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There really isn't a "better" - they have different uses and roles. Both are very useful in their role
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∙ 8y ago
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How many people can fit in anApache helicopter?
The AH-64 Apache is a 4-blade, twin-engine is an attack military helicopter with a tailwheel-type landing gear arrangement, and a tandem cockpit for a two-man crew.
Why is 2 propellers better than 3 propellers?
How do you mean that it is better? Each propellor is selected to produce the thrust based on the RPM and Torque output of the engine. A 3 blade propell will produce more thrust than a 2 blade in most general cases. Or another way to say it is that the 3 blade propellor can turn slower than a 2 blade to produce the same amount of thrust. Also, the 2 blade propellor is easier to design and build. My experience is with Helicoper rotor blades. The earlier Bell Helicopter designs were almost entirely 2-blade "teetor rotor" design. This was much easier to design the blade attachment, i.e. the rotor grip and trunnion mount, etc. Whereas Sikorski Helicopters preferred multi-blade designs and usually odd number: 3 or 5. The multiblade design requires more precise engineering. The multiblade for helicopters have to be designed to allow movement of the blade in all 3 axis and must have a dampener for each axis. This dampener can be a rubber absorber but they usually require a hydraulic shock absorber in the axis of rotation. The point being is that it is more complicated than a 2 blade design. A 2-blade helicopter blade doesn't have dampeners because of the special requirements of helicopter designs. Therefore the 2-blade propellor IS better because it is cheaper. If you mean two props (like, say, a DC-3 or a King Air) instead of three props (like a Ford Trimotor)... two props means two engines. It means 33 percent less maintenance, because it's easier to work on two engines than three. It means if someone gets stupid and noses-over the airplane on landing you have fuselage repairs to accomplish and NOT the replacement of an engine and a prop. It means you save the weight of an engine, so your payload can be higher. It also means the pilot isn't looking through a propeller.
How does a helicopter stay in the air?
The source of lift force from the rotor (Rotation of two objects 'blade' creates a lifting force) blades allows the helicopter to stay in one area for extended periods of time. Each rotor blade, whether it is 2 or 7, has the ability to change pitch. This means the blade can rotate so that the nose or leading edge can tilt down or up. If it pitches up, the lift of the blade increases. Collective Controls As the blades rotate it produces lift. The pilot inputs controls that increases the pitch on all the blades at once. All the blades pitch up and produce more lift, so the helicopter rises. Cyclic Controls The pitch of the blades can also be controlled so that the blade pitches UP when it is on one side of the helicopter and pitches DOWN when it is on the other side. As the advancing blade is moving from rear to front, it decreases it Lift. Then as the blade moves to other side, it increases its Lift and pushes the helo through the air. In a simply explanation, this is what causes the helicopter to fly forward. Think of it like someone paddling a canoe. On many helicopters, the input is accomplished through the controls of the Swashplate. Custermen - Worked 11 years at Bell Helicopter.
What is a helicopter with two sets of blades called?
That is a twin rotoe helicopter
Why do helicopters fly so slow?
What is the limiting factor for helicopter speed you ask? What happens to the rotor as the velocity of the helicopter increases? The relative speed of the tips of the rotors changes because of the wind speed. On the advancing side of the rotor the speed increases by the speed of the helicopter. On the retreating side of the rotor the speed decreases by the speed of the rotor. One of two things happens as the helicopter reaches a high speed: A: If it is a large rotor, the advancing blade will reach the sound barrier and sap energy from the rotor, slowing it. Significant damage may occur to the helicopter. B: If it is a smaller rotor, the retreating blade will slow to the point where stall occurs, and the helicopter will be forced into a turn while losing altitude and decreasing speed, then it will usually recover if altitude permits. Option B can be mitigated by increasing rotor RPM at higher speeds. In this case the rotor speed becomes the limiting factor, as the centrifugal forces at the root of the blade are quite incredible. Carter
Is a four bladed helicopter better than a two bladed helicopter?
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.
What is a two bladed helicopter called?
It is still just a helicopter regardless of number of blades.
How many seats does a helicopter have?
Two
What puts out more air- a two blade fan or a four blade fan?
four blade
When was Blade-dance of the Two Lovers created?
Blade-dance of the Two Lovers was created in 1961.
Another name for helicopter propelers?
Main rotor and tail rotor. The main rotor is on top of the helicopter consisting of two or more blades, and the tail rotor is at the back of the helicopter, which also consists of two or more blades.
What is the two simple machines in a can openner?
A wedge(the blade) and a gear ( what turns the blade)
