OK thanks for that, it starts to make sense, but for my simple mind it seems I have around 9 tonnes of energy striking a hard log but a lot less on a soft log as the energy is absorbed by the penetration! have I got that right.
And Mac Ouch  Rick
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Ex banger racer now off road maniac 
Lokka on the front with manual hubs
Diff lock on rear
3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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