*Disclaimer: Use this design at your own risk. Rockets and compressed gas are dangerous and should only be used by adults that know what they are doing and children under supervision of adults that know what they are doing. Check the laws for model rocketry in your country before launching anything. Never stand in front of or behind a rocket and always keep a fire extinguisher on hand.

I am doing a project to observe the effects of drag on rockets and I needed some baseline data. That's where the static fire testing rig comes in. This rig is designed to test thrust without the effects of gravity or drag. The idea is to mount the motor(or compressed gas) horizontally on a nearly frictionless rail system.

For this project, you will need:

• 1 - Push forcemeter, I used a Nextech DSF-200, any of their DSF forcemeters should fit
• 2 - 8mm polished linear rods, I used a set of 300mm long rods
• 4 - LMUU bearings, I used drylin polymer bearings because caused the least amount of friction of all of the bearings that I tested
• 4 - m5x12 screws and bolts
• 8 - #2 countersunk screws (or anything that will bolt the end pieces down)
• 1 - 2x4 stud- the required length depends on your choice of rods
• Natural Cork sheets or other fire retardant lining or to line the 2x4 stud
• Heat resistant filament. I tested Protopasta's HTPLA series that I had used in a lab setting before and it held up well. PC filaments and carbon reinforced filaments would probably work well.

The structure should be able to handle any thrust that falls within legal model rocket limits, but you need to make sure that your mounting method can handle the shear stress before putting anything big in the rig.

I would recommend printing each part without splitting it up. If you decide to print anything in multiple pieces, make sure to keep to smaller rockets because the structural strength will be compromised on things like the shield and sensor holster.