The airsoft land mine that I bought was a pitiful waste of $50. The self proclaimed "loud boom followed by a large blast of powder" was a tiny pop and half inch high puff. Enemies didn't even notice that they triggered it. Frustrated, I built a better, more powerful mine. It's easy to replicate and simple to use. It shoots BBs twenty-eight (28) feet and powder six (6).
Step 1: Materials.
This project is fairly inexpensive, depending on the materials you already have. I only had to buy the springs.
You will need:
- 1 inch diameter pipe.
- 3/4 inch diameter wooden dowel.
- 3/4 inch diameter washer.
- 3/4 inch diameter spring (ID # C-756).
- Screws, 1/4 inch diameter.
- Fishing line.
- Smaller dowel.
- Small metal dowel.
- Suitable safety pin wire.
Step 2: Cut to Length.
Cut your pipe to lengths of 61/4 inches, or about 21/2 inches longer than your spring. Cut your 3/4 inch diameter wooden dowel into 3/4 inch length plugs. You will use two of these plugs.
Step 3: Build the Mechanism.
This is the heart of the trip mine. The device acts like a piston, the spring is compressed and held in place by the pin. When released it springs back, inertia causing the contents to fly out.
First you need to drill a 1/8 inch guide hole through the center of both your plugs. Use a clamp to hold the plug in place. Now for the tricky part. Place your 3/4 inch washer over the base of your spring and line it up with the plug, try to make it as flush as possible. Tightly screw the washer and spring in place, you can do this through the side of the spring. Repeat this for both ends of your spring.