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Thanks Rick - for the reply and the pics. I've never questioned the conventional wisdom about deep holes, cement and so forth for anchoring a pier. I have three of these blighters in my current obs and they are mighty beasts to say the least. But the move to this new place has made me question that conventional wisdom a little and to ask whether a sufficiently thick - 100-150mm pad alone would suffice. I am dealing with sandy soil (Bribie Island). In my present plan, the slab would be triangular - an equilateral triangle with each side a bit longer than the span of the tripod legs at full extension. So it would pretty darned solid. One apex of the triangle would be aligned as near as possible to true south using a string line and the other two apexes (is that the right plural?) accordingly.
Peter
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