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Flint:
I don't think there would be a really good general rule other than transposing like I did. The variability of the landing surface as compared to pavement is so great that a general rule just would not work like it does for paved runways. My experience has been mainly in Super Cubs and I would say that about 80% of the time, I can land and takeoff in less distance than what would be predicted by transposing the Cessna rule and applying it to Super Cub values. The other 20% of the time I will exceed those distances because of very uneven surfaces and/or approach/departure paths (ok, so I blew a few too). Now I am no where near an expert on off field/unimproved field work, so someone with more experience and skill than me could probably do much better.
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