How to helicopter propellers work?

Question

need this info for homework, i really did try and do it but i cant, i really need to know how

Answer 1

The Main rotor blades of a helicopter are basically airfoils that are kept in constant motion by rotating around a central shaft. Like wings on an airplane they use Bernoulli's principle to generate lift. The upper surface of a helicopter blade is curved while the lower surface is flat. This means air has a longer distance to travel when it flows over the top of the blede. since the air has longer to travel over the blade than under it, air generally moves faster whem it's pushed over the top of the blade. this creates a low pressure area on top of the blade , which generates lift ( high pressure on bottom of blade tries to move to low pressure on top of blade). Use a search engine to look up Bernoulli's Principle, and it's application on rotary winged aircraft. That'll probably help you out alot.

Answer 2

Helicopters have rotors.  Fixed Wing Aircraft have propellers, helicopters are considered Rotary WIng Aircraft.  The engine turns the rotor through a series of gear boxes at somewhere around 1000 revolutions per minute creating lift as they change the pitch of the blade.

Answer 3

Helicopters don't have propellers, they have rotors.

Answer 4

This website has alot of info. Good luck

http://travel.howstuffworks.com/helicopt...