There are some really nice pads in this thread! Here is my addition:
This is my HPR, large rocket pad. No welding, no muss or fuss. Assembles with a hack-saw, power drill with 1/4" bit, 7/16" wrench, allen wrench, vise, and a little muscle power. Assembled with 1/4"-20 nuts and bolts, aluminum angle and square tube, 22 gauge steel plate, 1/4" fender washers and shaft collars, 4' 1/4" rod, all bought from TSC. The rod is coated with graphite spray on dry lubricant, also helps prevent rust. The rod can also be replaced with a 3/16" rod using the same hardware. Paint the blast deflector with stove paint before you launch a rocket, I didn't and the residue corroded the plate. The pad is quite durable, as it is aluminum it wont normally corrode. Exhaust residue might corrode the aluminum though. Unfortunately I have only used it a couple of times.
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Detail of the back assembly:
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Blast plate:
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Folds down either way, forward only until the blast plate contacts the leg, backwards 180+ degrees.
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My modified (And unflown) Vagabond and a CTI 3g case for perspective.
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Folds up for storage or transport and even disassembles into two parts.
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This is the blast plate for my LPR pad, your run of the mill Estes pad, plaster of paris poured into a disposable desert plate. I did this on the spur of the moment using leftover plaster and decided to drill a hole in it. It works great, much better than the metal Estes deflectors. It does like to erode and shower sparks all over the place, though they disappear so fast you don't even see them. So far it has held up to many LPR launches.
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