Risk factors. Factors that increase the risk of stuttering include: 1  Having relatives who stutter. 2  Stuttering tends to run in families. 3  Delayed childhood development. 4  Children who have developmental delays or other speech problems may be more likely to stutter. 5  Being male. 6  Males are much more likely to stutter than females are. 7  Stress.
The average speed for a four-seat helicopter is 130 to 145 miles per hour. Because smaller helicopters have smaller engines, the average speed for a two-seat is 90 to 105 mph. The fastest helicopter on Earth as of 2014, the X3 Eurocopter, can fly at 300 mph. Keep Learning.
For an H-60, max range airspeed at sea level is about 125 knots. With a full tank (~4000 lbs of fuel), that winds up being in the ballpark of 400 nm range. Keep in mind that for a helicopter, max range and max endurance airspeeds are often quite different. Again for an H-60, flying 55 knots or so will let you squeeze a lot more time out of a given fuel load (though not getting as far as if you flew faster but for less time).