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Image Notes<br />
1. Incorrectly aligned street elbow.<br />
Step 8: Assemble Tractors<br />
Tractors are what slip on to the launcher arms and are propelled with <strong>com</strong>pressed air to pull the net outward. You can build two kinds of tractors. The simplest are just<br />
four empty soda bottles. They must be bottles that were used for a carbonated beverage as they were designed to withstand pressure. Other bottles, especially water<br />
bottles, are much flimsier and likely to burst. The bottles can be filled with a little bit of hot glue, silicon adhesive, or wax to give them a bit more momentum. The soda<br />
bottle tractors are free, nearly indestructible, but suffer slightly shorter range. The high performance tractors are more efficient, due to lower internal volume, so have<br />
greater range. They are a bit more fragile, SDR-21 (Class 200) PVC pipe may be hard to locate, and they take a little more time to fabricate.<br />
Tractor supplies<br />
4 per net 16 or 20oz carbonated soda bottles<br />
Hot glue/silicone sealant/wax to pour in bottles to add weight<br />
Optional additional items needed for high performance net tractors<br />
4 per net 3/4" couplers<br />
4 per net 3/4" caps<br />
4 per net 8" lengths of SDR-21 (Class 200) 3/4" thinwall PVC note: regular 3/4" SCH-40 will NOT work!<br />
4 per net 12" lengths of non-adhesive 1" ID foam pipe insulation<br />
Super glue<br />
Utility knife<br />
Dremel with sanding drum<br />
Assembly<br />
When selecting soda bottles I would advise digging through a recycle bin with a launcher arm in hand. You want a bottle that slips over the launcher arm, and,<br />
ideally, will not slide off under its own weight. Make sure the bottles are identical volume, don't mix in a 16 oz bottle with three 20 oz.<br />
For the soda bottle tractors, there is very little assembly. You may want to test your net gun with unweighted bottles, as you can always add weight later. Use a<br />
scale, or melt/pour identical pre-measured amounts into each bottle. I don't re<strong>com</strong>mend adding more than 40 grams to each bottle.<br />
For the high performance tractors, begin by cutting the necks off of the 4 soda bottles Fig 1. Use the Dremel tool to sand down the threads Fig 2 so the neck can<br />
be pushed into one end of a 3/4" coupler. Once it fits snugly, super glue in place Fig 3.<br />
Take the 8" lengths of 3/4" SDR-21 (Class 200) and glue the soda neck couplers on one end and a 3/4" cap on the other Fig 4.<br />
Cut four 12" lengths of pipe insulation. These will be slipped over the net tractors leaving 2-3 inches of cushion at the end . This will protect the tractor from<br />
shattering if it hits the ground. It will also minimize damage if the tractor accidentally hits something valuable, like a car, plasma TV, or a cranium. Wait until the<br />
tractors are tied to the net (next step) before putting on the insulation.<br />
http://www.instructables.<strong>com</strong>/id/<strong>Build</strong>-A-<strong>Net</strong>-<strong>Gun</strong>/
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