier to pack away when not in use. By drilling holes (to feed cable ties through) in the plastic you can quickly and easily secure your tubes. The use of sandbags or a couple of wooden stakes to secure it from falling over is recommended if it’s windy.
Rack designs are as simple or complicated as your imagination and available time, here are some more examples to inspire you from 20+ years of firing and attending displays: