Just watching the logging boys yarding 10,000-20,000lbs of logs off a cut block 2000ft above a water drop.... They can go really fast.....
All kinds of loads will fly at a higher speed than 80kts, as will an empty long line. Just make sure the line is long enough, and with a heavy enough hook on it. Also be really careful slowing down with rear cyclic input in a decent, other than that, you should be just fine.
RH