Nr at Touchdown
Brian, based upon doing this in the S-61, S-67, S-70 and S-92, touchdown Nr ought to be in the low 90's to mid-80s ( percent ). It will decay to lower than that of course after the touchdown. Lift is a V-squared function, and if one uses up the energy too early ( too high ), and lands at 70%, the resultant landing will be harder.
Thanks,
John Dixson