2 rotors

[warthogmadman987]

why does the ka50 have 2 rotors, does it make it faster, or more handeling, more lift, or what?

[Guest beatnoir]

It does not have a tail rotor. Instead, to over come the torque (horizontal spinning), each rotor spins opposite the other. The rutter control works by speeding up one while slowing down the other.

[britgliderpilot]

why does the ka50 have 2 rotors, does it make it faster, or more handeling, more lift, or what?

 

Because it's the way Kamov do things ;)

 

 

From the Kamov website, no less:

 

 

The prevailing technology used in helicopter design is the single-rotor scheme assisted by tail rotor. However, thorough investigations in the sphere of modern helicopter design prove the necessity to eliminate a tail rotor as tail rotor mountings are inherently disadvantageous due to the following:

 

 

high probability of personnel injury at maintenance and in combat operations,

 

 

power losses at torque transmission to tail rotor,

 

 

increased number of critical units and correspondingly increased maintenance.

 

Fenestron-type and NOTAR structures (control by air stream blowing through tail boom) partially help to avoid the above-mentioned disadvantages. The coaxial rotor scheme eliminates a tail rotor and correspondingly it negates all the disadvantages of single-rotor scheme. Besides, coaxial rotor helicopters are distinct for:

 

 

 

increased thrust margin of main rotors vs. single-rotor helicopters,

high rate of climb,

absence of cross-couplings in helicopter control,

small dimensions,

low vibrations.

 

 

These features provide coaxial helicopters with unique maneuverability and easy controllability that are of paramount importance while piloting the helicopter in ground vicinity and restricted area conditions. The helicopter can land at and take off from unprepared surfaces as well as from surfaces covered with low bushes. Absence of tail rotor reduces maintenance costs. Control peculiarities of co-axial helicopters allow for quick mastering of helicopter piloting techniques by crewmembers as well as ensure safety training even to beginners.

 

 

Collision of coaxial helicopter rotors is no more probable than collision of single rotor blades with tail boom. Safe distance between rotors is determined on basis of special methods, calculations, researches and flight tests. At rotor starting and stopping in stormy conditions, rotor collision is prevented by centrifugal flap stops at lower rotor and droop stops at upper rotor. Safety of coaxial rotor scheme is proved by abundant operation experience of Kamov helicopters.

 

KAMOV Company has been designing and manufacturing coaxial helicopter for more than 50 years and has practically polished to perfection the rotor system design.

 

I reckon that answers the question pretty comprehensively ;)

[Pilotasso]

aditionaly, in order to hit the weakest point of the rotor you require do pierce through the whole airframe from most angles.