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Old 05-20-11, 04:18 PM   #6
S-F
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Join Date: Nov 2009
Location: Northampton MA
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Where I live we have an abundance of rock. In fact it some times seems like we don't really have any soil, just rock all the way down. I'm thinking that if you are either in a location such as I am or if you strike rock in you drilling you won't make it with 2.5 HP, with any torque. In the heat pump manifesto a fellow named Vlad I believe made some giant rig that was gas powered and he was using tri cone bits. As I recall he even had trouble getting down too deep and decided to only dig to 70'. He never explained why this is as far as I recall.
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