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1. Pressure chamber section.<br />
2. Trigger valve section.<br />
3. Launcher section.<br />
Image Notes<br />
1. 1" orbit 57461 sprinkler valve. This was a model downloaded from the google<br />
3-d library, it doesn't look exactly like the valve.<br />
2. Blow gun.<br />
3. 1/4" NPT male to male coupler.<br />
Step 2: <strong>Net</strong> Procurement And Math<br />
http://www.instructables.<strong>com</strong>/id/<strong>Build</strong>-A-<strong>Net</strong>-<strong>Gun</strong>/<br />
1. 2" cap with tire valve inserted.<br />
2. 9" length of 2" PVC pipe.<br />
3. 2" coupler with 2" to 1" bushing in one end, shown with optional pressure<br />
gauge.<br />
4. 1" slip elbow.<br />
5. Length of 1" pipe functions as the pistol grip area. Dry fit until you arrive at a<br />
length that you find suitable. Somewhere between 3" and 6" should be sufficient.<br />
6. 1" slip to 1" MPT elbow.<br />
Image Notes<br />
1. <strong>Net</strong> holder<br />
2. Launcher arms, tractors slide over and onto these.<br />
3. Threads into trigger valve.<br />
I ordered my net from the Memphis <strong>Net</strong> & Twine Company. If you have your own favorite gill net vendor, you can probably order an identical item from them. I have NO<br />
financial ties to MN&T other than being a satisfied purchaser of their retail products.<br />
Here is the link to the product page on the MN&T website. Below is the exact info from my order information page, shipping is not included in the price. One pound of this<br />
net (minimum order) will make 7 or possibly 8, 9-1/2 foot square nets.<br />
Sku: 263<br />
Description: 3 in. sq. mesh, 12 ft. deep<br />
Qty: 1lb<br />
Price: $12.65<br />
If you would like to try an alternate net part number please read the Alternate <strong>Net</strong> Substitution section below.<br />
Optional <strong>Net</strong> Math Section<br />
You may have noticed that the catalog description lists the net as 12 feet deep while I have claimed it is 9-1/2 feet square, why the difference? Let us first deal with a<br />
hypothetical net that has 3" mesh and is 3 meshes deep. You might think 3 x 3 equals a 9 inch deep net, but that would be incorrect. Visualize the meshes as diamonds<br />
stacked point to point and NOT squares stacked like bricks. Reference Fig 1 and it be<strong>com</strong>es apparent that the depth of our hypothetical net is nearly 12-3/4 inches. To<br />
extend this example to MN&T sku# 263, 27 x 4.24 equals 114.48 inches, divide by 12 and we get 9.55 feet deep. So where does MN&T get the 12 foot depth figure?<br />
They are building a certain amount of droop, when used in a fishing application the diamonds will be longer vertically than they are wide.<br />
I have included a spreadsheet that will allow you to enter different figures to see what size net you will end up with, and how many nets you will get from a pound of that<br />
particular net. If the spreadsheet returns a zero for waste material, you may want to subtract one net from the total expected. The default numbers in the spreadsheet are<br />
for MN&T sku# 263 272.<br />
Alternate <strong>Net</strong> Substitution<br />
I will use MN&T catalog and part numbers in this example, but as long as you know the correct variables, any net vendor should work. Using the spreadsheet is<br />
important, if you don't own MS excel, consider downloading OpenOffice. An excellent free MS office replacement that will allow you to view and edit the <strong>Net</strong> Math<br />
spreadsheet.<br />
Please consult Fig 2 or have the spreadsheet open for this example. The top section of the spreadsheet contains a section called Mesh Count Estimator. This will help<br />
you calculate the mesh count you need to reach a desired net size. In this example I have entered 3.5 (3-1/2" mesh) in the Mesh size cell and 9.5 in the Desired depth<br />
cell. This should closely match the sku #263 net's overall size but with a 3-1/2" mesh instead of 3". The <strong>com</strong>puted result, 23.03 appears in the mesh count cell. As<br />
fractional net meshes don't exist, just round to the closest integer, 23 in this case. Next, we will browse through the MN&T catalog for a 3-1/2" mesh net 23 meshes<br />
deep.<br />
Go to the multifilament net section of the MN&T web catalog, then select #208 twine size and browse through the 3-1/2" mesh part numbers to find a net closest to the 23<br />
mesh count. Part number 272 fits our specification perfectly.
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