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Motor and Reload Designs
You Can Use

The following is a list PVC pipe motors and reloads for commercial motors that you can make. You can use these motor and reload designs as a starting point and modify them for your rocket using CP Technologies software program FPRED. Your propellant burn rate coefficient and burn rate exponent are likely to be different depending on the particle sizes.

PVC Pipe
Single Use Motors

1.25 Inch PVC Pipe

All of these motors use 1 inch PVC pipe for the propellant cartridges. There is no insulation required inside the 1.25 inch PVC pipe. The 1 inch PVC pipe propellant cartridges are have tapered propellant ends and the cartridges are taped together using electrical tape. Assembly procedures and how to mix and cast the propellant are described in "How To Make Amateur Rockets". One nice thing about 1.25 inch PVC pipe motors is that they fit nicely inside 54mm motor mounts, if you wrap a couple of layers of duct tape around the end cap and nozzle fittings.

2 Inch PVC Pipe

All of these motors use 1.5 inch PVC pipe for the propellant cartridges. There is no insulation required inside the 2 inch PVC pipe. The 1.5 inch PVC pipe propellant cartridges are have tapered propellant ends and the cartridges are taped together using electrical tape. Assembly procedures and how to mix and cast the propellant are described in "How To Make Amateur Rockets".

2.5 Inch PVC Pipe

All of these motors use 2 inch PVC pipe for the propellant cartridges. There is no insulation required inside the 2.5 inch PVC pipe. The 2 inch PVC pipe propellant cartridges are have tapered propellant ends and the cartridges are taped together using electrical tape. Assembly procedures and how to mix and cast the propellant are described in "How To Make Amateur Rockets".

4 Inch PVC Pipe

All of these motors use 3 inch PVC pipe for the propellant cartridges. There is thin layer of insulation (0.06 inch thick) required inside the 4 inch PVC pipe. The 3 inch PVC pipe propellant cartridges are have tapered propellant ends and the cartridges are taped together using electrical tape. Assembly procedures and how to mix and cast the propellant are described in "How To Make Amateur Rockets".

Homemade Aerotech
Reloads

One of the interesting things we found in static firing this motor is that the throat is hardly eroded with the cool burning AN propellant. These nozzles could be reused with a small increase in the bore diameter to maintain similar motor performance between firings.

Homemade Kosdon
Reloads

The nice thing about using Kosdon hardware for your experimental motors is that the nozzles are graphite and do not experience any throat erosion when using AN propellant. You can reuse the nozzles almost indefinitely.