I believe 1 1/4 was right around where I was.
From what I found with all of my experiments is that soil conditions dictate how much you need. If you go too heavy-duty and too deep you have problems getting them out in hard soil.
The sofer it is, the deeper you need to go and/or the larger the anchor.
So like anything else, you gotta play with it for your circumstances.
If you decide to try it please share with us what you do and find!
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