My chrony test rig for spudgun velocities.

By aturner

 

Overview photos show how I used sawhorses, clamps, and a workmate bench to set up the launcher and barrel on the straight and level...


Notice the ear protection right next to the launcher...


I discovered that flash photos of the chrony trip the sensors. Here's The chrony, lighting setup, and backstop area....


The back stop consists of a plastic trashcan filled with disposable painting tarps, and an old quilt for a shock absorber. I'm very happy with this backstop. The trashcan has not fallen off the sawhorses after a couple of strings of shots....


Looking back from the chrony to the launcher...


My detachable propane meter has been enlarged recently. I set it to 25psi for this particular launcher...


These next three photos show my recent efforts to get consistent spud plugs. I cut the spud in half with a knife, then cut a plug from the flat face of the half spud, then trim the rounded end flat until I achieve a weight of 2oz.

Finally, I check that the length of plug is approx 1 5/8" long with two flat faces (~cylinder geometry)

At this point, I'm simply working on getting consistent velocities. Not happy with it yet, but making progress.

Finally, a lame video of a launch can be downloaded from here:
http://loose-cannon.home.mindspring.com/chrony1/IM002282.AVI
It's a 2.9MB AVI file. Sorry, no sound on my camera.

Special thanks to Chewy for quality control suggestions!