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What is the stall speed of a helicopter?
Retreating blade stall is one of the primary limiting factors in a helicopter’s airspeed, and the reason even the fastest helicopters can only fly slightly faster than 200 knots (about 370 km/h) though various changes can be made to conventional helicopters to try to overcome this limit such as streamlining, lifting …
Can helicopters dive?
Basically, you buckle up in a helicopter with your scuba gear almost entirely set up and on you. The fins and the snorkel mask are attached to your chest. Then, at a height of about 15 feet in the air, the helicopter drops you into the blue. Once in the water, the dive unfolds normally.
When does a rotor stall in a helicopter?
Just as in an airplane, the wing or main rotor blade will stall if it gets slow enough and the angle of attack is exceeded. That’s the primary value in determining a helicopter’s V NE. Any faster and the retreating blade will stall. Assuming the pilot stays below V NE, retreating blade stalls are easy to avoid.
What causes a helicopter to stall at low altitude?
Retreating blade stall often sets the Vne for helicopters and you can see this often where the helicopter VNE decreases as the density altitude increases. Low frequency vibrations from the unstable airflow over the retreating blade are often a warning that retreating blade stall is not far away.
What makes a helicopter situation so difficult to deal with?
What makes the helicopter situation so difficult is that rotor rpm is directly tied to power. Whereas in an airplane you simply avoid or break the stall with nose attitude, in a helicopter the situation is still tenuous even after lowering the angle of attack. This gets really confusing.
What makes an aircraft more susceptible to stall?
There are other factors that can make the retreating blade more susceptible to stall. If the aircraft is heavy then more blade pitch and hence AOA is required to lift the heavier aircraft and so a heavy aircraft will more susceptible to retreating blade stall.