Yet another pier thread. How deep for a CGEM?

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I want to build a permanent pier for my CGEM. It will need to cope with the weight of a Meade 12inch ACF :)

How deep and wide a hole do I need? I was going to use a star post hammered into the centre of the dug hole, and then a PVC piping around he post to hold some concrete.

Edit: This is the sort of thing I was considering:

http://www.skyatnightmagazine.com/feature/how-guide/how-tobuild-back-garden-telescope-pier

[bojan]

What an interesting design!
I did something similar recently, see here:
http://www.iceinspace.com.au/forum/showthread.php?t=84067&highlight=pier
The hole for the concrete slab was 75cm deep, 35cm in diameter (I used 6 bags of concrete premix from Bunnings) and its pretty much OK.. maybe you do it a bit stronger (deeper, wider)

[mswhin63]

These small pier design are quite a good idea, I also have a similar system i want to create for my TS80 and EQ5 but have a few more designs aspect to implement.