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Jerry's addition of 50% to ground roll is sometimes not enough.
When this city boy decided he wanted to do some mountain flying, he took his then-1969 337D from Miami, across the Rockies, to my final destination of Garden Valley, Idaho (where my son is a heliattack forest fireman). Grass, 3850 foot runway, 3200 feet altitude. Surrounded by taller peaks, so the glide is steep.
I had landed in Boise the night before and was anxious to get there, so I was approaching the field at about 9 AM. Didn't think of dew on the grass. Well, it took all of those 3850 feet to stop the aircraft. Bottom line: consider all the factors, not just whether the runway is paved.
Ernie
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