Instructables.com - Build A Net Gun

1. 8" length of SDR-21 3/4" pipe.
2. 3/4" cap.
3. 3/4" coupler with bottle neck in one end.
4. Completed tractor. You need four per net.
Step 9: Assemble Net
A single net will be cut from the large net you ordered. We will build a net spreader, a string that runs the perimeter of the net and pulls it evenly into a square. The
tractors are tied to each corner, through a loop in the spreader string, and a loop in the corner mesh of the net. This step involves a little knot work, I use the overhand
loop, the bowline, and the double fisherman's bend.
All of the dimensions in this step relate to MN&T sku# 263, if you use a different number you will have to change the following three dimensions.
Substitute the Knot cut point value from the net math spreadsheet instead of knot 54.
Substitute the Cut length value from the net math spreadsheet for the 162" value.
Substitute the Square depth value from the net math spreadsheet as the overhand knot spacing for the net spreader string, instead of 9.55'.
Net supplies
4 tractors from step 8
1lb Memphis Net and Twine sku# 263
OR a substitute net computed using the net math spreadsheet in step 2
At least 50' of nylon mason's twine (#15 or smaller), kite string, or some other thin durable rope. This will be the spreader string
Utility knife
4 zip ties
Assembly
You will receive a pound of net in a plastic bag. The net is pulled taught and wound into the bag like a rope. Find the free end and count off 54 knots and then cut
between knots 54 and 55 Fig 1. The 54th knot should land at 162" Fig 2.
Take your spreader string and measure 5' and tie an overhand loop. Tie three more overhand loops every 9 foot 6 inches. Leave another 5' of string after the
fourth knot and cut. You should end up with 4 overhand loops evenly spaced with 5' of free string at either end Fig 3.
Spread your net out in an area where it can lay flat and as square as possible. Tie an overhand loop in the corner of each corner mesh of the net.
Weave the spreader string through the rim meshes of the net Fig 4. A spreader string overhand loop should line up with each net corner overhand loop Fig 5. The
5 foot 'tails' you left on the spreader string should meet in the middle of the remaining side. Measure a length of 9' 6" on this side and tie a double fisherman's
bend in the middle Fig 6, cut off excess string.
Cut four 2' lengths of string, these will be the tractor strings. Tie one end of the tractor string by making a bowline that passes through both the spreader loop and
mesh loop Fig 7. Tie a second bowline at the other end of the tractor string, try and end up with 16" from bowline to bowline. Zip tie the free bowline to the bottle
neck or the PVC tractor body Fig 8. You can try tying a knot here but I have yet to find one that holds well.
If you built the high performance tractors, put the pipe insulation on now. Slide the insulation until it completely covers the tractor Fig 9. Make sure to leave 2-3" of
foam at the cap end of each tractor to act as a shock absorber.
Image Notes
1. Knot 54 lands at 162"
2. Cut here, in between knots 54 and 55.
http://www.instructables.com/id/Build-A-Net-Gun/
Image Notes
1. Severed between knot 54 and 55.