I built a set years ago using an AC compressor to supply air to pressurize the suds solution in a surplus beer keg and to supply air to the foam units at the end of the boom.
The foam units are simple a piece of plastic pipe with plastic pot scrubbers stuffed in.
I used 4 surplus 12 Volt solenoid valves, 2 for each boom, one for air, one for suds mix. A couple of brass needle valves control the air flow and the suds solution flow.
The air and the suds mix meet in a little plastic "TEE" just before each of the foam units.
Darned thin worked pretty good. I haven't used it since I quit farming in '97, but still have the sprayer stored away.
Could snap a couple of photos in the next several days, if you'd like.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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