Friday, September 6, 2013

Post 11: Large Scale Water Projection

   Another thing I have been working on is a larger spraying frame for next years water projection. I would like to use a 5K projector, which should be able to cover an area about 10 ft x 18 ft. I also want the frame to be free standing, more rigid, and vertical so it can be seen from the distance.
   I am using as a base a 10 ft PVC 1" pipe with two horizontal T's and four 2ft flat "legs":



    Three of the ends are capped, the fourth is fitted with a garden hose connector. The two vertical T's are fitted with 3/4" PVC pipe with a slip connector so the direction of the spray can be adjusted:


   The nozzles are 90 degree fan screwed into holes drilled 18 to 24" apart in the side of the PVC pipes and tapped 8-32:



    Two 1/2" beige 10 ft PVC pipes are screweed at the top of the 3/4" vertical pipes, curved inward to meet at the top of the arch and are connected with a slip joint.
   I set up the sprayer for a test in my back patio. It is actually more flimsy than I expected once put together because of the height,  and will require some kind of metal support to be solid enough to stand in the middle of the street. In the meantime, I supported it with a few sticks tying it to the house. It ended up 10 ft wide and almost 18 ft tall:




    I tested the spray, and it seems OK, but I won't be able to tell till I test it tonight. The light wall and the door right behind are going to interfere with the projection,  so I need to get a black drop cloth to hang on the wall. 
    Well, even with the black drop cloth behind, it didn't work at all...I could see a dim image on the black backdrop, but couldn't get the water spray to catch it. Bummer... I suppose I need to project from the back side, with empty space behind and in front. I will set up the sprayer in another spot where I can test that Monday.

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