The size and shape define what the rotor will lift.
the blade is called rotor bladesThe rotor blades on top are called Main Rotor Blades, because they are the main source of lift for the helicopter. The smaller rotor blades on the tail are called Tail Rotor Blades.
The helicopter main rotor blades have an airfoil shape like an airplanes wing. The entire blade can also be angled by the pilot,through the rotor head. This angle makes it fly or lift.
The blades on a helicopter are called rotor blades. They are attached to the rotor mast and rotate to provide lift and control for the helicopter.
The rotor hub holds blades on
The rotor head changes the angle of incidence of the rotor blades as they rotate.
No, they are correctly called 'rotor blades'
The number of blades required is proportional to the amount of lift required. There are several factors that affect the amount of lift produced by rotor blades. They are the shape of the air foil, the rotational speed, the angle of attack, the length of the rotor blades, and the strength of the blades. All of these have practical limits. Adding an additional blade helps keep all these parameters within practical limits.
Rotor blades
I can't answer what the record number of main rotor blades is but these three helicopters are the some of the largest helo's in the world and the last has 10 main rotor blades although it has no tail rotor so it depends on your definition of main rotor I guess.Sikorsky S-64 Sky crane - Has 7 main rotor bladesMil Mi-26 - Has 8 main rotor bladesMil Mi-12 - Has 10 main rotor blades - was only really a prototype.
Rotor blades are on helicopters. They are the long narrow parts above the fuselage (cabin) .When these rotate they impart 'lift' to the helicopter.
it is the mechanism above the transmission that is hooked up to the rotor blades