It is still just a helicopter regardless of number of blades.
The concept of "better" does not work into it. Each rotor is designed for a particular purpose, for that particular helicopter. Sometimes the best solution is a two bladed prop. sometimes three, sometimes four, all depending on a wide variety of parameters. It's is analogous to knives. A table knife is designed for certain purposes. A hunting knife is designed for certain purposes. Both work perfectly for the purposes they were designed for, but they are hardly interchangeable, and one is not "better" than the other.
Two-bladed ax, usually called a labrys.
That is a twin rotoe helicopter
1957 by Boelkow called the Bo-102. It had a single bladed main rotor and a single bladed tail rotor. For more go to http://www.aviastar.org/helicopters_eng/bo-102.php in 1957 by Boelkow called the Bo-102 it had a single main and tail rotor. For more go here http://www.aviastar.org/helicopters_eng/bo-102.php
The first helicopter was called the VS-300.
A two-tipped spear is called a double-headed spear or a double-bladed spear. It is designed with a blade at both ends for increased versatility and effectiveness in combat.
It's the President's helicopter, and it's called Marine 1.
not sure what electrical system we are talking about. In-line, regular sized two bladed, mini two bladed type, and a 50AMP sheet of metal type I have seen on a Rabbit diesel
It actually has two names (A) Tail Rotor (B) Antitorque Rotor.
It is called the rotor.
The two FBI agents fell out of a helicopter due to a mechanical failure that caused the helicopter's door to open unexpectedly.
The Renaissance fencing sword was a narrowed bladed sword called a 'Rapier'.