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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.
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Are helicopters more used than planes?
No, there are many more planes flying for longer periods than helicopters.
Are Helicopters safer than planes?
Helicopters are generally more dangerous than aeroplanes.
What do helicopters do to the environment?
Answer Nothing more than any other type of airplane or car. Most helicopters are powered by jet engines that use a gearbox to power the rotor blades. The turbine jet engines are relatively evironmentally friendly compared to other internal combustion engines.
What are some advantages of helicopters rather than airplanes?
Helicopters can land where airplanes cannot.
Do helicopters crash more often than airplanes?
no
How fast can a helicopters go?
Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.
How were helicopters like in the 1800s?
There were helicopters in the good old days. They were more advanced than what we have today, they were 10x bigger they had about 200 seats
Why do some helicopters have different numbers of blades?
If you mean rotor blades, theoretically, only one (provided it is counterbalanced and moves fast enough). But you'll typically see two or more. Helicopters use more than one because it requires less rotor speed to get the same lift, and it also runs a lower risk of failure in the mechanical systems. Many rotocraft use four or five, and some up to six or seven blades. There are a few helicopters that use two main rotors, and they are counter rotating so that their torque cancels and a tail rotor is not necessary. But the mechanical complexity of these main rotor systems impinges on mechanical reliability.
How many people have been saved by helicopters?
In 2009 more than 2100 people!
What helicopters can you fly at any age?
Only RC Helicopters can be flown at small age. That too is restricted to about 8 years. Real helicopters should only be flown by licensed pilots of age more than 18.
When did people start using helicopters?
Soon after WW2 helicopters became very popular, reaching a peak of use in the Vietnam war, when the US Army and Marines had more helicopters than all the services regular airplanes
How many fighter jets does Russia have?
Around 3000-6000 they have more helicopters than jets
