This is one of the subjects I used to teach when I trained recruits. Yes the proper term is Pierced Steel Planking (note that in the pics the planks are upside down). They actually come in 10' and 5' lengths and the joints are staggered. You would start to lay the first row with a 10' length and start the next row with a 5'. You can see how the individual planks clip together, they were locked in position by spring clips, 3 per 10'plank, either end and the middle.
I have also played with the AM2 matting, in fact Stanley Airfield (Port Stanley Falkland Ilands) was extended using this equipment. It gradually shifted as the Hercs landed, so every so often the airfield was closed and we had to lift and re-lay it, in 12 hours, that was always something to look foeward to
Chip.
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Would it be possible to make my own PSP
The only efective scale way of producing PSP would be photo etching and that is expensive to buy. I would replicate SMT (Square Mesh Track), which is far simpler and was used for the same purpose. It was basically sheets of 3" square wire mesh (about 10 gauge) about 10' wide. Layed out and anchored with 2' long angle iron stakes, with bent over heads, along the edges and joins. Joints overlapped about 3'.
Another, is Somerfield Trackway, this came in rolls and was like chicken wire (only bigger holes) with anchour bars woven in. These bars had loops formed in the ends through which flat tie bars went. Matts could be linked side by side and overlapped end to end to form as big an area as you liked. Anchour pins, similar to those used on SMT were positioned along the tie bars, tensioning as well as anchouring.
The thing is with all these surfacing mediums (except the AM2) grass would grow up through them and, in the case of SMT and Somerfield trackway, mostly hide it. With PSP grass will grow through the holes and to some degree through the gaps at the joints.
Mal