Sunday, Dec 22, 2013 at 23:57
It's interesting that this plate (or planking), was consistently referred to by the American military in WW2 as "steel landing mats" - as that was their primary designed use.
They were inducted into use as bog mats as an afterthought, from what I can see.
The planks were more commonly called Marsden Matting, it was known in official U.S. Army parlance as PSP (Perforated or Pierced Steel Planking).
During WW2, there were actually 5 types of American "steel landing mats".
These were; PSP, Light bar-and-rod, Heavy bar-and-rod, Irving
Grid, and Sommerfield.
The Irving
grid was a plate with a criss-cross pattern - and the Sommerfield was just like a heavy netting, reinforced with short longitudinal steel bars, that could be rolled up.
WW2 Marsden Matting was fairly readily available in the 1950's and 1960's and started to become scarcer in the 1970's.
It's strong stuff, but too heavy to carry around on a light vehicle. It was designed to be laid and to stay laid, as aircraft support areas and runways - not as a portable bog mat.
For this reason, PSP was constructed with bayonet hooks at 90 degrees along its edges, which were slid into corresponding holes in the adjoining plate, thus interlocking the plates.
The plates were then locked completely together with a spring clip.
Many a
farm or station still has WW2 Marsden matting in use as stockyard panels.
Over 2M tons of PSP was produced by the Americans during WW2.
Some was also produced in aluminium, for ease of air transport. It was then called PAP.
I don't think it was a large quantity, because aluminium was in high demand for aircraft construction during WW2. I've never seen any in aluminium.
Here's a photo from the U.S. War Dept, Aviation Engineers Technical Manual, showing the 5 different types of landing mats.
http://oi42.tinypic.com/16k8844.jpg
Cheers, Ron.
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