I did some flight testing a number of years ago in a Bell 206B and Bell LongRanger, where tail rotor effect had to be evaluated before and after an external camera installation. I set up a test along an abandoned dirt road I could fly down, and flew progressively more slowly, without touching the tail rotor pedals. In both cases, I was able to fly down to 22 knots with only the vertical stabilizer holding against the torque. Below 22 knots, it suddenly swung, and a prompt application of pedal was required. Happily, pre and post mod were the same, so test element passed. Most helicopters I have flown will cruise quite happily, with only a touch, if any pedal applied.