So... The answer according to the equations in the paper is 31 ft!
I went ahead and worked it out all the way just in case anyone cares to fiddle with any other numbers. Just plug in initialballspeed (ft/s), grade (positive = uphill, negative = downhill), and stimp. If you get negative values for distance, that means your ball rolls away forever...
For reference, a stimpmeter rolls a ball at 6 ft/s.
Originally Posted by MS256
The question I am curious about is how much slope and how fast a green has to be for it to be impossible for a ball in motion to stop. At some point in slope and surface a ball in motion is going to pick up speed instead of slowing down (until it is stopped by the slope ending or the surface changing enough to stop it). I just don't know where that point is (but I would guess that 12 on the stimp and 4% slope has to be getting close to that point).
So all we have to do is try to get our distance to go to infinity in the equation above. We do that by forcing the denominator to equal zero, and we get this:
Originally Posted by iacas
Greens don't all roll off at 4%. Roll off at stimp 12 is about 6%. At 7 it's about 10%.
Erik's numbers are pretty dang close to what the equation says.
Ok, that's enough math for awhile. Back to golf...