We have covered Alanโs Bioccaโs fantastic clearinghouse site antennalaunchers.com before, and Brookfield, CT, resident Andrew Stoevโs basic launcher design appears to be a slightly up-gunned version of Alanโs CSV19 pneumatic antenna launcher. Andrew describes his basic modifications of Alanโs design:
- Slightly larger compressed air tank โ my launcher is using 10 inch length of the 4โณ diameter pipe for the tank vs. Alanโs 8 inches. The reducing coupler I am using as part of the tank gives a little extra volume too.
- Longer barrel โ 18.5 inches vs. Alanโs 16 inch barrel โ I had lengthen the barrel a bit in order to account for the larger pressure vessel and have enough clearance for the Zip Reel.
- More reliable and safer pressure vessel โ instead of drilling a hole for 1โณ pipe and epoxy gluing the pipe for the high pressure outlet in a 4โณ end cap, I am using a 4โณ to 2โณ reducing coupler and and 2โณ to 1โณ reducing bushing as part of my pressure vessel. Another advantage is that I donโt have to drill precision large diameter hole โ unfortunately I donโt have a lathe.
- More reliable and safe coupling between the barrel and the high-pressure pipe โ I am using 2.5โณ to 2โณ reducing coupler and 2โณ to 1.25โณ inch reducing bushing. It is much easier to assemble the launcher that way! Alanโs design yields for drilling a 2.5โณ end cap and epoxying the 1.25โณ inlet (actually, a 90 degree elbow) in the hole
- I made the spacer between the pressure tank and the barrel out of two pieces PVC, sliced from 4โณ pipe scrap. I adjusted the curvature of each piece to follow the outside diameter of the corresponding pipe and glued the pieces back-to-back.
Itโs a beautiful build, but my favorite feature is the quick-release mount he added for his Android device. Using a free app called GeoCam, his phone, when so mounted, becomes an augmented-reality aiming scope that provides GPS location, compass orientation, and (probably most usefully for this purpose) phone inclination data. [via Hack a Day]
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